General Description

The DS4026 is a temperature-compensated crystal

oscillator (TCXO) that provides ±1ppm frequency sta-

bility over the -40°C to +85°C industrial temperature

range. Each device is factory calibrated over tempera-

ture to achieve the ±1ppm frequency stability. Standard

frequencies for the device include 12.8, 19.44, 20.0,

38.88, 40.0, and 51.84MHz. Contact the factory for cus-

tom frequencies.

The DS4026 provides excellent phase-noise characteris-

tics. The output is a push-pull CMOS square wave with

symmetrical rise and fall times. In addition, the DS4026 is

designed to provide a maximum frequency deviation of

less than ±4.6ppm over 10 years. The device also pro-

output frequency by a minimum of ±15ppm typical with

typical 1ppb resolution.

The DS4026 implements a temperature-to-voltage con-

version with a nonlinear relationship. The output from the

temperature-to-voltage converter is used to drive the volt-

age-controlled crystal oscillator to compensate for fre-

quency change.

The device implements an on-chip temperature sensor

lookup table, and a digital-to-analog converter (DAC) to

cate with the DS4026 performs temperature readings and

frequency push-pull.

Applications

Reference Clock Generation

Wireless

Telecom/Datacom/SATCOM

Test and Measurement

Features

♦ ±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

♦ Surface-Mount 16-Pin SO Package

♦ Pb Free/RoHS Compliant

12.8MHz to 51.84MHz TCXO

______________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

GNDA

FOUT

GNDD

SCL

SDA

GND

N.C.

N.C.

TOP VIEW

SO

N.C.

GNDOSC

N.C.

N.C.

DS4026

Pin Configuration

Rev 0; 2/07

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.

+

Lead-free package.

*

The top mark will include a “+” for a lead-free/RoHS-compliant device.

Ordering Information continued at end of data sheet.

Ordering Information

PART

TEMP RANGE

(MHz, CMOS)

PIN-PACKAGE

TOP MARK*

DS4026S+BCC

0°C to +70°C

12.8

16 SO

DS4026-BCC

DS4026S+BCN

-40°C to +85°C

12.8

16 SO

DS4026-BCN

DS4026S+HCC

0°C to +70°C

19.44

16 SO

DS4026-HCC

DS4026S+HCN

-40°C to +85°C

19.44

16 SO

DS4026-HCN

DS4026S+JCC

0°C to +70°C

20.0

16 SO

DS4026-JCC

DS4026S+JCN

-40°C to +85°C

20.0

16 SO

DS4026-JCN