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TSH120ICT

P1-P3P4-P6P7-P9P10-P12P13-P13
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TSH120 Electrical characteristics
7/13
Figure 12. Voltage gain vs. T
amb
Figure 13. Filter attenuation vs. T
amb
-40-200 20406080
5.80
5.85
5.90
5.95
6.00
6.05
6.10
Vcc=+2.5V and +3.3V
Load=150
Ω
Gain (dB)
Temperature (°C)
-40-200 20406080
-40
-38
-36
-34
-32
-30
-28
-26
-24
-22
-20
Vcc=+3.3V
Vcc=+2.5V
Load=150Ω
Attenuation@27MHz (dB)
Temperature (°C)
Figure 14. Supply current vs. T
amb
Figure 15. Output DC shift vs. T
amb
Figure 16. V
OH
vs. T
amb
Figure 17. V
OL
vs. T
amb
-40 -20 0 20 40 60 80
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
Vcc=+2.5V and +3.3V
no input signal
no Load
Temperature (°C)
I
CC
(mA)
-40-200 20406080
80
90
100
110
120
130
140
150
160
170
180
Vcc=+2.5V and +3.3V
Load=150
Ω
Output DCshift (V)
Temperature (°C)
-40-200 20406080
2.0
2.5
3.0
3.5
4.0
Vcc=+2.5V
Vcc=+3.3V
Load=150Ω
V
OH
(V)
Temperature (°C)
-40-200 20406080
0
1
2
3
4
5
6
7
8
9
10
Vcc=+2.5V
Vcc=+3.3V
Load=150Ω
V
OL
(mV)
Temperature (°C)
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Implementation in the application TSH120
8/13
3 Implementation in the application
This section explains how the TSH120 video buffer operates in a typical application.
On the input, a DC level shifter optimizes the position of the video signal with no clamping
on the output rails. The filter is a reconstruction filter. It is used to attenuate the DAC’s
sampling frequency which causes a parasitic signal in the video spectrum (typically at
27MHz in the case of standard video). This function must be achieved while keeping a low
group delay.
On the output, the SAG correction decreases C
out
while keeping a very low frequency pole
(see Figure 18). Nevertheless, the output can be directly connected to the line without any
capacitor. In this case, both OUT and SAG pins are connected together and the equivalent
gain of the buffer remains 6dB (see Figure 19).
Figure 18. Schematic diagram with output capacitor
Figure 19. Schematic diagram without output capacitor
75
75 cable
75
+
-
+2.2V to +5.5V
C
out
33µF
Rail-to-rail
DC shifter
LPF
3
rd
order
1
TV
Video
DAC
1V
pp
2V
pp
1V
pp
SAG
6
2
4
3
5
Shutdown
22µF
75
75 cable
75
+
-
+2.2V to +5.5V
C
out
33µF
Rail-to-rail
DC shifter
LPF
3
rd
order
1
TV
Video
DAC
1V
pp
2V
pp
1V
pp
SAG
6
2
4
3
5
Shutdown
22µF
75
75 cable
75
+
-
Rail-to-rail
DC shifter
LPF
3
rd
order
1
TV
Video
DAC
1V
pp
2V
pp
1V
pp
SAG
6
2
4
3
5
Shutdown
+2.2V to +5.5V
75
75 cable
75
+
-
Rail-to-rail
DC shifter
LPF
3
rd
order
1
TV
Video
DAC
1V
pp
2V
pp
1V
pp
SAG
6
2
4
3
5
Shutdown
+2.2V to +5.5V
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TSH120 Power supply considerations
9/13
4 Power supply considerations
Correct power supply bypassing is very important for optimizing performance in the high-
frequency range. A bypass capacitor greater than 10μF is necessary to minimize the
distortion. For better quality bypassing at higher frequencies, a capacitor of 10nF must be
added as close as possible to the IC pin of V
CC
.
Figure 20. Circuit for power supply bypassing
Figure 21 shows the noise supply rejection improvement with bypass capacitors expressed
by:
20 log (ΔV
out
/ ΔV
CC
).
Figure 21. Noise supply rejection
+V
CC
C
LF
=10 F
+
C
HF
=10nF
TSH120
+V
CC
C
LF
=10 F
+
C
HF
=10nF
TSH120
10k 100k 1M 10M 100M
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Vcc=+3.3Vdc+0.2Vac
Load=150
Ω
C
LF
=10uF
C
HF
=100nF
Noise supply rejection (dB)
Frequency (Hz)
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P1-P3P4-P6P7-P9P10-P12P13-P13

TSH120ICT

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Manufacturer:
STMicroelectronics
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