Datasheet > MAX1493

MAX1493

更新时间： 2024-09-23 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		驱动器
页数	文件大小	规格书
25页	564K
描述
3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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MAX1493 数据手册

19-3053; Rev 0; 10/03

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 (±1,999 count) device, and the MAX1493/

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

ꢀ High Resolution

MAX1495: 4.5 Digits ( 19ꢀ999 ꢁountꢂ

MAX1493: 4.5 Digits ( 19ꢀ999 ꢁountꢂ

MAX1491: 3.5 Digits ( 1999 ꢁountꢂ

ꢀ Sigma-Delta ADꢁ Architecture

No Integrating ꢁapacitors Required

No Autozeroing ꢁapacitors 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, crys-

tal 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 contin-

uous 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 cali-

bration 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 ꢁomponents

ꢀ Automatic Offset ꢁalibration

ꢀ Low Power: Maximum 980µA Operating ꢁurrent

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

Digitsꢂꢀ 28-Pin SSOP Package (3.5 Digitsꢂꢀ and 28-

Pin DIP Package (3.5 Digitsꢂ

ꢀ Triplexed LꢁD Driver

ꢀ Evaluation Kit Available (Order MAX1494EVKITꢂ

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

PIN-

RESOLUTION

(DIGITSꢂ

PART

RANGE

PAꢁKAGE

10 11 12 13 14 15 16

MAX1491CAI* 0°C to +70°C 28 SSOP

3.5

4.5

MAX1491CNI

0°C to +70°C 28 DIP

0°C to +70°C 32 TQFP

MAX1493CCJ

TQFP

MAX1495CCJ* 0°C to +70°C 32 TQFP

Pin Configurations continued at end of data sheet.

*Future product—contact factory for availability.

________________________________________________________________ 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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