MAX1495 查看數據表（PDF） - Maxim Integrated

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MAX1495

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

Maxim Integrated 

19-3053; Rev 2; 5/04

EVAALVUAAILTAIOBNLEKIT

3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

General Description

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 ±200mV 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.

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 >100dB rejec-

tion of 50Hz and 60Hz 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.

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 0°C to +70°C commercial tempera-

ture range.

Digital Panel Meters

Hand-Held Meters

Digital Voltmeters

Digital Multimeters

Applications

Ordering Information

PART

MAX1491CAI

MAX1491CNI

MAX1493CCJ

MAX1495CCJ

TEMP

RANGE

PIN-

PACKAGE

0°C to +70°C 28 SSOP

0°C to +70°C 28 DIP

0°C to +70°C 32 TQFP

0°C to +70°C 32 TQFP

RESOLUTION

(DIGITS)

3.5

3.5

4.5

4.5

Features

♦ 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

♦ 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)

Pin Configurations

TOP VIEW

AVDD 1

AIN+ 2

AIN- 3

REF- 4

REF+ 5

LOWBATT 6

RANGE 7

DPSET1 8

32 31 30 29 28 27 26 25

MAX1493

MAX1495

24 SEG13

23 SEG12

22 SEG11

21 SEG10

20 SEG9

19 SEG8

18 SEG7

17 SEG6

9 10 11 12 13 14 15 16

TQFP

Pin Configurations continued at end of data sheet.

________________________________________________________________ Maxim Integrated Products 1

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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