Low-Cost, 2-Channel, ±14-Bit Serial ADCs

________________________________________________________________

Maxim Integrated Products

1

General Description

The MAX110/MAX111 analog-to-digital converters

(ADCs) use an internal auto-calibration technique to

achieve 14-bit resolution plus overrange, with no exter-

nal components. Operating supply current is only

550µA (MAX110) and reduces to 4µA in power-down

mode, making these ADCs ideal for high-resolution bat-

tery-powered or remote-sensing applications. A fast

serial interface simplifies signal routing and opto-isola-

tion, saves microcontroller pins, and offers compatibility

with SPI™, QSPI™, and MICROWIRE™. The MAX110

operates with ±5V supplies, and converts differential

analog signals in the -3V to +3V range. The MAX111

operates with a single +5V supply and converts differ-

ential analog signals in the ±1.5V range, or single-

ended signals in the 0V to +1.5V range.

Internal calibration allows for both offset and gain-error

correction under microprocessor (µP) control. Both

devices are available in space-saving 16-pin DIP and

SO packages, as well as an even smaller 20-pin SSOP

package.

________________________Applications

Process Control

Weigh Scales

Panel Meters

Data-Acquisition Systems

Temperature Measurement

____________________________Features

o Single +5V Supply (MAX111)

o Two Differential Input Channels

o 14-Bit Resolution Plus Sign and Overrange

o 0.03% Linearity (MAX110)

0.05% Linearity (MAX111)

o Low Power Consumption:

550µA (MAX110)

640µA (MAX111)

4µA Shutdown Current

o Up to 50 Conversions/sec

o 50Hz/60Hz Rejection

o Auto-Calibration Mode

o No External Components Required

o 16-Pin DIP/SO, 20-Pin SSOP

Ordering Information

19-0283; Rev 5; 11/98

Typical Operating Circuit

Pin Configurations

IN1+

IN1-

REF+

REF-

CS

RCSEL

SCLK

DIN

DOUT

IN2+

IN2-

+5V

-5V (0V)

FROM

µC

MAX110

MAX111

( ) ARE FOR MAX111

(AGND)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

IN1+

REF-

REF+

RCSEL

XCLK

SCLK

BUSY

IN1-

IN2+

IN2-

GND

DIN

DOUT

CS

TOP VIEW

MAX110

MAX111

DIP/SO

( ) ARE FOR MAX111

PART

MAX110ACPE

MAX110BCPE

MAX110ACWE

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 Plastic DIP

16 Plastic DIP

16 Wide SO

MAX110BCWE

0°C to +70°C

16 Wide SO

MAX110ACAP

0°C to +70°C

20 SSOP

MAX110BCAP

0°C to +70°C

20 SSOP

EVALUATION

KIT

AVAILABLE

MAX110BC/D

0°C to +70°C

Dice*

Ordering Information continued at end of data sheet.

*

Contact factory for dice specifications.

SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations continued at end of data sheet.

INL(%)

±0.03

±0.05

±0.03

±0.05

±0.03

±0.05

±0.05

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.