demonstration board based on the TSH345
Features
■ 4.5 V to 5.5 V single supply operation
■ R-G-B, Y-Pb-Pr, Y-C-CVBS, HD driving
■ 3 matched 6 dB amplifiers
■ 3 internal input DC level shifter
■ Specified for 150 Ω loads
■ No input capacitor is required
■ Very low harmonic distortion
■ Each output can drive AC/DC coupled 150 Ω
loads
■ Tested on 5 V power supply
■ Standby mode
■ Mux on input
■ RoHS compliant
STEVAL-CCA014V1
Triple video buffer with filter for HD
Data brief
STEVAL-CCA014V1
Description
This demonstration board is designed to evaluate
the TSH345, a single supply triple video buffer
featuring an internal gain of 6 dB and an internal
low pass filter of 36 MHz cut-off frequency for
each channel to fit with high definition
requirements for video line interfaces.
June 2009 Doc ID 15862 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Circuit schematics STEVAL-CCA014V1
10uF
J13
J14
BNC
75R
J10
BN
J9
BNC
R3
47K
R2
75R
R2
nc
R3
nc
CR20R0R
R3
nc
+VCC
R1i
R2i
G1i
G2i
B1i
B2i
GND
VCC
Mux
Bout
10
Gout
11
Rout
12
FS1
13
FS0
14
+6dB
MUX
LPF
+6dB
MUX
LPF
+6dB
MUX
LPF
DC
Shif
IC
TSH345
J8
BNC
R2
75R
R2
nc
R2
nc
J7
BNC
R2
75R
R2
nc
R2
nc
C10ncnc
C11ncnc
C12ncnc
100uF
J11
BN
R3
47K
R3
nc
+VCC
J12
BN
R3
47K
R3
nc
+VCC
BNC
75R
CR30R0R
BNC
75R
CR40R0R
BNC
75R
CR50R0R
BNC
75R
CR60R0R
BNC
75R
CR10R0R
+VCC
100nF
R1
nc
R7
nc
+VCC
R1
nc
R8
nc
+VCC
R1
nc
R9
nc
+VCC
R1
nc
R10
nc
+VCC
R1
nc
R11
nc
+VCC
R1
nc
R12
nc
+VCC
+VCC
LR10R0R
S2
+VCC
S0
+VCC
S1
+VCC
R21
0R
R19
0R
R20
0R
J1
1 Circuit schematics
Figure 1. Schematic diagram
J7
BNC
0R
C10
R19
4
R2
nc
3
R2
75R
1
J14
2
1
5
J1
1
J13
C9C910uF
LR1
+VCC
C8C8100uF
CR2
4
R1
nc
R8
nc
+VCC
CR3
R2R275R
3
R1
nc
R7
nc
CR1
+VCC
R1R175R
2
R2
nc
1
IC
TSH345
5
R1
nc
R9
nc
+VCC
CR4
R3R375R
J8
BNC
0R
C11
R20
7
R2
nc
6
R2
75R
5
R2
nc
11
12
Rout
Gout
+6dB
+6dB
LPF
LPF
MUX
MUX
n
n
R1i
1
n
n
R2i
G1i
G2i
2
5
3
4
6
R1
R10
+VCC
nc
nc
CR5
R5R575R
R4R475R
J9
BNC
0R
C12
R21
0
R3
nc
9
R2
75R
8
R2
nc
8
10
Bout
GND
t
+6dB
Shif
DC
LPF
MUX
n
n
B1i
B2i
6
FS1
FS0
Mux
VCC
7
C7C7100nF
+VCC
S1
13
14
9
+VCC
7
R1
nc
R11
nc
+VCC
CR6
R6R675R
8
R1
R12
+VCC
+VCC
S2
nc
nc
6
47K
R3
5
R3
C
BN
nc
J12
+VCC
+VCC
4
R3
47K
S0
3
R3
C
BN
nc
J11
+VCC
2
R3
47K
C
1
R3
BN
nc
J10
+VCC
J1J1BNC
2/4 Doc ID 15862 Rev 1
J2J2BNC
J3J3BNC
J4J4BNC
J5J5BNC
J6J6BNC
AM03805v1
STEVAL-CCA014V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
11-Jun-2009 1 Initial release.
Doc ID 15862 Rev 1 3/4
STEVAL-CCA014V1
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4/4 Doc ID 15862 Rev 1
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