MAX038CPP ,High-Frequency Waveform GeneratorFeaturesThe MAX038 is a high-frequency, precision function' 0.1Hz to 20MHz Operating Frequency Rang ..
MAX038CPP ,High-Frequency Waveform GeneratorApplications __________________Pin ConfigurationPrecision Function GeneratorsVoltage-Controlled Osc ..
MAX038CPP+ ,High-Frequency Waveform GeneratorApplications Pin ConfigurationPrecision Function GeneratorsVoltage-Controlled OscillatorsTOP VIEWFr ..
MAX038EPP ,High-Frequency Waveform GeneratorELECTRICAL CHARACTERISTICS(Circuit of Figure 1, GND = DGND = 0V, V+ = DV+ = 5V, V- = -5V, V = V = V ..
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MAX337CAI ,16-Channel/Dual 8-Channel, Low-Leakage, CMOS Analog MultiplexersGeneral Description ________
MAX337CAI ,16-Channel/Dual 8-Channel, Low-Leakage, CMOS Analog MultiplexersGeneral Description ________
MAX038CPP-MAX038EPP
High-Frequency Waveform Generator
_______________General DescriptionThe 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 2VP-Psignal 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.
________________________ApplicationsPrecision Function Generators
Voltage-Controlled Oscillators
Frequency Modulators
Pulse-Width Modulators
Phase-Locked Loops
Frequency Synthesizer
FSK Generator—Sine and Square Waves
____________________________Features0.1Hz to 20MHz Operating Frequency RangeTriangle, Sawtooth, Sine, Square, and Pulse
WaveformsIndependent Frequency and Duty-Cycle
Adjustments350 to 1Frequency Sweep Range15% to 85% Variable Duty CycleLow-Impedance Output Buffer: 0.1ΩLow-Distortion Sine Wave: 0.75%Low 200ppm/°C Temperature Drift
______________Ordering Information*Contact factory for dice specifications.
MAX038
__________________Pin Configuration
MAX038
High-Frequency Waveform Generator
ABSOLUTE MAXIMUM RATINGS
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= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°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.
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-...............30sec
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
MAX038E_ _....................................................-40°C to +85°C
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX038
High-Frequency Waveform Generator
ELECTRICAL CHARACTERISTICS (continued)(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= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Note 1:Guaranteed by duty-cycle test on square wave.
Note 2:VREFis independent of V-.
MAX038
High-Frequency Waveform Generator
__________________________________________Typical Operating Characteristics(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1kΩ, CL= 20pF, TA = +25°C, unless
otherwise noted.)
MAX038
High-Frequency Waveform Generator
____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1kΩ, CL= 20pF, TA = +25°C, unless
otherwise noted.)
MAX038
High-Frequency Waveform Generator
____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1kΩ, CL= 20pF, TA = +25°C, unless
otherwise noted.)
MAX038
High-Frequency Waveform Generator
______________________________________________________________Pin Description*The five GND pins are not internally connected. Connect all five GND pins to a quiet ground close to the device. A ground plane is
recommended (see Layout Considerations).
MAX038
12B
____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, VDADJ= VFADJ= VPDI= VPDO= 0V, RL= 1kΩ, CL= 20pF, TA = +25°C, unless
otherwise noted.)
MAX038
_______________Detailed DescriptionThe MAX038 is a high-frequency function generator
that produces low-distortion sine, triangle, sawtooth, or
square (pulse) waveforms at frequencies from less than
1Hz to 20MHz or more, using a minimum of external
components. Frequency and duty cycle can be inde-
pendently controlled by programming the current, volt-
age, or resistance. The desired output waveform is
selected under logic control by setting the appropriate
code at the A0 and A1 inputs. A SYNC output and
phase detector are included to simplify designs requir-
ing tracking to an external signal source.
The MAX038 operates with ±5V ±5% power supplies.
The basic oscillator is a relaxation type that operates by
alternately charging and discharging a capacitor, CF,
with constant currents, simultaneously producing a tri-
angle wave and a square wave (Figure 1). The charg-
ing and discharging currents are controlled by the cur-
rent flowing into IIN, and are modulated by the voltages
applied to FADJ and DADJ. The current into IIN can be
varied from 2µA to 750µA, producing more than two
decades of frequency for any value of CF. Applying
±2.4V to FADJ changes the nominal frequency (with
VFADJ= 0V) by ±70%; this procedure can be used for
fine control.
Duty cycle (the percentage of time that the output wave-
form is positive) can be controlled from 10% to 90% by
applying ±2.3V to DADJ. This voltage changes the CF
charging and discharging current ratio while maintaining
nearly constant frequency.
High-Frequency Waveform GeneratorFigure 1. Block Diagram and Basic Operating Circuit
