_______________General Description

The MAX038 is a high-frequency, precision function

generator producing accurate, high-frequency triangle,

sawtooth, sine, square, and pulse waveforms with a

minimum of external components. The output frequency

can be controlled over a frequency range of 0.1Hz to

20MHz by an internal 2.5V bandgap voltage

reference and an external resistor and capacitor. The

duty cycle can be varied over a wide range by applying

a ±2.3V control signal, facilitating pulse-width modula-

tion and the generation of sawtooth waveforms.

Frequency modulation and frequency sweeping are

achieved in the same way. The duty cycle and

frequency controls are independent.

Sine, square, or triangle waveforms can be selected at

the output by setting the appropriate code at two

TTL-compatible select pins. The output signal for all

ground. The low-impedance output can drive up

to ±20mA.

The TTL-compatible SYNC output from the internal

oscillator maintains a 50% duty cycle—regardless of

the duty cycle of the other waveforms—to synchronize

other devices in the system. The internal oscillator can

be synchronized to an external TTL clock connected

to PDI.

________________________Applications

Precision Function Generators

Voltage-Controlled Oscillators

Frequency Modulators

Pulse-Width Modulators

Phase-Locked Loops

Frequency Synthesizer

FSK Generator—Sine and Square Waves

____________________________Features

o 0.1Hz to 20MHz Operating Frequency Range

o Triangle, Sawtooth, Sine, Square, and Pulse

Waveforms

o Independent Frequency and Duty-Cycle

Adjustments

o 350 to 1 Frequency Sweep Range

o 15% to 85% Variable Duty Cycle

o Low-Impedance Output Buffer: 0.1

Ω

o Low-Distortion Sine Wave: 0.75%

o Low 200ppm/°C Temperature Drift

______________Ordering Information

*

Contact factory for dice specifications.

High-Frequency Waveform Generator

________________________________________________________________

Maxim Integrated Products

1

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

V-

OUT

GND

V+

A1

A0

GND

REF

TOP VIEW

MAX038

DV+

DGND

SYNC

PDI

FADJ

DADJ

GND

COSC

PDO

GND

IIN

GND

DIP/SO

__________________Pin Configuration

19-0266; Rev 2a; 9/96

PART

TEMP. RANGE

PIN-PACKAGE

MAX038CPP

0°C to +70°C

20 Plastic DIP

MAX038CWP

0°C to +70°C

20 SO

MAX038C/D

0°C to +70°C

Dice*

MAX038EPP

-40°C to +85°C

20 Plastic DIP

MAX038EWP

-40°C to +85°C

20 SO

EVALUATION

KIT

AVAILABLE

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.