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參數資料
型號： TVP7002PZPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： GREEN, PLASTIC, HTQFP-100
文件頁數： 4/57頁
文件大小： 517K
代理商： TVP7002PZPR
SLES206B
– MAY 2007 – REVISED MAY 2011
The selection between bottom- and mid-level clamping is performed by I2C subaddress 10h (see Sync-On-Green
Threshold). The fine clamps must also be enabled via I2C register 2Ah for proper operation. The internal
clamping time can be adjusted using the I2C 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)
(Pr/R)
(Pb/B)
YPbPr component
Coarse
Fine Bottom Level
Fine Mid Level
PC graphics
Coarse
Fine Bottom Level
SCART-RGB
Coarse
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 + NCG/10, where 0 ≤ NCG ≤ 15
0.5
≤ Coarse Gain ≤ 2.0
Default: NCG = 7 (Coarse Gain = 1.2)
The 4-bit coarse gain control can scale a signal with a voltage-input compliance of 0.5 VP-P to 2 VP-P to a
full-scale 10-bit A/D output code range. The minimum gain corresponds to a code 0h (2-VP-P full-scale
input,
–6-dB gain) while the maximum gain corresponds to code Fh (0.5-VP-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 + NFG/256 where 0 ≤ NFG ≤ 255
1.0
≤ Fine Gain < 2.0
Default: NFG = 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.
12
Copyright
2007–2011, Texas Instruments Incorporated
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