PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
400MHZ FREQUENCY SYNTHESIZER
ICS844801I-24
G
ENERAL
D
ESCRIPTION
The ICS844801I-24 is a 400MHz Frequency
Synthesizer and a member of the HiPerClocks
TM
HiPerClockS™
family of high performance devices from IDT.
The ICS844801I-24 uses an 18pF par allel
resonant crystal over the range of 21.5625MHz -
25.3125MHz. The ICS844801I-24 has excellent <1ps phase
jitter performance, over the 12kHz - 20MHz integration range.
The ICS844801I-24 is packaged in a small 8-pin TSSOP, making
it ideal for use in systems with limited board space.
F
EATURES
•
One differential LVDS 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 @ 400MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.57ps (typical) @ 3.3V
•
3.3V or 2.5V operating supply
•
-40°C to 85°C ambient operating temperature
•
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
ICS
C
OMMON
C
ONFIGURATION
T
ABLE
Inputs
Crystal Frequency (MHz)
25
25
FREQ_SEL
0
1
M
32
32
N
2
4
Multiplication
Value M/N
16
8
Output Frequency
(MHz)
400
200
B
LOCK
D
IAGRAM
FREQ_SEL
Pullup
P
IN
A
SSIGNMENT
FREQ_SEL N
0
÷2
1
÷4
V
DDA
XTAL_OUT
XTAL_IN
GND
1
2
3
4
8
7
6
5
V
DD
Q
nQ
FREQ_SEL
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
690MHz - 810MHz
Q
nQ
ICS844801I-24
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
M = ÷32
(fixed)
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization
and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT
™
/ ICS
™
LVDS 400MHZ FREQUENCY SYNTHESIZER
1
ICS844801AGI-24 REV A JANUARY 16, 2008
ICS844801I-24
FEMTOCLOCKS™ CRYSTAL-TO-LVDS 400MHZ FREQUENCY SYNTHESIZER
PRELIMINARY
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2, 3
4
5
6, 7
8
Name
V
DDA
XTAL_OUT,
XTAL_IN
GND
FREQ_SEL
nQ, Q
V
DD
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.
Power supply ground.
Frequency select pin. LVCMOS/LVTTL interface levels.
Differential clock outputs. LVDS interface levels.
Core supply pin.
NOTE:
Pullup
refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
R
PULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
IDT
™
/ ICS
™
LVDS 400MHZ FREQUENCY SYNTHESIZER
2
ICS844801AGI-24 REV A JANUARY 16, 2008
ICS844801I-24
FEMTOCLOCKS™ CRYSTAL-TO-LVDS 400MHZ FREQUENCY SYNTHESIZER
PRELIMINARY
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
DD
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Storage Temperature, T
STG
4.6V
-0.5V to V
DD
+ 0.5V
50mA
100mA
-65°C to 150°C
NOTE: Stresses beyond those listed under Absolute
Maximum Ratings may cause per manent damage to the
device. These ratings are stress specifications only. Functional op-
eration 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 ex-
tended periods may affect product reliability.
Package Thermal Impedance,
θ
JA
101.7°C/W (0 mps)
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
V
DD
V
DDA
I
DD
I
DDA
Parameter
Power Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Test Conditions
Minimum
3.135
V
DD
– 0.07
Typical
3.3
3.3
80
7
Maximum
3.465
V
DD
Units
V
V
mA
mA
T
ABLE
3B. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
DD
V
DDA
I
DD
I
DDA
Parameter
Power Supply Voltage
Analog Supply Voltage
Power Supply Current
Analog Supply Current
Test Conditions
Minimum
2.375
V
DD
– 0.07
Typical
2.5
2.5
75
7
Maximum
2.625
V
DD
Units
V
V
mA
mA
T
ABLE
3C. LVCMOS/LVTTL DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V±5%
OR
2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
IH
V
IL
I
IH
I
IL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Test Conditions
V
DD
= 3.3V
V
DD
= 2.5V
V
DD
= 3.3V
V
DD
= 2.5V
V
DD
= V
IN
= 3.465V or 2.625V
V
DD
= 3.465V or 2.625V, V
IN
= 0V
-150
Minimum
2
1.7
-0.3
-0.3
Typical
Maximum
V
DD
+ 0.3
V
DD
+ 0.3
0.8
0.7
5
Units
V
V
V
V
µA
µA
T
ABLE
3D. LVDS DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
V
OD
∆
V
OD
V
OS
∆
V
OS
Parameter
Differential Output Voltage
V
OD
Magnitude Change
Offset Voltage
V
OS
Magnitude Change
Test Conditions
Minimum
Typical
415
40
1.22
50
Maximum
Units
mV
mV
V
mV
NOTE: Please refer to Parameter Measurement Information for output information.
IDT
™
/ ICS
™
LVDS 400MHZ FREQUENCY SYNTHESIZER
3
ICS844801AGI-24 REV A JANUARY 16, 2008
ICS844801I-24
FEMTOCLOCKS™ CRYSTAL-TO-LVDS 400MHZ FREQUENCY SYNTHESIZER
PRELIMINARY
T
ABLE
3D. LVDS DC C
HARACTERISTICS
,
V
DD
= V
DDA
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
V
OD
∆
V
OD
V
OS
∆
V
OS
Parameter
Differential Output Voltage
V
OD
Magnitude Change
Offset Voltage
V
OS
Magnitude Change
Test Conditions
Minimum
Typical
380
40
1.17
50
Maximum
Units
mV
mV
V
mV
NOTE: Please refer to Parameter Measurement Information for output information.
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
21.5625
Test Conditions
Minimum
Typical
Fundamental
25.3125
50
7
1
MHz
Ω
pF
mW
Maximum
Units
T
ABLE
5A. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
f
OUT
Parameter
Output Frequency
200MHz @ Integration Range:
12kHz - 20MHz
400MHz @ Integration Range:
12kHz - 20MHz
20% to 80%
Test Conditions
Minimum
172.5
345
0.62
0.57
305
50
Typical
Maximum
202.5
405
Units
MHz
MHz
ps
ps
ps
%
t
jit(Ø)
t
R
/ t
F
RMS Phase Jitter ( Random);
NOTE 1
Output Rise/Fall Time
odc
Output Duty Cycle
NOTE 1: Please refer to the Phase Noise Plots following this section.
T
ABLE
5B. AC C
HARACTERISTICS
,
V
DD
= V
DDA
= 2.5V±5%, T
A
= -40°C
TO
85°C
Symbol
f
OUT
Parameter
Output Frequency
200MHz @ Integration Range:
12kHz - 20MHz
400MHz @ Integration Range:
12kHz - 20MHz
20% to 80%
Test Conditions
Minimum
172.5
345
0.64
0.57
310
50
Typical
Maximum
202.5
405
Units
MHz
MHz
ps
ps
ps
%
t
jit(Ø)
t
R
/ t
F
RMS Phase Jitter ( Random);
NOTE 1
Output Rise/Fall Time
odc
Output Duty Cycle
NOTE 1: Please refer to the Phase Noise Plots following this section.
IDT
™
/ ICS
™
LVDS 400MHZ FREQUENCY SYNTHESIZER
4
ICS844801AGI-24 REV A JANUARY 16, 2008
ICS844801I-24
FEMTOCLOCKS™ CRYSTAL-TO-LVDS 400MHZ FREQUENCY SYNTHESIZER
PRELIMINARY
T
YPICAL
P
HASE
N
OISE AT
400MH
Z
@ 3.3V
0
-10
-20
-30
-40
-50
-60
-70
ä
SONET Filter
400MHz
RMS Phase Noise Jitter
12kHz to 20MHz = 0.57ps (typical)
N
OISE
P
OWER
dBc
Hz
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
1k
Raw Phase Noise Data
ä
ä
Phase Noise Result by adding
a SONET Filter to raw data
10k
100k
1M
10M
100M
O
FFSET
F
REQUENCY
(H
Z
)
IDT
™
/ ICS
™
LVDS 400MHZ FREQUENCY SYNTHESIZER
5
ICS844801AGI-24 REV A JANUARY 16, 2008
嵌入式系统
