General Description

The MAX1110/MAX1111 are low-power, 8-bit, 8-chan-

nel analog-to-digital converters (ADCs) that feature an

internal track/hold, voltage reference, clock, and serial

interface. They operate from a single +2.7V to +5.5V

supply and consume only 85µA while sampling at rates

up to 50ksps. The MAX1110’s 8 analog inputs and the

MAX1111’s 4 analog inputs are software-configurable,

allowing unipolar/bipolar and single-ended/differential

operation.

Successive-approximation conversions are performed

using either the internal clock or an external serial-inter-

face clock. The full-scale analog input range is deter-

mined by the 2.048V internal reference, or by an

The 4-wire serial interface is compatible with the SPI™,

QSPI™, and MICROWIRE™ serial-interface standards.

A serial-strobe output provides the end-of-conversion

signal for interrupt-driven processors.

The MAX1110/MAX1111 have a software-program-

mable, 2µA automatic power-down mode to minimize

power consumption. Using power-down, the supply

current is reduced to 6µA at 1ksps, and only 52µA at

10ksps. Power-down can also be controlled using the

SHDN input pin. Accessing the serial interface automat-

ically powers up the device.

The MAX1110 is available in 20-pin SSOP and DIP

packages. The MAX1111 is available in small 16-pin

QSOP and DIP packages.

________________________Applications

Portable Data Logging

Hand-Held Measurement Devices

Medical Instruments

System Diagnostics

Solar-Powered Remote Systems

4–20mA-Powered Remote

Data-Acquisition Systems

____________________________Features

o +2.7V to +5.5V Single Supply

o Low Power: 85µA at 50ksps

6µA at 1ksps

o 8-Channel Single-Ended or 4-Channel Differential

Inputs (MAX1110)

o 4-Channel Single-Ended or 2-Channel Differential

Inputs (MAX1111)

o Internal Track/Hold; 50kHz Sampling Rate

o Internal 2.048V Reference

o SPI/QSPI/MICROWIRE-Compatible Serial Interface

o Software-Configurable Unipolar or Bipolar Inputs

o Total Unadjusted Error: ±1LSB max

±0.3LSB typ

+2.7V, Low-Power, Multichannel,

Serial 8-Bit ADCs

________________________________________________________________

Maxim Integrated Products

1

INPUT

SHIFT

REGISTER

CONTROL

LOGIC

INT

CLOCK

OUTPUT

SHIFT

REGISTER

+2.048V

REFERENCE

T/H

ANALOG

INPUT

MUX

8-BIT

SAR ADC

IN

DOUT

SSTRB

DGND

AGND

SCLK

DIN

CH0

CH1

CH3

CH2

CH7*

CH6*

CH5*

CH4*

COM

REFOUT

*MAX1110 ONLY

REFIN

OUT

REF

CLOCK

MAX1110

MAX1111

CS

SHDN

________________Functional Diagram

19-1194; Rev 2; 10/98

PART

MAX1110CPP

MAX1110CAP

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

20 Plastic DIP

20 SSOP

EVALUATION

KIT

AVAILABLE

Ordering Information

Ordering Information continued at end of data sheet.

*

Pin Configurations appear at end of data sheet.

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.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

MAX1110C/D

0°C to +70°C

Dice*