FMS9874 Datasheet, PDF (1/25 Pages) Fairchild Semiconductor – Graphics Digitizer - 3x8-Bit, 108Ms/s Triple Video A/D Converter with Clamps

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FMS9874
Graphics Digitizer
3x8-Bit, 108Ms/s Triple Video A/D Converter with Clamps
Features
• 3-channels
• 108 Ms/s conversion rate
• Programmable Clamps
• 500ps PLL clock jitter
• Adjustable Gain and offset
• Internal Reference Voltage
• I²C/SMBus compatible Serial Port
• 100-pin package
Applications
• Flat panel displays and projectors
• RGB Graphics Processing
Description
As a fully integrated analog interface, the FMS9874 can directly
digitize RGB graphics with resolutions up to 1024 x 768/85Hz
and 1280 x 1024/60Hz; or using alternate pixel sampling,
1600 x 1200/75Hz. ADC sampling clock can be derived from
either an external source or incoming horizontal sync signal
using the internal PLL. Output data is 24-bit RGB. Setup and
control is via registers, accessible through an SMBus/I²C com-
patible serial port.
Input amplitude range is 500–1000mV with either DC or AC
coupling. Lower reference of AC coupled inputs is estab-
lished with input clamps that are either internally generated
or externally provided.
Common to the three channels are clamp pulses, a bandgap
reference voltage and clocks derived from a PLL or an external
source. Digital data levels are 2.5–3.3 volt CMOS compliant.
Power can be derived from a single +3.3 Volt power supply.
Package is a 100-lead MQFP. Performance specifications are
guaranteed over 0°C to 70°C range.
Block Diagram
R_IN
Clamp
Gain &
Offset
A/D
Converter
DR_7-0
G_IN
Clamp
Gain &
Offset
A/D
Converter
DG_7-0
B_IN
Clamp
Gain &
Offset
A/D
Converter
DB_7-0
VREFIN
CLAMP
INVSCK
XCK
HSIN
COAST
LPF
SDA
SCL
A₀
A₁
PWRDN
SCK
Reference
Timing
HS
Generator
PLL
PXCK
ICLAMP
DCK
DCK
HSOUT
Control
ACS_IN
SYNC
STRIPPER
DCS_OUT
VREFOUT
REV. 1.5 11/10/00