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參數(shù)資料
| 型號(hào)： | TLV5734PAG |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 3-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 288K |
| 代理商： | TLV5734PAG |
TLV5734
TRIPLE 8BIT 30MSPS ADC WITH HIGH
PRECISION CLAMP FOR YUV/RGB VIDEO
SLES026A APRIL 2002 REVISED JANUARY 2003
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
clamp function
The TLV5734 employs a clamp feedback circuit on each channel to correct the clamp level mismatch
contributed by the offset of each channel. The clamp levels are used for either the YUV or RGB video signal.
Figure 2 shows the clamp circuit and the external R and C required for the clamp operation. The clamp circuit
also requires an externally generated active-high clamp pulse to be applied to input EXTCLP. The clamp pulse
defines the timing window during which the clamp circuit is enabled. For video applications, the clamp pulse
must be applied during the back porch of the sync portion of the horizontal blanking interval. For an embedded
sync video input (G/Y), the external clamp high must start after the gap A between sync and clamp start (see
Figure 3 and Table 3).
The clamp is enabled by applying a logic high on the EXTCLP input. This closes switch SW1 and enables the
digital comparator. The output of the ADC is then compared digitally with the preset clamp level (as defined in
Table 1), then the voltage on clamp capacitor C2 is charged/discharged through the 3-state buffer and resistor
R to make the ADC output equal to the desired clamp level. Once the desired clamp level is attained, the 3-state
buffer is put in the high-impedance mode and the clamp voltage is stored on input capacitor C1 until the next
clamp pulse.
R
15 k
Video Input
Digital
Comparator
C2
0.1
F
C1
0.1
F
TLV5734
ADC_OUT
ADC
CLPV
CLP OUT
EXTCLP
SW1
CLP_OE
C_OUT
Preset Clamp Level
(See Table 1)
3-State
Buffer
Figure 2. Clamp Feedback Circuit
Table 1. Preset Clamp Level
ADC CHANNEL
YUV (G/Y = HIGH)
RGB (G/Y = LOW)
ADC CHANNEL
OUTPUT CODE
APPLICATION
OUTPUT CODE
APPLICATION
CHANNEL A
0001 0000b
Y
0001 0000b
R, G, B
CHANNEL B
1000 0000b
U, V
0001 0000b
R, G, B
CHANNEL C
1000 0000b
U, V
0001 0000b
R, G, B
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