TC818A中文资料Display A/D Converters数据手册Microchip规格书

描述 Description

The TC818A is an integrating analog-to-digital converter (ADC)with a 3-1/2 digit numeric LCD driver,automatic ranging,and single 9V battery operation.The numeric display provides 0.05%resolution and a full set of annunciators that spell out the TC818A's many operating modes. Automatic range selection is provided for both voltage (DC and AC)and ohms (high and low power) measurements. Expensive and bulky mechanical range switches are not required.Five full-scale ranges are available,with automatic selection of external volt/ohm attenuators over a 1 to 10,000 range.Two current ranges,20 mA and 200 mA, can be manually selected. The auto-range feature can be bypassed,allowing input attenuator selection through a single line input. During manual mode operation,resolution is extended to 3000 counts full-scale. Extended resolution is also available during 2000k ? and 2000V full-scale auto-range operation. The extended range operation is indicated by a flashing 1 MSD and by the fully-extended bar-graph. The TC818A includes an AC-to-DC converter for AC voltage and current measurements.Only external diodes/resistors/capacitors are required.Other features include a memory mode, low-battery detection, display HOLD input, and continuity buzzer driver. The 3-1/2 digit numeric display includes a full set of annunciators. Decimal points are adjusted as automatic or manual range changes occur,and voltage, current, and ohms operating modes are displayed. Additional annunciators are activated for manual, auto, memory, HOLD, AC, low-power ohms, and low-battery conditions. The TC818A is available in a surface-mounted 64-pin flat package.Combining a numeric display driver,single 9V battery operation,internal range switching,and compact surface mounting,the TC818A is ideal for advanced portable instruments.

特性 Features

Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit DisplayAnnunciator Outputs Permit Customizing of LCDAuto-Range Operation for AC and DC Voltage and Resistance MeasurementsTwo User-Selected AC/DC Current Ranges:20mA and 200mA22 Operating Ranges ...................9 DC/AC Voltage4 AC/DC Current9 Resistance and Low-Power OhmsDisplay Hold Function3-1/2 Digit Resolution in Auto-Range Mode 1/2000Extended Resolution in Manual Range Mode..1/3000Internal AC-to-DC Conversion Op AmpTriplex LCD Drive for Decimal Points,Digits, Bar-Graphs,and AnnunciatorsContinuity Detection and Piezoelectric Transducer DriverLow-Drift Internal Reference ..................75ppm/°C9V Battery Operation...............................10mWLow Battery Detection and LCD Annunciator