Datasheet

TVP7002
SLES206C –MAY 2007–REVISED APRIL 2013 www.ti.com
The selection between bottom- and mid-level clamping is performed by I
2
C subaddress 10h (see Sync-On-Green
Threshold). The fine clamps must also be enabled via I
2
C register 2Ah for proper operation. The internal
clamping time can be adjusted using the I
2
C clamp start and width registers at subaddress 05h and 06h,
respectively (see Clamp Start and Clamp Width).
Table 3. Recommended Clamp Setting by Video Mode
SOG INPUT GREEN ADC CHANNEL RED ADC CHANNEL BLUE ADC CHANNEL
VIDEO MODE
(Y/G) (Y/G) (Pr/R) (Pb/B)
YPbPr component Coarse Fine Bottom Level Fine Mid Level Fine Mid Level
PC graphics Coarse Fine Bottom Level Fine Bottom Level Fine Bottom Level
SCART-RGB Coarse Fine Bottom Level Fine Bottom Level Fine Bottom Level
A single-pole low-pass filter with three selectable cutoff frequencies (0.5, 1.7, and 4.8 MHz) is implemented in the
feedback loop of the sync-tip clamp circuit.
Programmable Gain Control
The TVP7002 provides a 4-bit coarse analog gain control (before A/D conversion) and an 8-bit fine digital gain
control (after A/D conversion). The coarse analog gain and the fine digital gain are both independently
programmable for each ADC channel.
Coarse Gain Control
The 4-bit coarse analog gain control has a 4:1 linear gain control range defined by the following equation.
Coarse Gain = 0.5 + N
CG
/10, where 0 ≤ N
CG
≤ 15
0.5 ≤ Coarse Gain ≤ 2.0
Default: N
CG
= 7 (Coarse Gain = 1.2)
The 4-bit coarse gain control can scale a signal with a voltage-input compliance of 0.5 V
P-P
to 2 V
P-P
to a full-
scale 10-bit A/D output code range. The minimum gain corresponds to a code 0h (2-V
P-P
full-scale input, –6-dB
gain) while the maximum gain corresponds to code Fh (0.5-V
P-P
full scale, +6 dB gain). The 4-bit coarse gain
control is independently controllable for each ADC channel (Red Coarse Gain, Green Coarse Gain, and Blue
Coarse Gain).
Fine Gain Control
The 8-bit fine digital gain control has a 2:1 linear gain control range defined by the following equation.
Fine Gain = 1.0 + N
FG
/256 where 0 ≤ N
FG
≤ 255
1.0 ≤ Fine Gain < 2.0
Default: N
FG
= 0 (Fine Gain = 1.0)
The 8-bit fine gain control is independently controllable for each ADC channel (Red Fine Gain, Green Fine Gain,
and Blue Fine Gain). For a normal PC graphics input, the fine gain is used mostly.
Programmable Offset Control
The TVP7002 provides a 6-bit coarse analog offset control (before A/D conversion) and a 10-bit fine digital offset
control (after A/D conversion). The coarse analog offset and the fine digital offset are both independently
programmable for each ADC channel.
Coarse Offset Control
A 6-bit code sets the coarse offset (Red Coarse Offset, Green Coarse Offset, Blue Coarse Offset) with individual
adjustment per channel. The coarse offset ranges from –32 counts to +31 counts. The coarse offset registers
apply before the ADC.
Fine Offset Control
A 10-bit fine offset registers (Red Fine Offset, Green Fine Offset, Blue Fine Offset) apply after the ADC. The fine
offset ranges from –512 counts to +511 counts.
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