MAX155AEWI(2012) データシートの表示（PDF） - Maxim Integrated

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MAX155AEWI
(Rev.:2012)

8-/4-Channel ADCs with Simultaneous T/Hs and Reference

Maxim Integrated 

MAX155/MAX156

EVALUATION KIT AVAILABLE

8-/4-Channel ADCs with Simultaneous

T/Hs and Reference

General Description

The MAX155/MAX156 are high-speed, 8-bit, multichan-

nel analog-to-digital converters (ADCs) with simultaneous

track/holds (T/Hs) to eliminate timing differences between

input channel samples. The MAX155 has 8 analog input

channels and the MAX156 has 4 analog input channels.

Each channel has its own T/H, and all T/Hs sample at the

same instant. The ADC converts a channel in 3.6µs and

stores the result in an internal 8x8 RAM. The MAX155/

MAX156 also feature a 2.5V internal reference and

power-down capability, providing a complete, sampling

data-acquisition system.

When operating from a single +5V supply, the MAX155/

MAX156 perform either unipolar or bipolar, single-ended

or differential conversions. For applications requiring

wider dynamic range or bipolar conversions around

ground, the VSS supply pin may be connected to -5V.

Conversions are initiated with a pulse to the WR pin, and data

is accessed from the ADC’s RAM with a pulse to the RD pin.

A bidirectional interface updates the channel configuration

and provides output data. The ADC may also be wired for

output-only operation.The MAX155 comes in 28-pin PDIP

and wide SO packages, and the MAX156 comes in 24-pin

narrow PDIP and 28-pin wide SO packages.

Functional Diagram

Features

●● 8 Simultaneously Sampling Track/Hold Inputs

●● 3.6µs Conversion Time Per Channel

●● Unipolar or Bipolar Input Range

●● Single-Ended or Differential Inputs

●● Mixed Input Configurations Possible

●● 2.5V Internal Reference

●● Single +5V or Dual ±5V Supply Operation

Applications

●● Phase-Sensitive Data Acquisition

●● Vibration and Waveform Analysis

●● DSP Analog Input

●● AC Power Meters

●● Portable Data Loggers

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to www.maximintegrated.com/MAX155.related.

AIN0 T/H

AIN1 T/H

AIN2 T/H

AIN3 T/H

AIN4 T/H

AIN5 T/H

AIN6 T/H

AIN7 T/H

MAX155

8-BIT

A/D

3.6µs

8

8x8 8

RAM

2.5V

VREF

THREE- 8

STATE

BUFFER

CLK

REFIN

REFOUT

8-BIT

DATA

8 BUS

8

CONTROL

LOGIC

CS

RD

WR

MODE

19-2949; Rev 2; 1/12

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