FemtoClock
®
Crystal-to-3.3V LVPECL
Clock Generator
G
ENERAL
D
ESCRIPTION
The 843011 is a Fibre Channel Clock Generator.
The 843011 uses a 26.5625MHz crystal to synthesize
106.25MHz or a 25MHz crystal to synthesize 100MHz. The
843011 has excellent <1ps phase jitter performance, over the
637kHz – 10MHz integration range. The 843011 is packaged
in a small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
843011
DATA SHEET
F
EATURES
•
One differential 3.3V LVPECL output
•
Crystal oscillator interface designed for 26.5625MHz
18pF parallel resonant crystal
•
Output frequency: 106.25MHz or 100MHz
•
VCO range: 560MHz - 680MHz
•
RMS phase jitter @ 100MHz, using a 25MHz crystal
(637kHz - 10MHz): 0.80ps (typical)
•
RMS phase noise at 106.25MHz
Phase noise:
Offset
Noise Power
100Hz ................-92.8 dBc/Hz
1kHz ..............-119.6 dBc/Hz
10kHz ..............-129.5 dBc/Hz
100kHz ..............-130.5 dBc/Hz
•
3.3V operating supply
•
Available in lead-free (RoHS 6) package
•
-40°C to 85°C ambient operating temperature
F
REQUENCY
T
ABLE
Crystal (MHz)
26.5625
25
Output Frequency (MHz)
106.25
100
B
LOCK
D
IAGRAM
XTAL_IN
P
IN
A
SSIGNMENT
Phase
Detector
VCO
637.5MHz w/
26.5625MHz Ref.
OSC
XTAL_OUT
÷6
nQ0
Q0
V
CCA
V
EE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
CC
Q0
nQ0
nc
M = ÷24 (fixed)
843011
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
843011 REVISION B 9/25/15
1
©2015 Integrated Device Technology, Inc.
843011 DATA SHEET
T
ABLE
1. P
IN
D
ESCRIPTIONS
Number
1
2
3,
4
5
6, 7
8
Name
V
CCA
V
EE
XTAL_OUT,
XTAL_IN
nc
nQ0, Q0
V
CC
Power
Power
Input
Unused
Output
Power
Type
Description
Analog supply pin.
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
No connect.
Differential clock outputs. LVPECL interface levels.
Core supply pin.
T
ABLE
2. P
IN
C
HARACTERISTICS
Symbol
C
IN
Parameter
Input Capacitance
Test Conditions
Minimum
Typical
4
Maximum
Units
pF
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
2
REVISION B 9/25/15
843011 DATA SHEET
A
BSOLUTE
M
AXIMUM
R
ATINGS
Supply Voltage, V
CC
Inputs, V
I
Outputs, I
O
Continuous Current
Surge Current
Package Thermal Impedance,
θ
JA
Storage Temperature, T
STG
4.6V
-0.5V to V
CC
+ 0.5V
50mA
100mA
101.7°C/W (0 mps)
-65°C to 150°C
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 Charac-
teristics
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect product reliability.
T
ABLE
3A. P
OWER
S
UPPLY
DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
V
CC
V
CCA
I
CCA
I
EE
Parameter
Core Supply Voltage
Analog Supply Voltage
Analog Supply Current
Power Supply Current
included in I
EE
Test Conditions
Minimum
3.135
3.135
Typical
3.3
3.3
Maximum
3.465
3.465
12
93
Units
V
V
mA
mA
T
ABLE
3B. LVPECL DC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, 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 terminated with 50Ω to V
CC
- 2V.
T
ABLE
4. C
RYSTAL
C
HARACTERISTICS
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
25
Test Conditions
Minimum
Typical
Fundamental
26.5625
50
7
MHz
Ω
pF
Maximum
Units
T
ABLE
5. AC C
HARACTERISTICS
,
V
CC
= 3.3V±5%, T
A
= -40°C
TO
85°C
Symbol
F
OUT
tjit(Ø)
t
R
/ t
F
odc
Parameter
Output Frequency
RMS Phase Jitter (Random);
NOTE 1
Output Rise/Fall Time
Output Duty Cycle
106.25MHz;
Integration Range: 637KHz - 10MHz
100MHz;
Integration Range: 637KHz - 10MHz
20% to 80%
300
48
Test Conditions
Minimum
93.33
0.80
0.80
600
52
Typical
Maximum
113.33
Units
MHz
ps
ps
ps
%
NOTE 1: Please refer to the Phase Noise Plot.
REVISION B 9/25/15
3
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
843011 DATA SHEET
T
YPICAL
P
HASE
N
OISE AT
100MH
Z
-10
-20
-30
-40
-50
-60
➤
Filter
100MHz
RMS Phase Noise Jitter
637K to 10MHz = 0.80ps (typical)
0
N
OISE
P
OWER
dBc
Hz
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
1k
10k
Raw Phase Noise Data
➤
Phase Noise Result by adding
a Filter to raw data
100k
1M
10M
100M
T
YPICAL
P
HASE
N
OISE AT
106.25MH
Z
-10
-20
-30
-40
-50
-60
➤
O
FFSET
F
REQUENCY
(H
Z
)
➤
Fibre Channel Filter
106.25MHz
RMS Phase Noise Jitter
637K to 10MHz = 0.80ps (typical)
0
N
OISE
P
OWER
dBc
Hz
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
1k
Raw Phase Noise Data
➤
Phase Noise Result by adding
Fibre Channel Filter to raw data
10k
100k
1M
10M
100M
➤
O
FFSET
F
REQUENCY
(H
Z
)
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
4
REVISION B 9/25/15
843011 DATA SHEET
P
ARAMETER
M
EASUREMENT
I
NFORMATION
3.3V O
UTPUT
L
OAD
AC T
EST
C
IRCUIT
RMS P
HASE
J
ITTER
O
UTPUT
D
UTY
C
YCLE
/P
ULSE
W
IDTH
/P
ERIOD
O
UTPUT
R
ISE
/F
ALL
T
IME
REVISION B 9/25/15
5
FEMTOCLOCKS
®
CRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
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