General Description
The DS4077 is an integrated voltage-controlled crystal
oscillator (VCXO) module designed to provide reference
clock generation in base stations, telecom/datacom, and
wireless applications. The DS4077 is developed using a
fundamental quartz crystal plus a unique integrated cir-
cuit design. The internal fundamental quartz crystal
determines the frequency of operation. Custom frequen-
cies are available. Contact the factory for availability.
The DS4077 is designed for use with applications requir-
ing low phase noise and jitter. Jitter performance of bet-
ter than 1ps RMS is achieved over the 12kHz to 80MHz
range. Phase noise performance of better than
-130dBc/Hz at 1kHz is achieved with this design.
Features
77.76MHz (f
NOM
) Frequency
3.135V to 3.465V Operation
Low Jitter: <1ps RMS
69ppm Absolute Pull Range (APR)
LVCMOS Output Buffer
Minimum 110ppm Tuning Range (+25C)
Available in Commercial or Industrial
Temperature Ranges
14mm x 9mm x 3.06mm Plastic LGA Package
DS4077
77.76MHz VCXO
______________________________________________ Maxim Integrated Products
1
N.C.
N.C.
N.C.
N.C.
LVCMOS
V
SS
1
9
8
7
6
V
DD
5
N.C.
VC
(TRANSFER-MOLDED PLASTIC PACKAGE)
LGA
TOP VIEW
2
3
4
DS4077
Pin Configuration
Applications
Rev 0; 8/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP MARK*
DS4077L-0C0
0C to +70C
9 LGA
DS4077L-0C0
DS4077L-0CN
-40C to +85C
9 LGA
DS4077L-0CN
*The top mark includes an "N" for industrial temperature grade
devices.
Clock-Data Recovery in Telecom/Datacom
Applications
Data Retiming
Reference Clock Generation in Base Stations
and Wireless Applications
Block Diagram
X1
V
DD
LVCMOS
OUTPUT
VARACTOR
OSC
CONTROL
CRYSTAL
VC
X2
DS4077
DS4077
77.76MHz VCXO
2
_____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 3.135V to 3.465V, T
A
= -40C to +85C or 0C to +70C, unless otherwise noted.) (Typical values at +25C, V
DD
= 3.3V,
unless otherwise noted.) (Note 1)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VC, V
DD
, LVCMOS Output .......................................-0.3V, +3.6V
Operating Temperature Range
(noncondensing) ..............................................-40C to +85C
Junction Temperature ......................................................+150C
Thermal Resistance
Junction to Ambient .................................................91.06C/W
Junction to Case ......................................................44.51C/W
Storage Temperature Range .............................-55C to +125C
Soldering Temperature
(reflow, 2 passes max)....See IPC/JEDEC STD-020 Specification
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
DD
Operating Supply Range
V
DD
3.135
3.3
3.465
V
V
DD
Supply Current
I
DD
Output open
20
30
mA
Frequency
f
OUT
VC = 1.6V, V
DD
= 3.3V, T
A
= +25C,
LOAD = 10pF
f
NOM
8ppm
f
NOM
f
NOM
+8ppm
MHz
Frequency vs. V
DD
Sensitivity
V
DD
ppm
V
DD
= 3.3V 5%
-3.5
+11.5
ppm
Frequency vs. Load Sensitivity
LOADpmm
10pF to 20pF (Note 2)
-1
ppm
Frequency vs. Temperature
TEMPppm
From +25C
-20
+20
ppm
VC Voltage Range
VC
RANGE
0.3
1.60
2.8
V
Frequency Tuning Sensitivity
VC
SEN
(Note 3)
41
164
ppm/V
Tuning Voltage Bandwidth
VC
BW
(Note 2)
10
kHz
Absolute Pull Range
f
TUNE
VC = 0.3V to 2.8V, LOAD = 10pF
-69
+69
ppm
VC Input Leakage
I
LCV
VC = 0V to V
DD
-500
+500
nA
Aging, First Year
AGEppm
-5
+5
ppm
Aging, Years 010
t
AGE
Total aging
-10
+10
ppm
DS4077
77.76MHz VCXO
_____________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 3.135V to 3.465V, T
A
= -40C to +85C or 0C to +70C, unless otherwise noted.) (Typical values at +25C, V
DD
= 3.3V,
unless otherwise noted.) (Note 1)
Note 1: Limits at -40C are guaranteed by design and not production tested.
Note 2: Guaranteed by design and not production tested.
Note 3: Tuning linearity typically better than 10%.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LVCMOS OUTPUT
Output Logic 0
V
OL
Output Current -450A
0
0.4
V
Output Logic 1
V
OH
Output Current +450A
V
DD
-
0.8V
V
DD
V
Output Rise Time
t
R
Load condition: 10pF to ground; 10% to
90% V
DD
(Note 2)
2
ns
Output Fall Time
t
F
Load condition: 10pF to ground; 90% to
10% V
DD
(Note 2)
2
ns
Duty Cycle
D
CYC
Load condition: 10pF, V
DD
/ 2 (Note 2)
40
60
%
Harmonics
H
V
DD
= 3.3V, T
A
= +25C (Note 2)
-18
-8
dBc/Hz
SSB PHASE NOISE AND JITTER, V
DD
= 3.3, T
A
= +25C (Note 2)
10Hz Offset
-74
100Hz Offset
-105
1kHz Offset
-130
10kHz Offset
-147
100kHz Offset
LVCMOS
-150
dBc/Hz
Jitter (12kHz to 80MHz)
1
ps
RMS
Pin Description
PIN
NAME
FUNCTION
1
VC
VCXO Control Voltage
2, 5, 7, 8, 9
N.C.
No Connection
3
V
SS
Ground
4
LVCMOS
LVCMOS Output
6
V
DD
DC Power
DS4077
77.76MHz VCXO
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.
Package Information
(For the latest package information, go to
www.maxim-ic.com/DallasPackInfo
and click on package drawing
56-G6034-001
.)
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25C, unless otherwise noted.)
FREQUENCY vs. TEMPERATURE
DS4077 toc01
TEMPERATURE (C)
f
OUT
DEVIATION (ppm)
60
40
20
0
-20
-8
-6
-4
-2
0
2
4
6
8
10
-10
-40
80
f
OUT
= 77.76MHz
OUTPUT FREQUENCY
vs. LOAD CAPACITANCE vs. VC
DS4077 toc02
VC (V)
f
OUT
DEVIATION (ppm)
2.8
1.8
2.3
1.3
0.8
-50
-75
-100
125
100
75
50
25
0
-25
150
-125
0.3
C
L
= 0pF
C
L
= 20pF
f
OUT
= 77.76MHz
OUTPUT FREQUENCY
vs. SUPPLY VOLTAGE vs. VC
DS4077 toc03
V
DD
(V)
f
OUT
DEVIATION FROM V
DD
= 3.3V (ppm)
3.410
3.465
3.355
3.190
3.245
3.300
-10
-15
15
10
5
0
-5
20
-20
3.135
f
OUT
= 77.76MHz
T
A
= +25C
VC = 0.3V
VC = 2.8V
VC = 1.6V
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