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TSH103
Low cost triple video buffer/filter for standard video
Features

Triple channels Internal 6MHz-reconstruction filter (4th order) 6dB-gain buffer for 75 lines 5V single supply Bottom of video signal close to 0V Data min. and max. are physically tested and guaranteed during production Pin connections SO-8 plastic package
Applications

Standard definition TV Set-top box DVD player/recorder
IN2 2 IN1 1
+ + +
6MHz LPF
6dB
8 OUT1
6MHz LPF
6dB
7 OUT2
Description
The TSH103 is a low cost video buffer. It is dedicated to drive video signals from any video DACs output on 75 video lines in standard definition. With a real benefit in terms of integration and cost saving, this product is particularly efficient for the replacement of current discrete solutions using transistors, coil and capacitors for buffering and filtering. This triple channel is designed to drive either CVBS/Y-C or RGB or YPbPr or YUV formats. Each channel features an internal 6MHz reconstruction filter and a 6dB buffer (attenuation of 27MHz sampling and good output impedance matching with the video line). The TSH103 requires a single 5V power supply. It is available in SO-8 plastic package.
IN3 3 +Vcc 4
6MHz LPF
6dB
6 OUT3 5 GND
DC shifter
September 2007
Rev 1
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www.st.com 10
Absolute maximum ratings
TSH103
1
Absolute maximum ratings
Table 1.
Symbol
VCC
Absolute maximum ratings
Parameter Value Unit
Supply voltage (1) Maximum input voltage swing Operating free air temperature range Storage temperature Maximum junction temperature SO-8 thermal resistance junction to case SO-8 thermal resistance junction to ambient area HBM: human body model CDM: charged device model MM: machine model Output short-circuit
6 0 to 3 -40 to +85 -65 to +150 150 28 157 3.5 1.5 200
(2)
V V C C C C/W C/W kV kV V
Vin Toper Tstg Tj Rthjc Rthja ESD
1. All voltage values 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 Value Unit
Power supply voltage
4.5 to 5.5 (1)
V
1. This range is guaranteed by design (the product is tested in full production at 5V single power supply).
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TSH103
Electrical characteristics
3
Table 3.
Symbol
Electrical characteristics
VCC = +5V single supply, Tamb = 25C (unless otherwise specified)
Parameter Test conditions Min. Typ. Max. Unit
DC performance
VDC
Output DC shift
RL = 150 -40C < Tamb < +85C
100
310 312 1.2 1.4 5.5 5.6
430 mV
Iib
Input bias current
Vin= 0V -40C < Tamb < +85C
A
ICC
Supply current per channel
Vin= 0.5V DC -40C < Tamb < +85C
7.1 mA
G VOH VOL IOUT
DC voltage gain High level output voltage Low level output voltage Isink/Isource
RL = 150 -40C < Tamb < +85C RL = 150 RL = 150
1.93
1.97 1.96 3.9 41 56
2 V/V V 46 mV mA
Video performance
-3dB bandwidth FCut Fatt gd dG dPh
Noise
Small signal, RL = 150 Small signal, RL = 150 Small signal, F= 27MHz 0 to 5MHz RL = 150 RL = 150 5.1
9.4 MHz 7.4 37 10 0.5 0.5 dB ns %
-1dB bandwidth Filter attenuation Group delay Differential gain Differential phase
en
Input voltage noise
100kHz
76
nV/VHz
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Electrical characteristics
TSH103
Figure 1.
10 5 0 -5 -10 -15
Frequency response
Figure 2.
7.0 6.8 6.6 6.4
Gain flatness
Gain (dB)
-20 -25 -30 -35 -40 -45 -50 -55 -60 100k
Gain (dB)
Vcc = +4.5V, +5V, +5.5V Small signal Load = 150
1M 10M
27MHz
6.2 6.0 5.8 5.6 5.4 5.2 5.0 100k
Vcc = +4.5V, +5V, +5.5V Small signal Load = 150
1M 10M
100M
Frequency (Hz)
Frequency (Hz)
Figure 3.
10 5 0 -5 -10 -15
Frequency response (large signal)
Figure 4.
-40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 0.0
Distortion
H2
-20 -25 -30 -35 -40 -45 -50 -55 -60 100k
Distortion (dB)
Gain (dB)
H3
Vcc = +4.5V, +5V, +5.5V Vout = 2Vp-p Load = 150
1M 10M 100M
Vcc = +5V Vicm = +0.5V F = 1MHz Load = 150
1.0 1.5 2.0 2.5 3.0 3.5 4.0
0.5
Frequency (Hz)
Output Amplitude (Vp-p)
Figure 5.
6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.5
Quiescent current vs. Supply
Figure 6.
260 240 220 200 180
Input noise vs. frequency
No load Input to GND Vcc=+5V
en (nV/VHz)
no input signal no load
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Icc (mA)
160 140 120 100 80 60 40 1k 10k 100k 1M
Vcc (V)
Frequency (Hz)
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TSH103
Power supply considerations
4
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 of 100F is necessary to minimize the power supply noise in low frequency. For better quality bypassing, we recommend to add a CMS 100nF capacitor, also placed as close as possible to the IC pins. Figure 7. Circuit for power supply bypassing
+VCC + CHF=100nF CLF=100F
4
IN1 IN2 IN3 TSH103 OUT1 OUT2 OUT3
5
Figure 8.
Noise supply rejection
0 -10
Noise supply rejection (dB)
-20 -30 -40 -50 -60 -70 -80 -90 -100 100k
Vcc=+5Vdc+0.2Vac Load=150 C LF=100uF C HF=100nF
1M
10M
Frequency (Hz)
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Using the TSH103 to drive video signals
TSH103
5
Using the TSH103 to drive video signals
Figure 9. Video line interface implementation schematics
+5V
1V
2.3V
2Vpp
1.15V
1Vpp
0.9V GND
1Vpp
0.45V
Video DAC
Y
0.3V GND
75
75 Cable
GND
TV
DAC load resistor
75
1.4Vpp 0.7Vpp
1.15V 0.9V GND
2.3V
1V
0.7Vpp
Video DAC
Pb
0.3V GND
75
75 Cable
0.45V GND
TSH103
DAC load resistor
75
1.4Vpp 0.7Vpp
1.15V 0.9V GND
2.3V
1V
0.7Vpp
Video DAC
Pr
0.3V GND
75
75 Cable
0.45V GND
DAC load resistor
75
The bottom of the synchronization tip at the DAC output can be as low as 0mV. In that case, the bottom is equal to 310mV typical at the TSH103 output (see values of the output DC shift in Table 3). The Y signal can be properly driven by the TSH103 because its low output rail (VOL) is lower than 46mV (Table 3). Figure 10. Details on Y or G or CVBS for synchronization tip
Amplitude White (1V) Y signal DAC Black (300mV) GND
Synchronization tip (close to zero volt)
time
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TSH103
Using the TSH103 to drive video signals
The interface is illustrated in Figure 11. It is composed of: Three 75-ohm resistors Three matching resistors One 10F power supply decoupling capacitor One 10nF power supply decoupling capacitor
Figure 11. Implementation of the TSH103 (output DC and AC coupling)
+5V
DAC
Y,G Pb,B,C Pr,B, CVBS
R
75 75 TSH103 TSH173
SO8 SO8
Cable
Cable
DAC
TV
R
75
Cable
DAC
R
+5V
DAC
Y,G Pb,B,C Pr,B, CVBS
R
220F
+
220F
75 75 75
Cable
DAC
+
R
Cable
TV
TSH103 TSH173
SO8 SO8
220F
DAC
+
Cable
R
1. Note that the TSH103 is input DC coupling only. It is not AC coupling.
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Package information
TSH103
6
Package information
Figure 12. SO-8 package mechanical data
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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TSH103
Ordering information
7
Ordering information
Table 4. Order codes
Temperature range Package Packaging Marking
Part number
TSH103ID TSH103IDT
-40C to +85C -40C to +85C
SO-8 SO-8
Tube Tape & reel
TSH103I TSH103I
8
Revision history
Date Revision Changes
19-Sep-2007
1
Initial release.
9/10
TSH103
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