FemtoClock
®
Crystal-to-3.3V, 2.5V
LVPECL 400MHz Frequency Synthesizer
ICS843801I-24
DATA SHEET
General Description
The ICS843801I-24 is a 400MHz Frequency Synthesizer. The
ICS843801I-24 uses an 18pF parallel resonant crystal over the
range of 21.5625MHz - 25.3125MHz. The ICS843801I-24 has
excellent <1ps phase jitter performance, over the 12kHz - 20MHz
integration range. The ICS843801I-24 is packaged in a small 8-pin
TSSOP, making it ideal for use in systems with limited board space.
Features
•
•
•
•
•
•
•
•
One differential 3.3V, 2.5V LVPECL output
Crystal oscillator interface, 18pF parallel resonant crystal
(21.5625MHz - 25.3125MHz)
Output frequency range: 172.5MHz - 202.5MHz, and
345MHz - 405MHz
VCO range: 690MHz – 810MHz
RMS phase jitter at 400MHz, using a 25MHz crystal
(12kHz – 20MHz): 0.88ps (typical), @ 3.3V
Full 3.3V or 2.5V operating supply modes
-40°C to 85°C ambient operating temperature
Available in lead-free (RoHS 6) package
Common Configuration Table
Inputs
Crystal Frequency (MHz)
25
25
FREQ_SEL
0
1 (default)
M
32
32
N
2
4
Multiplication Value
M/N
16
8
Output Frequency (MHz)
400
200
Block Diagram
FREQ_SEL
Pullup
Pin Assignment
V
CCA
XTAL_OUT
XTAL_IN
V
EE
1
2
3
4
8
7
6
5
V
CC
Q
nQ
FREQ_SEL
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
690MHz - 810MHz
FREQ_SEL N
0
÷2
1 (default) ÷4
Q
nQ
M = ÷32
(fixed)
ICS843801I-24
8 Lead TSSOP
4.40mm x 3.0mm x 0.925 package body
G Package
Top View
ICS843801AGI-24 REVISION A AUGUST 10, 2011
1
©2011 Integrated Device Technology, Inc.
ICS843801I-24 Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
Table 1. Pin Descriptions
Number
1
2,
3
4
5
6, 7
8
Name
V
CCA
XTAL_OUT
XTAL_IN
V
EE
FREQ_SEL
nQ, Q
V
CC
Power
Input
Power
Input
Output
Power
Pullup
Type
Description
Analog supply pin
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
Negative supply pin.
Frequency select pin, LVCMOS/LVTTL interface levels.
Differential output pair. LVPECL interface levels.
Core supply pin.
NOTE:
Pullup
refers to internal input resistors. See Table 2,
Pin Characteristics,
for typical values.
Table 2. Pin Characteristics
Symbol
C
IN
R
PULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
k
Ω
ICS843801AGI-24 REVISION A AUGUST 10, 2011
2
©2011 Integrated Device Technology, Inc.
ICS843801I-24 Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
Absolute Maximum Ratings
NOTE: Stresses beyond those listed under
Absolute Maximum Ratings
may cause permanent damage to the device.
These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond
those listed in the
DC Characteristics or AC Characteristics
is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect product reliability.
Item
Supply Voltage, V
CC
Inputs, V
I
XTAL_IN
Other Inputs
Outputs, I
O
Continuos Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
Rating
4.6V
0V to V
CC
-0.5V to V
CC
+ 0.5V
50mA
100mA
129.5°C/W (0 mps)
-65°C to 150°C
DC Electrical Characteristics
Table 3A. Power Supply DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
CC
V
CCA
I
CC
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
3.135
V
CC
– 0.09
Typical
3.3
3.3
Maximum
3.465
V
CC
66
9
72
Units
V
V
mA
mA
mA
Table 3B. Power Supply DC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
CC
V
CCA
I
CC
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Power Supply Current
Test Conditions
Minimum
2.375
V
CC
– 0.09
Typical
2.5
2.5
Maximum
2.625
V
CC
60
9
72
Units
V
V
mA
mA
mA
ICS843801AGI-24 REVISION A AUGUST 10, 2011
3
©2011 Integrated Device Technology, Inc.
ICS843801I-24 Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
Table 3C. LVCMOS/LVTTL DC Characteristics,
V
CC
= 3.3V ± 5% or 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85
°C
Symbol
V
IH
Parameter
Input High Voltage
Test Conditions
V
CC
= 3.3V
V
CC
= 2.5V
Input Low Voltage
Input High Current
Input Low Current
V
CC
= 3.3V
V
CC
= 2.5V
V
CC
= V
IN
= 3.465V or 2.625V
V
CC
= 3.465V or 2.625V, V
IN
= 0V
-150
Minimum
2
1.7
-0.3
-0.3
Typical
Maximum
V
CC
+ 0.3
V
CC
+ 0.3
0.8
0.7
5
Units
V
V
V
V
µA
µA
V
IL
I
IH
I
IL
Table 3D. LVPECL DC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
V
CC
– 1.4
V
CC
– 2.0
0.6
Typical
Maximum
V
CC
– 0.9
V
CC
– 1.7
1.0
Units
V
V
V
NOTE 1: Outputs termination with 50Ω to V
CC
– 2V.
Table 3E. LVPECL DC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°C
Symbol
V
OH
V
OL
V
SWING
Parameter
Output High Voltage; NOTE 1
Output Low Voltage; NOTE 1
Peak-to-Peak Output Voltage Swing
Test Conditions
Minimum
V
CC
– 1.4
V
CC
– 2.0
0.4
Typical
Maximum
V
CC
– 0.9
V
CC
– 1.5
1.0
Units
V
V
V
NOTE 1: Outputs termination with 50Ω to V
CC
– 2V.
Table 4. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
21.5625
Test Conditions
Minimum
Typical
Fundamental
25.3125
50
7
MHz
Maximum
Units
Ω
pF
ICS843801AGI-24 REVISION A AUGUST 10, 2011
4
©2011 Integrated Device Technology, Inc.
ICS843801I-24 Data Sheet
FEMTOCLOCK
®
CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER
AC Electrical Characteristics
Table 5A. AC Characteristics,
V
CC
= 3.3V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°
Symbol
f
OUT
Parameter
Output Frequency
200MHz,
Integration Range: 12kHz – 20MHz
400MHz,
Integration Range: 12kHz – 20MHz
Test Conditions
Minimum
172.5
345
0.87
0.88
Typical
Maximum
202.5
405
1.02
0.98
13
0.18
20% to 80%
200
48
2.1
10
500
52
Units
MHz
MHz
ps
ps
ps
ps
ms
ps
%
tjit(Ø)
RMS Phase Jitter, Random;
NOTE 1
Cycle-to-Cycle Jitter; NOTE 2
RMS Period Jitter
PLL Lock Time
Output Rise/Fall Time
Output Duty Cycle
tjit(cc)
tjit(per)
t
L
t
R
/ t
F
odc
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
NOTE 1: Refer to Phase Noise Plots.
NOTE 2: These parameters are guaranteed by characterization. Not tested in production.
Table 5B. AC Characteristics,
V
CC
= 2.5V ± 5%, V
EE
= 0V, T
A
= -40°C to 85°
Symbol
f
OUT
Parameter
Output Frequency
200MHz,
Integration Range: 12kHz – 20MHz
400MHz,
Integration Range: 12kHz – 20MHz
Test Conditions
Minimum
172.5
345
0.87
0.89
Typical
Maximum
202.5
405
1.05
1.06
16
0.20
20% to 80%
200
48
2.6
10
500
52
Units
MHz
MHz
ps
ps
ps
ps
ms
ps
%
tjit(Ø)
RMS Phase Jitter, Random;
NOTE 1
Cycle-to-Cycle Jitter; NOTE 2
RMS Period Jitter
PLL Lock Time
Output Rise/Fall Time
Output Duty Cycle
tjit(cc)
tjit(per)
t
L
t
R
/ t
F
odc
NOTE: Electrical parameters are guaranteed over the specified ambient operating temperature range, which is established when the device is
mounted in a test socket with maintained transverse airflow greater than 500 lfpm. The device will meet specifications after thermal equilibrium
has been reached under these conditions.
NOTE 1: Refer to Phase Noise Plots.
NOTE 2: These parameters are guaranteed by characterization. Not tested in production.
ICS843801AGI-24 REVISION A AUGUST 10, 2011
5
©2011 Integrated Device Technology, Inc.
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