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PDF ICS840004 Data sheet ( Hoja de datos )

Número de pieza ICS840004
Descripción CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER
Fabricantes Integrated Circuit Systems　
Logotipo Integrated Circuit Systems Logotipo



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No Preview Available ! ICS840004 Hoja de datos, Descripción, Manual

FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/
LVTTL FREQUENCY SYNTHESIZER
ICS840004
GENERAL DESCRIPTION
The ICS840004 is a 4 output LVCMOS/LVTTL
ICS Synthesizer optimized to generate Ether net
HiPerClockS™ reference clock frequencies and is a member of the
HiPerClocksTM family of high performance clock
solutions from IDT. 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
www.Data5S3h.e1e2t45UM.cHozm. The ICS840004 uses IDT’s 3rd 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.
FEATURES
• Four LVCMOS/LVTTL outputs, 17Ω typical output impedance
• Selectable crystal oscillator interface
or LVCMOS single-ended input
• Supports the following input frequencies: 212.5MHz,
159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
• VCO range: 560MHz - 700MHz
• RMS phase jitter @ 212.5MHz (637kHz - 10MHz):
0.49ps typical, VDDO = 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
FREQUENCY SELECT FUNCTION TABLE
• Full 3.3V or mixed 3.3V core/2.5V output supply mode
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Input Frequency
(MHz)
26.5625
26.5625
26.5625
26.5625
26.04166
F_SEL1
0
0
1
1
0
Inputs
F_SEL0
M Divider
Value
0 24
1 24
0 24
1 24
1 24
N Divider
Value
3
4
6
12
4
M/N Ratio
Value
8
6
4
2
6
Output Frequency
Range (MHz)
212.5
159.375
106.25
53.125 (default)
156.25
BLOCK DIAGRAM
OE Pullup
F_SEL1:0 Pullup:Pullup
nPLL_SEL Pulldown
nXTAL_SEL Pulldown
XTAL_IN 26.5625MHz
OSC 0
XTAL_OUT
REF_CLK Pulldown
1
2
Phase
Detector
VCO
F_SEL1:0
1N
0 0 ÷3
0 1 ÷4
0 1 0 ÷6
1 1 ÷12 (default)
M = ÷24 (fixed)
PIN ASSIGNMENT
F_SEL0 1 20 F_SEL1
nc 2
19 GND
nXTAL_SEL 3
18 Q0
REF_CLK 4 17 Q1
OE 5
16 VDDO
MR 6
15 Q2
nPLL_SEL 7 14 Q3
VDDA 8
13 GND
Q0
nc 9
12 XTAL_IN
VDD 10 11 XTAL_OUT
Q1 ICS840004
20-Lead TSSOP
Q2 6.5mm x 4.4mm x 0.92mm
package body
Q3 G Package
Top View
MR Pulldown
IDT™ / ICS™ LVCMOS FREQUENCY SYNTHESIZER
1
ICS840004AG REV B AUGUST 16, 2006

1 page




ICS840004 pdf
ICS840004
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER
www.DataSheet4U.com
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
10
TYPICAL PHASE NOISE AT 53.125MHZ @3.3V
Fibre Channel Filter
53.125MHz
RMS Phase Jitter (Random)
637kHz to 10MHz = 0.65ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Fibre Channel Filter to raw data
100
1k
10k 100k 1M
10M 100M
OFFSET FREQUENCY (HZ)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
10
TYPICAL PHASE NOISE AT 106.25MHZ @3.3V
Fibre Channel Filter
106.25MHz
RMS Phase Jitter (Random)
637kHz to 10MHz = 0.79ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
Fibre Channel Filter to raw data
100
1k
10k 100k 1M
10M 100M
OFFSET FREQUENCY (HZ)
IDT™ / ICS™ LVCMOS FREQUENCY SYNTHESIZER
5
ICS840004AG REV B AUGUST 16, 2006

5 Page





ICS840004 arduino
ICS840004
FEMTOCLOCKS™ CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER
RELIABILITY INFORMATION
TABLE 6. θ VS. AIR FLOW TABLE FOR 20 LEAD TSSOP
JA
θ by Velocity (Linear Feet per Minute)
JA
www.DataSheet4U.com
Single-Layer PCB, JEDEC Standard Test Boards
Multi-Layer PCB, JEDEC Standard Test Boards
0
114.5°C/W
73.2°C/W
200
98.0°C/W
66.6°C/W
500
88.0°C/W
63.5°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS840004 is: 3796
IDT™ / ICS™ LVCMOS FREQUENCY SYNTHESIZER
11
ICS840004AG REV B AUGUST 16, 2006

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