TB1328FG Toshiba, TB1328FG Datasheet - Page 26

• Manufacturer Part Number: TB1328FG
• Manufacturer: Toshiba

Specifications of TB1328FG

• Function: Programmable audio/video switch and frequency detection
• Features: CVBS, S-Video or YcbrCr/RGB or D-connector, auto sync processor, pre-filter, dummy HD/VD output
• Operating Voltage: 9V,5V
• Package: QFP64 (lead-free)

GCA gain
I2C-Bus, and this LSI does not have an Input level detection circuit.. In order to perform GCA control, it is necessary to
input CVBS/Y/G OUT to SYNC2 IN. By doing so, V latch starts with a Vsepa signal and GCA control becomes possible.
In this case, the BUS must be set as CVBS/Y GAIN=1 (-3dB).
The following figure shows typical GCA gain characteristics.
GCA gain is controlled by Y/G/CVBS OUT gain, and controls only CVBS Input signal. GCA gain is controlled by a 6bit
1.40Vp-p
0.44Vp-p
Input Level（Vp-p)
Output Level（Vp-p
GAIN Typ.（ｄB）
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.4
Dec
Hex
Bin 000000 001101 011010 100001 100111 110100 111111
0.6
Min
4.0329 0.5043 -1.998 -3.096 -3.938 -5.523 -6.0206
0.44 0.6605
0.7
00
0
0.8
CVBS
input
0.7
0D
13
Input Level
-3dB
0.881 0.9998 1.1015 1.3221
1
0.7
1A
26
Typ
GCA
26
0.7
33
21
1.2
Output Level（Vp-p)
GAIN Typ.（ｄB）
0.7
39
27
0.7Vp-p
1.4
CVBS
output
0.7
52
34
Max
100IRE
1.6
5
3
1
-1
-3
-5
-7
1.4
0.7
3F
63
TB1328FG
2006-11-13
768LSB
256LSB