Datasheet
THS7353
www.ti.com
SLOS484B –NOVEMBER 2005–REVISED AUGUST 2012
Channel Register Bit Descriptions
Each bit of the subaddress (channel selection) control register as described above allows the user to individually
control the functionality of the THS7353. The benefit of this process allows the user to control the functionality of
each channel independent of the other channels. The bit description is decoded in Table 3.
Table 3. THS7353 Channel Register Bit Decoder Table
BIT
BIT FUNCTION RESULT
VALUE(S)
(MSB) STC Low Pass Filter Selection 0 0 500-kHz Filter – Useful for 9-MHz Video LPF
7, 6
0 1 2.5-MHz Filter – Useful for 16-MHz Video LPF
1 0 5-MHz Filter – Useful for 35-MHz/Bypass Video LPF
1 1 5-MHz Filter – Useful for 35-MHz/Bypass Video LPF
5 Input MUX Selection 0 Input A Select
1 Input B Select
4 , 3 Low-Pass Filter 0 0 9-MHz LPF – Useful for SDTV, S-Video, 480i/576i
Frequency Selection
0 1 16-MHz LPF – Useful for EDTV 480p/576p and VGA
1 0 35-MHz LPF – Useful for 720p, 1080i, and SVGA/XGA
1 1 Bypass LPF – Useful for 1080p and SXGA/UXGA
2, 1, 0 Input Bias Mode Selection and 0 0 0 Disable Channel – Conserves Power
(LSB) Disable Control
0 0 1 Channel On – Mute Function – No Output
0 1 0 Channel On – DC Bias Select
0 1 1 Channel On – DC Bias + 250 mV Offset Select
1 0 0 Channel On – AC Bias Select
1 0 1 Channel On – Sync Tip Clamp with low bias
1 1 0 Channel On – Sync Tip Clamp with mid bias
1 1 1 Channel On – Sync Tip Clamp with high bias
Bits 7 (MSB) and 6 – Controls the AC-Sync Tip Clamp Low Pass Filter function. If AC-STC mode is not used,
this function is ignored.
Bit 5 – Controls the input MUX of the THS7353.
Bits 4 and 3 – Controls the 5
th
order Low Pass Filter –3 dB corner frequency or the bypass mode of operation.
Bits 2, 1, and 0 (LSB) – Selects the input biasing of the THS7353 and the power-savings function. When sync-tip
clamp is selected, the dc input sink bias current is also selectable.
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