_______________General Description

The MAX186/MAX188 are 12-bit data-acquisition sys-

tems that combine an 8-channel multiplexer, high-band-

width track/hold, and serial interface together with high

conversion speed and ultra-low power consumption.

The devices operate with a single +5V supply or dual

±5V supplies. The analog inputs are software config-

urable for unipolar/bipolar and single-ended/differential

operation.

The 4-wire serial interface directly connects to SPI™,

QSPI™ and Microwire™ devices without external logic. A

serial strobe output allows direct connection to TMS320

family digital signal processors. The MAX186/MAX188

use either the internal clock or an external serial-interface

clock to perform successive-approximation A/D conver-

sions. The serial interface can operate beyond 4MHz

when the internal clock is used.

The MAX186 has an internal 4.096V reference while the

MAX188 requires an external reference. Both parts

have a reference-buffer amplifier that simplifies gain

trim .

The MAX186/MAX188 provide a hard-wired

SHDN pin

and two software-selectable power-down modes.

Accessing the serial interface automatically powers up

the devices, and the quick turn-on time allows the

MAX186/MAX188 to be shut down between every

conversion. Using this technique of powering down

between conversions, supply current can be cut to

under 10µA at reduced sampling rates.

The MAX186/MAX188 are available in 20-pin DIP and

SO packages, and in a shrink small-outline package

(SSOP), that occupies 30% less area than an 8-pin DIP.

For applications that call for a parallel interface, see the

MAX180/MAX181 data sheet. For anti-aliasing filters,

consult the MAX274/MAX275 data sheet.

________________________Applications

Portable Data Logging

Data-Acquisition

High-Accuracy Process Control

Automatic Testing

Robotics

Battery-Powered Instruments

Medical Instruments

____________________________Features

o 8-Channel Single-Ended or 4-Channel

Differential Inputs

o Single +5V or ±5V Operation

o Low Power: 1.5mA (operating mode)

2µA (power-down mode)

o Internal Track/Hold, 133kHz Sampling Rate

o Internal 4.096V Reference (MAX186)

o SPI-, QSPI-, Microwire-, TMS320-Compatible

4-Wire Serial Interface

o Software-Configurable Unipolar or Bipolar Inputs

o 20-Pin DIP, SO, SSOP Packages

o Evaluation Kit Available

______________Ordering Information

Ordering Information continued on last page.

† NOTE: Parts are offered in grades A, B, C and D (grades defined

in Electrical Characteristics). When ordering, please specify grade.

Contact factory for availability of A-grade in SSOP package.

*

Dice are specified at +25°C, DC parameters only.

* * Contact factory for availability and processing to MIL-STD-883.

TEMP. RANGE

Low-Power, 8-Channel,

Serial 12-Bit ADCs

________________________________________________________________ Maxim Integrated Products

1

PIN-PACKAGE

MAX186_CPP

20 Plastic DIP

MAX186_CWP

20 SO

20 SSOP

MAX186DC/D

Dice*

MAX186_EPP

20 Plastic DIP

MAX186_CAP

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

TOP VIEW

DIP/SO/SSOP

SCLK

CS

DIN

SSTRB

DOUT

DGND

AGND

REFADJ

VREF

SHDN

CH7

CH6

CH5

CH4

CH3

CH2

CH1

CH0

MAX186

MAX188

____________________Pin Configuration

0°C to +70°C

0°C to +70°C

0°C to +70°C

0°C to +70°C

MAX186_EWP

20 SO

MAX186_EAP

-40°C to +85°C

20 SSOP

MAX186_MJP

-55°C to +125°C

20 CERDIP**

SPI and QSPI are registered trademarks of Motorola.

Microwire is a registered trademark of National Semiconductor.

-40°C to +85°C

-40°C to +85°C

19-0123; Rev. 4; 8/96

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

EVALUATION

KIT

AVAILABLE