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ICS1531 Datasheet

  • ICS1531

  • Triple 8-bit MSPS A/D Converters with Line-Locked Clock Gene...

  • 525.76KB

  • 76頁

  • ICS

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Integrated Circuit Systems, Inc.
ICS1531
1531
General Description
The ICS1531 is a high-performance, cost-effective,
3-channel, 8-bit analog-to-digital converter with an
integrated line-locked clock generator. It is part of a family
of chips intended for high-resolution video applications that
use analog inputs, such as LCD monitors, LCD projectors,
plasma displays, and projection TVs. Using ICS's
low-voltage CMOS mixed-signal technology, the ICS1531
is an effective data-capture solution for resolutions from
VGA to UXGA.
The ICS1531 offers analog-to-digital data conversion and
synchronized pixel clock generation at speeds of 100, 140, or
165 MHz (or mega samples per second, MSPS). The
Dynamic Phase Adjust (DPA) circuitry allows end-user
control over the pixel clock phase, relative to the recovered
sync signal and analog pixel data. Either the internal pixel
clock can be used as a capture clock input to the
analog-to-digital converters or an external clock input can be
used. The ICS1531 provides either one or two 24-bit pixels
per clock. An ADCSYNC output pin provides recovered
HSYNC from the pixel clock phase-locked-loop (PLL)
divider chain output, which can be used to synchronize
display enable output.
A clamp signal can be generated internally or provided
through the CLAMP pin. A high-bandwidth video amplifier
with adjustable gain allows fine tuning of the analog signal.
The advanced PLL uses an internal programmable feedback
divider. Two additional, independent programmable PLLs,
each with spread-spectrum functionality, support memory
and panel clock requirements.
ICS1531
Functional
Block Diagram
Document Type:
Data Sheet
Document Stage: Preliminary Product Preview
Triple 8-bit MSPS A/D Converters with Line-Locked Clock Generator
Features
鈥?/div>
3-channel 8-bit analog-to-digital conversion up to 165 MHz
鈥?/div>
Direct connection to analog input data (no external
pre-amplifier circuit needed)
鈥?/div>
Video amplifier: 500-MHz analog bandwidth,
software-adjustable gain
鈥?/div>
Dynamic Phase Adjust (DPA) for software-adjustable
analog sample points
鈥?/div>
Software selectable: One pixel per clock (for 24-bit
pixels) or two pixels per clock (for a total of 48 bits)
鈥?/div>
Internal clamp circuit. Very low jitter.
鈥?/div>
Low-voltage TTL clock outputs, synchronized with
digital pixel data outputs
鈥?/div>
Independent software reset for PLLs and DPA
鈥?/div>
Double-buffered PLL and DPA control registers
鈥?/div>
Two additional PLLs with spread spectrum for memory
and panel clock
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
External/internal loop-filter selection with software
Automatic Power-On Reset (POR) detection
Uses 3.3 VDC. Digital inputs are 5-V tolerant.
Industry-standard 2-wire serial bus interface speeds:
low (100 kHz), high (400 kHz), or ultra (800 kHz)
鈥?/div>
Lock detection available in hardware and software
鈥?/div>
144-pin low-profile quad flat pack (LQFP) package
Applications
鈥?/div>
LCD displays, LCD projectors, plasma displays, and
projection TVs
R ed
G reen
Blue
VS Y NC
CLAMP
CLAMP
CLAMP
PLL
DPA
ADC
ADC
ADC
R A0-RA 7
R B0-RB 7
G A0 -G A7
G B0 -G B7
BA 0-B A 7
BB 0-B B 7
AD C R C LK
AD C S YNC
R EF
H SY N C
SD A
SC L
XTAL In
XTAL O ut
Serial IF
Crystal
Oscillator
POR
PLL
PLL
Spread S pectrum
Spread S pectrum
M C LK
PN LC LK
ICS1531 Rev N 12/1/99
PRODUCT PREVIEW documents contain information on new products in
the sampling or preproduction phase of development. Characteristic data
and other specifications are subject to change without notice.
December, 1999
December 8, 2000 2:31pm

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