MAX1245 Maxim, MAX1245 Datasheet

MAX1245

Manufacturer Part Number

MAX1245

Description

+2.375V / Low-Power / 8-Channel / Serial 12-Bit ADC

Manufacturer

Maxim

Datasheet

1.MAX1245.pdf (20 pages)

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The MAX1245 12-bit data-acquisition system combines

an 8-channel multiplexer, high-bandwidth track/hold, and

serial interface with high conversion speed and ultra-low

power consumption. It operates from a single +2.375V to

+3.3V supply, and its 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 MAX1245

works with an external reference, and uses either the

internal clock or an external serial-interface clock to

perform successive-approximation analog-to-digital

conversions.

This device provides 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

conversion. Accessing the serial interface powers up

the MAX1245, and the quick turn-on time allows it to be

shut down between conversions. This technique can

cut supply current to under 10µA at reduced sampling

rates.

The MAX1245 is available in a 20-pin DIP package and

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

For supply voltages from +2.7V to +5.25V, use the pin-

compatible MAX147.

________________________Applications

___________Typical Operating Circuit

19-1066; Rev 0; 6/96

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

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

________________General Description

+2.048V

Portable Data Logging

Battery-Powered Instruments

ANALOG

+2.048V

INPUTS

0V to

0.1 F

CH7

CH0

VREF

MAX1245

________________________________________________________________ Maxim Integrated Products

SSTRB

DGND

AGND

SCLK

DOUT

SHDN

COM

DIN

+2.5V

0.1 F

Medical Instruments

Data Acquisition

+2.375V, Low-Power, 8-Channel,

SCK (SK)*

MOSI (SO)

MISO (SI)

I/O

CPU

____________________________Features

________________Ordering Information

Ordering Information continued at end of data sheet.

†

* Contact factory for availability.

___________________Pin Configuration

Contact factory for availability of alternate surface-mount

packages.

MAX1245ACPP

MAX1245BCPP

MAX1245ACAP

MAX1245BCAP

MAX1245BC/D

Single +2.375V to +3.3V Operation

8-Channel Single-Ended or 4-Channel

Differential Analog Inputs

Low Power: 0.8mA (100ksps)

Internal Track/Hold, 100kHz Sampling Rate

SPI/QSPI/Microwire/TMS320-Compatible

4-Wire Serial Interface

Software-Configurable Unipolar or Bipolar Inputs

20-Pin DIP/SSOP Packages

TOP VIEW

PART

†

SHDN

Serial 12-Bit ADC

COM

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

10µA (1ksps)

1µA (power-down mode)

TEMP. RANGE

0°C to +70°C

DIP/SSOP

MAX1245

20 Plastic DIP

20 SSOP

Dice*

PIN-PACKAGE

SCLK

DIN

SSTRB

DOUT

DGND

AGND

VREF

(LSB)

±1/2

±1

±1/2

±1

INL

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