Datasheet > MAX1491

MAX1491

更新时间： 2024-11-06 14:58:19

品牌	Logo	应用领域
亚德诺 - ADI		驱动驱动器
页数	文件大小	规格书
25页	484K
描述
3位半和4位半、单片ADC，带有LCD驱动器

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数据手册

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MAX1491 数据手册

19-3053; Rev 2; 5/04

3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

General Description

Features

The MAX1491/MAX1493/MAX1495 low-power, 3.5- and

4.5-digit, analog-to-digital converters (ADCs) with inte-

grated liquid crystal display (LCD) drivers operate from a

single 2.7V to 5.25V power supply. They include an inter-

nal reference, a high-accuracy on-chip oscillator, and a

triplexed LCD driver. An internal charge pump generates

the negative supply needed to power the integrated input

buffer for single supply operation. The ADC is config-

urable for either a ±2V or ±2±±mV input range and it out-

puts its conversion results to an LCD. The MAX1491 is a

3.5-digit (±1999 count) device, and the MAX1493/

MAX1495 are 4.5-digit (±19,999 count) devices.

♦ High Resolution

MAX1495: 4.5 Digits (±19,999 Count)

MAX1493: 4.5 Digits (±19,999 Count)

MAX1491: 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

The MAX1491/MAX1493/MAX1495 do not require exter-

nal-precision integrating or auto-zero 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 differential signal and reference inputs, allowing

direct interface with high-impedance signal sources. In

addition, the MAX1491/MAX1493/MAX1495 use continu-

ous internal offset calibration, and offer >1±±dB rejec-

tion of 5±Hz and 6±Hz line noise. The MAX1493/

MAX1495 perform enhanced offset calibration at power-

up. The MAX1495 also performs enhanced calibration

on demand. Other features include data hold and peak

hold, and a user programmable low-battery monitor.

♦ Selectable Voltage Reference: Internal 2.048V or

External

♦ Internal High-Accuracy Oscillator Needs No

External Components

♦ Automatic Offset Calibration

♦ Low Power: Maximum 980µA Operating Current

♦ Small 32-Pin 7mm ✕ 7mm TQFP Package (4.5

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

Pin DIP Package (3.5 Digits)

♦ Triplexed LCD Driver

♦ Evaluation Kit Available (Order MAX1494EVKIT)

The MAX1493/MAX1495 come in a 32-pin 7mm ✕ 7mm

TQFP package, and the MAX1491 comes in 28-pin

SSOP and 28-pin DIP packages. All devices in this fam-

ily operate over the ±°C to +7±°C commercial tempera-

ture range.

Pin Configurations

TOP VIEW

32 31 30 29 28 27 26 25

Applications

24 SEG13

SEG12

Digital Panel Meters

Hand-Held Meters

Digital Voltmeters

Digital Multimeters

AIN+

AIN-

22 SEG11

21 SEG10

20 SEG9

19 SEG8

18 SEG7

17 SEG6

REF-

MAX1493

MAX1495

REF+

LOWBATT

RANGE

DPSET1

Ordering Information

TEMP

RANGE

PIN-

PACKAGE

RESOLUTION

(DIGITS)

PART

10 11 12 13 14 15 16

MAX1491CAI

MAX1491CNI

MAX1493CCJ

MAX1495CCJ

±°C to +7±°C 28 SSOP

±°C to +7±°C 28 DIP

±°C to +7±°C 32 TQFP

3.5

4.5

TQFP

Pin Configurations continued at end of data sheet.

________________________________________________________________ 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.

12 3 4 5 6 7...25

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与MAX1491相关器件

型号	品牌	获取价格	描述	数据表
MAX1491\|MAX1493\|MAX1495	MAXIM	获取价格	3.5- and 4.5-Digit. Single-Chip ADCs with LCD Drivers
MAX14912	MAXIM	获取价格	Low Power and Heat Dissipation
MAX14912	ADI	获取价格	八通道、高速、高边开关/推挽式驱动器
MAX14912AKN+T	MAXIM	获取价格	Buffer/Inverter Based Peripheral Driver,
MAX14912EVKIT	MAXIM	获取价格	Reverse-Voltage Protection
MAX14913	MAXIM	获取价格	Low Power and Heat Dissipation
MAX14913	ADI	获取价格	八通道、高速、高边开关/推挽式驱动器
MAX14913AKN+T	MAXIM	获取价格	Buffer/Inverter Based Peripheral Driver,
MAX14914	MAXIM	获取价格	Reverse Supply Voltage Protection
MAX14914	ADI	获取价格	具有可设置限流功能、推挽驱动器选项和数字输入配置的高侧开关

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