Data Sheet
FS7140-01 / FS7140-01g / FS7145 Programmable Phase-Locked Loop Clock Generator
1.0 Features
2.0 Description
• Extremely flexible and low-jitter phase-locked loop (PLL)
frequency synthesis
The FS7140 / FS7145 is a monolithic CMOS clock gen-
erator/regenerator IC designed to minimize cost and
component count in a variety of electronic systems. Via the I2C-
bus interface, the FS714x can be adapted to many clock
generation requirements.
• No external loop filter components needed
• 150MHz CMOS or 340MHz PECL outputs
• Completely configurable via I2C™-bus
• Up to four FS7140 or FS7145 can be used on a single
I2C-bus
• 3.3V operation
• Independent on-chip crystal oscillator and external
reference input
The length of the reference and feedback dividers, their fine
granularity, and the flexibility of the post divider make the
FS714x the most flexible stand-alone phase-locked loop (PLL)
clock generator available.
• Very low "cumulative" jitter
3.0 Applications
SCL
SDA
1
2
3
4
5
6
7
8
16 CLKN
15 CLKP
14 VDD
SCL
SDA
1
2
3
4
5
6
7
8
16 CLKN
15 CLKP
• Precision frequency synthesis
• Low-frequency clock multiplication
• Video line-locked clock generation
• Laser beam printers (FS7145)
ADDR0
VSS
14
ADDR0
VSS
VDD
13
13
n/c
SYNC
XIN
12 REF
11 VSS
10 n/c
XIN
12 REF
11 VSS
10 n/c
XOUT
ADDR1
VDD
XOUT
ADDR1
VDD
9
9
IPRG
IPRG
Figure 1: Pin Configuration:
16-pin (0.150”) SOIC, 16-pin (5.3mm) SSOP
Sync
SYNC
Control
(FS7145 only)
IPRG
XIN
Loop
Filter
Crystal
Oscillator
XOUT
REF
UP
Reference
Divider
(NR)
CLKP
CLKN
Phase-
Frequency
Detector
Voltage
Controlled
Oscillator
Post
Divider
(NPx)
Charge
Pump
DOWN
CMOS/PECL
Output
ADDR[1:0]
Feedback
Divider (NF)
SCL
SDA
I2C
Interface
Registers
FS7140 / FS7145
Figure 2: Device Block Diagram
AMI Semiconductor - Rev. 3.0
www.amis.com
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