Datasheet > MAX1497|MAX1499

MAX1497|MAX1499

更新时间： 2024-11-14 23:45:43

品牌	Logo	应用领域
美信 - MAXIM		驱动器
页数	文件大小	规格书
33页	663K
描述
3.5- and 4.5-Digit. Single-Chip ADCs with LED Drivers and 礐 Interface

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MAX1497|MAX1499 数据手册

19-3054; Rev 1a; 2/04

3.5- and 4.5-Digit, Single-Chip ADCs with LED

Drivers and µC Interface

General Description

Features

The MAX1497/MAX1499 low-power, 3.5- and 4.5-digit,

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

emitting diode (LED) 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 multi-

plexed LED display driver. An internal charge pump

generates the negative supply needed to power the

integrated input buffers for single-supply operation. The

ADC is configurable for either a ±2V or ±2±±mV input

range and it outputs its conversion results to an LED

and/or to a microcontroller (µC). Microcontroller

communication is possible through an SPI™-/QSPI™-

/MICROWIRE™-compatible serial interface. The

MAX1497 is a 3.5-digit (±1999 count) device and the

MAX1499 is a 4.5-digit (±19,999 count) device.

✕ High Resolution

MAX1499: 4.5 Digits (±19,999 Count)

MAX1497: 3.5 Digits (±1999 Count)

✕ Sigma-Delta ADC Architecture

No Integrating Capacitors Required

No Autozeroing Capacitors Required

>100dB of Simultaneous 50Hz and 60Hz

Rejection

✕ Operate from a Single 2.7V or 5.25V Supply

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

✕ Selectable Voltage Reference: Internal 2.048V or

External

✕ Internal High-Accuracy Oscillator Needs No

External Components

✕ Automatic Offset Calibration

The MAX1497/MAX1499 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).

✕ Low Power (Exclude LED Driver Current)

Maximum 664µA Operating Current

Maximum 268µA Shutdown Current

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 >1±±dB rejection of 5±Hz and 6±Hz line noise.

Other features include data hold and peak detection,

overrange and underrange detection, and a user-pro-

grammable low-battery monitor.

✕ Small 32-Pin, 7mm x 7mm TQFP Package (4.5

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

✕ Also Available in a PDIP Package (3.5 Digits)

✕ Multiplexed LED Drivers

Resistor-Programmable Segment Current

✕ SPI-/QSPI-/MICROWIRE-Compatible Serial

Interface

The MAX1499 is available in a 32-pin, 7mm ✕ 7mm

TQFP package and the MAX1497 is available in 28-pin

SSOP and 28-pin PDIP packages. All devices in this

family operate over the -4±°C to +85°C extended tem-

perature range.

✕ Extended Temperature Range (-40°C to +85°C)

Applications

Digital Panel Meters

Ordering Information

PIN-

RESOLUTION

(DIGITS)

PART

TEMP RANGE

PACKAGE

Hand-Held Meters

MAX1497EAI* -4±°C to +85°C 28 SSOP

MAX1497EPI -4±°C to +85°C 28 PDIP

3.5

4.5

Digital Voltmeters

Digital Multimeters

MAX1499ECJ -4±°C to +85°C 32 TQFP

*Future product—contact factory for availability.

Pin Configurations appear at end of data sheet.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

________________________________________________________________ Maxim Integrated Products

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.

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