ETC SGM9123

SGM9123
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
GENERAL DESCRIPTION
FEATURES
SGM9123 is a video buffer which integrates triple 6dB
• Triple 3rd Order 8MHz (SD) Filters
Gain rail-to-rail output driver and triple 3rd output
• Transparent Input Clamping
reconstruction filter, it has 8MHz -3dB bandwidth and
• 6dB Output Driver Gain and Drive Dual Video Load
44V/µs slew rate. SGM9123 provides improved image
• Rail-to-Rail Output
quality compared with passive LC filters and discrete
• Input Voltage Range Includes Ground
drivers solution. Operating from single supplies ranging
• AC or DC Coupled Inputs
from +2.5V to +5.5V and sinking an ultra-low 7.4mA
• AC or DC Coupled Outputs
quiescent current, the SGM9123 is ideally suited for
• Operates from 2.5V to 5.5V Single Power Supply
battery powered applications.
• Low Power (2.5mA/Channel)
7.4mA Total Supply Current
SGM9123 can be DC-coupled or AC-coupled with input
• Lead (Pb) Free SO-8 Package
video signal, such as the output stage of DAC to
eliminate out-of-band noise. Internal diode clamps and
bias circuitry may be used if AC-coupled inputs are
APPLICATIONS
required. SGM9123 also integrates an internal level
Video Amplifiers
shift circuit which avoids sync-pulse being clipped and
Cable and Satellite Set Top Boxes
allows DC-coupled output. The drivers in SGM9123
Communications Devices
can drive DC or AC-coupled single (150Ω) or dual (75
Video on Demand
Ω) loads.
Portable and Handheld Products
Personal Video Recorders
The SGM9123 has lead (Pb) free SO-8 package and
DVD Players
ESD (HBM) reaches 8KV.
SDTVs
BLOCK DIAGRAM
IN1
Transparent Clamp
6 dB
OUT1
6 dB
OUT2
6 dB
OUT3
8MHz, 3rd order
IN2
IN3
SG Micro Limited
www.sg-micro.com
Transparent Clamp
Transparent Clamp
8MHz, 3rd order
8MHz, 3rd order
REV. A
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
SGM9123
PACKAGE/ORDERING INFORMATION
ORDER NUMBER
PACKAGE
DESCRIPTION
TEMPERATURE
RANGE
PACKAGE
OPTION
MARKING
INFORMATION
SGM9123XS/TR
SO-8
-40℃ to +125℃
Tape and Reel, 2500
SGM9123XS
PIN CONFIGURATION (Top View)
SGM9123XS
IN1
1
8
OUT1
IN2
2
7
OUT2
IN3
3
6
OUT3
+VS
4
5
GND
SO-8
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
NAME
IN1
IN2
IN3
+VS
GND
OUT3
OUT2
OUT1
FUNCTION
Video input, channel 1
Video input, channel 2
Video input, channel 3
Power supply
Ground
Filtered output, channel 3
Filtered output, channel 2
Filtered output, channel 1
ABSOLUTE MAXIMUM RATINGS
CAUTION
Supply Voltage, V+ to V- ............................................... 6.5V
Input Voltage.............................. GND - 0.3 V to (+VS) +0.3V
Storage Temperature Range.......................–65℃ to +150℃
Junction Temperature ................................................. 160℃
Operating Temperature Range .................. –40℃ to +125℃
Power Dissipation, PD @ TA = 25℃
SO-8 .............................................................................0.8W
Package Thermal Resistance
SO-8, θJA................................................................. 125℃/W
Lead Temperature Range (Soldering 10sec)
.................................................................................... 260℃
ESD Susceptibility
HBM.............................................................................8000V
MM.................................................................................400V
This integrated circuit can be damaged by ESD. SGMICRO
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.
NOTES
1. Stresses above those listed under Absolute Maximum
Ratings may cause permanent damage to the device. This is
a stress rating only; functional operation of the device at
these or any other conditions above those indicated in the
operational section of this specification is not implied.
Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
SG Micro Limited
www.sg-micro.com
2
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
SGM9123
ELECTRICAL CHARACTERISTICS: VS = +5.0V
(At RL = 150Ω connected to GND, VIN = 1Vpp，and CIN = 0.1µF, all outputs AC coupled with 220µF，unless otherwise noted)
SGM9123
PARAMETER
CONDITIONS
TYP
MIN/MAX OVER TEMPERATURE
+25℃
+25℃
0℃
-40℃
to +70℃
to +85℃
MIN/
UNITS MAX
INPUT CHARACTERISTICS
Output Level Shift Voltage (VOLS)
VIN = 0V, no load
258
419
423
440
mV
MAX
Input Voltage Clamp (VCLAMP)
IIN = -1mA
-13
-27
-27.6
-28.7
mV
MIN
Clamp Charge Current
VIN = VCLAMP -100mV
-5.60
-8.2
-8.23
-8.24
mA
MIN
Voltage Gain ( AV)
RL = 150Ω
2.0
1.89
1.88
1.87
V/V
MIN
2.07
2.08
2.09
V/V
MAX
OUTPUT CHARACTERISTICS
Output Voltage High Swing
VIN = 3V, RL = 150Ω to GND
4.42
4.15
4.13
4.12
V
MIN
Output Short-Circuit Current (ISC)
VIN = 3V, to GND through 10Ω
110
68
65
63
mA
MIN
VIN = 100mV, out short to VDD through 10Ω
162
102
92
90
mA
MIN
2.5
2.7
2.7
V
MIN
5.5
5.5
5.5
V
MAX
POWER SUPPLY
Operating Voltage Range
Power Supply Rejection Ratio (PSRR)
Vs = +2.7V to + 5.5V
66
51
48
46
dB
MIN
Quiescent Current (IQ)
VIN = 500mV,
7.4
9.5
10.5
10.7
mA
MAX
±0.1dB Bandwidth
RL = 150Ω
5.4
MHz
TYP
-3dB Bandwidth
RL = 150Ω
8.0
MHz
TYP
Normalized Gain: fIN = 4.5MHz
+0.2
dB
TYP
fIN = 27MHz
-25
dB
TYP
DYNAMIC PERFORMANCE
Filter Response
Slew Rate
20% to 80%, VIN = 1V Step,
44
V/µs
TYP
Differential Gain (DG)
NTSC & PAL DC coupled
0.2
%
TYP
NTSC & PAL AC coupled
0.52
%
TYP
NTSC & PAL DC coupled
0.4
°
TYP
NTSC & PAL AC coupled
1.0
°
TYP
Group Delay Variation (D/DT)
f = 400KHz, 6.5MHz
17.5
ns
TYP
Crosstalk (channel - to - channel)
at 1MHz
-64
dB
TYP
Fall Time
2.0VSTEP, 80% to 20%
36
ns
TYP
Rise Time
2.0VSTEP, 80% to 20%
38
ns
TYP
Differential Phase (DP)
Specifications subject to changes without notice.
SG Micro Limited
www.sg-micro.com
3
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
SGM9123
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +5.0V, TA = +25℃, RL = 150Ω, all outputs AC coupled with 220µF, unless otherwise noted.
Phase vs. Frequency
270
0
180
Phase (degree)
Normalized Gain (dB)
Frequency Response
3
-3
-6
-9
-12
-15
0.01
90
0
-90
-180
-270
0.1
1
10
Frequency (MHz)
100
0.1
0.5
0.2
Output Voltage (V)
Output Voltage (V)
0.3
0.25
0
-0.25
-0.5
0
-0.1
-0.2
PSRR vs. Frequency (No Bypass Caps)
PSRR vs. Frequency (Bypass Caps)
0
-40
-45
-10
-50
-55
-20
PSRR (dB)
PSRR (dB)
0.1
-0.3
-0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5
Time (µs)
0.1 0.2 0.3 0.4 0.5
Time (µs)
-60
-65
-70
-75
-30
-40
-50
-60
-80
-70
-85
-90
0.01
100
Small Signal Step Response
Large Signal Step Response
0.75
-0.75
-0.5 -0.4 -0.3 -0.2 -0.1 0
1
10
Frequency (MHz)
0.1
1
Frequency (MHz)
SG Micro Limited
www.sg-micro.com
10
100
-80
0.01
0.1
1
Frequency (MHz)
10
100
4
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
SGM9123
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +5.0V, TA = +25℃, RL = 150Ω, all outputs AC coupled with 220µF, unless otherwise noted.
Gain Error vs. Temperature
Quiescent Current vs. Supply Voltage
2
9
1.8
8.5
Quiescent Current (mA)
Gain Error (%)
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
8
7.5
7
6.5
6
5.5
5
4.5
4
-40
-15
10
35
60
85
110
2.5
3
Temperature (℃)
Quiescent Current (mA)
Group Delay (ns)
45
40
35
30
25
20
15
0.1
1
Frequency (MHz)
5.5
12
11
10
9
8
7
6
5
4
3
2
-40
10
Output Voltage Swing to The Negative Rail vs.
Output Current
-15
10
35
60
Temperature (℃)
85
110
Output Voltage Swing to The Positive Rail vs.
Output Current
1.2
5
1
4.75
-40℃
0.8
Output Voltage (v)
Output Voltage (v)
5
Quiescent Current vs. Temperature
Group Delay vs. Frequency
50
10
0.01
3.5
4
4.5
Supply Voltage (V)
+25℃
0.6
+85℃
0.4
0.2
4.5
4.25
4
+85℃
3.75
3.5
+25℃
3.25
-40℃
3
0
0
20
40
60
Output Current (mA)
SG Micro Limited
www.sg-micro.com
80
100
0
20
40
60
Output Current (mA)
80
100
5
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
SGM9123
APPLICATIONS INFORMATION
Functional Description
Power-Supply Bypassing and Layout
SGM9123 operates from a single +2.5V to +5V supply. In
application, SGM9123 is a fully integrated solution for filtering
and buffering SDTV signals in front of video decoder or
behind video encoder. For example, SGM9123 can replace
three passive LC filters and three amplifier drivers at CVBS
and S-video output side in set-top box and DVD player, this
solution can help you save PCB size and production cost, it
also improves video signal performance comparing with
traditional design using discrete components. SGM9123
features a DC-coupled input buffer, 3-pole low-pass filter to
eliminate out-of-band noise of video encoder, and a gain of
+6dB in the output amplifier to drive 75Ω load. The AC or
DC-coupled input buffer eliminates sync crush, droop, and
field tilt. The output of SGM9123 also can be DC-coupled or
AC-coupled.
Correct power supply bypassing is very important for optimizing
video performance in design. One 0.1µF and one 10µF
capacitors are always used to Bypass VCC pin of SGM9123,
please place these two capacitors as close to the SGM9123
output pin as possible, a large ground plane is also needed to
ensure optimum performance. The input and output termination
resistors should be placed as close to the related pin of
SGM9123 as possible to avoid performance degradation. The
PCB traces at the output side should have 75Ω characteristic
impedance in order to match the 75Ω characteristic impedance
cable connecting external load. In design, please keep the
board trace at the inputs and outputs of the SGM9123 as short
as possible to minimize the parasitic stray capacitance and
noise pickup.
Input Considerations
Besides AC coupling, the SGM9123 inputs also can be
DC-coupled. In DC coupling application, No input coupling
capacitors are needed because the amplitude of input video
signal from DAC includes ground and extends up to 1.4V,
then SGM9123 can be directly connected to the output of a
single-supply, current-output DAC without any external bias
network. Some time, if DAC’s output level exceeds the range
of 0V to 1.4V, or SGM9123 is driven by an unknown external
source or a SCART switch which has its own clamping circuit,
AC coupling is needed in such applications.
Output Considerations
The SGM9123 outputs can be DC-coupled or AC-coupled.
When 0V is input, the SGM9123 output voltage is 260mV
typically. In DC coupling design, one 75Ω resistor is used to
Connect SGM9123’s output pin with external load directly,
this serial back-termination resistor is used to match the
impedance of the transmission line between SGM9123 and
external load to cancel the signal reflection. The SGM9123
outputs can sink and source current allowing the device to be
AC-coupled with external load, in AC coupling, 220µF at
least capacitor will be used in order to eliminate field tilt.
Typical Application Diagram
The following schematic in Figure 3 is normally used for AC
coupled output and DC-coupled input with DAC which has an
output voltage range of 0V to 1.4V. AC coupled output offer
slightly lower power dissipation and high ESD protection ability.
The schematics in Figure 1 and Figure 2 are also popular in
design. Figure 4 is a kind of special application in STB.
+5V
0.1µF
or 0.01µF
10µF
4
+VS
1
CVBS1
IN1
OUT1
8
CVBS1
75Ω
75Ω
SGM9123
2
Y
IN2
OUT2
7
75Ω
S-Video
S-Video
3
C
Y
75Ω
IN3
OUT3
6
C
75Ω
75Ω
GND
5
Figure 1. DC Coupling Application Schematic
SG Micro Limited
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6
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
SGM9123
+5V
0.1µF
or 0.01µF
+5V
0.1µF
or 0.01µF
10µF
4
+VS
4
0.1µF
CVBS1
+VS
1
IN1
OUT1
CVBS1
75Ω
220µF
SGM9123
0.1µF
Y
IN2
OUT2
7
Y
75Ω
S-Video
0.1µF
C
IN3
OUT3
6
75Ω
CVBS1
75Ω
220µF
IN2
OUT2
75Ω
220µF
7
Y
IN3
OUT3
6
C
75Ω
C
75Ω
220µF
220µF
GND
5
GND
75Ω
8
S-Video
3
C
3
OUT1
75Ω
S-Video
220µF
IN1
SGM9123
2
Y
2
75Ω
SVideo
1
CVBS1
8
75Ω
75Ω
10µF
5
Figure 3. Input DC Coupling and Output AC
Coupling Application Schematic
Figure 2. AC Coupling Application Schematic
0.1µF
or 0.01µF
10µF
VCC
4
to Loading 1
+VS
Y
1
75Ω
SOC
Of
STB
Pb
OUT1
IN1
8
A
75Ω
220µF
75Ω
220µF
75Ω
220µF
75Ω
220µF
75Ω
220µF
to Loading 2
to Loading 1
7
OUT2
B
IN2
75Ω
to Loading 2
The three ports of A ,B and C
should be immediate as signal
output pin in layout
to Loading 1
3
75Ω
220µF
SGM9123
2
Pr
75Ω
IN3
OUT3
6
C
to Loading 2
GND
5
Figure 4. Input DC Coupling and Output AC Coupling Application Schematic in STB
SG Micro Limited
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7
Triple, 8MHz, 3rd Order
SDTV Video Filter Drivers
SGM9123
PACKAGE OUTLINE DIMENSIONS
SO-8
D
C
Symbol
E
E1
Min
Max
Min
Max
1.350
1.750
0.053
0.069
A1
0.100
0.250
0.004
0.010
A2
1.350
1.550
0.053
0.061
B
0.330
0.510
0.013
0.020
C
0.190
0.250
0.007
0.010
D
4.780
5.000
0.188
0.197
E
3.800
4.000
0.150
0.157
E1
5.800
6.300
0.228
0.248
e
1.270TYP
0.050TYP
L
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
A
A2
B
A1
e
Dimensions
In Inches
A
L
θ
Dimensions
In Millimeters
01/2008 REV. A
SGMICRO is dedicated to provide high quality and high performance analog IC products to customers. All SGMICRO products
meet the highest industry standards with strict and comprehensive test and quality control systems to achieve world-class
consistency and reliability.
For information regarding SGMICRO Corporation and its products, see www.sg-micro.com
SG Micro Limited
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8