TDA8708B Datasheet, PDF (10/24 Pages) NXP Semiconductors – Video analog input interface

Philips Semiconductors
Video analog input interface
Product specification
TDA8708B
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
I_AGC
1
1 output < 255 −2.5 µA
output > 255 130 µA
0
X⁽²⁾ −
0 µA
1
0 output < 0 +2.5 µA
output > 0 −2.5 µA
MODE⁽¹⁾
1
1
2
2
2
Notes
1. Mode 2 can only be initialized with successive pulses
on GATE A and GATE B (see Fig.5).
2. X = don’t care.
Table 3 CLAMP output current
GATE A GATE B
DIGITAL
OUTPUT
1
1 output < 0
output > 0
X⁽¹⁾
0X
0
1 output < 64
64 < output
Note
1. X = don't care.
I_CLAMP MODE
130 µA
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
V_ADCIN
BINARY OUTPUTS
TWO’S COMPLEMENT
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
−
0000000010000000
V_CCA − 2.41 V 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
−
0000000110000001
−
................
−
................
−
1111111001111110
V_CCA − 1.41 V 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1
−
1111111101111111
1996 Nov 26
10