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ICS840004AG Datasheet

  • ICS840004AG

  • FEMTOCLOCKS CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

  • 13頁

  • ICS

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PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004
F
EMTO
C
LOCKS
鈩?C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
F
EATURES
鈥?Four LVCMOS/LVTTL outputs, 15鈩?typical output impedance
鈥?Selectable crystal oscillator interface
or LVCMOS single-ended input
鈥?Supports the following input frequencies:
212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz and
53.125MHz
鈥?RMS phase jitter @ 212.5MHz (637KHz - 10MHz):
0.98ps typical
鈥?RMS phase noise at 212.5MHz, V
DDO
= 3.3V
Phase noise:
Offset
Noise Power
100Hz ............... -88.8 dBc/Hz
1KHz .............. -109.0 dBc/Hz
10KHz .............. -116.1 dBc/Hz
100KHz .............. -117.5 dBc/Hz
鈥?Full 3.3V or 3.3V core/2.5V output supply mode
G
ENERAL
D
ESCRIPTION
The ICS840004 is a 4 output LVCMOS/LVTTL
Synthesizer optimized to generate Ethernet
HiPerClockS鈩?/div>
reference clock frequencies and is a member of
the HiPerClocks
TM
family of high performance
clock solutions from ICS. Using a 26.5625MHz,
18pF parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL1:0):
212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and
53.125MHz. The ICS840004 uses ICS鈥?3
rd
generation low phase
noise VCO technology and can achieve 1ps or lower typical
random rms phase jitter, easily meeting Ethernet jitter
requirements. The ICS840004 is packaged in a small 20-pin
TSSOP package.
ICS
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
Input
Frequency
26.5625
26.5625
26.5625
26.5625
26.04166
Inputs
M Divider
F_SEL1 F_SEL0
Value
0
0
24
0
1
1
0
1
0
1
1
24
24
24
24
N Divider
Value
3
4
6
12
4
鈥?0擄C to 70擄C ambient operating temperature
M/N
Ratio Value
8
6
4
2
6
Output
Frequency
Range
212.5
159.375
106.25
53.125
156.25
B
LOCK
D
IAGRAM
OE
Pullup
F_SEL1:0 Pulldown:Pulldown
nPLL_SEL Pulldown
nXTAL_SEL
Pulldown
P
IN
A
SSIGNMENT
2
F_SEL0
nc
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
V
DDA
nc
V
DD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
F_SEL1
GND
Q0
Q1
V
DDO
Q2
Q3
GND
XTAL_IN
XTAL_OUT
XTAL_IN 26.5625MHz
OSC
XTAL_OUT
TEST_CLK Pulldown
0
F_SEL1:0
1
Phase
Detector
00
01
10
11
Q0
1
VCO
0
N
梅3
梅4
梅6
(default)
梅12
Q1
ICS840004
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
Q2
M = 梅24 (fixed)
Q3
G Package
Top View
MR
Pulldown
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
840004AG
www.icst.com/products/hiperclocks.html
REV. A SEPTEMBER 16, 2004
1

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