TDA8758 Datasheet, PDF (2/24 Pages) NXP Semiconductors – YC 8-bit low-power analog-to-digital video interface

Philips Semiconductors
YC 8-bit low-power analog-to-digital
video interface
Product specification
TDA8758
FEATURES
• Two 8-bit ADCs:
– one Luminance or CVBS channel
– one Chrominance channel
• Sampling rate up to 32 MHz
• Binary or two's complement 3-state TTL outputs for
each channel
• Internal reference voltage regulator
• TTL-compatible digital inputs and outputs
• Power dissipation of 530 mW (typical)
• Input selector circuit (five selectable video inputs for
CVBS or YC processing)
• Peak white enable input
• Clamp and Automatic Gain Control (AGC) functions for
Y/CVBS channel (clamping on code 64 and Peak White
level control at code 255)
• Clamp function for C channel (code 128)
• No sample-and-hold circuit required.
APPLICATIONS
• Video signal decoding
• Digital picture processing
• Frame grabbing
• Multimedia with the Philips Desktop Video chip set (and
especially SAA7196 multistandard decoder and scaler).
GENERAL DESCRIPTION
The TDA8758 is an 8-bit video high-speed low-power
analog-to-digital conversion (ADC) interface for YC and
CVBS signal processing. It converts 1-of-3 CVBS input
signals or 1-of-2 YC input signals into binary or two’s
complement words at a sampling rate of 32 MHz.
All analog signal inputs are digitally clamped and an ADC
interface is provided on the Y/CVBS channel. A fast
precharge on clamp and AGC is provided for start-up.
All digital inputs and outputs are TTL compatible.
QUICK REFERENCE DATA
SYMBOL
V_CCA
V_CCD
V_CCO
I_CCA
I_CCD
I_CCO
ILE
DLE
EB
f_clk(max)
B
α_ct
P_tot
PARAMETER
CONDITIONS
analog supply voltage
digital supply voltage
output stages supply voltage
analog supply current
digital supply current
output supply current
DC integral linearity error
C_L = 15 pF
DC differential linearity error
effective bits
(from video input to digital outputs)
maximum clock frequency
f_clk = 32 MHz;
f_i = 4.43 MHz
maximum −3 dB bandwidth
(input preamplifier)
full-scale; 0 dB gain
crosstalk between Y and C channels
and each video input
total power dissipation
MIN.
4.75
4.75
4.75
−
−
−
−
−
−
TYP.
5.0
5.0
5.0
59
28
19
±0.75
±0.4
7.1
MAX.
5.25
5.25
5.25
70
40
28
±1.5
±1.0
−
UNIT
V
V
V
mA
mA
mA
LSB
LSB
bits
30
32
−
−
15
−
MHz
MHz
−
−63
−55
dB
−
530
724
mW
ORDERING INFORMATION
TYPE
NUMBER
TDA8758G
NAME
LQFP48
PACKAGE
DESCRIPTION
plastic low profile quad flat package; 48 leads; body 7 × 7 × 1.4 mm
VERSION
SOT313-2
1996 Feb 01
2