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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 150 loads Tested on 5V power supply Data min. and max. are tested during production
IN2 2
8.2MHz 5th order 8.2MHz 5th order
DC Shifter
Pin connections (top view)
IN1 1
8.2MHz 5th order
6dB
8 OUT1

6dB
7 OUT2
IN3 3
6dB
6 OUT3 5 GND
Applications

Set top boxes DVD players/recorders High-end video systems Standard definition TV (SD) Multimedia products
+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. Another advantage of the TSH173 is its input DC level shifter to drive the video signal on a 75 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. 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.
March 2007
Rev 1
1/13
www.st.com 13
Contents
TSH173
Contents
1 2 3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 3.2 Synchronization tip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 5 6 7
Using the TSH173 to drive video components . . . . . . . . . . . . . . . . . . . 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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TSH173
Absolute maximum ratings
1
Absolute maximum ratings
Table 1.
Symbol
VCC
Absolute maximum ratings
Parameter Supply voltage (1) Operating free air temperature range Storage temperature Maximum junction temperature SO8 thermal resistance junction to case SO8 thermal resistance junction to ambient area Maximum power dissipation (@Tamb=25C) for Tj=150C CDM: charged device model HBM: human body model MM: machine model Output short-circuit Value 6 -40 to +85 -65 to +150 150 28 157 800 1.5 2 200
(2)
Unit V C C C C/W C/W mW kV kV V
Toper Tstg Tj Rthjc Rthja Pmax.
ESD
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 4.5 to 5.5(1) Unit V
1. Tested in full production at 0V/5V single power supply.
3/13
Electrical characteristics
TSH173
3
Table 3.
Symbol
Electrical characteristics
VCC = +5V single supply, load: RL = 150, Tamb = 25C (unless otherwise specified)
Parameter Test conditions Min. Typ. Max. Unit
DC performance 0.6 VDC Output DC shift -40C < Tamb < +85C Input bias current VCC=+5V, Vicm=100mV -40C < Tamb < +85C Power supply rejection ratio 20 log (Vcc/Vout) VCC=+5V, VCC=200mVp-p, F=1MHz (without any improvement of the power supply noise rejection) Vicm=100mV, no load -40C < Tamb < +85C 1.95 G GM VOH VOL DC voltage gain -40C < Tamb < +85C Gain matching High level output voltage Low level output voltage Isink IOUT Isource Dynamic performance (5th order filter) -3dB bandwidth FC-SD Fatt Flatness gd D dG dPh Noise SNR Signal-to-noise ratio Bw = 10kHz to 6MHz 62 dB -1dB bandwidth Filter attenuation Small signal Small signal Large signal (Vout=2Vp-p) Small signal, F=27MHz 5.5 5 40 8.2 6.5 6.3 50 +/-0.1 17 0.5 0.6 0.15 MHz Vin=0.5V DC Vout is fixed by a generator at 2.5V Vin=0.5V DC Vout is fixed by a generator at 1V 25 -28 3.3 1.95 0.5 3.8 210 34 mA -38 2 % V mV 0.95 3 5 6 A 0.9 1.2 V
Iib
PSRR
37
dB
7.4 8 2
9 mA 2.05 V/V
ICC
Supply current per channel
dB dB ns ns %
Gain flatness along a 4.5MHz 10kHz to 4.5MHz band Vout=2Vp-p Group delay Delay between each channel Differential gain Differential phase 0 to 6MHz 0 to 6MHz
4/13
TSH173
Electrical characteristics
Figure 1.
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 100k
Frequency response
Figure 2.
6.5 6.4 6.3 6.2
Gain flatness
Flatness (dB)
Vcc=+5V Small signal Vicm=0.5V Load=150
1M 10M
Gain (dB)
6.1 6.0 5.9 5.8 5.7 5.6 5.5 100k
Vcc=+5V Vin=1Vp-p Vicm=0.5V Load=150
1M 10M
Frequency (Hz)
Frequency (Hz)
Figure 3.
500
Total input noise vs. frequency
No load Input to GND Vcc=+5V
Figure 4.
-30
Distortion on 150 load
Vcc=+5V Vicm=0.5V F=1MHz Load=150
-40
400
-50
en (nV/VHz)
300
Distortion (dB)
-60
200
-70
HD2
-80
100
-90
HD3
0 100
1k
10k
100k
1M
10M
-100 0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (Hz)
Output Amplitude (Vp-p)
Figure 5.
-30 -35 -40 -45
Cross-talk vs. frequency
Vcc=+5V Load=150 Vin=1Vp-p Vicm=+0.5V
Figure 6.
5.0 4.5 4.0
Output voltage swing vs. supply
Output swing (Vp-p)
Cross-talk (dB)
-50 -55 -60 -65 -70 -75 -80 -85 -90 100k 1M 10M
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 4.5
F=1MHz Vicm=+0.5V Load=150
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
5.4
5.5
Frequency (Hz)
Vcc (V)
5/13
Electrical characteristics
TSH173
Figure 7.
30
Quiescent current vs. supply
Figure 8.
80
Isink and Isource
25
60
Vcc=+5V Vin=+0.5V DC Vout is fixed by a generator
20
40
Iout (mA)
0 1 2 3 4 5 6
Icc (mA)
20
15
0
10 -20 5 -40 0 1 2 3 4
Vcc (V)
Vout (V)
Figure 9.
25 24 23
Supply current vs. Tamb
Figure 10. Output DC shift vs. Tamb
1.00 0.98 0.96
Vcc=+5V Load=150
Output DCshift (V)
Vcc=+5V no Load
-20 0 20 40 60 80
0.94 0.92 0.90 0.88 0.86 0.84 0.82 0.80 -40
22
ICC (mA)
21 20 19 18 17 -40
-20
0
20
40
60
80
Ambient Temperature (C)
Temperature (C)
Figure 11.
6.6
Voltage gain vs. Tamb
Figure 12. -1dB bandwidth vs. Tamb
9.0 8.5
6.4
8.0
Vin=100mVp-p
6.2
Bw@-1dB (MHz)
7.5 7.0 6.5 6.0 5.5 5.0
Gain (dB)
6.0
Vin=1Vp-p
5.8
5.6
Vcc=+5V Load=150
5.4 -40 -20 0 20 40 60 80
4.5 4.0 -40
Vcc=5V Load=150
-20 0 20 40 60 80
Ambient Temperature (C)
Ambient Temperature (C)
6/13
TSH173
Electrical characteristics
Figure 13. Higher output rail vs. Tamb
4.0
Figure 14. Gain matching vs. Tamb
1.0
0.8 3.5
Vcc=+5V Load=150 Vin=+0.3V and +1V
3.0
GM (%)
Vcc=5V Load=150
0.6
VOH (V)
0.4
2.5 0.2
2.0 -40
-20
0
20
40
60
80
0.0 -40
-20
0
20
40
60
80
Ambient Temperature (C)
Ambient Temperature (C)
Figure 15. Isink vs. Tamb
50
Figure 16. Isource vs. Tamb
50
45
45
35
Isource (mA)
40
40
Isink (mA)
35
30
30
25
25
Vcc=+5V
20 -40 -20 0 20 40 60 80 20 -40
Vcc=+5V Load=150
-20 0 20 40 60 80
Ambient Temperature (C)
Ambient Temperature (C)
Figure 17. Ibias vs. Tamb
5.0 4.5 4.0 3.5
IBIAS (A)
3.0 2.5 2.0 1.5 1.0 -40
Vcc=+5V Load=150
-20 0 20 40 60 80
Ambient Temperature (C)
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Electrical characteristics
TSH173
3.1
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)
300mV 4.6s DAC offset
64s
(0 IRE)
GND
Synchronization tip
Figure 19. DC coupled output configuration
Video DAC
75 TSH173
Vin
75 Cable
75
Vout
Figure 20. AC coupled output configuration
220F Video DAC Vin
75
TSH173
75 Cable
75
Vout
8/13
TSH173
Electrical characteristics
3.2
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 10F 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 + 10nF 10F
4
IN1 IN2 IN3 TSH173 OUT1 OUT2 OUT3
5
9/13
Using the TSH173 to drive video components
TSH173
4
Using the TSH173 to drive video components
Figure 22. Video line interface implementation schematics
2.035V
2Vpp
1V
1V 0.3V GND
1Vpp Reconstruction Filtering
0.635V 0.035V GND
1Vpp
Video DAC
R
450mV
+
DAC load resistor
LPF
5th Order
+6dB
75 75 Cable
0.3V 0.0175V GND
TV
75
1.4Vpp 0.7Vpp
1.0175V 0.635V GND
2.035V
1V
0.7Vpp
Video DAC
G
0.3V GND
Reconstruction Filtering
450mV
+
DAC load resistor
LPF
5th Order
+6dB
75 75 Cable
0.3175V GND
75
1.4Vpp 0.7Vpp
1.0175V 0.635V GND
2.035V
1V
0.7Vpp
Video DAC
B
0.3V GND
450mV
Reconstruction Filtering
+
DAC load resistor
LPF
5th Order
+6dB
TSH173
75 75 Cable
0.3175V GND
75
The interface is illustrated in Figure 23. It is composed of: Three 75-ohm resistors Three matching resistors One 10F power supply decoupling capacitor One 10nF power supply decoupling capacitor Figure 23. Bill of materials of the interface
+5V
DAC
Y,G Pb,B,C Pr,R,CVBS
R
75 75
R R
Cable
DAC
Cable
TV
TSH173
SO8
75
DAC
Cable
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TSH173
Package mechanical data
5
Package mechanical data
Figure 24. SO-8 package
Dimensions Ref. Min. Millimeters Typ. Max. Min. Inches Typ. Max.
A A1 A2 B C D E e H h L k ddd
1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 5.80 0.25 0.40
1.75 0.25 1.65 0.51 0.25 5.00 4.00
0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050
0.069 0.010 0.065 0.020 0.010 0.197 0.157
6.20 0.50 1.27
0.228 0.010 0.016 8 (max.)
0.244 0.020 0.050
0.1
0.04
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Ordering information
TSH173
6
Ordering information
Table 4. Order codes
Temperature range Package Packaging Marking
Part number
TSH173ID -40C to +85C TSH173IDT
SO-8 SO-8
Tube Tape & reel
TSH173I TSH173I
7
Revision history
Date Revision Changes
21-Mar-2007
1
Initial release.
12/13
TSH173
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