
June 1994
2
Philips Semiconductors
Product specication
Video analog input interface
TDA8708A
FEATURES
8-bit resolution
Sampling rate up to 32 MHz
Binary or two's complement 3-state TTL outputs
TTL-compatible digital inputs and outputs
Internal reference voltage regulator
Power dissipation of 365 mW (typical)
Input selector circuit (one out of three video inputs)
Clamp and Automatic Gain Control (AGC) functions for
CVBS and Y signals
No sample-and-hold circuit required.
The TDA8708A has white peak control in modes 1 and
2 whereas the TDA8708B has control in mode 1 only.
APPLICATIONS
Video signal decoding
Scrambled TV (encoding and decoding)
Digital picture processing
Frame grabbing.
GENERAL DESCRIPTION
The TDA8708A is an analog input interface for video signal
processing. It includes a video amplifier with clamp and
gain control, an 8-bit analog-to-digital converter (ADC)
with a sampling rate of 32 MHz and an input selector.
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
VCCA
analog supply voltage
4.5
5.0
5.5
V
VCCD
digital supply voltage
4.5
5.0
5.5
V
VCCO
TTL output supply voltage
4.2
5.0
5.5
V
ICCA
analog supply current
37
45
mA
ICCD
digital supply current
24
30
mA
ICCO
TTL output supply current
12
16
mA
ILE
DC integral linearity error
±1
LSB
DLE
DC differential linearity error
±0.5
LSB
fclk(max)
maximum clock frequency
30
32
MHz
B
maximum
3 dB bandwidth (AGC amplier)
12
18
MHz
Ptot
total power dissipation
365
500
mW
TYPE NUMBER
PACKAGE
PINS
PIN POSITION
MATERIAL
CODE
TDA8708A
28
DIP
plastic
SOT117-1
TDA8708AT
28
SO28L
plastic
SOT136-1