DS4026| Datasheet

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Rev 0; 2/07

12.8MHz to 51.84MHz TCXO
General Description
The DS4026 is a temperature-compensated crystal oscillator (TCXO) that provides 1ppm frequency stability over the -40 C to +85 C industrial temperature range. Each device is factory calibrated over temperature 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 custom frequencies. The DS4026 provides excellent phase-noise characteristics. 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 provides an I2C interface to allow pushing and pulling of the output frequency by a minimum of 15ppm typical with typical 1ppb resolution. The DS4026 implements a temperature-to-voltage conversion with a nonlinear relationship. The output from the temperature-to-voltage converter is used to drive the voltage-controlled crystal oscillator to compensate for frequenc
y change. The device implements an on-chip temperature sensor lookup table, and a digital-to-analog converter (DAC) to adjust the frequency. An I2C interface used to communicate with the DS4026 performs temperature readings and frequency push-pull.

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 Through I2C Interface Surface-Mount 16-Pin SO Package Pb Free/RoHS Compliant

DS4026

Pin Configuration
TOP VIEW
GNDA 1 VREF 2 VCC 3 VOSC 4 GNDOSC 5 N.C. 6 N.C. 7 16 VCCD 15 FOUT 14 GNDD 13 SCL

DS4026

12 SDA 11 GND 10 N.C. 9 N.C.

Applications
Reference Clock Generation Telecom/Datacom/SATCOM Wireless Test and Measurement

N.C. 8

Ordering Information
PART DS4026S+BCC DS4026S+BCN DS4026S+HCC DS4026S+HCN DS4026S+JCC DS4026S+JCN TEMP RANGE 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 OUTPUT (fNOM) (MHz, CMOS) 12.8 12.8 19.44 19.44 20.0 20.0 PIN-PACKAGE 16 SO 16 SO 16 SO 16 SO 16 SO 16 SO TOP MARK* DS4026-BCC DS4026-BCN DS4026-HCC DS4026-HCN DS4026-JCC DS4026-JCN

Ordering Information continued at end of data sheet.
+Lead-free package. *The top mark will include a "+" for a lead-free/RoHS-compliant device.

______________________________________________ Maxim Integrated Products

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.