KIT EVALUATION
AVAILABLE
Generator
Description
precision function high-frequency triangle, waveforms with a
. The output frequency range of 0.1Hz to 5V bandgap voltage and capacitor. The
wide range by applying pulse-width modulasawtooth waveforms. sweeping are
. The duty cycle and
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can be selected at code at two output signal for all
is symmetrical around output can drive up
from the internal cycle—regardless of —to synchronize 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-Distortion Sine Wave: 0.75%
♦Low 200ppm/°C Temperature Drift
______________Ordering Information
PART |
TEMP. RANGE |
PIN-PACKAGE |
MAX038CPP |
0°C to +70°C |
20 Plastic DIP |
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MAX038CWP |
0°C to +70°C |
20 SO |
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MAX038C/D |
0°C to +70°C |
Dice* |
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MAX038EPP |
-40°C to +85°C |
20 Plastic DIP |
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MAX038EWP |
-40°C to +85°C |
20 SO |
*Contact factory for dice specifications.
MAX038
________________________Applications |
__________________Pin Configuration |
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Precision Function Generators |
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Voltage-Controlled Oscillators |
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Frequency Modulators |
TOP VIEW |
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Pulse-Width Modulators |
REF |
1 |
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0 |
V- |
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Phase-Locked Loops |
GND |
2 |
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9 |
OUT |
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Frequency Synthesizer |
A0 |
3 |
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8 |
GND |
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FSK Generator—Sine and Square Waves |
A1 |
4 |
MAX038 |
7 |
V+ |
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COSC |
5 |
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6 |
DV+ |
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GND |
6 |
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5 |
DGND |
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DADJ |
7 |
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4 |
SYNC |
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FADJ |
8 |
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3 |
PDI |
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GND |
9 |
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2 |
PDO |
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IIN |
1 |
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1 |
GND |
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DIP/SO |
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________________________________________________________________ Maxim Integrated Products 1 |
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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.
High-Frequency Waveform Generator
MAX038
ABSOLUTE MAXIMUM RATINGS
V+ to GND ................................................................ |
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- 0.3V to +6V |
Continuous Power Dissipation (TA = +70°C) |
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DV+ to DGND........................................................... |
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- 0.3V to +6V |
Plastic DIP (derate 11.11mW/°C above +70°C) |
..........889mW |
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V- to GND ................................................................. |
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+0.3V to -6V |
SO (derate 10.00mW/°C above +70°C)....................... |
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800mW |
Pin Voltages |
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CERDIP (derate 11.11mW/°C above +70°C)............... |
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889mW |
IIN, FADJ, DADJ, PDO ..................... |
(V- - 0.3V) to (V+ + 0.3V) |
Operating Temperature Ranges |
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COSC ..................................................................... |
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+0.3V to V- |
MAX038C_ _ ....................................................... |
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0°C to +70°C |
A0, A1, PDI, SYNC, REF......................................... |
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- 0.3V to V+ |
MAX038E_ _ .................................................... |
-40°C to +85°C |
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GND to DGND ................................................................ |
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±0.3V |
Maximum Junction Temperature ..................................... |
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+150°C |
Maximum Current into Any Pin ......................................... |
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±50mA |
Storage Temperature Range ............................. |
-65°C to +150°C |
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OUT, REF Short-Circuit Duration to GND, V+, V- |
...............30sec |
Lead Temperature (soldering, 10sec) ............................. |
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+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 |
MIN |
TYP |
MAX |
UNITS |
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FREQUENCY CHARACTERISTICS |
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Maximum Operating Frequency |
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Fo |
15pCF ≤ 15pF, IIN = 500µA |
20.0 |
40.0 |
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MHz |
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Frequency Programming |
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IIN |
VFADJ = 0V |
2.50 |
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750 |
µA |
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Current |
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VFADJ = -3V |
1.25 |
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375 |
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IIN Offset Voltage |
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VIN |
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±1.0 |
±2.0 |
mV |
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Frequency Temperature |
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Fo/°C |
VFADJ = 0V |
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600 |
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ppm/°C |
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Coefficient |
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Fo/°C |
VFADJ = -3V |
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200 |
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( Fo/Fo) |
V- = -5V, V+ = 4.75V to 5.25V |
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±0.4 |
±2.00 |
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Frequency Power-Supply |
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V+ |
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%/V |
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Rejection |
( Fo/Fo) |
V+ = 5V, V- = -4.75V to -5.25V |
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±0.2 |
±1.00 |
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V- |
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OUTPUT AMPLIFIER (applies to all waveforms) |
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Output Peak-to-Peak Symmetry |
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VOUT |
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±4 |
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mV |
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Output Resistance |
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ROUT |
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0.1 |
0.2 |
Ω |
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Output Short-Circuit Current |
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IOUT |
Short circuit to GND |
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40 |
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mA |
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SQUARE-WAVE OUTPUT (RL = 100Ω ) |
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Amplitude |
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VOUT |
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1.9 |
2.0 |
2.1 |
VP-P |
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Rise Time |
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tR |
10% to 90% |
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12 |
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ns |
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Fall Time |
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tF |
90% to 10% |
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12 |
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ns |
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Duty Cycle |
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dc |
VDADJ = 0V, dc = tON/t x 100% |
47 |
50 |
53 |
% |
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TRIANGLE-WAVE OUTPUT (RL = 100Ω ) |
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Amplitude |
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VOUT |
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1.9 |
2.0 |
2.1 |
VP-P |
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Nonlinearity |
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Fo = 100kHz, 5% to 95% |
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0.5 |
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% |
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Duty Cycle |
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dc |
VDADJ = 0V (Note 1) |
47 |
50 |
53 |
% |
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SINE-WAVE OUTPUT (RL = 100Ω ) |
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Amplitude |
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VOUT |
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1.9 |
2.0 |
2.1 |
VP-P |
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Total Harmonic Distortion |
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THD |
Duty cycle adjusted to 50% |
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0.75 |
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% |
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Duty cycle unadjusted |
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1.50 |
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2 _______________________________________________________________________________________
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 = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
SYNC OUTPUT |
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Output Low Voltage |
VOL |
ISINK = 3.2mA |
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0.3 |
0.4 |
V |
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Output High Voltage |
VOH |
ISOURCE = 400µA |
2.8 |
3.5 |
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V |
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Rise Time |
tR |
10% to 90%, RL = 3kΩ , CL = 15pF |
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10 |
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Fall Time |
tF |
90% to 10%, RL = 3kΩ , CL = 15pF |
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10 |
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Duty Cycle |
dcSYNC |
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50 |
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% |
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DUTY-CYCLE ADJUSTMENT (DADJ) |
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DADJ Input Current |
IDADJ |
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190 |
250 |
320 |
µA |
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DADJ Voltage Range |
VDADJ |
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±2.3 |
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V |
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Duty-Cycle Adjustment Range |
dc |
-2.3V ≤ VDADJ ≤ 2.3V |
15 |
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85 |
% |
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DADJ Nonlinearity |
dc/VFADJ |
-2V ≤ VDADJ ≤ 2V |
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2 |
4 |
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Change in Output Frequency |
Fo/VDADJ |
-2V ≤ VDADJ ≤ 2V |
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±2.5 |
±8 |
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with DADJ |
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Maximum DADJ Modulating |
FDC |
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2 |
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Frequency |
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FREQUENCY ADJUSTMENT (FADJ) |
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FADJ Input Current |
IFADJ |
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190 |
250 |
320 |
µA |
FADJ Voltage Range |
VFADJ |
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±2.4 |
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V |
Frequency Sweep Range |
Fo |
-2.4V ≤ VFADJ ≤ 2.4V |
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±70 |
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FM Nonlinearity with FADJ |
Fo/VFADJ |
-2V ≤ VFADJ ≤ 2V |
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±0.2 |
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Change in Duty Cycle with FADJ |
dc/VFADJ |
-2V ≤ VFADJ ≤ 2V |
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±2 |
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Maximum FADJ Modulating |
FF |
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2 |
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Frequency |
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VOLTAGE REFERENCE |
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Output Voltage |
VREF |
IREF = 0 |
2.48 |
2.50 |
2.52 |
V |
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Temperature Coefficient |
VREF/°C |
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20 |
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ppm/°C |
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Load Regulation |
VREF/IREF |
0mA ≤ IREF ≤ 4mA (source) |
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1 |
2 |
mV/mA |
-100µA ≤ IREF ≤ 0µA (sink) |
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1 |
4 |
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Line Regulation |
VREF/V+ |
4.75V ≤ V+ ≤ 5.25V (Note 2) |
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2 |
mV/V |
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LOGIC INPUTS (A0, A1, PDI) |
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Input Low Voltage |
VIL |
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0.8 |
V |
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Input High Voltage |
VIH |
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2.4 |
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V |
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Input Current (A0, A1) |
IIL, IIH |
VA0, VA1 = VIL, VIH |
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±5 |
µA |
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Input Current (PDI) |
IIL, IIH |
VPDI = VIL, VIH |
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±25 |
µA |
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POWER SUPPLY |
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Positive Supply Voltage |
V+ |
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4.75 |
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5.25 |
V |
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SYNC Supply Voltage |
DV+ |
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4.75 |
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5.25 |
V |
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Negative Supply Voltage |
V- |
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-4.75 |
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-5.25 |
V |
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Positive Supply Current |
I+ |
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35 |
45 |
mA |
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SYNC Supply Current |
IDV+ |
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1 |
2 |
mA |
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Negative Supply Current |
I- |
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45 |
55 |
mA |
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Note 1: Guaranteed by duty-cycle test on square wave.
Note 2: VREF is independent of V-.
MAX038
_______________________________________________________________________________________ 3
High-Frequency Waveform Generator
MAX038
__________________________________________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.)
100M
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10M |
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1M |
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(Hz) |
100k |
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FREQUENCY |
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10k |
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OUTPUT |
1k |
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100 |
10
1
0.1
OUTPUT FREQUENCY vs. IIN CURRENT
08-MAX038 33pF
100pF
330pF
3.3nF
33nF
100nF
1μF
3.3μF
10μF
47μF
100μF
1 |
10 |
100 |
1000 |
IIN CURRENT (μA)
NORMALIZED OUTPUT FREQUENCY vs. FADJ VOLTAGE
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2.0 |
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09 |
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1.8 |
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MAX038- |
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IIN = 100μA, COSC = 1000pF |
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1.6 |
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NORMALIZED |
1.4 |
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1.2 |
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1.0 |
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OUT |
0.8 |
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0.6 |
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F |
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0.4 |
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0.2 |
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0 |
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-3 |
-2 |
-1 |
0 |
1 |
2 |
3 |
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VFADJ (V) |
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DUTY CYCLE vs. DADJ VOLTAGE
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100 |
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-16B |
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90 |
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MAX038 |
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80 |
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(%) |
70 |
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60 |
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CYCLE |
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50 |
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DUTY |
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40 |
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30 |
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20 |
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10 |
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IIN = 200μA |
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0 |
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-2 |
-1 |
0 |
1 |
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3 |
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-3 |
2 |
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DADJ (V) |
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NORMALIZED OUTPUT FREQUENCY vs. DADJ VOLTAGE
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1.10 |
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17 |
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- |
FREQUENCY |
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IIN = 10μA |
MAX038 |
1.05 |
IIN = 25μA |
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IIN = 50μA |
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1.00 |
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OUTPUT |
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0.95 |
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NORMALIZED |
IIN = 100μA |
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0.90 |
IIN = 250μA |
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IIN = 500μA |
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0.85 |
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DADJ (V)
DUTY-CYCLE LINEARITY ERROR (%)
2.0
1.5
1.0
0.5
0 -0.5 -1.0 -1.5 -2.0 -2.5
DUTY-CYCLE LINEARITY vs. DADJ VOLTAGE
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18- |
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IIN = 500μA |
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MAX038 |
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IIN = 250μA |
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IIN = 100μA |
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IIN = 50μA |
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IIN = 25μA |
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IIN = 10μA |
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-2.0 |
-1.0 |
0 |
1.0 |
1.5 |
2.5 |
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DADJ (V) |
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4 _______________________________________________________________________________________
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.)
SINE-WAVE OUTPUT (50Hz) |
SINE-WAVE OUTPUT (20MHz) |
MAX038
TOP: OUTPUT 50Hz = Fo
BOTTOM: SYNC
IIN = 50μA
CF = 1μF
TRIANGLE-WAVE OUTPUT (50Hz)
IIN = 400μA
CF = 20pF
TRIANGLE-WAVE OUTPUT (20MHz)
TOP: OUTPUT 50Hz = Fo
BOTTOM: SYNC
IIN = 50μA
CF = 1μF
IIN = 400μA
CF = 20pF
SQUARE-WAVE OUTPUT (50Hz)
TOP: OUTPUT 50Hz = Fo
BOTTOM: SYNC
IIN = 50μA
CF = 1μF
_______________________________________________________________________________________ 5