THS7375

TH
S73
THS7375
75
www.ti.com
SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
4-Channel SDTV Video Amplifier with 6th-Order Filters and 5.6-V/V Gain
Check for Samples: THS7375
FEATURES
DESCRIPTION
•
Fabricated using the revolutionary complementary
Silicon-Germanium (SiGe) BiCom3X process, the
THS7375 is a low-power, single-supply, 3 V to 5 V
four-channel integrated video buffer. It incorporates a
sixth-order Butterworth filter (able to be bypassed)
that is useful as a digital-to-analog converter (DAC)
reconstruction filter or an analog-to-digital converter
(ADC) anti-aliasing filter. The 9.5-MHz filter is a
perfect choice for SDTV video that includes
composite (CVBS), S-video, Y'U'V', G'B'R' (R'G'B'),
Y'P'BP'R 480i/576i, and SCART systems.
1
23
•
•
•
•
•
•
•
•
Four SDTV Video Amplifiers for CVBS,
S-Video, Y'P'BP'R 480i/576i, Y'U'V', G'B'R'
(R'G'B'), or SCART
Integrated Low-Pass Filters:
– Sixth-Order 9.5-MHz (–3dB) Butterworth
– –0.1-dB Bandwidth at 6 MHz
– –1-dB Passband Bandwidth at 8 MHz
– 54-dB Attenuation at 27 MHz
Versatile Input Biasing
– DC-Coupled with 320-mV Output Shift
– AC-Coupled with Sync-Tip Clamp
– AC-Coupled with Biasing Allowed
Built-in 5.6-V/V Gain (14.95 dB)
+3-V to +5-V Single-Supply Operation
Rail-to-Rail Output:
– Output Swings Within 100 mV from the
Rails to Allow AC or DC Output Coupling
– Supports Driving Two Lines per Channel
Low 9.8-mA at 3.3-V Total Quiescent Current
Low Differential Gain/Phase of 0.2%/0.35°
Lead-Free and Green TSSOP-14 Package
As part of the THS7375 flexibility, the input can be
configured for either ac or dc-coupled inputs. The
320-mV output level shift allows for a full sync
dynamic range at the output with 0-V input. The
ac-coupled modes include a transparent sync-tip
clamp option for CVBS, Y', and G'B'R' signals with
sync. AC-coupled biasing for C'/P'B/P'R channels can
easily be achieved by adding an external resistor to
VS+.
The THS7375 is the perfect choice for all video buffer
applications. Its rail-to-rail output stage with 5.6-V/V
gain allows for both ac and dc line driving. This
architecture makes the THS7375 an ideal choice for
DaVinci™ processors. The ability to drive two lines
per channel, or 75-Ω loads, allows for maximum
flexibility as a video line driver. The 9.8-mA total
quiescent current at 3.3 V and 0.1-mA disabled
current makes it an excellent choice for
USB-powered, portable, or other power-sensitive
applications.
APPLICATIONS
•
•
•
•
Set Top Box Output Video Buffering
Portable Media Player Video Buffering
Security/Surveillance Systems
DaVinci/OMAP/DMxxx Video Buffering
The THS7375 is available in a TSSOP-14 package
that is lead-free and green (RoHS) compliant.
+1.8 V
THS7375
CVBS
R
CH1 IN
CH1 OUT 14
2
CH2 IN
CH2 OUT 13
3
CH3 IN
CH3 OUT 12
4
CH4 IN
CH4 OUT 11
5
GND
6
DISABLE
7
NC
75 W
Y'/G' Out
75 W
Y'/G'
R
DaVinci
DMxxxx
CVBS/Sync
75 W
1
P’B/B'
75 W
VS+ 10
BYPASS
9
NC
8
P'B/B' Out
75 W
R
75 W
P'R/R' Out
P’R/R'
R
75 W
To GPIO Controller
or GND
75 W
+3 V to +5 V
Figure 1. 3.3-V Single-Supply, DC-Input/DC-Output Coupled Video Line Driver
1
2
3
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DaVinci is a trademark of Texas Instruments Incorporated.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2011, Texas Instruments Incorporated
THS7375
SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE/ORDERING INFORMATION (1)
PRODUCT
PACKAGE-LEAD
THS7375IPW
(2)
Rails, 90
TSSOP-14
THS7375IPWR
(1)
TRANSPORT MEDIA, QUANTITY
Tape and Reel, 2000
ECO STATUS (2)
Pb-Free, Green
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or visit the
device product folder at www.ti.com.
These packages conform to Lead (Pb)-free and green manufacturing specifications. Additional details including specific material
contentcan be accessed at www.ti.com/leadfree.
GREEN: TI defines Green to mean Lead (Pb)-Free and in addition, uses less package materials that do not contain halogens, including
bromine (Br), or antimony (Sb) above 0.1% of total product weight. N/A: Not yet available Lead (Pb)-Free; for estimated conversion
dates, go to www.ti.com/leadfree. Pb-FREE: TI defines Lead (Pb)-Free to mean RoHS compatible, including a lead concentration that
does not exceed 0.1% of total product weight, and, if designed to be soldered, suitable for use in specified lead-free soldering
processes.
ABSOLUTE MAXIMUM RATINGS (1)
Over operating free-air temperature range unless otherwise noted.
Supply voltage, VS+ to GND
Input voltage, VI
Output current, IO
Continuous power dissipation
Maximum junction temperature, continuous operation, long-term reliability
(3)
, TJ
–0.4 to VS+
V
±90
mA
+150
°C
+125
°C
°C
+300
°C
Human body model (HBM)
2000
V
Charged device model (CDM)
1000
V
Machine model
200
V
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
(2)
(3)
V
–65 to +150
Storage temperature range, TSTG
(1)
UNIT
5.5
See Dissipation Ratings Table
Maximum junction temperature, any condition (2) TJ
ESD ratings
THS7375
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
The absolute maximum junction temperature under any condition is limited by the constraints of the silicon process.
The absolute maximum junction temperature for continuous operation is limited by the package constraints. Operation above this
temperature may result in reduced reliability and/or lifetime of the device.
DISSIPATION RATINGS
(1)
(2)
PACKAGE
qJC
(°C/W)
qJA
(°C/W)
AT TA ≤ +25°C
POWER RATING (1)
AT TA = +85°C
POWER RATING (1)
TSSOP-14 (PW)
35
115 (2)
870 mW
348 mW
Power rating is determined with a junction temperature of +125°C. This is the point where performance starts to degrade and long-term
reliability starts to be reduced. Thermal management of the final PCB should strive to keep the junction temperature at or below +125°C
for best performance and reliability.
These data were taken with the JEDEC High-K test printed circuit board (PCB). For the JEDEC low-K test PCB, the qJA is +185°C.
RECOMMENDED OPERATING CONDITIONS
MIN
Supply voltage, VS+
Ambient temperature, TA
2
NOM
MAX
UNIT
3
5
V
–40
+85
°C
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SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V
RL = 150 Ω to GND, dc-coupled input and output, Filter Mode, unless otherwise noted.
THS7375
TYP
OVER TEMPERATURE
TEST CONDITIONS
+25°C
+25°C
0°C to
+70°C
Small-signal bandwidth (–3 dB)
VO = 0.2 VPP (1)
9.5
7.6/11.4
7.4/11.6
7.3/11.7
Min/
Max
MHz
Large-signal bandwidth (–3 dB)
VO = 2 VPP (1)
9.5
7.6/11.4
7.4/11.6
7.3/11.7
Min/
Max
MHz
8
Typ
MHz
PARAMETER
MIN/
–40°C to TYP/
+85°C
MAX
UNITS
AC PERFORMANCE
–1 dB passband bandwidth
Bypass mode bandwidth (–3 dB)
VO = 0.2 VPP
70
Typ
MHz
Slew rate
Bypass mode
150
Typ
V/ms
f = 6.75 MHz (2)
0.3
–0.9/1.1
–1/1.4
–1.1/1.6
Min/
Max
dB
f = 27 MHz (2)
54
42
40
39
Min
dB
Group delay
f = 100 kHz
75
Typ
ns
Group delay variation
with respect to 100 kHz
f = 5.1 MHz
10
Typ
ns
0.3
Typ
ns
NTSC/PAL
0.2/0.3
TYP
%
Attenuation
with respect to 500 kHz
Channel-to-channel delay
Differential gain
Differential phase
Total harmonic distortion
Signal-to-noise ratio
Channel-to-channel crosstalk
NTSC/PAL
0.35/0.5
Typ
°
f = 1 MHz, VO = 2 VPP
–65
Typ
dB
100 kHz to 6 MHz: non-weighted /
unified weighting
61 / 70
Typ
dB
f = 1 MHz, worst case
–55
Typ
dB
14.95
Min/
Max
dB
Typ
Ω
Min/
Max
mV
AC gain—all channels
Output impedance
f = 5 MHz, Filter Mode
1.4
VIN = 0 V
320
DC input, limited by output
–0.1/0.52
VIN = –0.1 V
200
14.7/15.3
14.6/15.4
14.6/15.4
DC PERFORMANCE
Biased output voltage
Input voltage range
170/430
160/440
150/450
140
130
120
Typ
V
Min
mA
800
Typ
kΩ
2
Typ
pF
RL = 150 Ω to +1.65 V
3.15
Typ
V
Sync tip clamp charge current
Input resistance
Input capacitance
OUTPUT CHARACTERISTICS
High output voltage swing
RL = 150 Ω to GND
3.1
Min
V
RL = 75 Ω to +1.65 V
3.1
Typ
V
RL = 75 Ω to GND
3
Typ
V
RL = 150 Ω to +1.65 V (VIN = –0.2 V)
0.05
RL = 150 Ω to GND (VIN = –0.2 V)
0.02
RL = 75 Ω to +1.65 V (VIN = –0.2 V)
2.85
2.75
2.75
Typ
V
Max
V
0.1
Typ
V
RL = 75 Ω to GND (VIN = –0.2 V)
0.05
Typ
V
Output current (sourcing)
RL = 10 Ω to +1.65 V
80
Typ
mA
Output current (sinking)
RL = 10 Ω to +1.65 V
70
Typ
mA
Low output voltage swing
(1)
(2)
0.12
0.16
0.17
The min/max values listed for this specification are ensured by design and characterization only.
3.3-V supply filter specifications are ensured by 100% testing at 5-V supply along with design and characterization only.
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ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued)
RL = 150 Ω to GND, dc-coupled input and output, Filter Mode, unless otherwise noted.
THS7375
PARAMETER
TYP
OVER TEMPERATURE
TEST CONDITIONS
+25°C
+25°C
0°C to
+70°C
VS+ to GND
3.3
5.5
5.5
5.5
MIN/
–40°C to TYP/
+85°C
MAX
UNITS
POWER SUPPLY
Maximum operating voltage
Minimum operating voltage
VS+ to GND
(3)
Max
V
3.3
2.85
2.85
2.85
Min
V
Maximum quiescent current
VIN = 0 V; VS+ = 3.3 V
9.8
12
13
14
Max
mA
Minimum quiescent current
VIN = 0 V; VS+ = 3.3 V
9.8
8
7
6.5
Min
mA
Typ
dB
Power-supply rejection (+PSRR)
53
LOGIC CHARACTERISTICS (4)
VIH
Disabled or bypass engaged
1.8
2
2
2
Min
V
VIL
Enabled or bypass disengaged
0.7
0.65
0.6
0.6
Max
V
IIH
0.2
Typ
mA
IIL
0.2
Typ
mA
Disable time
100
Typ
ns
Enable time
100
Typ
ns
5
Typ
ns
Max
mA
Typ
kΩ ∥ pF
Bypass/filter switch time
Disabled quiescent current
Disable pin = 2 V
0.1
Disabled output impedance
Disable pin = 2 V
20 ∥ 3
(3)
(4)
4
10
10
10
The min/max values listed for this specification are ensured by design and characterization only.
The logic input pins should not be left floating. They must be connected to logic low (or GND) or logic high (or VS+).
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THS7375
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SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
ELECTRICAL CHARACTERISTICS: VS+ = +5 V
RL = 150 Ω to GND, dc-coupled input and output, Filter Mode, unless otherwise noted.
THS7375
TYP
OVER TEMPERATURE
TEST CONDITIONS
+25°C
+25°C
0°C to
+70°C
Small-signal bandwidth (–3 dB)
VO = 0.2 VPP (1)
9.5
7.6/11.4
7.4/11.6
7.3/11.7
Min/
Max
MHz
Large-signal bandwidth (–3 dB)
VO = 2 VPP (1)
9.5
7.6/11.4
7.4/11.6
7.3/11.7
Min/
Max
MHz
8
Typ
MHz
PARAMETER
MIN/
–40°C to TYP/
+85°C
MAX
UNITS
AC PERFORMANCE
–1 dB passband bandwidth
Bypass mode bandwidth (–3 dB)
VO = 0.2 VPP
70
Typ
MHz
Slew rate
Bypass mode
150
Typ
V/ms
f = 6.75 MHz
0.3
–0.9/1.1
–1/1.4
–1.1/1.6
Min/
Max
dB
42
40
39
Attenuation
with respect to 500 kHz
f = 27 MHz
54
Min
dB
Group delay
f = 100 kHz
75
Typ
ns
Group delay variation
with respect to 100 kHz
f = 5.1 MHz
10
Typ
ns
0.3
Typ
ns
NTSC/PAL
0.2/0.3
Typ
%
Channel-to-channel delay
Differential gain
Differential phase
Total harmonic distortion
Signal-to-noise ratio
Channel-to-channel crosstalk
NTSC/PAL
0.35/0.5
Typ
°
f = 1 MHz, VO = 2 VPP
–70
Typ
dB
100 kHz to 6 MHz: non-weighted /
unified weighting
61/70
Typ
dB
f = 1 MHz, worst case
–55
Typ
dB
14.95
Min/
Max
dB
Typ
Ω
Min/
Max
mV
AC gain—all channels
Output impedance
f = 5 MHz; filter mode
1.4
VIN = 0 V
320
Limited by output
–0.1/0.8
VIN = –0.1 V
200
14.7/15.3
14.6/15.4
14.6/15.4
DC PERFORMANCE
Biased output voltage/level shift
Input voltage range
170/430
160/440
150/450
140
130
120
Typ
V
Min
mA
800
Typ
kΩ
2
Typ
pF
RL = 150 Ω to +2.5V
4.85
Typ
V
RL = 150 Ω to GND
4.75
Min
V
RL = 75 Ω to +2.5V
4.7
Typ
V
RL = 75 Ω to GND
4.5
Typ
V
RL = 150 Ω to +2.5V (VIN = –0.2 V)
0.05
RL = 150 Ω to GND (VIN = –0.2 V)
0.02
RL = 75 Ω to +2.5 V (VIN = –0.2 V)
Sync tip clamp charge current
Input resistance
Input capacitance
OUTPUT CHARACTERISTICS
High output voltage swing
4.4
4.3
4.3
Typ
V
Max
V
0.1
Typ
V
RL = 75 Ω to GND (VIN = –0.2 V)
0.05
Typ
V
Output current (sourcing)
RL = 10 Ω to +2.5 V
90
Typ
mA
Output current (sinking)
RL = 10 Ω to +2.5 V
85
Typ
mA
Low output voltage swing
(1)
0.12
0.16
0.17
The min/max values listed for this specification are ensured by design and characterization only.
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THS7375
SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
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ELECTRICAL CHARACTERISTICS: VS+ = +5 V (continued)
RL = 150 Ω to GND, dc-coupled input and output, Filter Mode, unless otherwise noted.
THS7375
PARAMETER
TYP
OVER TEMPERATURE
TEST CONDITIONS
+25°C
+25°C
0°C to
+70°C
VS+ to GND
5
5.5
5.5
5.5
MIN/
–40°C to TYP/
+85°C
MAX
UNITS
POWER SUPPLY
Maximum operating voltage
Minimum operating voltage
VS+ to GND
(2)
Max
V
5
2.85
2.85
2.85
Min
V
Maximum quiescent current
VIN = 0 V, VS+ = 5 V
10.3
12.5
13.5
14.5
Max
mA
Minimum quiescent current
VIN = 0 V, VS+ = 5 V
10.3
8
7.5
7
Min
mA
Typ
dB
Power-supply rejection (+PSRR)
53
DISABLE CHARACTERISTICS (3)
VIH
Disabled/bypass engaged (4)
2.1
2.2
2.2
2.2
Min
V
VIL
Enabled/bypass disengaged
0.8
0.8
0.8
0.8
Max
V
IIH
0.2
Typ
mA
IIL
0.2
Typ
mA
Disable time
80
Typ
ns
Enable time
80
Typ
ns
Bypass/filter switch time
5
Typ
ns
Max
mA
Typ
kΩ ∥ pF
Disabled quiescent current
Disable pin = 3 V
1
Disabled output impedance
Disable pin = 3 V
20 ∥ 3
(2)
(3)
(4)
6
10
10
10
The min/max values listed for this specification are ensured by design and characterization only.
The logic input pins should not be left floating. They must be connected to logic low (or GND) or logic high (or VS+).
Defined as applied logic voltage to achieve total quiescent current of less than 100 mA.
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SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
PIN CONFIGURATION
PW PACKAGE
TSSOP-14
TOP VIEW
CH1 IN
1
14 CH1 OUT
CH2 IN
2
13 CH2 OUT
CH3 IN
3
12 CH3 OUT
CH4 IN
4
GND
5
10 VS+
DISABLE
6
9
BYPASS
NC
7
8
NC
THS7375IPW
11 CH4 OUT
Table 1. TERMINAL FUNCTIONS
TERMINAL
NAME
NO.
I/O
DESCRIPTION
CH1 IN
1
I
Video input; channel 1
CH2 IN
2
I
Video input; channel 2
CH3 IN
3
I
Video input; channel 3
CH4 IN
4
I
Video input; channel 4
GND
5
I
Ground pin for all internal circuitry
DISABLE
6
I
Disable pin. Logic high disables the part; logic low enables the part. This pin must not be left
floating. It must be connected to a defined logic state (or GND or VS+)
NC
7, 8
—
BYPASS
9
I
Internal filter bypass. Logic high bypasses the internal low-pass filter; logic low uses the
internal filters.This pin must not be left floating. It must be connected to a defined logic state
(or GND or VS+)
No internal connection
VS+
10
I
Positive power-supply pin; connect to +3 V to +5 V
CH4 OUT
11
O
Video output; channel 4
CH3 OUT
12
O
Video output; channel 3
CH2 OUT
13
O
Video output; channel 2
CH1 OUT
14
O
Video output; channel 1
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FUNCTIONAL BLOCK DIAGRAM
+VS
gm
Level
Shift
Channel 1
Input
LPF
Sync-Tip Clamp
(DC Restore)
800 kW
Bypass
5.6 V/V
Channel 1
Output
5.6 V/V
Channel 2
Output
5.6 V/V
Channel 3
Output
5.6 V/V
Channel 4
Output
6-Pole
9.5-MHz
+VS
gm
Level
Shift
Channel 2
Input
LPF
Sync-Tip Clamp
(DC Restore)
800 kW
Bypass
6-Pole
9.5-MHz
+VS
gm
Level
Shift
Channel 3
Input
LPF
Sync-Tip Clamp
(DC Restore)
800 kW
Bypass
6-Pole
9.5-MHz
+VS
gm
Level
Shift
Channel 4
Input
800 kW
8
LPF
Sync-Tip Clamp
(DC Restore)
+3.3 V to +5 V
Bypass
6-Pole
9.5-MHz
BYPASS
DISABLE
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SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
TYPICAL CHARACTERISTICS
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
TOTAL QUIESCENT CURRENT vs TEMPERATURE
OUTPUT OFFSET VOLTAGE vs TEMPERATURE
11.0
340
Output Offset Voltage (mV)
Total Quiescent Current (mA)
Input = 0 V
335
10.6
VS+ = 5 V
10.2
9.8
VS+ = 3.3 V
9.4
330
325
VS+ = 5 V
320
VS+ = 3.3 V
315
310
305
300
9.0
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
Ambient Temperature (°C)
Ambient Temperature (°C)
Figure 2.
Figure 3.
INPUT RESISTANCE vs TEMPERATURE
MAXIMUM OUTPUT VOLTAGE vs TEMPERATURE
5.0
810
VS+ = 5 V
4.8
Maximum Output Voltage (V)
Input Resistance (kW)
VS+ = 3.3 V and 5 V
Input = 1 V
805
800
795
4.6
4.4
4.2
Load = 150 W to GND
DC-Coupled
4.0
3.8
3.6
3.4
VS+ = 3.3 V
3.2
790
3.0
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
-40 -30 -20 -10 0
Figure 4.
Figure 5.
MINIMUM OUTPUT VOLTAGE vs TEMPERATURE
ATTENUATION AT 6.75 MHz vs TEMPERATURE
1.0
Load = 150 W to GND
DC-Coupled
Attenuation at 6.75 MHz (dB)
Minimum Output Voltage (V)
0.05
0.04
0.03
VS+ = 5 V
0.02
0.01
10 20 30 40 50 60 70 80 90
Ambient Temperature (°C)
Ambient Temperature (°C)
VS+ = 3.3 V
VS+ = 5 V
0.8
0.6
0.4
0.2
0
-0.2
-0.4
0
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
-40 -30 -20 -10 0
Ambient Temperature (°C)
10 20 30 40 50 60 70 80 90
Ambient Temperature (°C)
Figure 6.
Figure 7.
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TYPICAL CHARACTERISTICS (continued)
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
ATTENUATION AT 27 MHz vs TEMPERATURE
Attenuation at 27 MHz (dB)
57
VS+ = 5 V
56
55
54
53
52
51
50
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
Ambient Temperature (°C)
Figure 8.
10
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TYPICAL CHARACTERISTICS: VS+ = 3.3 V
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
SMALL-SIGNAL GAIN vs FREQUENCY
SMALL-SIGNAL GAIN vs FREQUENCY
15.5
20
Bypass
Mode
0
RL = 75 W
-10
RL = 150 W
Filter Mode
-20
RL = 150 W
-30
-40
-50
VS+ = 3.3 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
-60
100 k
10 M
14.0
RL = 75 W and 150 W
13.5
Filter Mode
13.0
12.5
12.0
VS+ = 3.3 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
11.0
100 k
1G
100 M
Bypass
Mode
14.5
11.5
RL = 75 W
1M
RL = 75 W
15.0
Small-Signal Gain (dB)
Small-Signal Gain (dB)
10
1M
Figure 9.
Figure 10.
PHASE vs FREQUENCY
GROUP DELAY vs FREQUENCY
45
7.0
6.5
0
RL = 150 W
6.0
Phase (°)
RL = 75 W and 150 W
RL = 75 W
Filter Mode
-180
-225
-270
-315
Bypass
Mode
VS+ = 3.3 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
-360
100 k
1M
Group Delay (ns)
-45
-135
5.5
VS+ = 3.3 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
4.5
Bypass Mode
4.0
RL = 150 W
3.5
3.0
2.5
10 M
2.0
100 k
1G
100 M
1M
10 M
Figure 12.
GROUP DELAY vs FREQUENCY
130
Bypass
Mode
10
Large-Signal Gain (dB)
Group Delay (ns)
LARGE-SIGNAL GAIN vs FREQUENCY
20
Filter Mode
VS+ = 3.3 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
100
RL = 75 W and 150 W
90
80
70
0
-10
VS+ = 3.3 V
AC-Coupled Output
Load = 150 W || 10 pF
-20
-30
-40
60
-50
50
100 k
-60
100 k
1M
1G
100 M
Frequency (Hz)
Figure 11.
110
RL = 75 W
5.0
Frequency (Hz)
120
100 M
10 M
Frequency (Hz)
Frequency (Hz)
-90
RL = 150 W
10 M
100 M
Frequency (Hz)
VO = 0.2 VPP
VO = 1 VPP
Filter
Mode
VO = 2 VPP
VO = 2 VPP
VO = 0.2 VPP
1M
10 M
100 M
1G
Frequency (Hz)
Figure 13.
Figure 14.
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TYPICAL CHARACTERISTICS: VS+ = 3.3 V (continued)
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
LARGE-SIGNAL GAIN vs FREQUENCY
SMALL-SIGNAL GAIN vs FREQUENCY
15.5
20
Bypass
Mode
14.5
VO = 1 VPP
14.0
VO = 2 VPP
13.5
VO = 2 VPP
13.0
VO = 0.2 VPP
Filter Mode
12.5
12.0
11.5
VS+ = 3.3 V
AC-Coupled Output
Load = 150 W || 10 pF
11.0
100 k
Small-Signal Gain (dB)
DC
VS+ = 3.3 V
Load = 150 W || 10 pF
VOUT = 200 mVPP
-40
AC
AC or DC
Filter Mode
DC
12.5
VS+ = 3.3 V
Load = 150 W || 10 pF
VOUT = 200 mVPP
1M
-50
-60
f = 16 MHz
-70
f = 8 MHz
-80
f = 2 MHz
f = 4 MHz
0
0.5
1.0
2.0
1.5
Figure 17.
Figure 18.
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
-40
2nd-Order Harmonic Distortion (dB)
f = 16 MHz
VS+ = 3.3 V
Bypass Mode
RL = 150 W || 10 pF
DC-Coupled Output
f = 8 MHz
-60
-70
f = 1 MHz
2.5
Output Voltage (VPP)
Frequency (Hz)
3rd-Order Harmonic Distortion (dB)
f = 1 MHz
-90
100 M
10 M
1G
VS+ = 3.3 V
Bypass Mode
RL = 150 W || 10 pF
DC-Coupled Output
-100
11.0
100 k
f = 2 MHz
-80
f = 4 MHz
-90
-100
f = 4 MHz
-50
f = 2 MHz
-60
-70
-80
VS+ = 3.3 V
Filter Mode
RL = 150 W || 10 pF
DC-Coupled Output
f = 1 MHz
-90
-100
0
0.5
1.0
1.5
2.0
2.5
0
Output Voltage (VPP)
0.5
1.0
1.5
2.0
2.5
Output Voltage (VPP)
Figure 19.
12
100 M
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
AC- versus
DC-Coupled Outputs
-50
10 M
SMALL-SIGNAL GAIN vs FREQUENCY
Bypass
Mode
-40
AC
1M
Figure 16.
13.0
11.5
-40
Figure 15.
14.0
12.0
Filter Mode
-30
Frequency (Hz)
15.0
13.5
AC
-20
Frequency (Hz)
15.5
14.5
DC
-10
-60
100 k
100 M
10 M
AC- versus
DC-Coupled Outputs
0
-50
1M
Bypass
Mode
10
Small-Signal Gain (dB)
VO = 0.2 VPP
2nd-Order Harmonic Distortion (dB)
Large-Signal Gain (dB)
15.0
Figure 20.
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TYPICAL CHARACTERISTICS: VS+ = 3.3 V (continued)
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
-40
VS+ = 3.3 V
Filter Mode
RL = 150 W || 10 pF
DC-Coupled Output
-50
2nd-Order Harmonic Distortion (dB)
3rd-Order Harmonic Distortion (dB)
-40
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
f = 4 MHz
-60
-70
-80
f = 1 MHz
-90
f = 2 MHz
-100
f = 1 MHz to 8 MHz
-50
-60
f = 16 MHz
-70
-80
VS+ = 3.3 V
Bypass Mode
RL = 150 W || 10 pF
AC-Coupled Output
-90
-100
0
0.5
1.0
2.0
1.5
0
2.5
0.5
Output Voltage (VPP)
2.0
Figure 22.
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
2.5
-40
2nd-Order Harmonic Distortion (dB)
f = 16 MHz
-50
f = 8 MHz
-60
f = 4 MHz
-70
-80
VS+ = 3.3 V
Bypass Mode
RL = 150 W || 10 pF
AC-Coupled Output
-90
f = 2 MHz
f = 1 MHz
-100
-50
f = 2 MHz
-60
f = 1 MHz
f = 4 MHz
-70
-80
VS+ = 3.3 V
Filter Mode
RL = 150 W || 10 pF
AC-Coupled Output
-90
-100
0
0.5
1.0
1.5
2.0
0
2.5
0.5
Output Voltage (VPP)
1.0
Output Impedance (W)
-50
2.5
OUTPUT IMPEDANCE vs FREQUENCY
100
VS+ = 3.3 V
Filter Mode
RL = 150 W || 10 pF
AC-Coupled Output
2.0
Figure 24.
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
-40
1.5
Output Voltage (VPP)
Figure 23.
3rd-Order Harmonic Distortion (dB)
1.5
Figure 21.
-40
3rd-Order Harmonic Distortion (dB)
1.0
Output Voltage (VPP)
f = 4 MHz
-60
-70
-80
f = 1 MHz
VS+ = 3.3 V
10
Filter Mode
1
Bypass Mode
-90
f = 2 MHz
-100
0
0.5
1.0
1.5
2.0
2.5
0.1
100 k
Output Voltage (VPP)
1M
10 M
100 M
Frequency (Hz)
Figure 25.
Figure 26.
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TYPICAL CHARACTERISTICS: VS+ = 3.3 V (continued)
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
RETURN LOSS vs FREQUENCY
-5
VS+ = 3.3 V
R = 75 W
Return Loss (dB)
-15
-25
-35
Filter Mode
-45
Bypass Mode
-55
100 k
1M
10 M
100 M
Frequency (Hz)
Figure 27.
14
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TYPICAL CHARACTERISTICS: VS+ = 5 V
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
SMALL-SIGNAL GAIN vs FREQUENCY
SMALL-SIGNAL GAIN vs FREQUENCY
15.5
20
Bypass
Mode
0
RL = 75 W
-10
RL = 150 W
Filter Mode
-20
-30
-40
-50
RL = 150 W
VS+ = 5 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
-60
100 k
10 M
14.5
14.0
AC or DC
13.5
13.0
12.5
12.0
11.5
RL = 75 W
1M
Filter Mode
Figure 29.
GROUP DELAY vs FREQUENCY
7.0
6.5
RL = 150 W
6.0
Phase (°)
-90
RL = 75 W and 150 W
-135
Filter Mode
-180
Bypass
Mode
RL = 75 W
VS+ = 5 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
-360
100 k
1M
Group Delay (ns)
-45
5.5
VS+ = 5 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
4.5
Bypass Mode
4.0
RL = 150 W
3.5
3.0
2.5
10 M
2.0
100 k
1G
100 M
1M
10 M
Figure 31.
GROUP DELAY vs FREQUENCY
130
10
Large-Signal Gain (dB)
Group Delay (ns)
LARGE-SIGNAL GAIN vs FREQUENCY
20
Filter Mode
VS+ = 5 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
100
RL = 75 W and 150 W
90
80
70
0
-10
-20
-30
-40
-50
50
100 k
-60
100 k
10 M
100 M
Bypass
Mode
VS+ = 5 V
AC-Coupled Output
Load = 150 W || 10 pF
60
1M
1G
100 M
Frequency (Hz)
Figure 30.
110
RL = 75 W
5.0
Frequency (Hz)
120
100 M
10 M
Figure 28.
0
-315
1M
Frequency (Hz)
PHASE vs FREQUENCY
-270
DC
Frequency (Hz)
45
-225
AC
VS+ = 5 V
AC-Coupled Output
CL = 10 pF
VOUT = 200 mVPP
11.0
100 k
1G
100 M
Bypass
Mode
15.0
Small-Signal Gain (dB)
Small-Signal Gain (dB)
10
Frequency (Hz)
VO = 0.2 VPP
Filter
Mode
VO = 1 VPP
VO = 2 VPP
VO = 2 VPP
VO = 0.2 VPP
1M
10 M
100 M
1G
Frequency (Hz)
Figure 32.
Figure 33.
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TYPICAL CHARACTERISTICS: VS+ = 5 V (continued)
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
LARGE-SIGNAL GAIN vs FREQUENCY
15.5
Bypass
Mode
VS+ = 5 V
AC-Coupled Output
Load = 150 W || 10 pF
13.5
Small-Signal Gain (dB)
14.0
Filter Mode
13.0
VO = 0.2 VPP
12.5
VO = 1 VPP
12.0
VO = 2 VPP
VO = 2 VPP
11.5
1M
Small-Signal Gain (dB)
VS+ = 5 V
Load = 150 W || 10 pF
VOUT = 200 mVPP
1M
-40
AC
AC or DC
Filter Mode
DC
VS+ = 5 V
Load = 150 W || 10 pF
VOUT = 200 mVPP
VS+ = 5 V
Bypass Mode
RL = 150 W || 10 pF
DC-Coupled Output
-50
1M
-70
f = 1 MHz
f = 2 MHz
-80
f = 8 MHz
-90
f = 4 MHz
0
100 M
10 M
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Output Voltage (VPP)
Figure 36.
Figure 37.
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
-40
RL = 150 W || 10 pF
DC-Coupled Output
Bypass Mode
VS+ = 5 V
2nd-Order Harmonic Distortion (dB)
3rd-Order Harmonic Distortion (dB)
f = 16 MHz
-60
Frequency (Hz)
f = 16 MHz
-60
f = 8 MHz
-70
-80
f = 4 MHz
-90
f = 2 MHz
f = 1 MHz
-100
-50
f = 4 MHz
-60
-70
f = 1 MHz
f = 2 MHz
-80
VS+ = 5 V
Filter Mode
RL = 150 W || 10 pF
DC-Coupled Output
-90
-100
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
Output Voltage (VPP)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Output Voltage (VPP)
Figure 38.
16
1G
100 M
-100
11.0
100 k
-50
10 M
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
AC- versus
DC-Coupled Outputs
-40
AC
SMALL-SIGNAL GAIN vs FREQUENCY
12.5
11.5
-40
Figure 35.
13.0
12.0
AC
DC
Figure 34.
Bypass
Mode
13.5
Filter Mode
-30
Frequency (Hz)
15.0
14.0
DC
-20
Frequency (Hz)
15.5
14.5
-10
-60
100 k
100 M
10 M
AC- versus
DC-Coupled Outputs
0
-50
VO = 0.2 VPP
11.0
100 k
Bypass
Mode
10
2nd-Order Harmonic Distortion (dB)
Large-Signal Gain (dB)
15.0
14.5
SMALL-SIGNAL GAIN vs FREQUENCY
20
Figure 39.
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TYPICAL CHARACTERISTICS: VS+ = 5 V (continued)
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
-40
VS+ = 5 V
Filter Mode
RL = 150 W || 10 pF
DC-Coupled Output
-50
-60
f = 4 MHz
-70
-80
f = 1 MHz
-90
f = 2 MHz
2nd-Order Harmonic Distortion (dB)
3rd-Order Harmonic Distortion (dB)
-40
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
-100
f = 1 MHz to 8 MHz
-50
-60
f = 16 MHz
-70
-80
VS+ = 5 V
Bypass Mode
RL = 150 W || 10 pF
AC-Coupled Output
-90
-100
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
4.0
0.5
1.0
1.5
Output Voltage (VPP)
2ND-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
2nd-Order Harmonic Distortion (dB)
3rd-Order Harmonic Distortion (dB)
-50
f = 8 MHz
-60
f = 4 MHz
-70
-80
VS+ = 5 V, Bypass Mode
RL = 150 W || 10 pF
AC-Coupled Output
0.5
1.0
1.5
f = 2 MHz
f = 1 MHz
f = 2 MHz
f = 1 MHz
-60
f = 4 MHz
-70
-80
VS+ = 5 V
Filter Mode
RL = 150 W || 10 pF
AC-Coupled Output
-90
-100
2.0
2.5
3.0
3.5
0
4.0
0.5
1.0
1.5
3.0
3.5
4.0
OUTPUT IMPEDANCE vs FREQUENCY
100
Output Impedance (W)
3rd-Order Harmonic Distortion (dB)
2.5
Figure 43.
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
VS+ = 5 V
Filter Mode
RL = 150 W || 10 pF
AC-Coupled Output
2.0
Output Voltage (VPP)
Figure 42.
-50
4.0
-50
Output Voltage (VPP)
-40
3.5
3RD-ORDER HARMONIC DISTORTION
vs OUTPUT VOLTAGE
-40
0
3.0
Figure 41.
f = 16 MHz
-100
2.5
Figure 40.
-40
-90
2.0
Output Voltage (VPP)
f = 4 MHz
-60
-70
-80
f = 1 MHz
VS+ = 5 V
10
Filter Mode
1
Bypass Mode
-90
f = 2 MHz
-100
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.1
100 k
Output Voltage (VPP)
1M
10 M
100 M
Frequency (Hz)
Figure 44.
Figure 45.
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TYPICAL CHARACTERISTICS: VS+ = 5 V (continued)
RL = 150 Ω to GND and dc-coupled input and output, unless otherwise noted.
RETURN LOSS vs FREQUENCY
-5
VS+ = 5 V
R = 75 W
Return Loss (dB)
-15
-25
-35
Filter Mode
-45
Bypass Mode
-55
100 k
1M
10 M
100 M
Frequency (Hz)
Figure 46.
18
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SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
APPLICATION INFORMATION
The THS7375 is targeted for standard definition video
output buffer applications. Although it can be used for
numerous other applications, the needs and
requirements of the video signal are the most
important design parameters of the THS7375. Built
on the revolutionary complementary Silicon
Germanium (SiGe) BiCom3X process, the THS7375
incorporates many features not typically found in
integrated video parts while consuming very low
power. The THS7375 has the following features:
• Single-supply 3-V to 5-V operation with low total
quiescent current of 9.8 mA at 3.3 V and 10.3 mA
at 5 V.
• Disable mode allows for shutting down the
THS7375
to
save
system
power
in
power-sensitive applications.
• Input configuration accepts dc + level shift, ac
sync-tip clamp, or ac-bias.
• AC-biasing is allowed with the use of a single
external pull-up resistor to the positive power
supply.
• Sixth-order low-pass filter for DAC reconstruction
or ADC image rejection:
– 9.5 MHz for NTSC, PAL, SECAM, composite
(CVBS), S-Video Y’C’, 480i/576i Y’P’BP’R,
G’B’R’ (R'G'B'), and SCART signals.
• Bypass mode bypasses the low-pass filter with a
70-MHz bandwidth and 150-V/ms slew rate
amplifier
• Internal fixed gain of 5.6 V/V (+14.95 dB) buffer
that can drive two video lines per channel with
dc-coupling or traditional ac-coupling. This feature
is ideal for DaVinci, DM2xx, DM3xx, DM64xx, and
OMAP processors.
• Signal flow-through configuration in a TSSOP-14
package that complies with the latest lead-free
(RoHS-compatible) and green manufacturing
requirements.
Place a 0.1-mF to 0.01-mF capacitor as close as
possible to the power-supply pins. Failure to do so
may result in ringing or oscillating at the THS7375
outputs. Additionally, a large capacitor (22 mF to 100
mF) should be placed on the power-supply line to
minimize interference with 50-Hz/60-Hz line
frequencies.
INPUT VOLTAGE
The THS7375 input range allows for an input signal
range from –0.2 V to approximately (VS+ – 1.5 V).
However, because of the internal fixed gain of 5.6
V/V (+14.95 dB) and the internal level shift that
causes a 320-mV level shift, the output is generally
the limiting factor for the allowable linear input range.
For example, with a 5-V supply, the linear input range
is from –0.2 V to 3.5 V. As a result of the gain and
level shift, the linear output range limits the allowable
linear input range to be from about –0.1 V to 0.8 V.
INPUT OVERVOLTAGE PROTECTION
The THS7375 is built using a very high-speed
complementary bipolar and CMOS process. The
internal junction breakdown voltages are relatively
low for these very small geometry devices. These
breakdowns are reflected in the Absolute Maximum
Ratings table. All input and output device pins are
protected with internal ESD protection diodes to the
power supplies, as shown in Figure 47.
+VS
External
Input/Output
Pin
Internal
Circuitry
Figure 47. Internal ESD Protection
OPERATING VOLTAGE
The THS7375 is designed to operate from 3-V to 5-V
over a –40°C to +85°C temperature range. The
impact on performance over the entire temperature
range is negligible as a result of the implementation
of thin film resistors and high quality, low temperature
coefficient capacitors. The design of the THS7375
allows operation down to 2.85 V, but it is
recommended to use at least a 3-V supply to ensure
that there are no issues with headroom or clipping.
These diodes provide moderate protection to input
overdrive voltages above and below the supplies as
well. The protection diodes can typically support 30
mA of continuous current when overdriven.
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TYPICAL CONFIGURATION AND VIDEO
TERMINOLOGY
This rationale is also used for the chroma (C') term.
Chroma is derived from the nonlinear R'G'B' terms
and thus it is also nonlinear. Chominance (C) is
derived from linear RGB, giving the difference
between chroma (C') and chrominance (C). The color
difference signals (P'B/P'R/U'/V') are also referenced
in this way to denote the nonlinear (gamma
corrected) signals.
A typical application circuit that uses the THS7375 as
a video buffer is shown in Figure 48. It shows a DAC
or encoder driving the input channels of the
THS7375. One channel is a composite video (CVBS)
channel of a standard definition (SD) video system.
The other channels are the component video Y'P'BP'R
(sometimes labeled Y'U'V' or incorrectly labeled
Y'C'BC'R) signals of a 480i or 576i system. These
channels could easily be the S-Video Y'/C' channels
or the R'G'B' channels of a SCART system.
R'G'B' (commonly mislabeled RGB) is also called
G'B'R' (again commonly mislabeled as GBR) in
professional video systems. The SMPTE component
standard stipulates that the luma information is
placed on the first channel, the blue color difference
is placed on the second channel, and the red color
difference signal is placed on the third channel. This
configuration is consistent with the Y'P'BP'R
nomenclature. Because the luma channel (Y') carries
the sync information and the green channel (G') also
carries the sync information, it makes logical sense
that G' be placed first in the system. Furthermore,
because the blue color difference channel (P'B) is
next and the red color difference channel (P'R) is last,
then it also makes logical sense to place the B' signal
on the second channel and the R' signal on the third
channel respectfully. Thus, hardware compatibility is
better achieved when using G'B'R' rather than R'G'B'.
Note that for many G'B'R' systems, sync is embedded
on all three channels, but this configuration may not
always be the case in all systems.
Note that the Y' term is used for the luma channels
throughout this document rather than the more
common luminance (Y) term. The reason for this
usage is to account for the definition of luminance as
stipulated by the International Commission on
Illumination (CIE). Video departs from true luminance
because a nonlinear term, gamma, is added to the
true RGB signals to form R'G'B' signals. These R'G'B'
signals are then used to mathematically create luma
(Y'). Thus, luminance (Y) is not maintained, providing
a difference in terminology.
+3.3 V
THS7375
CVBS/Sync
DaVinci
DAC/Encoder
SDTV
CVBS
S-Video
Y'P'BP'R
R'G'B'
Y'/G'
R
P’B/B'
CH1 IN
CH1 OUT 14
2
CH2 IN
CH2 OUT 13
3
CH3 IN
CH3 OUT 12
4
CH4 IN
CH4 OUT 11
5
GND
6
DISABLE
7
NC
75 W
Y'/G' Out
75 W 330 mF
+
R
1
75 W
VS+ 10
BYPASS
NC
P'B/B' Out
9
75 W 330 mF
+
CVBS
+
75 W 330 mF
8
R
75 W
P'R/R' Out
R
75 W 330 mF
To GPIO Controller
or GND
+
P’R/R'
75 W
+3 V to +5 V
Figure 48. Typical SDTV CVBS/Y'P'BP'R Inputs from DC-Coupled Encoder/DAC
with AC-Coupled Line Driving
20
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INPUT MODE OF OPERATION: DC
The THS7375 allows for both ac-coupled and
dc-coupled inputs. Many DACs or video encoders can
be dc-connected to the THS7375. One of the
drawbacks to dc coupling, however, is when 0 V is
applied to the input. Although the input of the
THS7375 allows for a 0-V input signal with no issues,
the output swing of a traditional amplifier cannot yield
a 0-V signal, resulting in possible clipping. This
condition is true for any single-supply amplifier as a
result of output transistor limitations. Both CMOS and
bipolar transistors cannot go to 0 V while sinking
current. This characterization of a transistor is also
the same reason why the highest output voltage is
always less than the power-supply voltage when
sourcing current.
This output clipping can reduce the sync amplitudes
(both horizontal and vertical sync) on the video
signal. A problem occurs if the receiver of this video
signal uses an AGC loop to account for losses in the
transmission line. Some video AGC circuits derive
gain from the horizontal sync amplitude. If clipping
occurs on the sync amplitude, then the AGC circuit
can increase the gain too much—resulting in too
much luma and/or chroma amplitude gain correction.
This overcorrection may result in a picture with an
overly bright display with too much color saturation.
Other AGC circuits use the chroma burst amplitude
for amplitude control, and a reduction in the sync
signals does not alter the proper gain setting.
However, it is good engineering design practice to
ensure that saturation/clipping does not take place.
Transistors always take a finite amount of time to
come out of saturation. This saturation could possibly
result in timing delays or other aberrations on the
signals.
To eliminate saturation/clipping problems, the
THS7375 has a 320-mV output level shift feature.
This feature takes the input voltage and adds an
internal shift to the signal. The THS7375 rail-to-rail
output stage can create this output level while
connected to a typical video load. This feature
ensures that no saturation/clipping of the sync signals
occur. This shift is constant, regardless of the input
signal. For example, if a 0.4-V input is applied, the
output is at (0.4 V × 5.6 V/V) + 0.32 V = 2.56 V.
Because the internal gain is fixed at 5.6 V/V (+14.95
dB), the gain dictates what the allowable linear input
voltage range can be without clipping concerns. For
example, if the power supply is set to 3.3 V, the
maximum output is approximately 3.15 V while driving
a significant amount of current. Thus, to avoid
clipping, the allowable input is [(3.2 V – 0.32 V) / 5.6
V/V] = 0.51 V. This calculation is true for up to the
maximum recommended 5-V power supply that
allows approximately a [(4.9 V – 0.32 V) / 5.6 V/V] =
0.818 V input range while avoiding clipping on the
output.
The input impedance of the THS7375 in this mode of
operation is dictated by the internal 800-kΩ pull-down
resistor, as shown in Figure 49. Note that the internal
voltage shift does not appear at the input pin, but only
the output pin.
+VS
Internal
Circuitry
Input
Pin
800 kW
Level
Shift
Figure 49. Equivalent DC Input Mode Circuit
INPUT MODE OF OPERATION: AC SYNC-TIP
CLAMP
Some video DACs or encoders are not referenced to
ground but rather to the positive power supply. The
resulting video signals are generally at too high of a
voltage for a dc-coupled video buffer to function
properly. To account for this scenario, the THS7375
incorporates a sync-tip clamp (STC) circuit. This
function requires a capacitor (nominally 0.1 mF) to be
in series with the input. Note that while the term
sync-tip clamp is used throughout this document, it
should be noted that the THS7375 would probably be
better termed to be a dc restoration circuit based on
how this function is performed. This circuit is an
active clamp circuit and not a passive diode clamp
function.
The input to the THS7375 has an internal control loop
that sets the lowest input applied voltage to clamp at
ground (0 V). By setting the reference at 0 V, the
THS7375 allows a dc-coupled input to also function.
Therefore, the STC is considered transparent
because it does not operate unless the input signal
goes below ground. The signal then goes through the
same level shifter, resulting in an output voltage low
level of 320 mV. If the input signal tries to go below 0
V, the internal control loop of the THS7375 sources
up to 3 mA of current to increase the input voltage
level on the THS7375 input side of the coupling
capacitor. As soon as the voltage goes above the 0-V
level, the loop stops sourcing current and becomes
very high impedance.
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One of the concerns about the sync tip clamp level is
how the clamp reacts to a sync edge that has
overshoot—common in VCR signals or reflections
found in poor printed circuit board (PCB) layouts.
Ideally, the STC should not react to the overshoot
voltage of the input signal. Otherwise, this issue could
result in clipping on the remainder of the video signal
because it may raise the bias voltage too much.
To help minimize this input signal overshoot problem,
the control loop in the THS7375 has an internal
low-pass filter as shown in Figure 50. This filter
reduces the response time of the STC circuit. This
delay is a function of how far the voltage is below
ground, but in general it is close to an 800-ns delay.
This filter slows down the response of the control loop
so as not to clamp on the input overshoot voltage, but
rather the flat portion of the sync signal.
+VS
Comparator
Internal
Circuitry
STC LPF
+VS
Input
0.1 mF Input
Pin
800 kW
Level
Shift
Figure 50. Equivalent AC Sync-Tip Clamp Input
Circuit
As a result of this delay, the sync may have an
apparent voltage shift. The amount of shift depends
on the amount of droop in the signal as dictated by
the input capacitor and the STC current flow.
Because the sync is primarily for timing purposes,
with synchronization occurring on the edge of the
sync signal, this shift is transparent in most systems.
While this feature may not fully eliminate overshoot
issues on the input signal in case of severe overshoot
and/or ringing, the STC system should help minimize
improper clamping levels. As an additional method to
help minimize this issue, an external capacitor (such
as 10 pF to 47 pF) to ground in parallel with the
external termination resistors can help filter overshoot
problems.
It should be noted that this STC system is dynamic
and does not rely upon timing in any way. It only
depends on the voltage that appears at the input pin
at any given point in time. The STC filtering helps
minimize level shift problems associated with
switching noises or very short spikes on the signal
line. This feature helps ensure a very robust STC
system.
22
When the ac STC operation is used, there must also
be some finite amount of discharge bias current. As
previously described, if the input signal goes below
the 0-V clamp level, the internal loop of the THS7375
sources current to increase the voltage appearing at
the input pin. As the difference between the signal
level and the 0-V reference level increases, the
amount
of
source
current
increases
proportionally—supplying up to 3 mA of current.
Thus, the time period to re-establish the proper STC
voltage can be very short. If the difference is very
small, then the source current is also very small to
account for minor voltage droop.
However, if the input signal goes above the 0-V input
level, a problem arises. The problem is that the video
signal is always above this level and must not be
altered in any way. But if the sync level of the input
signal is above this 0-V level, then the internal
discharge (sink) current reduces the ac-coupled bias
signal to the proper 0-V level.
This discharge current must not be large enough to
alter the video signal appreciably or picture quality
issues may arise. This issue is often seen by looking
at the tilt (droop) of a constant luma signal being
applied and observing the resulting output level. The
associated change in luma level from the beginning
of the video line to the end of the video line is the
amount of line tilt (droop).
If the discharge current is very small, then the amount
of tilt is very low, which is a generally a good thing.
However, the amount of time for the system to
capture the sync signal could be too long. This effect
is also called hum rejection. Hum arises from the ac
line voltage frequency of 50-Hz or 60-Hz. The value
of the discharge current and the ac-coupling capacitor
combine to dictate the hum rejection and the amount
of line tilt.
To allow for both dc-coupling and ac-coupling in the
same part, the THS7375 incorporates an 800-kΩ
resistor to ground. Although a true constant-current
sink is preferred over a resistor, there are significant
issues when the voltage is near ground. This
condition can cause the current sink transistor to
saturate and cause potential problems with the signal.
Also, this resistor is large enough to not impact a
dc-coupled DAC termination. For discharging an
ac-coupled source, Ohm’s Law is applied. If the video
signal is 1 V, then there is 1 V/800 kΩ = 1.25 mA of
discharge current. If more hum rejection is desired or
there is a loss of sync occurring, simply decrease the
0.1-mF input coupling capacitor. A decrease from 0.1
mF to 0.047 mF increases the hum rejection by a
factor of 2:1. Alternatively, an external pull-down
resistor to ground may be added that decreases the
overall resistance and ultimately increases the
discharge current.
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To ensure proper stability of the ac STC control loop,
the source impedance must be less than 1 kΩ with
the input capacitor in place. Otherwise, there is a
possibility for the control loop to ring; this ringing may
appear on the THS7375 output. Because most DACs
or encoders use resistors to establish the voltage,
which are typically less than 500 Ω, meeting the less
than 1-kΩ requirement is easily done. However, if the
source impedance looking from the THS7375 input
perspective is very high, simply adding a 1-kΩ
resistor to GND ensures proper operation of the
THS7375.
(1.6 V – 320 mV)/5.6 = 0.228 V. Thus, the pull-up
resistor calculates to approximately 10.8 MΩ. If the
output dc-bias point is desired to be 1.6 V with a 5-V
power supply, then the value calculates to be
approximately 16.7 MΩ.
INPUT MODE OF OPERATION: AC BIAS
If desired, an external resistor can be placed in
parallel with the internal 800-kΩ resistor. This
external resistor may be required if the pull-up
resistor calculates to a value higher than desired.
There are no consequences of this configuration
other than decreasing the effective input impedance
of the THS7375 system.
Sync-tip clamps are ideal for signals that have
horizontal and/or vertical syncs associated with them.
However, some video signals do not have a sync
embedded within the signal. If ac-coupling of these
signals is desired, then a dc bias is required to
properly set the dc operating point within the
THS7375. This function is easily accomplished with
the THS7375 by simply adding an external pull-up
resistor to the positive power supply, as shown in
Figure 51.
+3.3 V
CIN
0.1 mF
Input
+3.3 V
Internal
Circuitry
RPU
Input
Pin
800 kW
Level
Shift
Figure 51. AC-Bias Input Mode Circuit
Configuration
The dc voltage that appears at the input pin is equal
to Equation 1:
VDC = VS
800 kW
800 kW + RPU
(1)
The THS7375 allowable input range is approximately
(VS+ – 1.5 V), which allows for a very wide input
voltage range but is limited by the allowable output
voltage range and the internal gain. As such, the
input dc bias point is very flexible; the output dc bias
point is the primary factor. For example, if the output
dc bias point is desired to be 1.6 V on a 3.3-V supply,
then the input dc bias point is recommended to be
Keep in mind that the internal 800-kΩ resistor has a
±20% variance. As such, the calculations should take
this variance into account. For the 0.228-V input bias
voltage example above using an ideal 10.8-MΩ
resistor, the input dc bias voltage is about 0.228 V
(±0.045 V) which translates to an output bias voltage
of about 1.6 V (±0.25 V).
The value of the output bias voltage is very flexible
and is left to each individual design. It is important to
ensure that the signal does not clip or saturate the
video signal. Thus, it is recommended to ensure the
output bias voltage is between 0.9 V and (VS+ – 1 V).
For 100% color saturated CVBS or signals with
Macrovision, the CVBS signal can reach up to 1.23
VPP at the input, or 2.46 VPP at the output of the
THS7375. In contrast, other signals are typically 1
VPP or 0.7 VPP at the input which translate to an
output voltage of 2 VPP or 1.4 VPP, respectively. The
output bias voltage must account for a worst-case
situation depending on the signals involved.
One other issue that must be taken into account is
the dc-bias point as a function of the power supply.
As such, there is an impact on the system PSRR. To
help reduce this impact, the input capacitor combines
with the pull-up resistance to function as a low-pass
filter. Additionally, the time to charge the capacitor to
the final dc bias point is also a function of the pull-up
resistor and the input capacitor. Lastly, the input
capacitor forms a high-pass filter with the parallel
impedance of the pull-up resistor and the 800-kΩ
resistor. In general, it is good to have this high-pass
filter at approximately 3-Hz to minimize any potential
droop on a P’B, P’R, or non-sync B’ or R’ signal. A
0.1-mF input capacitor with a 10.8-MΩ pull-up resistor
equates to a 2.1-Hz high-pass corner frequency.
This mode of operation is recommended for use with
chroma (C’), P’B, P’R, U’, V’, and non-sync R'G'B’
signals. This method can also be used with signals
with sync, if desired. The benefit of using the STC
function is that it maintains a constant back-porch
voltage as opposed to a back-porch voltage that
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fluctuates depending on the video content. Because
the corner frequency of the input is a very low 2.5 Hz,
the corner frequency of the input is also a very low
2.5 Hz, which is respectable performance relative to a
STC configuration.
swing and an increase in power dissipation of the
THS7375. While the THS7375 was designed to
operate with a junction temperature of up to +125°C,
care must be taken to ensure that the junction
temperature does not exceed this level; otherwise,
long-term reliability could suffer. Although this
configuration only adds less than 10 mW of power
dissipation per channel, the overall low-power
dissipation of the THS7375 design minimizes
potential thermal issues even when using the TSSOP
package at high ambient temperatures.
OUTPUT MODE OF OPERATION:
DC-COUPLED
The THS7375 incorporates a rail-to-rail output stage
that can be used to drive the line directly without the
need for large ac coupling capacitors, as shown in
Figure 52. This approach offers the best line tilt and
field tilt (or droop) performance because no ac
coupling occurs. Keep in mind that if the input is
ac-coupled, then the resulting tilt because of the input
ac coupling is seen on the output regardless of the
output coupling. The 80-mA output current drive
capability of the THS7375 was designed to drive two
video lines simultaneously (essentially, a 75-Ω load)
while maintaining as wide an output dynamic range
as possible.
Note that the THS7375 can drive the line with dc
coupling regardless of the input mode of operation.
The only requirement is to make sure the video line
has proper termination in series with the
output—typically 75-Ω. This termination helps isolate
capacitive loading effects from the THS7375 output.
Failure to isolate capacitive loads may result in
instabilities with the output buffer, potentially causing
ringing or oscillations to appear. The stray
capacitance appearing directly at the THS7375 output
pins should be kept below 22-pF. The best way to
ensure this limit is maintained is to place the 75-Ω
series output resistor as close as possible to the
output pin. If an output capacitor is used, as
discussed in the next section, then it should be
placed after the resistor.
One concern of dc coupling, however, arises if the
line is terminated to ground. If the ac-bias input
configuration is used, the output of the THS7375 has
a dc bias on the output. With two lines terminated to
ground, this configuration creates a dc current path
that results in a slightly decreased high output voltage
+1.8 V
THS7375
CVBS
R
1
CH1 IN
CH1 OUT 14
2
CH2 IN
CH2 OUT 13
3
CH3 IN
CH3 OUT 12
75 W
Y'/G' Out
75 W
Y'/G'
R
DaVinci
DMxxxx
CVBS/Sync
75 W
P'B/B'
4
CH4 IN
5
GND
6
DISABLE
7
NC
CH4 OUT 11
75 W
VS+ 10
BYPASS
NC
P'B/B' Out
9
75 W
8
R
75 W
P'R/R' Out
P'R/R'
R
75 W
To GPIO Controller
or GND
75 W
+3 V to +5 V
Figure 52. Typical SDTV System with DC-Coupled Line Driving
24
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OUTPUT MODE OF OPERATION:
AC-COUPLED
This configuration helps ensure line-to-line dc
isolation and avoids the potential problems discussed
above. Using a single 1000-mF capacitor for two lines
can be done, but there is a chance for interference to
be created between the two receivers.
A very common method of coupling the video signal
to the line is the use of a large capacitor. This
capacitor is typically between 220 mF and 1000 mF,
although 470 mF is very common. The value of this
capacitor must be large enough to minimize the line
tilt (droop) and/or field tilt associated with ac coupling
as described previously in this document. AC
coupling is done for several reasons, but most often
to ensure full interoperability with the receiving video
system. AC coupling also ensures adherence to video
standard specifications. It ensures that regardless of
the reference dc voltage used on the transmit side,
the receive side re-establishes the dc reference
voltage to its own requirements.
Lastly, because of the edge rates and frequencies of
operation, it is recommended (but not required) to
place a 0.1-mF to 0.01-mF capacitor in parallel with
the large 220-mF to 1000-mF capacitor. These
large-value capacitors are generally aluminum
electrolytic. It is well-known that these capacitors
have significantly large equivalent series resistance
(ESR), and the impedance at high frequencies is
rather large because of the associated inductances
involved with the leads and construction. The small
0.1-mF to 0.01-mF capacitors help pass these
high-frequency (> 1-MHz) signals with much lower
impedance than the large capacitors.
As with the dc output mode of operation discussed
previously, each line should have a 75-Ω source
termination resistor in series with the ac coupling
capacitor. If two lines are to be driven, it is best to
have each line use its own capacitor and resistor
rather than sharing these components, as shown in
Figure 53.
Although it is common to use the same capacitor
values for all the video lines, the frequency bandwidth
of the chroma signal in a S-Video system are not
required to go as low (or as high of a frequency) as
the luma channels. Thus, the capacitor values of the
chroma line(s) can be smaller, such as 0.1 mF.
+3.3 V
THS7375
(1)
0.1 mF
CVBS
R
(1)
Y'/G'
+3.3 V
R
(1)
RPU
P'B/B'
CH2 IN
CH2 OUT 13
3
CH3 IN
CH3 OUT 12
4
CH4 IN
CH4 OUT 11
5
GND
6
DISABLE
7
NC
75 W
75 W
(2)
CVBS Out 1
330 mF
75 W
VS+ 10
BYPASS
9
NC
8
Y'/G' Out
75 W
(2)
330 mF
+
0.1 mF
CH1 IN
2
+3.3 V
R
(1)
0.1 mF
RPU
R
75 W
Y' Out 1
(2)
330 mF
+
75 W
P'R/R'
CVBS/Sync
+
0.1 mF
DAC/Encoder
SDTV
CVBS
S-Video
Y'P'BP'R
R'G'B'
1
(2)
330 mF
+
75 W
CH1 OUT 14
75 W
To GPIO Controller
or GND
75 W
P’B/B' Out
75 W
P'B Out 1
(2)
330 mF
+
75 W
(2)
330 mF
+
+3 V to +5 V
75 W
(2)
75 W
P'R Out 1
330 mF
+
75 W
P’R/R' Out
330 mF
+
75 W
(2)
75 W
(1) An ac-coupled input is shown in this example. DC coupling is also allowed as long as the DAC output voltage is within the allowable
linear input and output voltage range of the THS7375. To dc-couple, remove the 0.1-mF input capacitors and RPU.
(2) An ac-coupled output is shown in this example. DC coupling is also allowed by simply removing these capacitors.
Figure 53. Typical SDTV AC-Input System Driving Two AC-Coupled Video Lines
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LOW-PASS FILTER
Each channel of the THS7375 incorporates a
sixth-order low-pass filter. These video reconstruction
filters minimize the passing of DAC images to the
video receiver. Depending on the receiver design,
failure to eliminate these DAC images can cause
picture quality problems as a result of ADC aliasing.
Another benefit of the filter is to smooth out
aberrations in the signal that some DACs can have if
the internal device filtering is not very good. This
technique helps with picture quality and helps ensure
that the signal meets video bandwidth requirements.
Each filter has an associated Butterworth
characteristic. The benefit of the Butterworth
response is that the frequency response is flat, with a
relatively steep initial attenuation at the corner
frequency. The problem with this characteristic is that
the group delay rises near the corner frequency.
Group delay is defined as the change in phase
(radians/second) divided by a change in frequency.
An increase in group delay corresponds to a time
domain pulse response that has overshoot and some
possible ringing associated with the overshoot.
The use of other type of filters, such as elliptic or
chebyshev, are not recommended for video
applications because of the very large group delay
variations near the corner frequency that results in
significant overshoot and ringing. While these elliptic
or chebyshev filters may help meet the video
standard specifications with respect to amplitude
attenuation, the group delay is well beyond the
standard specifications. When considering these filter
types, keep in mind that video can go from a white
pixel to a black pixel over and over again, and ringing
can easily occur. Ringing typically causes a display to
have ghosting or fuzziness appear on the edges of a
sharp transition. On the other hand, a Bessel filter
has ideal group delay response, but the rate of
attenuation is typically too slow for acceptable image
rejection. Thus, the Butterworth filter is a respectable
compromise for both attenuation and group delay.
The THS7375 filters have a nominal corner (–3 dB)
frequency at 9.5 MHz and a –1-dB passband typically
at 8 MHz. This 9.5-MHz filter is ideal for standard
definition (SD) NTSC, PAL, and SECAM composite
video (CVBS) signals. It is also useful for s-video
signals (Y'C'), 480i/576i Y'P'BP'R, Y'U'V', broadcast
G'B'R' (R'G'B') signals, and computer video signals.
The 9.5-MHz, –3-dB corner frequency was designed
to achieve 54 dB of attenuation at 27 MHz—a
common sampling frequency between the DAC/ADC
second and third Nyquist zones found in many video
systems. This consideration is important because any
signal that appears around this frequency can also
appear in the baseband as the result of aliasing
effects of an ADC found in a receiver.
26
Keep in mind that images do not stop at the DAC
sampling frequency, fS (for example, 27 MHz for
traditional SD DACs); they continue around the
sampling frequencies of 2X fS, 3X fS, 4X fS, etc. (54
MHz, 81 MHz, 108 MHz). Because of these multiple
images that an ADC can fold down into the baseband
signal, the low-pass filter must also eliminate these
higher order images. The THS7375 filters are
Butterworth filters and as such, do not bounce at
higher frequencies and maintain good attenuation
performance.
The 9.5-MHz filter frequency was chosen to account
for process variations in the THS7375. To ensure that
the required video frequencies are effectively passed,
the filter corner frequency must be high enough to
allow component variations. The other consideration
is that the attenuation must be large enough to
ensure the anti-aliasing/reconstruction filtering is
adequate to meet the system demands. Thus, the
filter frequencies were not arbitrarily selected and are
a good compromise that should meet the demands of
most systems.
Benefits Over Passive Filtering
Two key benefits of using an integrated filter system
such as the THS7375 over a passive system are
PCB area and filter variations. The small TSSOP-14
package for four video channels is much smaller over
a passive RLC network, especially a six-pole passive
network. Additionally, consider that inductors have at
best ±10% tolerances (normally ±15% to ±20% are
common) and capacitors typically have ±10%
tolerances. Using a Monte Carlo analysis shows that
the filter corner frequency (–3 dB), flatness (–1 dB), Q
factor (or peaking), and channel-to-channel delay
have wide variations. This approach can lead to
potential performance and quality issues in
mass-production environments. The THS7375 solves
most of these problems with the corner frequency
being essentially the only variable.
Another concern about passive filters is the use of
inductors. Inductors are magnetic components and
are therefore susceptible to electromagnetic
coupling/interference (EMC/EMI). Some common
coupling can occur because of other nearby video
channels that use inductors for filtering, or it can
come from nearby switched-mode power supplies.
Some other forms of coupling could be from outside
sources with strong EMI radiation that can cause
failure in EMC testing such as required for CE
compliance.
One concern about an active filter in an integrated
circuit is the variation of the filter characteristics when
the ambient temperature and the subsequent die
temperature change. To minimize temperature
effects, the THS7375 uses low temperature
coefficient resistors and high-quality/low-temperature
coefficient capacitors found in the BiCom3X process.
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These filters have been specified by design to
account for process and temperature variations to
maintain proper filter characteristics. This architecture
maintains a low channel-to-channel time delay, which
is required for proper video signal performance.
Another benefit of the THS7375 over a passive RLC
filter is the input and output impedance. The input
impedance presented to the DAC may vary
significantly with a passive network and may cause
voltage variations over frequency. The THS7375
input impedance is 800 kΩ, and only the 2-pF input
capacitance plus the PCB trace capacitance impacts
the input impedance. As such, the voltage variation
appearing at the DAC output is better controlled with
a fixed termination resistor and the high input
impedance buffer of the THS7375.
On the output side of the filter, a passive filter also
has a large impedance variation over frequency. The
EIA770 specifications requires the return loss be at
least 25 dB over the video frequency range of usage.
For a video system, this condition implies the source
impedance—which includes the source and the
series resistor and the filter—must be better than 75
+9/–8 Ω. The THS7375 is an operational amplifier
that approximates an ideal voltage source. A voltage
source is desirable because the output impedance is
very low and can source and sink current. To properly
match the transmission line characteristic impedance
of a video line, a 75-Ω series resistor is placed on the
output. To minimize reflections and to maintain a
good return loss, this output resistance must maintain
a 75-Ω impedance. A passive filter impedance
variation cannot ensure this consistent performance
while the THS7375 has about 1.4-Ω of output
impedance at 5-MHz. Thus, the system is much
better matched with a THS7375 as compared to a
passive filter.
One final advantage of the THS7375 over a passive
filter is power dissipation. A DAC driving a video line
must be able to drive a 37.5-Ω load—the receiver
75-Ω resistor and the 75-Ω source impedance
matching resistor next to the DAC to maintain the
source impedance requirement. This approach forces
the DAC to drive at least 1.25 VP (100% saturation
CVBS)/37.5 Ω = 33.3 mA. A DAC is a current
steering element and this amount of current flows
internally to the DAC even if the output is 0 V. Thus,
power dissipation in the DAC may be very high,
especially when four channels are being driven. With
a high input impedance and the capability to drive up
to two video lines, utilizing the THS7375 can reduce
the DAC power dissipation significantly. This
reduction occurs because the resistance the DAC is
driving can be substantially increased. It is common
to set this driving resistance in a DAC by a
current-setting resistor on the device. Thus, the
resistance can be 300 Ω or more, substantially
reducing the current drive demands from the DAC
and saving a substantial amount of power. For
example, a 3.3-V four-channel DAC dissipates 440
mW for the steering current capability alone (four
channels × 33.3 mA × 3.3 V) if it must drive a 37.5-Ω
load. With a 300-Ω load, the DAC power dissipation
as a result of current steering current would only be
55 mW (four channels × 4.16 mA × 3.3 V).
Reducing System Gain
The THS7375 has a built-in gain of 5.6 V/V, or 14.95
dB. While this gain matches the needs of many of
Texas Instruments' video processors, including the
DaVinci family of products, the gain can be easily
reduced to meet other needs. The easiest and most
effective method of adjusting the gain lower is to
simply use a resistor divider on the input to the
THS7375, as shown in Figure 54. This solution uses
resistors R1 and R2 to accomplish two requirements:
1. Terminate the video DAC with the proper
resistance, and
2. Form a resistor divider in before the THS7375
input.
VINPUT
0.44 VPP
2.46 VPP
1.23 VPP
Video Out
R1
21.5 W
75 W
5.6 V/V
DAC
R2
53.6 W
VDAC
0.615 VPP
100% Saturated CVBS
75 W
THS7375
Figure 54. Configuring the THS7375 with 4-V/V (12dB) Gain
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THS7375
SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
www.ti.com
The DAC must have a defined termination resistance
to properly set the output voltage. R1 and R2 sum
together to accomplish this requirement such that R1
+ R2 = DAC termination resistance.
•
•
•
The voltage divider, formed by R1 and R2, also
creates a voltage divider that reduces the signal
voltage appearing at the THS7375 input terminal. The
voltage appearing at the THS7375 input is equal to
VDAC R2/(R1 + R2).
As an example, the DAC outputs 0.615 VPP and
requires an amplifier gain of 4 V/V (12dB) to achieve
100% saturated color CVBS signal requirements.
Additionally, the DAC requires a termination
resistance of 75 Ω. Plugging these requirements into
the above equations result in standard resistor values
of R2 = 53.6 Ω and R1 = 21.5 Ω.
Solving for both of these requirements and simplifying
results leads to the general equations:
• DAC termination = RTERM = R1 + R2
• VINPUT = VDAC R2/(R1 + R2)
Ratio = VINPUT/VDAC
R2 = RTERM × Ratio
R1 = RTERM – R2
EVALUATION MODULE
To evaluate the THS7375, a product evaluation
module (EVM) is available. The EVM allows for
testing the THS7375 in many different cnfiguration.
Inputs and outputs include BNC connectors
commonly found in video systems along with 75-Ω
input termination resistors, 75-Ω series source
termination resistors, and 75-Ω characteristic
impedance traces. Several unpopulated component
pads are found on the EVM to allow for different input
and output configurations as dictated by the user.
This EVM is designed to be used with a single-supply
from 2.85 V up to 5 V.
The EVM default input configuration sets all channels
for dc input coupling. The input signal must be within
0 V to about 0.52 V for proper operation with 3.3 V
supply and up to 0.8 V for 5V supply. Failure to be
within this range saturates and/or clips the output
signal. If the input range is beyond this range, or if
the signal voltage is unknown, or coming from a
current sink DAC, then ac input configuration is
desireable. This option is easily accomplished with
the EVM by simply replacing Z1, Z2, Z3, and Z4 0-Ω
resistors with 0.1-mF capacitors.
For ac-coupled input and sync-tip clamp (STC)
functionality commonly used for CVBS, s-video Y',
component Y' signals, and R'G'B' signals with
embedded sync, then no other changes are needed.
However, if a bias voltage is needed after the input
capacitor which is commonly needed for s-video C',
component P'B and P'R, and non-sync embedded
R'G'B' signals, then a pull-up resistor should be
added to the signal on the EVM. This adjustment is
28
easily done by simply adding a resistor to any of the
following resistor pads; RX1, RX3, RX5, or RX7. A
common value to use is 10.8 MΩ. Note that even
signals with embedded sync can also use bias mode
if desired.
The EVM default output configuration sets all
channels for ac output coupling. The 470-mF and
0.1-mF capacitors work well for most ac-coupled
systems. However, if dc-coupled output is desired,
then replacing the 0.1-mF capacitors—C12, C14, C16,
and C17—with 0-Ω resistors works well. Removing
the 470-mF capacitors is optional, but removing them
from the EVM eliminates a few picofarads of stray
capacitance on each signal path which may be
desirable.
The THS7375EVM incorporates an easy method to
configure the bypass mode and the disable mode.
The use of JP1 controls the disable feature while JP4
controls the bypass feature. While there is a space on
the EVM board for JP2 and JP3, these are not
utilized for the THS7375. Connection of JP1 to GND
applies 0 V to the disable pin and the THS7375
operates normally. Moving JP1 to +VS causes the
THS7375 to be in disable mode. Connection of JP4
to GND places the THS7375 in filter mode while
moving JP4 to +VS places the THS7375 in bypass
mode.
Figure 55 shows the THS7375EVM schematic.
Figure 56 and Figure 57 illustrate the two layers of
the EVM PCB, incorporating standard high-speed
layout practices. Table 2 lists the bill of materials as
supplied from Texas Instruments.
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Figure 55. THS7375 EVM Schematic
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THS7375
SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
www.ti.com
TEXAS INSTRUMENTS
THS7375IPW EVM
EDGE # 6502996
REV. A
Figure 56. THS7375 EVM PCB Top Layer
30
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Figure 57. THS7375 EVM PCB Bottom Layer
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THS7375
SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
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THS7375EVM Bill of Materials
Table 2. THS7375 EVM
32
ITEM
REF DES
QTY
DESCRIPTION
1
FB1
1
Bead, Ferrite, 2.5 A, 330 Ω
SMD SIZE
0805
MANUFACTURER
PART NUMBER
DISTRIBUTOR
PART NUMBER
(TDK) MPZ2012S331A
(Digi-Key) 445-1569-1-ND
(AVX) TPSC107K010R0100
(Digi-Key) 478-1765-1-ND
2
C24
1
Capacitor, 100 mF, Tantalum, 10 V, 10%,
Low-ESR
3
C1–C4,
C7–C10, C19,
C20–C22
12
Open
0805
4
C5
1
Capacitor, 0.01 mF, Ceramic, 100 V, X7R
0805
(AVX) 08051C103KAT2A
(Digi-Key) 478-1358-1-ND
5
C12, C14, C16,
C17, C23, C25,
C26
7
Capacitor, 0.1 mF, Ceramic, 50 V, X7R
0805
(AVX) 08055C104KAT2A
(Digi-Key) 478-1395-1-ND
6
C6
1
Capacitor, 1 mF, Ceramic, 16 V, X7R
0805
(TDK) C2012X7R1C105K
(Digi-Key) 445-1358-1-ND
7
C11, C13, C15,
C18
4
Capacitor, Aluminum, 470 mF, 10 V, 20%
(Cornell) AFK477M10F24B-F
(Newark) 66K0965
8
RX1–RX8
8
Open
0603
9
R6, R7, R14,
R15
4
Open
0805
10
Z1–Z4
4
Resistor, 0 Ω
0805
(ROHM) MCR10EZHJ000
(Digi-Key) RHM0.0ACT-ND
11
R1–R4,
R9–R12
8
Resistor, 75 Ω, 1/8 W, 1%
0805
(ROHM) MCR10EZHF75.0
(Digi-Key)
RHM75.0CCT-ND
12
R17
1
Resistor, 100 Ω, 1/8 W, 1%
0805
(ROHM) MCR10EZHF1000
(Digi-Key)
RHM100CCT-ND
13
R13, R16
2
Resistor, 1 kΩ, 1/8 W, 1%
0805
(ROHM) MCR10EZHF1001
(Digi-Key)
RHM1.00KCCT-ND
14
R5, R8
2
Resistor, 100 kΩ, 1/8 W, 1%
0805
(ROHM) MCR10EZHF1003
(Digi-Key)
RHM100KCCT-ND
15
J9, J10
2
Jack, Banana Receptance, 0.25" dia. hole
(SPC) 813
(Newark) 39N867
16
J1–J8
8
Connector, BNC, Jack, 75 Ω
(Amphenol) 31-5329-72RFX
(Newark) 93F7554
17
TP5, TP6
2
Test Point, Black
(Keystone) 5001
(Digi-Key) 5001K-ND
18
JP2, JP3
2
Open
3 possible
19
JP1, JP4
2
Header, 0.1" CTRS, 0.025" sq. pins
3 possible
(Sullins) PBC36SAAN
(Digi-Key) S1011E-36-ND
20
JP1, JP4
2
Shunts
(Sullins) SSC02SYAN
(Digi-Key) S9002-ND
21
U1
1
IC, THS7375
22
4
Standoff, 4-40 HEX, 0.625" length
(Keystone) 1808
(Digi-Key) 1808K-ND
23
4
Screw, Phillips, 4-40, 0.250"
(BF) PMS 440 0031 PH
(Digi-Key) H343-ND
24
1
Printed Circuit Board
(TI) Edge# 6502996 Rev. A
C
F
PW
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SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (September 2008) to Revision A
Page
•
Added Figure 26 ................................................................................................................................................................. 13
•
Added Figure 45 ................................................................................................................................................................. 17
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THS7375
SBOS449A – SEPTEMBER 2008 – REVISED JANUARY 2011
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EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have
electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling
(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER
AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or
services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or
safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.
FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio
frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are
designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may
be required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.85 V to 5.5 V single supply and the output voltage range of 0 V to 5.5
V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +85°C. The EVM is designed to operate
properly with certain components above +85°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2009, Texas Instruments Incorporated
34
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PACKAGE OPTION ADDENDUM
www.ti.com
10-Jun-2014
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
THS7375IPW
ACTIVE
TSSOP
PW
14
90
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
-40 to 85
THS7375
THS7375IPWR
ACTIVE
TSSOP
PW
14
2000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
-40 to 85
THS7375
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
10-Jun-2014
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
14-Jul-2012
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
THS7375IPWR
Package Package Pins
Type Drawing
TSSOP
PW
14
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
2000
330.0
12.4
Pack Materials-Page 1
6.9
B0
(mm)
K0
(mm)
P1
(mm)
5.6
1.6
8.0
W
Pin1
(mm) Quadrant
12.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
14-Jul-2012
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
THS7375IPWR
TSSOP
PW
14
2000
367.0
367.0
35.0
Pack Materials-Page 2
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