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844002AG-01

Description
FEMTOCLOCKS⑩ CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER
File Size207KB,15 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
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844002AG-01 Overview

FEMTOCLOCKS⑩ CRYSTAL-TOLVDS FREQUENCY SYNTHESIZER

FemtoClocks–Crystal-TO-LVDS
Frequency Synthesizer
844002-01
DATA SHEET
Description
The 844002-01 is a 2 output LVDS Synthesizer optimized to
generate Ethernet reference clock frequencies. Using a 25MHz,
18pF parallel resonant crystal, the following frequencies can be
generated based on the 2 frequency select pins (F_SEL[1:0]):
156.25MHz, 125MHz and 62.5MHz. The 844002-01 uses IDT’s
3
rd
generation low phase noise VCO technology and can achieve
<1ps typical rms phase jitter, easily meeting Ethernet jitter
requirements. The 844002-01 is packaged in a small 20-pin
TSSOP package.
Features
Two differential LVDS outputs
Selectable crystal oscillator interface or
single-ended LVCMOS/LVTTL input
Supports the following output frequencies: 156.25MHz,
125MHz, 62.5MHz
VCO range: 560MHz – 680MHz
RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.41ps (typical)
Full 3.3V and 2.5V supply modes
0°C to 70°C ambient operating temperature
Available in lead-free (RoHS 6) package
Block Diagram
Pin Assignment
F_SEL[1:0]
Pulldown
PLL_SEL
Pulldown
F_SEL[1:0]
0 0 ÷4
0 1 ÷5
1 0 ÷10
1 1 not used
2
Q0
1
Q0
nc
V
DDO
Q0
Q0
MR
PLL_SEL
nc
V
DDA
F_SEL0
V
DD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
DDO
Q1
Q1
GND
nc
XTAL_SEL
REF_CLK
XTAL_IN
XTAL_OUT
F_SEL1
REF_CLK
Pulldown
25MHz
1
XTAL_IN
OSC
XTAL_OUT
XTAL_SEL
Pulldown
0
Phase
Detector
VCO
625MHz
(w/25MHz
Reference)
0
Q1
Q1
M = 25 (fixed)
MR
Pulldown
844002-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm
package body
G Package
Top View
844002-01 Rev A 6/9/15
1
©2015 Integrated Device Technology, Inc.

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