TDA8708 查看數據表（PDF） - Philips Electronics

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TDA8708

Video analog input interface

Philips Electronics 

Philips Semiconductors

Video analog input interface

Product specification

TDA8708A

Table 1 Video input selection (CVBS).

I1

I0

0

0

0

1

1

0

1

1

SELECTED INPUT

VIN0

VIN1

VIN2

VIN2

Table 2 AGC output current.

GATE A GATE B

DIGITAL

OUTPUT

IAGC

1

1 output < 255 −2.5 µA

output > 255 IAGCM

0

X(1) output < 248 0 µA

output > 248 IAGCM

1

0 output < 0 +2.5 µA

0 < output < −2.5 µA

248

output > 248 IAGCM

MODE(2)

1

1

2

2

2

2

2

Note

1. X = don't care.

2. Mode 2 can only be initialized with successive pulses

on GATE A and GATE B (see Fig.5).

Table 3 CLAMP output current.

GATE A GATE B

DIGITAL

OUTPUT

1

1 output < 0

output > 0

X(1)

0

X(1)

0

1 output < 64

64 < output

Note

1. X = don't care.

ICLAMP MODE

ICLAMPM

1

−2.5 µA

1

0 µA

2

+50 µA

2

−50 µA

2

Table 4 OF input coding.

OF

0

1

open circuit(1)

D0 TO D7

active, two's complement

high impedance

active, binary

Note

1. Use C ≥ 10 pF to DGND.

Table 5 Output coding and input voltage (typical values).

STEP

Underflow

0

1

.

.

254

255

Overflow

VADCIN

BINARY OUTPUTS

TWO'S COMPLEMENT

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

−

0000000010000000

VCCA − 2.41 V 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0

−

0000000110000001

−

................

−

................

−

1111111001111110

VCCA − 1.41 V 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1

−

1111111101111111

June 1994

10

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