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DS4026_0709 Datasheet

Download or read online Maxim Integrated DS4026_0709 10MHz to 51.84MHz TCXO pdf datasheet.



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Rev 1; 9/07
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-
2
vides an I
C interface to allow pushing and pulling of the
output frequency by a minimum of ±8ppm (±5ppm for
10MHz) 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
2
adjust the frequency. An I
C interface used to communi-
cate with the DS4026 performs temperature readings and
frequency push-pull.
Reference Clock Generation
Wireless
Telecom/Datacom/SATCOM
Test and Measurement
PART
TEMP RANGE
0°C to +70°C
DS4026S+BCC
DS4026S+BCN
-40°C to +85°C
DS4026S+HCC
0°C to +70°C
DS4026S+HCN
-40°C to +85°C
DS4026S+JCC
0°C to +70°C
DS4026S+JCN
-40°C to +85°C
Ordering Information continued at end of data sheet.
+ Denotes a lead-free package.
* The top mark will include a “+” for a lead-free/RoHS-compliant device.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
10MHz to 51.84MHz TCXO
o ±1ppm Frequency Accuracy Over -40°C to +85°C
o Standard Frequencies: 12.8, 19.44, 20.0, 38.88,
40.0, 51.84MHz
o Maximum ±4.6ppm Deviation Over 10 Years
o Minimum ±8ppm (±5ppm for 10MHz) Digital
Frequency Tuning Through I
o Surface-Mount 16-Pin SO Package
o Pb Free/RoHS Compliant
TOP VIEW
Applications
OUTPUT (f
)
NOM
(MHz, CMOS)
12.8
12.8
19.44
19.44
20.0
20.0
______________________________________________ Maxim Integrated Products
Features
2
C Interface
Pin Configuration
GNDA
1
16
V
CCD
V
2
15
FOUT
REF
V
3
14
GNDD
CC
V
4
13
SCL
OSC
DS4026
GNDOSC
5
12
SDA
N.C.
6
11
GND
N.C.
7
10
N.C.
N.C.
8
9
N.C.
SO
Ordering Information
PIN-PACKAGE
TOP MARK*
16 SO
DS4026-BCC
16 SO
DS4026-BCN
16 SO
DS4026-HCC
16 SO
DS4026-HCN
16 SO
DS4026-JCC
16 SO
DS4026-JCN
1

Summary of Contents

Page 1

... Maximum ±4.6ppm Deviation Over 10 Years o Minimum ±8ppm (±5ppm for 10MHz) Digital Frequency Tuning Through I o Surface-Mount 16-Pin SO Package o Pb Free/RoHS Compliant TOP VIEW Applications OUTPUT (f ) NOM (MHz, CMOS) 12.8 12.8 19.44 19.44 20.0 20.0 ___ Maxim Integrated Products Features 2 C Interface Pin Configuration GNDA CCD FOUT REF V 3 ...

Page 2

TCXO ABSOLUTE MAXIMUM RATINGS Voltage Range and V CC CCD OSC Relative to Ground...-0.3V to 3.8V Voltage Range on SDA, SCL, and FOUT Relative to Ground...-0. Stresses beyond those listed ...

Page 3

AC ELECTRICAL CHARACTERISTICS (Note 3.135V to 3.465V -40°C to 85°C, unless otherwise noted PARAMETER SYMBOL Frequency Stability vs. Δf Temperature Frequency Stability vs. Voltage Aging, First Year Aging, Years 215 Except 10MHz Frequency ...

Page 4

TCXO TEMPERATURE SENSOR ELECTRICAL CHARACTERISTICS (Note 3.135V to 3.465V -40°C to 85°C, unless otherwise noted PARAMETER SYMBOL Temperature Sensor Accuracy Temperature Sensor Conversion t CONVT Time Temperature Sensor Resolution AC ...

Page 5

AC ELECTRICAL CHARACTERISTICS (continued 3.135V to 3.465V -40°C to 85°C, unless otherwise noted.) (Note PARAMETER SYMBOL Setup Time for STOP Condition t SU:STO Pin Capacitance SDA, SCL (Note 5) Capacitive Load for Each ...

Page 6

TCXO (V 3.3V 25°C, unless otherwise noted ACTIVE-SUPPLY CURRENT vs. POWER-SUPPLY CURRENT 1.6 1.5 1.4 1.3 12.8 51.84 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 3.0 ...

Page 7

PIN NAME 1 GNDA Ground for DAC 2 V Voltage Reference Output. This pin must be decoupled with a 100µF ceramic capacitor to ground. REF Power Supply for Digital Control and Temperature Sensor. This pin must be decoupled with a ...

Page 8

TCXO V CC TEMP SENSOR GND V CC SCL INTERFACE SDA GND V OSC Figure 2. Functional Diagram Detailed Description The DS4026 is a TCXO capable of operating at 3.3V ±5%, and it allows ...

Page 9

The output driver is a CMOS square-wave output with symmetrical rise and fall time. The temperature sensor provides a 12-bit temperature reading with a resolution of 0.0625°C. The sensor is in continuous conversion mode. If DCOMP is set, conver- sions ...

Page 10

TCXO Table 1. Register Map ADDRESS BIT 7 BIT 6 00 DCOMP SIGN 01 02 SIGN 03 In the temperature register (see the Temperature Register (02h03h) table), temperature is represented as a 12-bit code and is accessible ...

Page 11

During data transfer, the data line must remain stable whenever the clock line is high. Changes in the data line while the clock line is high are interpreted as control signals. Accordingly, the following bus conditions have been defined: ...

Page 12

TCXO The DS4026 can operate in the following two modes: Slave receiver mode (write mode): Serial data and clock are received through SDA and SCL. After each byte is received, an acknowledge bit is transmitted. START and ...

Page 13

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ___ 13 © 2007 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation ...

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