19-0266; Rev 2a; 9/96
IT
TION K
VALUA
E
BLE
AVAILA
High-Frequency Waveform Generator
____________________________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: 0.1Ω
o
Low-Distortion Sine Wave: 0.75%
o
Low 200ppm/°C Temperature Drift
_______________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
waveforms is a 2V
P-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.
MAX038
______________Ordering Information
PART
MAX038CPP
MAX038CWP
MAX038C/D
MAX038EPP
MAX038EWP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Plastic DIP
20 SO
Dice*
20 Plastic DIP
20 SO
*Contact
factory for dice specifications.
________________________Applications
Precision Function Generators
Voltage-Controlled Oscillators
Frequency Modulators
Pulse-Width Modulators
Phase-Locked Loops
Frequency Synthesizer
FSK Generator—Sine and Square Waves
__________________Pin Configuration
TOP VIEW
REF
1
GND
2
A0
3
A1
4
COSC
5
GND
6
DADJ
7
FADJ
8
GND
9
IIN
10
20
V-
19
OUT
18
GND
MAX038
17
V+
16
DV+
15
DGND
14
SYNC
13
PDI
12
PDO
11
GND
DIP/SO
________________________________________________________________
Maxim Integrated Products
1
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
