FS7140-01 Datasheet, PDF (1/15 Pages) AMI SEMICONDUCTOR – Programmable Phase-Locked Loop Clock Generator

FS7140-01 / FS7140-01g / FS7145 Programmable Phase-Locked Loop Clock Generator Data Sheet
1.0 Features
• Extremely flexible and low-jitter phase-locked loop (PLL)
frequency synthesis
• 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
• Very low "cumulative" jitter
SCL 1
SDA 2
ADDR0 3
VSS 4
XIN 5
XOUT 6
ADDR1 7
VDD 8
16 CLKN
SCL 1
15 CLKP
SDA 2
14 VDD ADDR0 3
13 n/c
VSS 4
12 REF
XIN 5
11 VSS
XOUT 6
10 n/c
ADDR1 7
9 IPRG
VDD 8
16 CLKN
15 CLKP
14 VDD
13 SYNC
12 REF
11 VSS
10 n/c
9 IPRG
Figure 1: Pin Configuration:
16-pin (0.150”) SOIC, 16-pin (5.3mm) SSOP
2.0 Description
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.
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.
3.0 Applications
• Precision frequency synthesis
• Low-frequency clock multiplication
• Video line-locked clock generation
• Laser beam printers (FS7145)
SYNC
(FS7145 only)
XIN
XOUT
REF
Crystal
Oscillator
ADDR[1:0]
SCL
SDA
I²C
Interface
Loop
Filter
Sync
Control
IPRG
Reference
Divider
(N_R)
Registers
Phase-
Frequency
Detector
UP
Charge
Pump
DOWN
Voltage
Controlled
Oscillator
Feedback
Divider (N_F)
Post
Divider
(N_Px)
CMOS/PECL
Output
FS7140 / FS7145
CLKP
CLKN
Figure 2: Device Block Diagram
AMI Semiconductor - Rev. 3.0
www.amis.com
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