MAX146ACAP(2001) Просмотр технического описания (PDF) - Maxim Integrated

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MAX146ACAP
(Rev.:2001)

+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs

Maxim Integrated 

19-0465; Rev 2; 10/01

EVAALVUAAILTAIOBNLEKIT

+2.7V, Low-Power, 8-Channel,

Serial 12-Bit ADCs

General Description

The MAX146/MAX147 12-bit data-acquisition systems

combine an 8-channel multiplexer, high-bandwidth

track/hold, and serial interface with high conversion

speed and low power consumption. The MAX146 oper-

ates from a single +2.7V to +3.6V supply; the MAX147

operates from a single +2.7V to +5.25V supply. Both

devices’ analog inputs are software configurable for

unipolar/bipolar and single-ended/differential operation.

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

QSPI™ and MICROWIRE™ devices without external

logic. A serial strobe output allows direct connection to

TMS320-family digital signal processors. The

MAX146/MAX147 use either the internal clock or an exter-

nal serial-interface clock to perform successive-approxi-

mation analog-to-digital conversions.

The MAX146 has an internal 2.5V reference, while the

MAX147 requires an external reference. Both parts have

a reference-buffer amplifier with a ±1.5% voltage-

adjustment range.

These devices provide a hard-wired SHDN pin and a

software-selectable power-down, and can be pro-

grammed to automatically shut down at the end of a con-

version. Accessing the serial interface automatically

powers up the MAX146/MAX147, and the quick turn-on

time allows them to be shut down between all conver-

sions. This technique can cut supply current to under

60µA at reduced sampling rates.

The MAX146/MAX147 are available in 20-pin DIP and

SSOP packages.

For 4-channel versions of these devices, see the

MAX1246/MAX1247 data sheet.

________________________Applications

____________________________Features

o 8-Channel Single-Ended or 4-Channel

Differential Inputs

o Single-Supply Operation

+2.7V to +3.6V (MAX146)

+2.7V to +5.25V (MAX147)

o Internal 2.5V Reference (MAX146)

o Low Power

1.2mA (133ksps, 3V supply)

54µA (1ksps, 3V supply)

1µA (power-down mode)

o SPI/QSPI/MICROWIRE/TMS320-Compatible

4-Wire Serial Interface

o Software-Configurable Unipolar or Bipolar Inputs

o 20-Pin DIP/SSOP Packages

Ordering Information

PART

MAX146ACPP

MAX146BCPP

MAX146ACAP

MAX146BCAP

MAX146BC/D

TEMP RANGE

0°C to +70°C

0°C to +70°C

0°C to +70°C

0°C to +70°C

0°C to +70°C

PIN-PACKAGE

20 Plastic DIP

20 Plastic DIP

20 SSOP

20 SSOP

Dice*

INL

(LSB)

±1/2

±1

±1/2

±1

±1

Ordering Information continued at end of data sheet.

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

Typical Operating Circuit

Portable Data Logging Data Acquisition

Medical Instruments Battery-Powered Instruments

Pen Digitizers

Process Control

Pin Configuration appears at end of data sheet.

SPI and QSPI are registered trademarks of Motorola, Inc.

MICROWIRE is a registered trademark of National Semiconductor

Corp.

0V TO

+2.5V

ANALOG

INPUTS

4.7µF

0.047µF

CH0

VDD

DGND

MAX146 AGND

CH7

VREF

REFADJ

COM

CS

SCLK

DIN

DOUT

SSTRB

SHDN

+3V

VDD

0.1µF

CPU

I/O

SCK (SK)

MOSI (SO)

MISO (SI)

VSS

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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