Integrated
Circuit
Systems, Inc.
ICS1523
High-PerformanceProgrammableLine-LockedClockGenerator
General Description
Features
Pixel clock frequencies up to 250 MHz
The ICS1523 is a low-cost but very high-performance
frequency generator for line-locked and genlocked high-
resolution video applications. Using ICSs advanced
low-voltage CMOS mixed-mode technology, the ICS1523
is an effective clock solution for video projectors and dis-
plays at resolutions from VGA to beyond UXGA.
Very low jitter
Dynamic Phase Adjust (DPA) for clock outputs
Balanced PECL differential outputs
Single-ended SSTL_3 clock outputs
Double-buffered PLL/DPAcontrol registers
Independent software reset for PLL/DPA
External or internal loop filter selection
Uses 3.3Vdc. Inputs are 5V-tolerant.
The ICS1523 offers pixel clock outputs in both differential
(to 250 MHz) and single-ended (to 150 MHz) formats.
Dynamic Phase Adjust circuitry allows user control of
the pixel clock phase relative to the recovered sync signal.
A second differential output at half the pixel clock rate
enables deMUXing of multiplexed analog-to-digital con-
verters. The FUNC pin provides either the regenerated
input from the phase-locked loop (PLL) divider chain out-
put or a re-synchronized and sharpened input HSYNC.
I2C-bus serial interface can run at either low speed
(100 kHz) or high speed (400 kHz).
Lock detection
24-pin 300-mil SOIC package
Applications
The advanced PLL uses either its internal programmable
feedback divider or an external divider. The device is pro-
grammed by a standard I2C-bus serial interface and is
available in a 24-pin wide small-outline integrated circuit
(SOIC) package.
LCD monitors and video projectors
Genlocking multiple video subsystems
Frequency synthesis
Block Diagram
Pin Configuration
24-Pin SOIC
I2C-bus is a trademark of Philips Corporation.
Dynamic Phase Adjust is a trademark of Integrated Circuit Systems, Inc.
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
ICS1523 Rev S 5/21/99
information being relied upon by the customer is current and accurate.
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
