MAX127ACAI(2012) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX127ACAI
(Rev.:2012)

Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

Maxim Integrated 

MAX127/MAX128

EVALUATION KIT AVAILABLE

Multirange, +5V, 12-Bit DAS with

2-Wire Serial Interface

General Description

The MAX127/MAX128 are multirange, 12-bit data acquisi-

tion systems (DAS) that require only a single +5V supply

for operation, yet accept signals at their analog inputs

that may span above the power-supply rail and below

ground. These systems provide eight analog input chan-

nels that are independently software programmable for

a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for

the MAX127; and ±VREF, ±VREF/2, 0 to +VREF, 0 to

+VREF/2 for the MAX128. This range switching increases

the effective dynamic range to 14 bits and provides the

flexibility to interface 4–20mA, ±12V, and ±15V-powered

sensors directly to a single +5V system. In addition, these

converters are fault protected to ±16.5V; a fault condition

on any channel will not affect the conversion result of the

selected channel. Other features include a 5MHz band-

width track/hold, an 8ksps throughput rate, and the option

of an internal 4.096V or external reference.

The MAX127/MAX128 feature a 2-wire, I2C-compatible

serial interface that allows communication among multiple

devices using SDA and SCL lines.

A hardware shutdown input (SHDN) and two softwarepro-

grammable power-down modes (standby and full power-

down) are provided for low-current shutdown between

conversions. In standby mode, the reference buffer

remains active, eliminating startup delays.

The MAX127/MAX128 are available in 24-pin narrow

PDIP or space-saving 28-pin SSOP packages.

Applications

●● Industrial Control Systems

●● Data-Acquisition Systems

●● Robotics

●● Automatic Testing

●● Battery-Powered Instruments

●● Medical Instruments

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX127ACNG+ 0°C to +70°C 24 Narrow PDIP

MAX127ACNG+ 0°C to +70°C 24 Narrow PDIP

+Denotes a lead(Pb)-free/RoHS-compliant package.

INL

(LSB)

±1/2

±1

Ordering Information continued at end of data sheet.

Features

●● 12-Bit Resolution, 1/2 LSB Linearity

●● +5V Single-Supply Operation

●● I2C-Compatible, 2-Wire Serial Interface

●● Four Software-Selectable Input Ranges

• MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V

• MAX128: 0 to +VREF, 0 to +VREF/2, ±VREF,

±VREF/2

●● 8 Analog Input Channels

●● 8ksps Sampling Rate

●● ±16.5V Overvoltage-Tolerant Input Multiplexer

●● Internal 4.096V or External Reference

●● Two Power-Down Modes

●● 24-Pin Narrow PDIP or 28-Pin SSOP Packages

Typical Operating Circuit

+5V

0.1µF

ANALOG

INPUTS

4.7µF

VDD

SHDN

CH0

CH1

CH2

CH3 MAX127

CH4

CH5

MAX128

CH6

CH7

SCL

SDA

A0

REF

A1

REFADJ

A2

0.01µF

DGND AGND

µC

SCL SDA

1kΩ

Pin Configurations appear at end of data sheet.

19-4773; Rev 1; 12/12

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