Rev 2; 4/08
10MHz to 51.84MHz TCXO
DS4026
General Description
Features
The DS4026 is a temperature-compensated crystal
oscillator (TCXO) that provides ±±ppm ꢀreꢁuency staꢂili-
ty over the -40°C to +85°C industrial temperature range.
The DS4026 is also availaꢂle in Stratum 3 versions (see
the Ordering Inꢀormation—Stratum 3 taꢂle). Each device
is ꢀactory caliꢂrated over temperature to achieve the
±±ppm ꢀreꢁuency staꢂility. Standard ꢀreꢁuencies ꢀor the
device include ±0, ±2.8, ±9.44, 20, 38.88, 40, and
5±.84MHz. Contact the ꢀactory ꢀor custom ꢀreꢁuencies.
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-4,m8±.+-MHz
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2
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The DS4026 provides excellent phase-noise characteris-
tics. The output is a push-pull CMOS sꢁuare wave with
symmetrical rise and ꢀall times. In addition, the DS4026
is designed to provide a maximum ꢀreꢁuency deviation
oꢀ less than ±4.6ppm over 20 years. The device also
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2
provides an I C interꢀace to allow pushing and pulling
Pin Configuration
oꢀ the output ꢀreꢁuency ꢂy a minimum oꢀ ±8ppm
(±5ppm ꢀor ±0MHz) with typical ±ppꢂ resolution.
TOP VIEW
The DS4026 implements a temperature-to-voltage con-
version with a nonlinear relationship. The output ꢀrom
the temperature-to-voltage converter is used to drive
the voltage-controlled crystal oscillator to compensate
ꢀor ꢀreꢁuency change.
+
GNDA
1
2
3
4
5
6
7
8
16 V
CCD
V
REF
15 FOUT
14 GNDD
13 SCL
12 SDA
11 GND
10 N.C.
V
CC
The device implements an on-chip temperature sensor
lookup taꢂle, and a digital-to-analog converter (DAC) to
V
OSC
DS4026
2
GNDOSC
N.C.
adjust the ꢀreꢁuency. An I C interꢀace used to commu-
nicate with the DS4026 perꢀorms temperature readings
and ꢀreꢁuency push-pull.
N.C.
Applications
N.C.
9
N.C.
Reꢀerence Clock Generation
Telecom/Datacom/SATCOM
Wireless
Test and Measurement
Ordering Information
OUTPUT (f )
(MHz, CMOS)
C
PART
TEMP RANGE
PIN-PACKAGE
TOP MARK*
0°C to +70°C
-40°C to +85°C
0°C to +70°C
10.00
10.00
12.80
12.80
16 SO
16 SO
16 SO
16 SO
DS4026-ACC
DS4026-ACN
DS4026-BCC
DS4026-BCN
DS4026S+ACC
DS4026S+ACN
DS4026S+BCC
DS4026S+BCN
-40°C to +85°C
DS4026S+ECC
DS4026S+ECN
DS4026S+FCC
DS4026S+FCN
0°C to +70°C
-40°C to +85°C
0°C to +70°C
16.80
16.80
16 SO
16 SO
16 SO
16 SO
DS4026-ECC
DS4026-ECN
DS4026-FCC
DS4026-FCN
16.384
16.384
-40°C to +85°C
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+Denotes a lead(Pꢂ)-ꢀree/RoHS-compliant package.
*The top mark will include a “+” ꢀor a lead(Pꢂ)-ꢀree/RoHS-compliant device.
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