Rev 0; 2/07
12.8MHz to 51.84MHz TCXO
DS4026
General Description
Features
The DS4026 is a temperature-compensated crystal
oscillator (TCXO) that provides ±±ppm ꢀreꢁuency sta-
bility over the -40°C to +85°C industrial temperature
range. Each device is ꢀactory calibrated over tempera-
ture to achieve the ±±ppm ꢀreꢁuency stability. Standard
ꢀreꢁuencies ꢀor the device include ±2.8, ±9.44, 20.0,
38.88, 40.0, and 5±.84MHz. Contact the ꢀactory ꢀor cus-
tom ꢀreꢁuencies.
♦
1ppm Frequency Accuracy Over -40°C to +85°C
♦ Standard Frequencies: 12.8, 19.44, 20.0, 38.88,
40.0, 51.84MHz
♦ Maximum 4.6ppm Deviation Over 10 Years
♦ Minimum 8ppm Digital Frequency Tuning
Through I2C Interface
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 ±0 years. The device also pro-
vides an I2C interꢀace to allow pushing and pulling oꢀ the
output ꢀreꢁuency by a minimum oꢀ ±±5ppm typical with
typical ±ppb resolution.
♦ Surface-Mount 16-Pin SO Package
♦ Pb Free/RoHS Compliant
Pin Configuration
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 volt-
age-controlled crystal oscillator to compensate ꢀor ꢀre-
ꢁuency 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 table, and a digital-to-analog converter (DAC) to
adjust the ꢀreꢁuency. An I2C interꢀace used to communi-
cate with the DS4026 perꢀorms temperature readings and
ꢀreꢁuency push-pull.
V
OSC
DS4026
GNDOSC
N.C.
N.C.
Applications
N.C.
9
N.C.
Reꢀerence Clock Generation
Telecom/Datacom/SATCOM
Wireless
SO
Test and Measurement
Ordering Information
OUTPUT (f
(MHz, CMOS)
)
NOM
PART
TEMP RANGE
PIN-PACKAGE
TOP MARK*
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
12.8
16 SO
16 SO
16 SO
16 SO
16 SO
16 SO
DS4026-BCC
DS4026-BCN
DS4026-HCC
DS4026-HCN
DS4026-JCC
DS4026-JCN
DS4026S+BCC
DS4026S+BCN
DS4026S+HCC
DS4026S+HCN
DS4026S+JCC
DS4026S+JCN
12.8
19.44
19.44
20.0
20.0
Ordering Information continued at end of data sheet.
+Lead-ꢀree package.
*The top mark will include a “+” ꢀor a lead-ꢀree/RoHS-compliant device.
______________________________________________ Maxim Integrated Products
1
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.