IC GEN WAVEFORM HI-FREQ 20-DIP

MAX038CPP

Manufacturer Part NumberMAX038CPP
DescriptionIC GEN WAVEFORM HI-FREQ 20-DIP
ManufacturerMaxim Integrated Products
TypeWaveform Generator
MAX038CPP datasheet
 

Specifications of MAX038CPP

Frequency20MHzVoltage - Supply4.75 V ~ 5.25 V
Current - Supply45mAOperating Temperature0°C ~ 70°C
Package / Case20-DIP (0.300", 7.62mm)Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
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19-0266; Rev 7; 8/07
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 2V
signal that is symmetrical around
P-P
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.
Precision Function Generators
Voltage-Controlled Oscillators
Frequency Modulators
Pulse-Width Modulators
Phase-Locked Loops
Frequency Synthesizer
FSK Generator—Sine and Square Waves
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
♦ 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
PART
MAX038CPP
MAX038CWP
MAX038C/D*
* Contact factory prior to design.
Applications
TOP VIEW
Features
Ordering Information
TEMP RANGE
PIN-PACKAGE
0°C to +70°C
20 Plastic DIP
0°C to +70°C
20 SO
0°C to +70°C
Dice
Pin Configuration
REF
V-
1
20
GND
OUT
2
19
A0
GND
3
18
A1
MAX038
V+
4
17
COSC
DV+
5
16
GND
DGND
6
15
DADJ
SYNC
7
14
FADJ
PDI
8
13
GND
PDO
9
12
IIN
GND
10
11
DIP/SO
1

MAX038CPP Summary of contents

  • Page 1

    ... 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 PART MAX038CPP MAX038CWP MAX038C/D* * Contact factory prior to design. Applications TOP VIEW Features ...

  • Page 2

    High-Frequency Waveform Generator ABSOLUTE MAXIMUM RATINGS V+ to GND ...............................................................-0.3V to +6V DV+ to DGND...........................................................-0. GND .................................................................+0.3V to -6V Pin Voltages IIN, FADJ, DADJ, PDO .....................(V- - 0.3V) to (V+ + 0.3V) COSC ......................................................................+0. ...

  • Page 3

    High-Frequency Waveform Generator ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, GND = DV -5V, V GND R = 25kΩ 1kΩ 20pF ...

  • Page 4

    High-Frequency Waveform Generator (Circuit of Figure DV -5V, V otherwise noted.) OUTPUT FREQUENCY vs. IIN CURRENT 100M 10M 1M 100k 10k 1k 100 IIN CURRENT ( μA) NORMALIZED ...

  • Page 5

    High-Frequency Waveform Generator (Circuit of Figure DV -5V, V otherwise noted.) SINE WAVE THD vs. FREQUENCY 100 1k 10k FREQUENCY (Hz) SINE-WAVE OUTPUT (20MHz) I ...

  • Page 6

    High-Frequency Waveform Generator (Circuit of Figure DV -5V, V otherwise noted.) SQUARE-WAVE OUTPUT (20MHz 400μ 20pF F FREQUENCY MODULATION USING I TOP: OUTPUT BOTTOM _______________________________________________________________________________________ ...

  • Page 7

    High-Frequency Waveform Generator (Circuit of Figure DV -5V, V otherwise noted.) OUTPUT SPECTRUM, SINE WAVE (F = 11.5MHz 15kΩ 2.5V - ...

  • Page 8

    High-Frequency Waveform Generator 5 COSC OSCILLATOR GND FADJ 8 OSCILLATOR CURRENT 7 DADJ GENERATOR 10 IIN REF 1 VOLTAGE REFERENCE * 11, 18 ...

  • Page 9

    High-Frequency Waveform Generator A stable 2.5V reference voltage, REF, allows simple determination of IIN, FADJ, or DADJ with fixed resistors, and permits adjustable operation when potentiometers are connected from each of these inputs to REF. FADJ and/or DADJ can be ...

  • Page 10

    High-Frequency Waveform Generator When the MAX038’s frequency is controlled by a volt- age source ( series with a fixed resistor (R IN output frequency is a direct function of V the above equations. Varying V modulates the oscilla- ...

  • Page 11

    High-Frequency Waveform Generator –5V + FREQUENCY 1 V- REF C1 C3 1μF 1nF MAX038 DADJ 20kΩ 10 IIN 8 FADJ R1 12kΩ 5 COSC GND GND GND Figure 2. ...

  • Page 12

    High-Frequency Waveform Generator Programming DADJ DADJ is similar to FADJ; it has a 250µA constant cur- rent sink to V- that must be furnished by the voltage source. The source is usually an op-amp output, and the temperature coefficient of ...

  • Page 13

    High-Frequency Waveform Generator +5V - CENTER SYNC DV FREQUENCY 1 A0 REF DADJ 10 IIN MAX038 8 OUT FADJ R PD PDI 5 COSC PDO GND ...

  • Page 14

    High-Frequency Waveform Generator +N PHASE DETECTOR EXTERNAL OSC INPUT Figure 4. Phase-Locked Loop Using External Phase Detector EXTERNAL OSC INPUT Figure 5. Phase-Locked Loop Using External Frequency Phase Detector 14 ______________________________________________________________________________________ 14 CENTER SYNC FREQUENCY 1 REF ...

  • Page 15

    High-Frequency Waveform Generator 1kHz 2kHz 4kHz 8kHz 16kHz 32kHz 64kHz 128kHz 256kHz 512kHz 1.024MHz 2.048MHz 4.096MHz 8.192MHz Figure 6. Crystal-Controlled, Digitally Programmed Frequency Synthesizer—8kHz to 16MHz with 1kHz Resolution ______________________________________________________________________________________ OUT1 RFB OUT2 VREF GND VDD MX7541 BIT1 BIT12 BIT2 ...

  • Page 16

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products tor compares the ÷ ...