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Maxim Integrated Semiconductor Electronic Components Datasheet


MAX038

High-Frequency Waveform Generator


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MAX038 pdf
AVAILABLE
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 modula-
tion and the generation of sawtooth waveforms.
Frequency modulation and frequency sweeping are
achieved in the same way. The duty cycle and frequen-
cy 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
0°C to +70°C
MAX038CWP
0°C to +70°C
MAX038C/D*
0°C to +70°C
* Contact factory prior to design.
PIN-PACKAGE
20 Plastic DIP
20 SO
Dice
Functional Diagrams
Applications
Precision Function Generators
Voltage-Controlled Oscillators
Frequency Modulators
Pulse-Width Modulators
Phase-Locked Loops
Frequency Synthesizer
FSK Generator—Sine and Square Waves
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.
Pin Configuration
TOP VIEW
REF 1
GND 2
A0 3
A1 4
COSC 5
GND 6
DADJ 7
FADJ 8
GND 9
IIN 10
MAX038
20 V-
19 OUT
18 GND
17 V+
16 DV+
15 DGND
14 SYNC
13 PDI
12 PDO
11 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



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MAX038 pdf
MAX038
High-Frequency Waveform Generator
ABSOLUTE MAXIMUM RATINGS
V+ to GND ...............................................................-0.3V to +6V
DV+ to DGND...........................................................-0.3V to +6V
V- to GND .................................................................+0.3V to -6V
Pin Voltages
IIN, FADJ, DADJ, PDO .....................(V- - 0.3V) to (V+ + 0.3V)
COSC ......................................................................+0.3V to V
A0, A1, PDI, SYNC, REF.............................................-0.3V to V+
GND to DGND ...................................................................±0.3V
Maximum Current into Any Pin ........................................±50mA
OUT, REF Short-Circuit Duration to GND, V+, V- ..................30s
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 11.11mW/°C above +70°C) .........889mW
SO (derate 10.00mW/°C above +70°C) .......................800mW
CERDIP (derate 11.11mW/°C above +70°C) ...............889mW
Operating Temperature Ranges
MAX038C_ _ ......................................................0°C to +70°C
Maximum Junction Temperature . ...................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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 may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, GND = DGND = 0V, V+ = DV+ = 5V, V- = -5V, VDADJ = VFADJ = VPDI = VPDO = 0V, CF = 100pF,
RIN = 25kΩ RL = 1kΩ, CL = 20pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
FREQUENCY CHARACTERISTICS
Maximum Operating Frequency
Frequency Programming
Current
IIN Offset Voltage
Frequency Temperature
Coefficient
Fo
IIN
VIN
ΔFo/°C
Fo/°C
CF 15pF, IIN = 500µA
VFADJ = 0V
VFADJ = -3V
VFADJ = 0V
VFADJ = -3V
Frequency Power-Supply
Rejection
(ΔFo/Fo)
ΔV+
(ΔFo/Fo)
ΔV-
V- = -5V, V+ = 4.75V to 5.25V
V+ = 5V, V- = -4.75V to -5.25V
OUTPUT AMPLIFIER (applies to all waveforms)
Output Peak-to-Peak Symmetry
VOUT
Output Resistance
ROUT
Output Short-Circuit Current
IOUT
SQUARE-WAVE OUTPUT (RL = 100Ω)
Amplitude
VOUT
Rise Time
Fall Time
tR
tF
Duty Cycle
dc
TRIANGLE-WAVE OUTPUT (RL = 100Ω)
Amplitude
Nonlinearity
VOUT
Duty Cycle
dc
SINE-WAVE OUTPUT (RL = 100Ω)
Total Harmonic Distortion
VOUT
THD
Short circuit to GND
10% to 90%
90% to 10%
VDADJ = 0V, dc = tON/t x 100%
FO = 100kHz, 5% to 95%
VDADJ = 0V (Note 1)
CF = 1000pF, FO = 100kHz
MIN TYP MAX UNITS
20.0
2.50
1.25
40.0
±1.0
600
200
±0.4
±0.2
750
375
±2.0
MHz
µA
mV
ppm/°C
±2.00
±1.00
%/V
±4 mV
0.1 0.2
Ω
40 mA
1.9 2.0 2.1 VP-P
12 ns
12 ns
47 50 53
%
1.9 2.0 2.1 VP-P
0.5 %
47 50 53
%
1.9 2.0 2.1 VP-P
2.0 %
2 Maxim Integrated



Part Number MAX038
Description High-Frequency Waveform Generator
Maker Maxim Integrated - Maxim Integrated
Total Page 17 Pages
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