Integrated
Circuit
Systems, Inc.
General Description Features
ICS1524A
ICS1524A Rev F 05/13/10
Block Diagram
Dual Output Phase Controlled SSTL_3/PECL Clock Generator
• Wide input frequency range
• 8 kHz to 100 MHz
• 250 MHz balanced PECL differential outputs
• 150 MHz single-ended SSTL_3 clock outputs
• Dynamic Phase Adjust (DPA) for DPACLK
outputs
• Software controlled phase adjustment
• 360
o
Adjustment down to 1/64 clock
increments
• External or internal loop filter selection
• Uses 3.3 VDC Inputs are 5 volt tolerant.
•I
2
C-bus serial interface runs at either low speed
(100 kHz) or high speed (400 kHz).
• Hardware and Software PLL Lock detection
The ICS1524A is a low-cost, very high-performance
frequency generator and phase controlled clock synthe-
sizer. It is perfectly suited to phase controlled clock
synthesis and distribution as well as line-locked and
genlocked applications.
The ICS1524A offers two channels of clock phase con-
trolled outputs; CLK and DPACLK. These two output
channels have both 250 MHz PECL differential and 150
MHz SSTL_3 single-ended output pins. The CLK output
channel has a fixed phase relationship to the PLL’s input
and the DPACLK uses the Dynamic Phase Adjust cir-
cuitry to allow control of the clock phase relative to input
signal.
Optionally, the CLK outputs can operate at half the clock
rate and phase aligned with the DPACLK channel, en-
abling deMUXing of multiplexed analog-to-digital
converters. The FUNC pin provides either the regener-
ated input from the phase-locked loop (PLL) divider
chain output or a re-synchronized and sharpened input
HSYNC.
The advanced PLL uses either its internal program-
mable feedback divider or an external divider and is
programmed by a standard I
2
C-bus™ serial interface.
I
2
C-bus is a trademark of Philips Corporation.
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 information being relied
upon by the customer is current and accurate.
Applications
• Generic Frequency Synthesis
• LCD Monitors and Projectors
• Genlocking Multiple Video Systems
HSYNC
OSC
IC
2
DPACLK+/-
FUNC
DPACLK
Loop
Filter
CLK+/-
CLK
Pin Configuration
24 Pin 300-mil SOIC
ICS1524A
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VDDD
VSSD
SDA
SCL
PDEN
EXTFB
HSYNC
EXTFIL
XFILRET
VDDA
VSSA
OSC
IREF
CLK+ (PECL)
C
VSSQ
VDDQ
CLK (SSTL)
CLK (SSTL)
FUNC (SSTL)
LOCK/REF (SSTL)
ICADR
LK– (PECL)
DPACLK+ (PECL)
DPACLK– (PECL)
DPA
2
