MAX522EPA Datasheet MAX522CSA+T, MAX522ESA+T, MAX522ESA | P1-P3

_______________General Description

The MAX522 contains two 8-bit, buffered, voltage-output

digital-to-analog converters (DAC A and DAC B) in small

8-pin SO and DIP packages. DAC A’s buffer can source

and sink 5mA, and DAC B’s output can source and sink

500µA, both to within 0.5V of ground and V

. The

MAX522 operates with a single +2.7V to +5.5V supply.

The device utilizes a 3-wire serial interface, which oper-

ates at clock rates up to 5MHz and is compatible with

SPI™, QSPI™, and Microwire™ interface standards.

The serial input shift register is 16 bits long and con-

sists of eight bits of DAC input data and eight bits for

DAC selection and shutdown control. DAC registers

can be loaded independently or in parallel at the posi-

tive edge of CS.

The MAX522’s ultra-low power consumption and small

8-pin SO package make it ideal for portable and bat-

tery-powered applications. Supply current is less than

1mA and drops below 1µA in shutdown mode. In addi-

tion, the reference input is disconnected from the REF

pin during shutdown, further reducing the system’s total

power consumption. The software format is compatible

with the MAX512/MAX513 triple 8-bit DACs.

________________________Applications

Digital Gain and Offset Adjustment

Programmable Current Source

Programmable Voltage Source

Power-Amp Bias Control

VCO Tuning

____________________________Features

♦ Operates from a Single +2.7V to +5.5V Supply

♦ Dual Buffered Voltage Output

♦ Low Power Consumption:

1mA Operating Current

<1µA Shutdown Current

♦ Independently Programmable Shutdown Mode

♦ 5MHz, 3-Wire Serial Interface

♦ SPI™, QSPI™, and Microwire™ Compatible

♦ Space-Saving 8-Pin SO Package

MAX522

Dual, 8-Bit, Voltage-Output

Serial DAC in 8-Pin SO Package

________________________________________________________________

Maxim Integrated Products

DAC

LATCH

DAC A

DAC

LATCH

DAC B

SCLK

OUTA

OUTB

DIN REF

16-BIT SHIFT REGISTER

CONTROL (8) DATA (8)

MAX522

0.1µF

0.1µF

(OPTIONAL)

0.01µF

OUTA

OUTB

GND4

0.22µF

________________Functional Diagram

OUTB

OUTA

GND

DIN

REF

SCLK

MAX522



TOP VIEW

DIP/SO

__________________Pin Configuration

Call toll free 1-800-998-8800 for free samples or literature.

19-0403; Rev 0; 6/95

PART TEMP. RANGE PIN-PACKAGE

MAX522CPA 0°C to +70°C 8 Plastic DIP

MAX522CSA 0°C to +70°C 8 SO

MAX522EPA -40°C to +85°C 8 Plastic DIP

SPI and QSPI are trademarks of Motorola Inc.

Microwire is a trademark of National Semiconductor Corp.

______________Ordering Information

MAX522ESA -40°C to +85°C 8 SO

MAX522

Dual, 8-Bit, Voltage-Output

Serial DAC in 8-Pin SO Package

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= +2.7V to +5.5V, REF = V

, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

= +25°C.)

Note 1: The outputs may be shorted to V

or GND if the package power dissipation is not exceeded. Typical short-circuit current to

GND is 50mA.

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.

to GND................................................................ -0.3V, +6V

Digital Inputs and Outputs to GND............... -0.3V, (V

+ 0.3V)

REF................................................................-0.3V, (V

+ 0.3V)

OUTA, OUTB (Note 1)............................................................V

Continuous Power Dissipation (T

= +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C) ..............727mW

SO (derate 5.88mW/°C above +70°C)...........................471mW

Operating Temperature Ranges

MAX522C_ A.......................................................0°C to +70°C

MAX522E_ A....................................................-40°C to +85°C

Storage Temperature Range.............................-65°C to +165°C

Lead Temperature (soldering, 10sec).............................+300°C

(Note 3)

2.7V ≤ V

≤ 3.6V, REF = 2.4V

4.5V ≤ V

≤ 5.5V, REF = 4.096V

CONDITIONS

MΩ2

Reference Input Resistance

(shutdown mode)

kΩ

REF

Reference Input Resistance 8

pF25Reference Input Capacitance

GND V

%/%

0.01

PSRRPower-Supply Rejection Ratio

Bits8NResolution

µV/°C100

Zero-Code Temperature

Coefficient

UNITSMIN TYP MAXSYMBOLPARAMETER

Guaranteed monotonic LSB±1DNLDifferential Nonlinearity

0.015

(Note 2) LSB±1.5INLIntegral Nonlinearity

(Note 2) LSB±1TUETotal Unadjusted Error

Reference Input Voltage Range V

DAC A

µF

0.1

Capacitive Load at OUT_

DAC A

Ω

Output Resistance

V0 REFOutput Voltage Range

V(0.7)(V

)

Input High Voltage

V(0.3)(V

)

Input Low Voltage

= 0V or V

µA0.1 ±10

Input Current

(Notes 4, 5) pF10

Input Capacitance

DAC B

0.01

500

STATIC PERFORMANCE

REFERENCE INPUTS

DAC OUTPUTS

DIGITAL INPUTS

MAX522

Dual, 8-Bit, Voltage-Output

Serial DAC in 8-Pin SO Package

_______________________________________________________________________________________ 3

Note 2: Reduced digital code range (code 24 through code 232) is due to swing limitations of the output amplifiers. See

Typical

Operating Characteristics

Note 3: Reference input resistance is code dependent. The lowest input resistance occurs at code 55hex. Refer to the

Reference

Input

section in the

Detailed Description

Note 4: Guaranteed by design. Not production tested.

Note 5: Input capacitance is code dependent. The highest capacitance occurs at code 00hex.

CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER

ELECTRICAL CHARACTERISTICS (continued)

= +2.7V to +5.5V, REF = V

, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

= +25°C.)

Voltage-Output Slew Rate SR C

= 0.1µF (DAC A), C

= 0.01µF (DAC B) 0.1 V/µs

Voltage-Output Settling Time To ±

⁄

LSB µs

Digital Feedthrough

and Crosstalk

All 0s to all 1s 10 nV-s

Supply Voltage Range V

2.7 5.5 V

Shutdown Supply Current V

= 5.5V 0.1 µA

= 0.1µF (DAC A)

= 0.01µF (DAC B) 70

Supply Current I

All inputs = 0V

1.3 2.8

0.9 2.5

DYNAMIC PERFORMANCE

POWER SUPPLIES

= 5.5V

= 3.6V

TIMING CHARACTERISTICS (Note 4)

= +2.7V to +5.5V, T

= T

MIN

to T

MAX

, unless otherwise noted.)

CONDITIONS

ns200t

CSPWH

–

—

–

Pulse Width High

ns100t

SCLK Pulse Width Low

ns100t

SCLK Pulse Width High

ns50t

DIN to SCLK Rise Hold Time

ns50t

DIN to SCLK Rise Setup Time

UNITSMIN TYP MAXSYMBOLPARAMETER

ns150t

CSS

–

—

–

Fall to SCLK Rise Setup Time

ns150t

CSH

SCLK Rise to

–

—

–

Rise Setup Time

SERIAL INTERFACE TIMING

P1-P3 P4-P6 P7-P9 P10-P12

MAX522EPA

Mfr. #:

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Manufacturer:

Maxim Integrated

Description:

Digital to Analog Converters - DAC 8-Bit 2Ch Precision DAC

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MAX522EPA

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