tda8757a NXP Semiconductors, tda8757a Datasheet - Page 11

• Manufacturer Part Number: tda8757a
• Description: Tda8757a Triple 8-bit Adc 205 Msps
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8. Functional description
9397 750 09549
Preliminary data
8.1 Analog video inputs
Table 3:
This triple high-speed 8-bit ADC is designed to convert RGB/YUV signals, coming
from an analog source, into digital data used by a LCD driver (pixel clock up to
205 MHz).
The RGB/YUV video inputs are externally AC coupled and are internally
DC polarized.
The synchronization signals are also used by the device for the internal PLL and the
gain calibration.
If the green video signal has composite sync (sync on green) it is possible to extract
this composite sync by connecting the green signal to pin IN
the sync pulse amplitude is below 300 mV, the I
logic 1 (see
The composite sync is available at pin SOG
Symbol
V
n.c.
DGND1
OE
PD
CLP
HSYNC
INV
CKEXT
COAST
CKREF
V
n.c.
AGND
CP
CZ
AGND
V
n.c.
GND
CCO(PLL)
CCD1
CCA(PLL)
DP
PLL
PLL
Pin description
Figure
Pin
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
exposed die pad connection
Rev. 01 — 22 March 2002
5). The maximum amplitude for the sync pulse is 600 mV typical.
…continued
Description
PLL output supply voltage
not connected
digital ground 1
output enable; active LOW (when OE is HIGH, the outputs are
high-impedance)
power-down control input (IC is in Power-down mode when
this pin is HIGH)
clamp pulse input (clamp active HIGH)
horizontal synchronization pulse input
PLL clock output inverter control input (invert when HIGH)
external clock input
PLL coast control input
PLL reference clock input
digital supply voltage 1
not connected
PLL analog ground
PLL filter input
PLL filter input
PLL analog ground
PLL analog supply voltage
not connected
O
(TTL level compatible signal).
2
C-bus bit ‘Slevel’ has to be set to
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
Triple 8-bit ADC 205 Msps
SOG
TDA8757A
(AC coupled). When
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