MAXIM DS4000 Technical data

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GENERAL DESCRIPTION

The DS4000 digitally controlled temperature-compen­sated crystal oscillator (DC-TCXO) features a digital
temperature sensor, one fixed-frequency temperature­compensated square-wave output (F

), one

1

programmable temperature-compensated square­wave output (F

), and digital communication for

2

frequency tuning (SDA, SCL).

APPLICATIONS

Reference Oscillators in PLL Circuits
Global Positioning Systems
SATCOM
Telecom
Wireless Base Stations

ORDERING INFORMATION

PART TEMP RANGE PIN-PACKAGE

DS4000
DS4000N

Selector Guide appears end of data sheet.

0°C to +70°C 24 BGA

-40°C to +85°C 24 BGA

DS4000

Digitally Controlled TCXO

FEATURES

§ Aging ≤1.0ppm (First Year)

§ Frequency Stability ±1.0ppm from -40°C to +85°C

§ Frequency Versus Supply Stability of ±1.0ppm per

Volt

Base Frequency is Digitally Tunable by ±10ppm
One Fixed-Frequency Output and One

(n + 1) or 2(n + 1) Division of the Base
Frequency Output

§ Temperature Measurements from -40C° to +85°C
with 10-Bit/+0.25°C Resolution and ±3°C
Accuracy

§ 2-Wire Serial Interface

PIN CONFIGURATION

TOP VIEW

GND

A B C D

SCL

SDA

A0

OSC

N.C.

GND

6

5

4

3

2

1

BGA

F2
V

CC

F1
V

OSC

GND
GND

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata

.

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REV: 072403

DS4000 Digitally Controlled TCXO

ABSOLUTE MAXIMUM RATINGS

Voltage Range on Any Pin Relative to Ground -0.3V to +6.0V
Storage Temperature Range -55°C to +85°C
Operating Voltage Range V

= 5V ±5%

CC

Operating Temperature Range

Commercial 0°C to +70°C
Industrial -40°C to +85°C

Soldering Temperature See IPC/JEDEC J-STD-020A (2x max)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods can affect device reliability.

RECOMMENDED DC OPERATING CONDITIONS

(VCC = 5V ±5%, over the operating temperature range.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage VCC (Notes 1, 2) 4.75 5.0 5.25 V

Oscillator Supply Voltage V

(Notes 1, 2) 4.75 5.0 5.25 V

OSC

Input Logic High VIH (Note 1) 2.2 VCC + 0.3 V

Input Logic Low VIL (Note 1) -0.3 +0.8 V

DC ELECTRICAL CHARACTERISTICS

(VCC = 5V ±5%, over the operating temperature range.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Active Supply Current ICC (Notes 3, 4) 1.5 2 mA

Active Oscillator Supply Current I

Output Logic High 2.4V IOH (Note 1) -1 mA

Output Logic Low 0.4V IOL (Note 1) 4 mA

Input Leakage ILI

I/O Leakage ILO

Temperature Conversion Time t

Note 1: All voltages are referenced to ground.
Note 2: For ±10% operating range, contact factory.
Note 3: Typical values are at +25°C and nominal supplies.
Note 4: These parameters are measured with the outputs disabled.

(Notes 3, 4) 3.5 5.5 mA

OSC

(Note 3) 250 300 ms

CONVT

1

1

mA

mA

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AC ELECTRICAL CHARACTERISTICS: TCXO

(VCC = 5V ±5%, over the operating temperature range.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Frequency

Frequency Stability vs.
Temperature

Frequency Stability vs. Voltage

F1
F

2

DF/T

DF/V

CMOS (Note 5) 10 20 MHz

-1.0 +1.0 ppm

A

(Note 6) ±1.0 ppm/V

DS4000 Digitally Controlled TCXO

Frequency Stability vs. Aging

F1, F2 Rise and Fall Time, 10% to
90%

DF/Yr

t

, tF 4 ns

R

±1.0 ppm/Yr

Max Output Capacitive Load CL 10 pF

Duty Cycle tW / t 40 50 60 %

10Hz -85
100Hz -115

Phase Noise f1 Output (Note 7)

1kHz -129

f

N

dBc/Hz
10kHz -134
100kHz -139

Note 5: F1 is the base frequency as defined by the package markings. F2 is a programmable frequency output. The output frequency of F2 is

derived from the base frequency, F
register. The minimum output frequency is F

Note 6: First year typical.
Note 7: 16.384MHz, 5V, +25°C with one of the two outputs enabled.

, by programming the F2 frequency select register and duty cycle (DC) bit in the TCXO control

1

/ (28 + 1) with DC = 0 and f1 / [2 x (28 + 1)] with DC = 1.

1

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DS4000 Digitally Controlled TCXO

AC ELECTRICAL CHARACTERISTICS—2-WIRE SERIAL INTERFACE

(VCC = 4.75 to 5.25V, TA = -40°C to +85°C)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS

Fast mode 0 400

SCL Clock Frequency f

SCL

Standard mode 0 100

kHz

Bus Free Time Between
a STOP and START
Condition

Hold Time (Repeated)
START Condition

Low Period of SCL
Clock

High Period of SCL
Clock

Setup Time for a
Repeated START
Condition

Data Hold Time t

Data Setup Time t

t

BUF

t

HD:STA

t

LOW

t

HIGH

t

SU:STA

HD:DAT

SU:DAT

Fast mode 1.3

ms

Standard mode 4.7

Fast mode (Note 7) 0.6

Standard mode (Note 7) 4.0

ms

Fast mode 1.3

Standard mode 4.7

ms

Fast mode 0.6

ms

Standard mode 4.0

Fast mode 0.6

ms

Standard mode 4.7

Fast mode (Note 8) 0 0.9

ms

Standard mode (Note 8) 0 0.9

Fast mode (Note 9) 100

ns

Standard mode (Note 9) 250

Rise Time of Both SDA
and SCL

Fall Time of Both SDA
and SCL

Setup Time for STOP
Condition

Capacitive Load for
Each Bus Line

Input Capacitance

Note 7: After this period, the first clock pulse is generated.
Note 8: The maximum t
Note 9: A fast-mode device can be used in a standard mode system, but the requirement t

Note 10: C

the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL
signal, it must output the next data bit to the SDA line t

: Total capacitance of one bus line in pF.

B

has only to be met if the device does not stretch the LOW period (t

HD:DAT

tR

tF

t

SU:STO

CB

CI

Fast mode (Note 9) 20 + 0.1CB 300

Standard mode (Note 9) 20 + 0.1CB 1000

Fast mode (Note 10) 20 + 0.1CB 300

Standard mode (Note 10) 20 + 0.1CB 1000

Fast mode 0.6

Standard mode 4.0

(Note 10) 400 pF

5 pF

+ t

RMAX

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(1000 + 250 = 1250ns) before the SCL line is released.

SU:DAT

) of the SCL signal.

LOW

>250ns must then be met. This is automatically

SU:DAT

ns

ns

ms

Figure 1. Timing Diagram

DS4000 Digitally Controlled TCXO

PIN DESCRIPTION

PIN NAME FUNCTION

1A, 1B, 1C,

1D, 2C, 2D

2A, 2B N.C. No Connection. (Do not connect to ground.)

3A, 3B GND

3C, 3D V

4A, 4B A0 2-Wire Slave Address Input. This pin is used to configure the slave address.

4C, 4D F1 DC-TCXO Frequency Output

5A, 5B SDA

5C, 5D VCC Power Supply. DC power is provided to the device on these pins.

6A, 6B SCL

6C, 6D F2 DC-TCXO Frequency Output

GND Ground. DC power is provided to the device on these pins.

Oscillator Ground. DC power is provided to the oscillator on these pins.

OSC

Oscillator Power Supply. DC power is provided to the oscillator on these pins.

OSC

2-Wire Serial-Data Input/Output. SDA is the input/output pin for the 2-wire serial
interface. The SDA pin is open drain and requires an external pullup resistor.

2-Wire Serial-Clock Input. SCL is used to synchronize data movement on the serial
interface. The SCL pin is open drain and requires an external pullup resistor.

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