|Category||Data Conversion => DAC (Digital to Analog Converters) => Display A/D Converters|
|Title||Display A/D Converters|
|Description||The TC7129 is a 4-1/2 Digit Analog-to-digital Converter (ADC)that Directly Drives a Multiplexed Liquid Crystal Display (LCD)|
|Company||Microchip Technology, Inc.|
|Datasheet||Download TC7129 datasheet
|Cross ref.||Similar parts: ICL7129A|
|4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers
Count Resolution: ±19,999 Resolution on 200mV Scale: 10µV True Differential Input and Reference Low Power Consumption: at 9V Direct LCD Driver for 4-1/2 Digits, Decimal Points, Low Battery Indicator, and Continuity Indicator Over Range and Under Range Outputs Range Select Input: 10:1 High Common Mode Rejection Ratio: 110dB External Phase Compensation Not Required
The a 4-1/2 digit analog-to-digital converter (ADC) that directly drives a multiplexed liquid crystal display (LCD). Fabricated in high performance, low power CMOS, the TC7129 ADC is designed specifically for high resolution, battery powered digital multimeter applications. The traditional dual slope method of A/D conversion has been enhanced with a successive integration technique to produce readings accurate to better than 0.005% of full scale, and resolution down to 10µV per count. The TC7129 includes features important to multimeter applications. It detects and indicates low battery condition. A continuity output drives an annunciator on the display, and can be used with an external driver to sound an audible alarm. Over range and under range outputs and a range change input provide the ability to create auto-ranging instruments. For snapshot readings, the TC7129 includes a latch-and-hold input to freeze the present reading. This combination of features makes the TC7129 the ideal choice for full featured multimeter and digital measurement applications.Applications
Full Featured Multimeters Digital Measurement Devices
Package Code TC7129CKW TC7129CLW Pin Layout Normal Formed Package 40-Pin PDIP 44-Pin PQFP 44-Pin PLCC Temperature Range to +70°C
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
Supply Voltage (V+ to V-)....................................... 15V Reference Voltage (REF HI or REF LO)......... V+ to VInput Voltage (IN or IN LO) (Note V+ to VVDISP.......................................... V+ to (DGND 0.3V) Digital Input (Pins DGND to V+ Analog Input (Pins V+ to VPackage Power Dissipation (TA 70°C) Plastic DIP..................................................... 1.23W PLCC............................................................. 1.23W Plastic QFP.................................................... 1.00W Operating Temperature Range............... to +70°C Storage Temperature Range.............. to +150°C
Electrical Characteristics: = 9V, VREF = +25°C, fCLK = 120kHz, unless otherwise indicated. Pin numbers refer to 40-pin DIP. Symbol Input Zero Input Reading Zero Reading Drift Ratiometric Reading Range Change Accuracy RE NL CMRR CMVR eN IIN Rollover Error Linearity Error Common Mode Rejection Ratio Common Mode Voltage Range Noise (Peak-to-Peak Value not Exceeded 95% of Time) Input Leakage Current Scale Factor Temperature Coefficient Power VCOM Common Voltage Common Sink Current Common Source Current DGND Digital Ground Voltage Sink Current Supply Voltage Range IS Supply Current Excluding Common Current V+ to Pin 28 Common = +0.1V Common V+ to Pin = 9V DGND V+ to VV+ = 9V (V-) + 1.5 (V+) Counts µ V/°C Counts Ratio Counts dB V µVP-P pA ppm/°C VIN 0V, 200mV Scale VIN < +70°C VIN = VREF = 1000mV, Range = 2V VIN 1V on High Range, VIN 0.1V on Low Range VIN- = VIN+ 199mV 200mV Scale VCM = 1V, VIN 0V, 200mV Scale VIN 0V 200mV Scale VIN 0V 200mV Scale VIN = 0V, Pins 32, 33 VIN < +70°C External VREF = 0ppm/°C Parameter Min Typ Max Unit Test Conditions
Note 1: Input voltages may exceed supply voltages, provided input current is limited to ±400µA. Currents above this value may result in invalid display readings, but will not destroy the device if limited to ±1mA. Dissipation ratings assume device is mounted with all leads soldered to printed circuit board.
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|TC7129CKW 4-1/2 Digit Analog-to-digital Converters With On-chip LCD Drivers<<<>>>the TC7129 is a 4-1/2 Digit Analog-to-digital Converter<<<>>>(ADC) That Directly Drives a Multiplexed Liquid Crystal<<<>>>display|
|TC7129CKW The TC7129 is a 4-1/2 Digit Analog-to-digital Converter (ADC)that Directly Drives a Multiplexed Liquid Crystal Display (LCD)|
|TC7129CLW 4-1/2 Digit Analog-to-digital Converters With On-chip LCD Drivers<<<>>>the TC7129 is a 4-1/2 Digit Analog-to-digital Converter<<<>>>(ADC) That Directly Drives a Multiplexed Liquid Crystal<<<>>>display|
|TC7129CLW The TC7129 is a 4-1/2 Digit Analog-to-digital Converter (ADC)that Directly Drives a Multiplexed Liquid Crystal Display (LCD)|
|TC7129CPL 4-1/2 Digit Analog-to-digital Converters With On-chip LCD Drivers<<<>>>the TC7129 is a 4-1/2 Digit Analog-to-digital Converter<<<>>>(ADC) That Directly Drives a Multiplexed Liquid Crystal<<<>>>display|
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