Maxim MAX038CPP, MAX038EPP, MAX038CWP, MAX038C-D, MAX038EWP Datasheet

_______________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 modula­tion 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.

________________________Applications

Precision Function Generators
Voltage-Controlled Oscillators
Frequency Modulators
Pulse-Width Modulators
Phase-Locked Loops
Frequency Synthesizer
FSK Generator—Sine and Square Waves

____________________________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

*

Contact factory for dice specifications.

MAX038

High-Frequency Waveform Generator

________________________________________________________________

Maxim Integrated Products

1

20
19
18
17
16
15
14
13
12
11

1
2
3
4
5
6
7
8
9

10

V­OUT
GND
V+

A1

A0

GND

REF

TOP VIEW

MAX038

DV+
DGND
SYNC

PDI

FADJ

DADJ

GND

COSC

PDO

GND

IIN

GND

DIP/SO

__________________Pin Configuration

19-0266; Rev 2a; 9/96

PART TEMP. RANGE PIN-PACKAGE

MAX038CPP 0°C to +70°C 20 Plastic DIP
MAX038CWP 0°C to +70°C 20 SO
MAX038C/D 0°C to +70°C Dice*
MAX038EPP -40°C to +85°C 20 Plastic DIP
MAX038EWP -40°C to +85°C 20 SO

EVALUATION KIT

AVAILABLE

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

MAX038

High-Frequency Waveform Generator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, GND = DGND = 0V, V+ = DV+ = 5V, V- = -5V, V

DADJ

= V

FADJ

= V

PDI

= V

PDO

= 0V, CF= 100pF,

RIN= 25kΩ, RL= 1kΩ, CL= 20pF, TA= T

MIN

to T

MAX

, 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.

PARAMETER SYMBOL MIN TYP MAX UNITS

Frequency Temperature
Coefficient

∆Fo/°C

200

ppm/°C

600

IIN Offset Voltage V

IN

±1.0 ±2.0 mV

Frequency Programming
Current

I

IN

1.25 375

µA

(∆Fo/Fo)

∆V+

±0.4 ±2.00

Frequency Power-Supply
Rejection

(∆Fo/Fo)

∆V-

±0.2 ±1.00

%/V

Output Peak-to-Peak Symmetry V

OUT

±4 mV

Maximum Operating Frequency F

o

20.0 40.0 MHz

2.50 750

Output Resistance R

OUT

0.1 0.2 Ω

Output Short-Circuit Current I

OUT

40 mA

Amplitude V

OUT

1.9 2.0 2.1 V

P-P

Rise Time t

R

12 ns

Fall Time t

F

12 ns

Duty Cycle dc 47 50 53 %

Amplitude V

OUT

1.9 2.0 2.1 V

P-P

Nonlinearity 0.5 %
Duty Cycle dc 47 50 53 %

CONDITIONS

V

FADJ

= -3V

V

FADJ

= 0V

V

FADJ

= -3V

V- = -5V, V+ = 4.75V to 5.25V

V+ = 5V, V- = -4.75V to -5.25V

Short circuit to GND

10% to 90%
90% to 10%
V

DADJ

= 0V, dc = tON/t x 100%

15pCF ≤ 15pF, IIN= 500µA
V

FADJ

= 0V

Fo= 100kHz, 5% to 95%
V

DADJ

= 0V (Note 1)

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 (T

A

= +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

Amplitude

V

OUT

1.9 2.0 2.1 V

P-P

Duty cycle adjusted to 50% 0.75

Total Harmonic Distortion THD

Duty cycle unadjusted 1.50

%

Fo/°C

FREQUENCY CHARACTERISTICS

OUTPUT AMPLIFIER (applies to all waveforms)

SQUARE-WAVE OUTPUT (RL= 100Ω)

TRIANGLE-WAVE OUTPUT (RL= 100Ω)

SINE-WAVE OUTPUT (RL= 100Ω)

MAX038

High-Frequency Waveform Generator

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, GND = DGND = 0V, V+ = DV+ = 5V, V- = -5V, V

DADJ

= V

FADJ

= V

PDI

= V

PDO

= 0V, CF= 100pF,

RIN= 25kΩ, RL= 1kΩ, CL= 20pF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.)

Note 1: Guaranteed by duty-cycle test on square wave.
Note 2: V

REF

is independent of V-.

PARAMETER

DADJ Nonlinearity

SYMBOL MIN TYP MAX

dc/V

FADJ

2 4

UNITS

%

Duty Cycle dc

SYNC

50 %

Fall Time t

F

10 ns

Rise Time t

R

10 ns

Change in Output Frequency
with DADJ

DADJ Input Current I

DADJ

190 250 320 µA

DADJ Voltage Range V

DADJ

±2.3 V

Fo/V

DADJ

±2.5 ±8 %

Duty-Cycle Adjustment Range dc 15 85 %

Maximum DADJ Modulating
Frequency

F

DC

2 MHz

Output Low Voltage

FADJ Input Current I

FADJ

190 250 320 µA

FADJ Voltage Range V

FADJ

±2.4 V

Frequency Sweep Range

V

OL

0.3 0.4 V

F

o

±70 %

FM Nonlinearity with FADJ

Output High Voltage

Fo/V

FADJ

±0.2 %

V

OH

2.8 3.5 V

Change in Duty Cycle with FADJ dc/V

FADJ

±2 %

Output Voltage V

REF

2.48 2.50 2.52 V

CONDITIONS

-2V ≤ V

DADJ

≤ 2V

90% to 10%, RL= 3kΩ, CL= 15pF

10% to 90%, RL= 3kΩ, CL= 15pF

-2V ≤ V

DADJ

≤ 2V

-2.3V ≤ V

DADJ

≤ 2.3V

I

SINK

= 3.2mA

-2.4V ≤ V

FADJ

≤ 2.4V

-2V ≤ V

FADJ

≤ 2V

I

SOURCE

= 400µA

-2V ≤ V

FADJ

≤ 2V

I

REF

= 0

Temperature Coefficient V

REF

/°C 20 ppm/°C

0mA ≤ I

REF

≤ 4mA (source) 1 2

Load Regulation V

REF/IREF

-100µA ≤ I

REF

≤ 0µA (sink) 1 4

mV/mA

Line Regulation V

REF

/V+ 4.75V ≤ V+ ≤ 5.25V (Note 2) 1 2 mV/V

Input Low Voltage V

IL

0.8 V

Input High Voltage V

IH

2.4 V

Input Current (A0, A1) IIL, I

IH

VA0, VA1= VIL, V

IH

±5 µA

Input Current (PDI) IIL, I

IH

V

PDI

= VIL, V

IH

±25 µA

Positive Supply Voltage V+ 4.75 5.25 V
SYNC Supply Voltage DV+ 4.75 5.25 V
Negative Supply Voltage V- -4.75 -5.25 V
Positive Supply Current I+ 35 45 mA
SYNC Supply Current I

DV+

1 2 mA

Negative Supply Current I- 45 55 mA

Maximum FADJ Modulating
Frequency

F

F

2 MHz

SYNC OUTPUT

DUTY-CYCLE ADJUSTMENT (DADJ)

FREQUENCY ADJUSTMENT (FADJ)

VOLTAGE REFERENCE

LOGIC INPUTS (A0, A1, PDI)

POWER SUPPLY

MAX038

High-Frequency Waveform Generator

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, V

DADJ

= V

FADJ

= V

PDI

= V

PDO

= 0V, RL= 1kΩ, CL= 20pF, TA = +25°C, unless

otherwise noted.)

0.1
1 100 1000

OUTPUT FREQUENCY

vs. IIN CURRENT

10

100

MAX038-08

IIN CURRENT (µA)

OUTPUT FREQUENCY (Hz)

10

1

1k

10k

100k

1M

10M

100M

100µF

47µF

10µF

3.3µF

1µF

100nF

33nF

3.3nF

330pF

100pF

33pF

1.0

0

-3 2

NORMALIZED OUTPUT FREQUENCY

vs. FADJ VOLTAGE

0.2

0.8

MAX038-09

V

FADJ

(V)

F

OUT

NORMALIZED

0

0.4

-2 -1 1

0.6

3

1.2

1.4

1.6

1.8

2.0
IIN = 100µA, COSC = 1000pF

0.85

NORMALIZED OUTPUT FREQUENCY

vs. DADJ VOLTAGE

0.90

1.10

MAX038-17

DADJ (V)

NORMALIZED OUTPUT FREQUENCY

1.00

0.95

1.05

IIN = 10µA

IIN = 25µA

IIN = 50µA

IIN = 100µA

IIN = 250µA

IIN = 500µA

2.0

-2.5

-2.0 -1.0 1.0 2.5

DUTY-CYCLE LINEARITY

vs. DADJ VOLTAGE

-2.0

1.0

MAX038-18

DADJ (V)

DUTY-CYCLE LINEARITY ERROR (%)

0 1.5

0

-1.0

-1.5

-0.5

0.5

1.5

IIN = 10µA

IIN = 25µA

IIN = 50µA

IIN = 100µA

IIN = 250µA

IIN = 500µA

60

0

-3 2

DUTY CYCLE vs. DADJ VOLTAGE

10

50

MAX038-16B

DADJ (V)

DUTY CYCLE (%)

0

30
20

-2 -1 1

40

70

80

90

100

3

IIN = 200µA

MAX038

High-Frequency Waveform Generator

_______________________________________________________________________________________

5

SINE-WAVE OUTPUT (50Hz)

TOP: OUTPUT 50Hz = F

o

BOTTOM: SYNC
I

IN

= 50µA

C

= 1µF

TRIANGLE-WAVE OUTPUT (50Hz)

TOP: OUTPUT 50Hz = F

o

BOTTOM: SYNC
I

IN

= 50µA

C

F

= 1µF

SQUARE-WAVE OUTPUT (50Hz)

TOP: OUTPUT 50Hz = F

o

BOTTOM: SYNC
I

IN

= 50µA

C

F

= 1µF

SINE-WAVE OUTPUT (20MHz)

IIN = 400µA
C

F

= 20pF

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 1, V+ = DV+ = 5V, V- = -5V, V

DADJ

= V

FADJ

= V

PDI

= V

PDO

= 0V, RL= 1kΩ, CL= 20pF, TA = +25°C, unless

otherwise noted.)

TRIANGLE-WAVE OUTPUT (20MHz)

IIN = 400µA
C

F

= 20pF