TC826 Datasheet

IC型號：
TC826
PDF描述：
Analog-to-Digital Converter with Bar Graph Display Output
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PDF頁數(shù)：
18頁
芯片廠家：
MICROCHIP

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TC826

Analog-to-Digital Converter with Bar Graph Display Output

Features

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Bipolar A/D Conversion

2.5% Resolution

Direct LCD Display Drive

鈥楾hermometer鈥?BAR or DOT Display

40 Data Segments Plus Zero

Over Range Plus Polarity Indication

Precision On-Chip Reference: 35ppm/擄C

Differential Analog Input

Low Input Leakage: 10pA

Display Flashes on Over Range

Display HOLD Mode

Auto-Zero Cycle Eliminates Zero Adjust

Potentiometer

9V Battery Operation

Low Power Consumption: 1.1mW

20mV to 2.0V Full Scale Operation

Non-Multiplexed LCD Drive for Maximum

Viewing Angle

General Description

In many applications, a graphical display is preferred

over a digital display. Knowing a process or system

operates, for example, within design limits is more valu-

able than a direct system variable read out. A bar or

moving dot display supplies information precisely with-

out requiring further interpretation by the viewer.

The TC826 is a complete analog-to-digital converter

with direct liquid crystal (LCD) display drive. The 40

LCD data segments plus zero driver give a 2.5% reso-

lution bar display. Full scale differential input voltage

range extends from 20mV to 2V. The TC826 sensitivity

is 500碌V. A low drift 35ppm/擄C internal reference, LCD

backplane oscillator and driver, input polarity LCD

driver, and over range LCD driver make designs simple

and low cost. The CMOS design required only 125碌A

from a 9V battery. In +5V systems, a TC7660 DC to DC

converter can supply the -5V supply. The differential

analog input leakage is a low 10pA.

Two display formats are possible. The BAR mode dis-

play is like a 鈥榯hermometer鈥?scale. The LCD segment

driver that equals the input, plus all below it are on. The

DOT mode activates only the segment equal to the

input. In either mode, the polarity signal is active for

negative input signals. An over range input signal

causes the display to flash and activates the over range

annunciator. A HOLD mode can be selected that

freezes the display and prevents updating.

The dual slope integrating conversion method with

auto-zero phase maximizes noise immunity and elimi-

nates zero scale adjustment potentiometers. Zero

scale drift is a low 5碌V/擄C. Conversion rate is typically

5 per second and is adjustable by a single external

resistor.

A compact, 0.5" square, flat package minimizes PC

board area. The high pin count LSI package makes

multiplexed LCD displays unnecessary. Low cost,

direct drive LCD displays offer the widest viewing angle

and are readily available. A standard display is avail-

able now for TC826 prototyping work.

Device Selection Table

Part Number

TC826CBU

Package

64-Pin PQFP

Temperature Range

0擄C to +70擄C

2002 Microchip Technology Inc.

DS21477B-page 1

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