TC7126ARIPL Datasheet

IC型號(hào)：
TC7126ARIPL
PDF描述：
3-1/2 Digit Analog-to-Digital Converters
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553.84KB
PDF頁(yè)數(shù)：
22頁(yè)
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MICROCHIP

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TC7126/A

3-1/2 Digit Analog-to-Digital Converters

Features

鈥?Internal Reference with Low Temperature Drift

- TC7126: 80ppm/擄C Typical

- TC7126A: 35ppm/擄C Typical

鈥?Zero Reading with Zero Input

鈥?Low Noise: 15碌V

P-P

鈥?High Resolution: 0.05%

鈥?Low Input Leakage Current: 1pA Typ., 10pA Max.

鈥?Precision Null Detectors with True Polarity at Zero

鈥?High-Impedance Differential Input

鈥?Convenient 9V Battery Operation with Low Power

Dissipation: 500碌W Typ., 900碌W Max.

General Description

The TC7126A is a 3-1/2 digit CMOS analog-to-digital

converter (ADC) containing all the active components

necessary to construct a 0.05% resolution measure-

ment system. Seven-segment decoders, digit and

polarity drivers, voltage reference, and clock circuit are

integrated on-chip. The TC7126A directly drives a liq-

uid crystal display (LCD), and includes a backplane

driver.

A low cost, high resolution indicating meter requires

only a display, four resistors, and four capacitors. The

TC7126A's extremely low power drain and 9V battery

operation make it ideal for portable applications.

The TC7126A reduces linearity error to less than 1

count. Rollover error (the difference in readings for

equal magnitude, but opposite polarity input signals) is

below 鹵1 count. High-impedance differential inputs

offer 1pA leakage current and a 10

鈩?/div>

input imped-

ance. The 15碌V

P-P

noise performance ensures a "rock

solid" reading, and the auto-zero cycle ensures a zero

display reading with a 0V input.

The TC7126A features a precision, low drift internal

voltage reference and is functionally identical to the

TC7126. A low drift external reference is not normally

required with the TC7126A.

Applications

鈥?Thermometry

鈥?Bridge Readouts: Strain Gauges, Load Cells,

Null Detectors

鈥?Digital Meters and Panel Meters:

- Voltage/Current/Ohms/Power, pH

鈥?Digital Scales, Process Monitors

Device Selection Table

Package

Code

CPL

IPL

CKW

CLW

Package

40-Pin PDIP

40-Pin PDIP (TC7126 Only)

44-Pin PQFP

44-Pin PLCC

Temperature

Range

0擄C to +70擄C

-25擄C to +85擄C

0擄C to +70擄C

2002 Microchip Technology Inc.

DS21458B-page 1

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