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1

TC820

3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY

COUNTER AND LOGIC PROBE

FEATURES

s

Multiple Analog Measurement System

鈥?Digit A/D Converter

鈥?Frequency Counter

鈥?Logic Probe

s

Low Noise A/D Converter:

鈥?Differential Inputs, (1pA Bias Current)

鈥?On-Chip 50PPM/

擄

C Voltage Reference

s

Frequency Counter:

鈥?4Mhz Maximum Input Frequency

鈥?Auto-ranging Over Four Decade Range

s

Logic Probe:

鈥?Two LCD Annunciators

鈥?Buzzer Driver

s

3-3/4 Digit Display with Overrange Indicator

s

LCD Display Driver with Built-in Contrast Control

s

Data Hold Input for Comparison Measurements

s

Low Battery Detect with LCD Annunciator

s

Underrange and Overrange Outputs

s

On-Chip Buzzer Driver with Control Input

s

44-Pin Plastic Flat Pack or PLCC or 40-Pin Plastic

DIP Packages

2

3

4

Temperature

Range

GENERAL DESCRIPTION

The TC820 is a 3-3/4 digit, multi-measurement system

especially suited for use in portable instruments. It inte-

grates a dual slope A/D converter, auto-ranging frequency

counter and logic probe into a single 44-pin surface mount

or 40-pin through hole package. The TC820 operates from

a single 9V input voltage (battery) and features a built-in

battery low flag. Function and decimal point selection are

accomplished with simple logic inputs designed for direct

connection to an external microcontroller or rotary switch.

Ease of use, low power operation and high functional

integration make the TC820 desirable in a variety of analog

measurement applications.

ORDERING INFORMATION

Part No.

TC820CKW

TC820CLW

Resolution

3-3/4 Digits

3-3/4 Digits

Package

TC820CPL

3-3/4 Digits

44-Pin Plastic

0擄C to +70擄C

Quad Flat Package

44-Pin Plastic

0擄C to +70擄C

Leadless Chip

Carrier

40-Pin Plastic DIP 0擄C to +70擄C

5

6

FUNCTIONAL BLOCK DIAGRAM

TRIPLEX LCD

LOGIC HIGH

LOGIC LOW

OVERRANGE

PKHOLD

LOW BATT

ANNUNCIATOR DRIVE

LOW DRIFT VOLTAGE

DIFFERENTIAL

REFERENCE

CLOCK

OSCILLATOR

TRIPLE LCD

DRIVERS

EOC

UNDERRANGE

OVERRANGE

ANALOG

INPUT

FULL-SCALE

SELECT

FREQUENCY

INPUT

3-3/4 DIGIT

A/D CONVERTER

ANALOG GND

PEAK HOLD

COMPARATOR

DECIMAL

POINT

DRIVERS

DECIMAL

POINT

SELECT

AUTORANGING

FREQUENCY

COUNTER

LOGIC

PROBE

DIGITAL GROUND

LOW

BATTERY

DETECT

BUZZER

DRIVER

BUZZER

CONTROL

FUNCTION

SELECT

VOLTS

FREQUENCY

LOGIC

FUNCTION

SELECT

7

TC820

TO LCD

AND BUZZER

LOGIC

PROBE

INPUT

+

PEAK

HOLD

9V

8

TC820-10 10/17/96

TELCOM SEMICONDUCTOR, INC.

3-149

next

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