0.5% downspread spread spectrum clocking. The ICS843301I-
108 has excellent <1ps phase jitter performance, over an
integration range of
900kHz - 7.5MHz.
The device is packaged
in a small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
F
EATURES
•
One differential 3.3V or 2.5V LVPECL output
•
Crystal oscillator interface designed for 20MHz,
18pF parallel resonant crystal
•
Output frequency: 75MHz
•
Supports SSC, 0.5% downspread
•
RMS phase jitter @ 75MHz, using a 20MHz crystal
(900kHz - 7.5MHz): 0.73ps (typical)
•
Full 3.3V or 2.5V operating supply
•
-40°C to 85°C ambient operating temperature
•
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
IC
S
SSC F
UNCTION
T
ABLE
Input
SSC
0 (default)
1
Mode
SSC Off
0.5% Downspread
B
LOCK
D
IAGRAM
20MHz
XTAL_IN
P
IN
A
SSIGNMENT
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q
nQ
SSC
PLL
Phase
Detector
VCO
600MHz
OSC
XTAL_OUT
N Div
÷8
Q
nQ
ICS843301I-108
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
SSC
Pulldown
M Div
÷30
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT
™
/ ICS
™
3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
1
ICS843301BGI-108 REV. A OCTOBER 9, 2007
ICS843301I-108
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC
PRELIMINARY
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2
3, 4
5
6, 7
8
Name
V
CCA
V
EE
XTAL_OUT,
XTAL_IN
SSC
nQ, Q
V
CC
Power
Power
Input
Input
Output
Power
Type
Description
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Pulldown SSC control pin. LVCMOS/LVTTL interface levels.
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