General Description

The MAX1144/MAX1145 are 150ksps, 14-bit ADCs.

These serially interfaced ADCs connect directly to

SPI™, QSPI™, and MICROWIRE™ devices without

external logic. They combine an input scaling network,

internal track/hold, clock, and three general-purpose

digital output pins (for external multiplexer or PGA con-

trol) in a 20-pin SSOP package. The excellent dynamic

performance (THD

≥ 90dB), high speed (150ksps in

bipolar mode), and low power (8.0mA) of these ADCs

make them ideal for applications such as industrial

process control, instrumentation, and medical applica-

tions.

The MAX1144 accepts input signals of 0 to +6V (unipo-

lar) or ±6V (bipolar), while the MAX1145 accepts input

signals of 0 to +2.048V (unipolar) or ±2.048V (bipolar).

Operating from a single 3.135V to 3.465V analog digital

supply, powerdown modes reduce current consump-

tion to 0.15mA at 10ksps and further reduce supply

current to less than 20µA slower data rates.

A serial strobe output (SSTRB) allows direct connection

to the TMS320 family digital-signal processors. The

MAX1144/MAX1145 user can select either the internal

clock or an external serial-interface clock for the ADC to

perform analog-to-digital conversions.

The MAX1144/MAX1145 feature internal calibration cir-

cuitry to correct linearity and offset errors. On-demand

calibration allows the user to optimize performance.

Three user-programmable logic outputs are provided

for the control of an 8-channel mux or PGA.

The MAX1144/MAX1145 are available in a 20-pin SSOP

package and are fully specified over the -40°C to

+85°C temperature range.

Applications

Industrial Process Control

Industrial I/O Modules

Data-Acquisition Systems

Medical Instruments

Portable and Battery-Powered Equipment

Features

o 150ksps (Bipolar) and 125ksps (Unipolar)

Sampling ADC

o 14 Bits, No Missing Codes

o 1LSB INL Guaranteed

o -100dB THD

o 3.3V Single-Supply Operation

o Low-Power Operation

5mA typ (Unipolar Mode)

o 1.2µA Shutdown Mode

o Software-Configurable Unipolar and Bipolar Input

Ranges

0 to +6V and ±6V (MAX1144)

0 to +2.048V and ±2.048V (MAX1145)

o Internal or External Clock

o SPI/QSPI/MICROWIRE TMS320-Compatible Serial

Interface

o Three User-Programmable Logic Outputs

o Small 20-Pin SSOP Package

14-Bit ADCs, 150ksps, 3.3V Single Supply

________________________________________________________________ Maxim Integrated Products

1

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

AIN

AGND

CREF

CS

AGND

REF

TOP VIEW

DIN

DGND

SCLK

P1

P2

SHDN

DGND

12

11

9

10

RST

DOUT

SSTRB

PO

MAX1144

MAX1145

SSOP

Pin Configuration

Ordering Information

19-2465; Rev 0; 4/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information continued at end of data sheet.

Functional Diagram and Typical Application Circuit appear

at end of data sheet.

PART

TEMP

RANGE

PIN-

PACKAGE

INL

(LSB)

MAX1144ACAP

0

°C to +70°C

20 SSOP

±1

MAX1144BCAP

0

°C to +70°C

20 SSOP

±2

MAX1144AEAP

-40

°C to +85°C

20 SSOP

±1

MAX1144BEAP

-40

°C to +85°C

20 SSOP

±2

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor, Corp.