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MAX1227/MAX1229/MAX1231

12-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

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Detailed Description

The MAX1227/MAX1229/MAX1231 are low-power, seri-

al-output, multichannel ADCs with temperature-sensing

capability for temperature-control, process-control, and

monitoring applications. These 12-bit ADCs have inter-

nal track and hold (T/H) circuitry that supports single-

ended and fully differential inputs. Data is converted

from an internal temperature sensor or analog voltage

sources in a variety of channel and data-acquisition

configurations. Microprocessor (µP) control is made

easy through a 3-wire SPI/QSPI/MICROWIRE-compatible

serial interface.

Figure 2 shows a simplified functional diagram of the

MAX1227/MAX1229/MAX1231 internal architecture.

The MAX1227 has eight single-ended analog input

channels or four differential channels. The MAX1229

has 12 single-ended analog input channels or six differ-

ential channels. The MAX1231 has 16 single-ended

analog input channels or eight differential channels.

SCLK

DIN

DOUT

DOE

CSS

CSH

CSS

DOD

DOT

Figure 1. Detailed Serial-Interface Timing Diagram

12-BIT

SAR

ADC

CONTROL

SERIAL

INTERFACE

OSCILLATOR

FIFO AND

ACCUMULATOR

T/H

TEMP

SENSE

REF-

CNVST

SCLK

DIN

EOC

DOUT

AIN15

AIN1

AIN2

INTERNAL

REFERENCE

REF+

MAX1227

MAX1229

MAX1231

Figure 2. Functional Diagram

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 23 24

MAX1227/MAX1229/MAX1231 1

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