ICS843003 Datasheet, PDF (1/17 Pages) Integrated Circuit Systems – FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843003
FEMTOCLOCKS™CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS843003 is a 3 differential output LVPECL
ICS
Synthesizer designed to generate Ethernet refer-
HiPerClockS™ _{ence clock frequencies and is a member of the}
HiPerClocks™ family of high performance clock
solutions from ICS. Using a 31.25MHz or
26.041666MHz, 18pF parallel resonant crystal, the following fre-
quencies can be generated based on the settings of 4 frequency
select pins (DIV_SEL[A1:A0], DIV_SEL[B1:B0]): 625MHz,
312.5MHz, 156.25MHz, and 125MHz. The 843003 has 2 output
banks, Bank A with 1 differential LVPECL output pair and Bank
B with 2 differential LVPECL output pairs.
The two banks have their own dedicated frequency select pins
and can be independently set for the frequencies mentioned
above. The ICS843003 uses ICS’ 3rd generation low phase noise
VCO technology and can achieve 1ps or lower typical rms phase
jitter, easily meeting Ethernet jitter requirements.The ICS843003
is packaged in a small 24-pin TSSOP package.
BLOCK DIAGRAM
OEA ^Pullup
DIV_SELA[1:0]
VCO_SEL ^Pullup
TEST_CLK ^Pulldown
0
XTAL_IN
OSC
1
XTAL_OUT
XTAL_SEL ^Pullup
FB_DIV ^Pulldown
DIV_SELB[1:0]
MR ^Pulldown
OEB ^Pullup
Phase
Detector
VCO
625MHz
FB_DIV
0 = ÷20 (default)
1 = ÷24
FEATURES
• Three 3.3V LVPECL outputs on two banks, A Bank with
one LVPECL pair and B Bank with 2 LVPECL output pairs
• Using a 31.25MHz or 26.041666 crystal, the two output
banks can be independently set for 625MHz, 312.5MHz,
156.25MHz or 125MHz
• Selectable crystal oscillator interface or LVCMOS/LVTTL
single-ended input
• VCO range: 560MHz to 700MHz
• RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz):
0.51ps (typical)
• RMS phase noise at 156.25MHz
Phase noise:
Offset
Noise Power
100Hz ............... -96.8 dBc/Hz
1KHz .............. -119.1 dBc/Hz
10KHz .............. -126.4 dBc/Hz
100KHz .............. -127.0 dBc/Hz
• Full 3.3V supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature available upon request
PIN ASSIGNMENT
DIV_SELB0 1
VCO_SEL 2
MR 3
VCCO_A 4
QA0 ⁵
nQA0 ⁶
OEB ⁷
OEA 8
FB_DIV ⁹
VCCA ^{1 0}
VCC ¹¹
DIV_SELA0 ¹²
24 DIV_SELB1
2 3 VCCO_B
22 QB0
21 nQB0
20 QB1
19 _nQB1
18 XTAL_SEL
17 TEST_CLK
16 _{XTAL_IN}
15 _{XTAL_OUT}
1 4 _VEE
13 _{DIV_SELA1}
ICS843003
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
package body
0 0 ÷1
0 1 ÷2 (default)
0
1 0 ÷4
QA0 ^{G Package}
Top View
nQA0
1 1 ÷5
1
0 0 ÷1
0 1 ÷2
1 0 ÷4 (default)
1 1 ÷5
QB0
nQB0
QB1
nQB1
843003AG
www.icst.com/products/hiperclocks.html
REV. A JULY 27, 2004
1