General Description

The MAX1224/MAX1225 low-power, high-speed, serial-

output, 12-bit, analog-to-digital converters (ADCs) oper-

ate at up to 1.5Msps. These devices feature true-differen-

tial inputs, offering better noise immunity, distortion

improvements, and a wider dynamic range over single-

ended inputs. A standard SPI™/QSPI™/MICROWIRE™

interface provides the clock necessary for conversion.

These devices easily interface with standard digital signal

processor (DSP) synchronous serial interfaces.

The MAX1224/MAX1225 operate from a single +2.7V to

+3.6V supply voltage and require an external reference.

The MAX1224 has a unipolar analog input, while the

MAX1225 has a bipolar analog input. These devices fea-

ture a partial power-down mode and a full power-down

mode for use between conversions, which lower the sup-

ply current to 1mA (typ) and 1µA (max), respectively. Also

fast conversion speed, low-power dissipation, good AC

performance, and DC accuracy (±1.5 LSB INL) make the

MAX1224/MAX1225 ideal for industrial process control,

motor control, and base-station applications.

The MAX1224/MAX1225 come in a 12-pin TQFN pack-

age, and are available in the extended (-40°C to +85°C)

temperature range.

Applications

Data Acquisition

Communications

Bill Validation

Portable Instruments

Motor Control

Features

o 1.5Msps Sampling Rate

o Only 18mW (typ) Power Dissipation

o Only 1µA (max) Shutdown Current

o High-Speed, SPI-Compatible, 3-Wire Serial Interface

o 69dB S/(N + D) at 525kHz Input Frequency

o Internal True-Differential Track/Hold (T/H)

o External Reference

o No Pipeline Delays

o Small 12-Pin TQFN Package

1.5Msps, Single-Supply, Low-Power,

True-Differential, 12-Bit ADCs

________________________________________________________________

Maxim Integrated Products

1

12

AIN+

11

N.C.

10

SCLK

45

N.C.

6

GND

1

2

REF

3

9

8

7

RGND

CNVST

DOUT

MAX1224

MAX1225

AIN-

TQFN

TOP VIEW

PART

TEMP RANGE

PIN-

PACKAGE

INPUT

MAX1224ETC+T

-40

°C to +85°C 12 TQFN

Unipolar

MAX1225ETC+T

-40

°C to +85°C 12 TQFN

Bipolar

Pin Configuration

Ordering Information

MAX1224

MAX1225

DOUT

AIN+

REF

4.7

μF

10

μF

10

μF

+2.7V TO +3.6V

0.01

μF

0.01

μF

0.01

μF

AIN-

REF

DIFFERENTIAL

INPUT

VOLTAGE

RGND

GND

CNVST

SCLK

μC/DSP

+

-

Typical Operating Circuit

19-3271; Rev 1; 4/09

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.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

+

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

T = Tape and reel.