STMICROELECTRONICS TSH173IDT

TSH173
Triple video buffer with filter for SD video
Features
■
4.5V to 5.5V single supply operation
■
R-G-B, Y-Pb-Pr, Y-C-CVBS driving
■
3 channels with 6dB gain buffer
■
3 video reconstruction filters for SD
■
3 internal input DC level shifter
■
No input capacitor is required
■
Very low harmonic distortion
■
Each output can drive AC- or DC-coupled
150Ω loads
■
Tested on 5V power supply
■
Data min. and max. are tested during
production
Pin connections (top view)
IN1 1
8.2MHz
5th order
6dB
8 OUT1
IN2 2
8.2MHz
5th order
6dB
7 OUT2
IN3 3
8.2MHz
5th order
6dB
6 OUT3
Applications
■
Set top boxes
■
DVD players/recorders
■
High-end video systems
■
Standard definition TV (SD)
■
Multimedia products
DC Shifter
5 GND
+Vcc 4
SO8
Description
The TSH173 is a single supply triple video buffer
featuring an internal gain of 6dB and an internal
low pass filter of 8.2MHz cut-off frequency for
each channel to fit with Standard Definition
requirements for video line interfaces.
This datasheet gives technical information on
using the TSH173 as a R-G-B, Y-Pb-Pr, or Y-CCVBS driver for video DAC outputs on a video line.
The TSH173 is available in SO8 plastic package.
Another advantage of the TSH173 is its input DC
level shifter to drive the video signal on a 75Ω
video line without any damage to the
synchronization tip, while using a single 5V power
supply with no input capacitor. The DC level
shifter is internally fixed and optimized to keep the
output video signal between low and high output
rails in the best position to improve linearity.
March 2007
Rev 1
1/13
www.st.com
13
Contents
TSH173
Contents
1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1
Synchronization tip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2
Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Using the TSH173 to drive video components . . . . . . . . . . . . . . . . . . . 10
5
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13
TSH173
1
Absolute maximum ratings
Absolute maximum ratings
Table 1.
Absolute maximum ratings
Symbol
VCC
Parameter
Value
Unit
6
V
Supply voltage (1)
Toper
Operating free air temperature range
-40 to +85
°C
Tstg
Storage temperature
-65 to +150
°C
Maximum junction temperature
150
°C
Rthjc
SO8 thermal resistance junction to case
28
°C/W
Rthja
SO8 thermal resistance junction to ambient area
157
°C/W
Pmax.
Maximum power dissipation (@Tamb=25°C) for
Tj=150°C
800
mW
ESD
CDM: charged device model
HBM: human body model
MM: machine model
1.5
2
200
kV
kV
V
Tj
Output short-circuit
(2)
1. All voltage values, except differential voltage, are with respect to network terminal.
2. An output current limitation protects the circuit from transient currents. Short-circuits can cause excessive
heating. Destructive dissipation can result from short-circuits on amplifiers.
2
Operating conditions
Table 2.
Symbol
VCC
Operating conditions
Parameter
Power supply voltage
Value
Unit
4.5 to 5.5(1)
V
1. Tested in full production at 0V/5V single power supply.
3/13
Electrical characteristics
TSH173
3
Electrical characteristics
Table 3.
VCC = +5V single supply, load: RL = 150Ω, Tamb = 25°C (unless otherwise specified)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
0.6
0.9
1.2
Unit
DC performance
VDC
Iib
Output DC shift
V
-40°C < Tamb < +85°C
Input bias current
PSRR
Power supply rejection ratio
20 log (∆Vcc/∆Vout)
ICC
Supply current per channel
0.95
VCC=+5V, Vicm=100mV
3
-40°C < Tamb < +85°C
5
VCC=+5V,
∆VCC=200mVp-p, F=1MHz
(without any improvement of the
power supply noise rejection)
37
Vicm=100mV, no load
7.4
-40°C < Tamb < +85°C
8
dB
9
2
2.05
DC voltage gain
V/V
-40°C < Tamb < +85°C
GM
Gain matching
VOH
High level output voltage
VOL
Low level output voltage
1.95
0.5
3.3
2
%
3.8
V
210
mV
Isink
Vin=0.5V DC
Vout is fixed by a generator at 2.5V
25
34
Isource
Vin=0.5V DC
Vout is fixed by a generator at 1V
-28
-38
IOUT
µA
mA
1.95
G
6
mA
Dynamic performance (5th order filter)
FC-SD
Fatt
Flatness
-3dB bandwidth
Small signal
Small signal
Large signal (Vout=2Vp-p)
5.5
5
6.5
6.3
MHz
-1dB bandwidth
Filter attenuation
Small signal, F=27MHz
40
50
dB
+/-0.1
dB
Gain flatness along a 4.5MHz 10kHz to 4.5MHz
band
Vout=2Vp-p
8.2
gd
Group delay
0 to 6MHz
17
ns
D
Delay between each channel
0 to 6MHz
0.5
ns
dG
Differential gain
0.6
%
dPh
Differential phase
0.15
°
62
dB
Noise
SNR
4/13
Signal-to-noise ratio
Bw = 10kHz to 6MHz
TSH173
Electrical characteristics
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
100k
Frequency response
Figure 2.
Gain flatness
6.5
6.4
6.3
6.2
Flatness (dB)
Gain (dB)
Figure 1.
6.1
6.0
5.9
5.8
Vcc=+5V
Small signal
Vicm=0.5V
Load=150Ω
5.7
5.6
1M
Vcc=+5V
Vin=1Vp-p
Vicm=0.5V
Load=150Ω
5.5
100k
10M
1M
Frequency (Hz)
Figure 3.
10M
Frequency (Hz)
Total input noise vs. frequency
Figure 4.
500
Distortion on 150Ω load
-30
No load
Input to GND
Vcc=+5V
400
Vcc=+5V
Vicm=0.5V
F=1MHz
Load=150Ω
-40
Distortion (dB)
en (nV/VHz)
-50
300
200
-60
-70
HD2
-80
100
-90
0
100
1k
10k
100k
1M
HD3
-100
0.0
10M
0.5
Figure 5.
1.0
1.5
2.0
2.5
3.0
Output Amplitude (Vp-p)
Frequency (Hz)
Cross-talk vs. frequency
Figure 6.
Output voltage swing vs. supply
-30
5.0
Vcc=+5V
Load=150Ω
Vin=1Vp-p
Vicm=+0.5V
-40
Cross-talk (dB)
-45
-50
-55
-60
-65
-70
-75
4.0
3.5
3.0
2.5
2.0
1.5
F=1MHz
Vicm=+0.5V
Load=150Ω
1.0
-80
0.5
-85
-90
100k
4.5
Output swing (Vp-p)
-35
1M
Frequency (Hz)
10M
0.0
4.5
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
Vcc (V)
5/13
Electrical characteristics
Figure 7.
TSH173
Quiescent current vs. supply
Figure 8.
30
80
25
60
Vcc=+5V
Vin=+0.5V DC
Vout is fixed by a generator
40
Iout (mA)
20
Icc (mA)
Isink and Isource
15
20
0
10
-20
5
-40
0
0
1
2
3
4
5
6
1
2
Vcc (V)
Figure 9.
3
4
Vout (V)
Supply current vs. Tamb
Figure 10. Output DC shift vs. Tamb
25
1.00
Vcc=+5V
Load=150Ω
0.98
24
0.96
Output DCshift (V)
23
ICC (mA)
22
21
20
19
18
-20
0.92
0.90
0.88
0.86
0.84
Vcc=+5V
no Load
17
-40
0.94
0.82
0
20
40
60
0.80
-40
80
-20
0
Ambient Temperature (°C)
Figure 11.
20
40
60
80
60
80
Temperature (°C)
Voltage gain vs. Tamb
Figure 12. -1dB bandwidth vs. Tamb
6.6
9.0
8.5
6.4
Bw@-1dB (MHz)
Gain (dB)
6.2
6.0
5.8
Vcc=+5V
Load=150Ω
7.0
6.5
Vin=1Vp-p
6.0
5.5
-20
4.5
0
20
40
Ambient Temperature (°C)
6/13
7.5
5.0
5.6
5.4
-40
Vin=100mVp-p
8.0
60
80
4.0
-40
Vcc=5V
Load=150Ω
-20
0
20
40
Ambient Temperature (°C)
TSH173
Electrical characteristics
Figure 13. Higher output rail vs. Tamb
Figure 14. Gain matching vs. Tamb
1.0
4.0
0.8
GM (%)
VOH (V)
3.5
3.0
Vcc=+5V
Load=150Ω
Vin=+0.3V and +1V
0.6
0.4
2.5
0.2
Vcc=5V
Load=150Ω
2.0
-40
-20
0
20
40
60
0.0
-40
80
-20
50
45
45
40
40
35
30
25
60
80
30
25
0
40
35
Vcc=+5V
-20
20
Figure 16. Isource vs. Tamb
50
Isource (mA)
Isink (mA)
Figure 15. Isink vs. Tamb
20
-40
0
Ambient Temperature (°C)
Ambient Temperature (°C)
20
40
60
80
Ambient Temperature (°C)
20
-40
Vcc=+5V
Load=150Ω
-20
0
20
40
60
80
Ambient Temperature (°C)
Figure 17. Ibias vs. Tamb
5.0
4.5
4.0
IBIAS (µA)
3.5
3.0
2.5
2.0
1.5
1.0
-40
Vcc=+5V
Load=150Ω
-20
0
20
40
60
80
Ambient Temperature (°C)
7/13
Electrical characteristics
3.1
TSH173
Synchronization tip
The TSH173, in single 0/5V supply, is designed to drive the video signal on the line without
any damage to the synchronization tip. This is achieved by a small internal DC shift and a
very low output rail. The DAC offset, as shown in Figure 18, can be as low as 0V.
Nevertheless, in order to minimize the DC component on the line, the output can be AC
coupled by a capacitor (Figure 20).
Figure 18. Input signal
160ns
150ns
Black (30 IRE)
64µs
300mV
4.6µs
(0 IRE)
DAC offset
GND
Synchronization tip
Figure 19. DC coupled output configuration
Video
DAC
75Ω
TSH173
75Ω Cable
Vin
75Ω
Vout
75Ω
Vout
Figure 20. AC coupled output configuration
220µF
Video
DAC
TSH173
Vin
8/13
75Ω
75Ω Cable
TSH173
3.2
Electrical characteristics
Power supply considerations
Correct power supply bypassing is very important for optimizing performance in highfrequency ranges. Bypass capacitors should be placed as close as possible to the IC pins to
improve high-frequency bypassing. A capacitor greater than 10µF is necessary to minimize
the distortion. For better quality bypassing, we recommend to add a 10nF capacitor, also
placed as close as possible to the IC pins. Bypass capacitors must be incorporated for both
the negative and the positive supply.
Figure 21. Circuit for power supply bypassing
+VCC
10µF
+
10nF
4
IN1
IN2
IN3
TSH173
OUT1
OUT2
OUT3
5
9/13
Using the TSH173 to drive video components
4
TSH173
Using the TSH173 to drive video components
Figure 22. Video line interface implementation schematics
2.035V
1V
Video
DAC
1Vpp
0.635V
0.035V
GND
450mV
+
LPF
DAC
load
resistor
Video
DAC
G
0.7Vpp
DAC
load
resistor
1.0175V
B
75Ω 75Ω Cable
GND
+6dB
0.3175V
GND
75Ω
5th Order
2.035V
Video
DAC
1.4Vpp
0.635V
450mV
LPF
TV
0.7Vpp
Reconstruction
Filtering
+
0.3V
0.0175V
GND
75Ω
5th Order
0.3V
GND
1V
75Ω 75Ω Cable
+6dB
2.035V
1V
1Vpp
1V
Reconstruction
Filtering
0.3V
GND
R
2Vpp
1.4Vpp
0.7Vpp
0.7Vpp
0.3V
GND
450mV
+
DAC
load
resistor
1.0175V
Reconstruction
Filtering
0.635V
75Ω 75Ω Cable
GND
LPF
+6dB
0.3175V
GND
75Ω
5th Order
TSH173
The interface is illustrated in Figure 23. It is composed of:
●
Three 75-ohm resistors
●
Three matching resistors
●
One 10µF power supply decoupling capacitor
●
One 10nF power supply decoupling capacitor
Figure 23. Bill of materials of the interface
+5V
DAC
DAC
DAC
Y,G
Pb,B,C
Pr,R,CVBS
Cable
75Ω
Cable
75Ω
Cable
R
R
TSH173
SO8
R
10/13
75Ω
TV
TSH173
5
Package mechanical data
Package mechanical data
Figure 24. SO-8 package
Dimensions
Ref.
Millimeters
Min.
Typ.
Inches
Max.
Min.
Typ.
Max.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.04
0.010
A2
1.10
1.65
0.043
0.065
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E
3.80
4.00
0.150
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
ddd
8° (max.)
0.1
0.04
11/13
Ordering information
6
TSH173
Ordering information
Table 4.
Order codes
Part number
Temperature range
TSH173ID
Package
Packaging
Marking
SO-8
Tube
TSH173I
SO-8
Tape & reel
TSH173I
-40°C to +85°C
TSH173IDT
7
12/13
Revision history
Date
Revision
21-Mar-2007
1
Changes
Initial release.
TSH173
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13/13