Datasheet > MAX149BMAP/PR3

MAX149BMAP/PR3

更新时间： 2024-09-13 08:40:55

品牌	Logo	应用领域
美信 - MAXIM		光电二极管
页数	文件大小	规格书
23页	1916K
描述
ADC, Successive Approximation, 10-Bit, 1 Func, 8 Channel, Serial Access, CMOS, PDSO20, SSOP-20

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数据手册

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MAX149BMAP/PR3 数据手册

19-0464; Rev 4; 1/10

+2.7V to +5.25V, Low-Power, 8-Channel,

Serial 10-Bit ADCs

General Description

Features

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

The MAX148/MAX149 10-bit data-acquisition systems

combine an 8-channel multiplexer, high-bandwidth

track/hold, and serial interface with high conversion

speed and low power consumption. They operate from a

single +2.7V to +5.25V supply, and sample to 133ksps.

Both devices’ analog inputs are software configurable for

unipolar/bipolar and single-ended/differential operation.

Inputs

S Single-Supply Operation: +2.7V to +5.25V

S Internal 2.5V Reference (MAX149)

S Low Power: 1.2mA (133ksps, 3V Supply)

54µA (1ksps, 3V Supply)

The 4-wire serial interface connects directly to SPIK/

QSPIK and MICROWIREK devices without external

logic. A serial-strobe output allows direct connection to

TMS320-family digital signal processors. The MAX148/

MAX149 use either the internal clock or an external seri-

al-interface clock to perform successive-approximation

analog-to-digital conversions.

1µA (Power-Down Mode)

S SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire

Serial Interface

S Software-Configurable Unipolar or Bipolar Inputs

S 20-Pin DIP/SSOP Packages

The MAX149 has an internal 2.5V reference, while the

MAX148 requires an external reference. Both parts

have a reference-buffer amplifier with a Q1.5% voltage-

adjustment range.

Ordering Information

PIN-

INL

PART†

TEMP RANGE

PACKAGE (LSB)

MAX148ACPP

MAX148BCPP

MAX148ACAP

MAX148BCAP

0°C to +70°C

20PlasticDIP

20 SSOP

1/2

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

conversion. Accessing the serial interface automatically

powers up the MAX148/MAX149, and the quick turn-on

time allows them to be shut down between all conver-

sions. This technique can cut supply current to under

60FA at reduced sampling rates.

1/2

20 SSOP

Ordering Information continued at end of data sheet.

†

Contact factory for availability of alternate surface-mount

package. Specify lead-free by placing + by the part number

when ordering.

The MAX148/MAX149 are available in a 20-pin DIP and

a 20-pin SSOP.

*Contact factory for availability of CERDIP package, and for

processing to MIL-STD-883B. Not available in lead-free.

For 4-channel versions of these devices, see the

MAX1248/MAX1249 data sheet.

Typical Operating Circuit

+3V

Applications

Portable Data Logging

Data Acquisition

CH0

0.1FF

O TO

+2.5V

ANALOG

INPUTS

DGND

MAX149

Medical Instruments

AGND

COM

CH7

Battery-Powered Instruments

Pen Digitizers

CPU

VREF

4.7FF

SCLK

DIN

I/O

Process Control

SCK (SK)

MOSI (SO)

MISO (SI)

READJ

DOUT

0.01FF

SSTRB

SHDN

Pin Configuration appears at end of data sheet.

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

_______________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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