MAX038
High-Frequency Waveform Generator
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 modulation 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
waveforms is a 2VP-P signal that is symmetrical around
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.
Features
♦ 0.1Hz to 20MHz Operating Frequency Range
♦ Triangle, Sawtooth, Sine, Square, and Pulse
Waveforms
♦ Independent Frequency and Duty-Cycle
Adjustments
♦ 350 to 1 Frequency Sweep Range
♦ 15% to 85% Variable Duty Cycle
♦ Low-Impedance Output Buffer: 0.1Ω
♦ Low 200ppm/°C Temperature Drift
Ordering Information
PART
TEMP RANGE
MAX038CPP
PIN-PACKAGE
0°C to +70°C
20 Plastic DIP
MAX038CWP
0°C to +70°C
20 SO
MAX038C/D*
0°C to +70°C
Dice
* Contact factory prior to design.
Functional Diagrams
Applications
Pin Configuration
Precision Function Generators
Voltage-Controlled Oscillators
Frequency Modulators
Pulse-Width Modulators
Phase-Locked Loops
Frequency Synthesizer
FSK Generator—Sine and Square Waves
TOP VIEW
REF 1
20 V-
GND 2
19 OUT
A0 3
18 GND
A1 4
MAX038
COSC 5
17 V+
16 DV+
GND 6
15 DGND
DADJ 7
14 SYNC
FADJ 8
13
GND 9
12 PDO
IIN 10
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
11
PDI
GND
DIP/SO
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-0266; Rev 7; 8/07
