© 2007 Microchip Technology Inc. DS21476C-page 1
TC820
Features
• Multiple Analog Measurement System
- Digit A/D Converter
- Frequency Counter
- Logic Probe
• Low Noise A/D Converter:
- Differential Inputs: (1 pA Bias Current)
- On-Chip 50 ppm/°C Voltage Reference
• Frequency Counter:
- 4 MHz Maximum Input Frequency
- Auto-Ranging Over Four Decade Range
• Logic Probe:
- Two LCD Annunciators
- Buzzer Driver
• 3-3/4 Digit Display with Over Range Indicator
• LCD Display Driver with Built-in Contrast Control
• Data Hold Input for Comparison Measurements
• Low Battery Detect with LCD Annunciator
• Under Range and Over Range Outputs
• On-Chip Buzzer Driver with Control Input
• 40-Lead Plastic DIP, 44-Lead Plastic Flat Pack, or
44-Lead PLCC Packages
General Description
The TC820 is a 3-3/4 digit, multi-measurement system
especially suited for use in portable instruments. It
integrates a dual slope A/D converter, auto-ranging fre-
quency counter and logic probe into a single 44-pin sur-
face mount, or 40-pin through hole package. The
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.
3-3/4 Digit A/D Converter with Frequency Counter
and Logic Probe
Obsolete Device
