MAX1494 datasheet(1/35 Pages) MAXIM

Part #	MAX1494

Description	3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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General Description

The MAX1492/MAX1494 low-power, 3.5- and 4.5-digit,

analog-to-digital converters (ADCs) with integrated liquid

crystal display (LCD) drivers operate from a single 2.7V

to 5.25V power supply. They include an internal refer-

ence, a high-accuracy on-chip oscillator, and a triplexed

LCD driver. An internal charge pump generates the neg-

ative supply needed to power the integrated input buffer

for single-supply operation. The ADC is configurable for

either a ±2V or ±200mV input range and outputs its con-

version results to an LCD and/or to a microcontroller

(µC). µC communication is facilitated through an

SPI™-/QSPI™-/MICROWIRE™-compatible serial inter-

face. The MAX1492 is a 3.5-digit (±1999 count) device,

and the MAX1494 is a 4.5-digit (±19,999 count) device.

The MAX1492/MAX1494 do not require external-preci-

sion integrating capacitors, autozero capacitors, crystal

oscillators, charge pumps, or other circuitry required

with dual-slope ADCs (commonly used in panel meter

circuits).

These devices also feature on-chip buffers for the dif-

ferential signal and reference inputs, allowing direct

interface with high-impedance signal sources. In addi-

tion, they use continuous internal-offset calibration and

offer >100dB simultaneous rejection of 50Hz and 60Hz

line noise. Other features include data hold and peak

hold, overrange and underrange detection, and a low-

battery monitor.

The MAX1494 comes in a 32-pin, 7mm x 7mm TQFP

package, and the MAX1492 comes in 28-pin SSOP and

28-pin PDIP packages. All devices in this family operate

over the 0°C to +70°C commercial temperature range.

Applications

Digital Panel Meters

Hand-Held Meters

Digital Voltmeters

Digital Multimeters

Features

o High Resolution

MAX1494: 4.5 Digits (±19,999 Count)

MAX1492: 3.5 Digits (±1999 Count)

o Sigma-Delta ADC Architecture

No Integrating Capacitors Required

No Autozeroing Capacitors Required

>100dB of Simultaneous 50Hz and 60Hz

Rejection

o Operate from a Single 2.7V or 5.25V Supply

o Selectable Input Range of ±200mV or ±2V

o Selectable Voltage Reference: Internal 2.048V

or External

o Internal High-Accuracy Oscillator Needs No

External Components

o Automatic Offset Calibration

o Low Power

Maximum 960µA Operating Current

Maximum 400µA Shutdown Current

o Small 32-Pin 7mm x 7mm TQFP Package

(4.5 Digits), 28-Pin SSOP Package (3.5 Digits)

o Triplexed LCD Driver

o SPI-/QSPI-/MICROWIRE-Compatible Serial

Interface

o Evaluation Kit Available (Order MAX1494EVKIT)

3.5- and 4.5-Digit, Single-Chip ADCs

with LCD Drivers

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2959; Rev 3; 5/04

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.

EVALUATION

KIT

AVAILABLE

PART

TEMP

RANGE

PIN-

PACKAGE

RESOLUTION

(DIGITS)

MAX1492CAI

0

°C to +70°C 28 SSOP

3.5

MAX1492CNI

0

°C to +70°C 28 PDIP

3.5

MAX1494CCJ

0

°C to +70°C 32 TQFP

4.5

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations appear at end of data sheet.

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