|Company||Microchip Technology, Inc.|
|Datasheet||Download TC7129CLP datasheet
|TC7129 4-1/2 Digit Analog-To-Digital Converter with On-Chip LCD Drivers
Count Resolution......................................... ±19,999 Resolution 200 mV 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 Overrange and Underrange 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. Overrange and underrange outputs and a rangechange 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.
Supply Voltage to V)............................................ 15V Reference Voltage (REF HI or REF LO).............. to V Input Voltage (IN or IN LO) (Note to V VDISP................................................V+ to (DGND 0.3V) Digital Input, Pins DGND to V+ Analog Input, Pins to V Package 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 Lead Temperature (Soldering, 10 sec)................. +300°C (V+
Notes: Input voltages may exceed supply voltages, provided input current is limited to ±400 µA. Currents above this value may result in invalid display readings but will not destroy the device if limited to ±1 mA. Dissipation ratings assume device is mounted with all leads soldered to printed circuit board. *Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. 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 operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.ELECTRICAL CHARACTERISTICS: = 9V, VREF = +25°C, fCLK = 120 kHz, unless otherwise
Input Zero Input Reading Zero Reading Drift Ratiometric Reading Range Change Accuracy RE NL CMRR CMVR eN IIN Roll-Over 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 Common Voltage Common Sink Current Common Source Current Digital Ground Voltage Sink Current Supply Voltage Range Supply Current Excluding Common Current Clock Frequency VDISP Resistance Low-Battery Flag Activation Voltage Continuity Comparator Threshold Voltages Pull-Down Current
VIN 0V, 200mV Scale VIN < +70°C VIN = VREF = 1000mV, Range = 2V VIN 0.1V on Low Range VIN 1V on High Range VIN = +VIN 200 mV Scale VCM = 1V, VIN 0V, 200mV Scale VIN 200 mV Scale VIN 0V 200mV Scale VIN = 0V, Pins 32, 33 VIN < +70°C External VREF V+ to Pin 28 Common = +0.1V Common V+ to Pin = 9V DGND = 9V VDISP to V VOUT Pin 27 = High VOUT Pin 27 = Low Pins 38, 39Counts µV/°C Counts Ratio Counts dB V µVP-P pA ppm/°C
ELECTRICAL CHARACTERISTICS: = 9V, VREF = +25°C, fCLK = 120 kHz, unless otherwise
indicated. Pin numbers refer to 40-pin DIP. Symbol Parameter
"Weak Output" Current Sink/Source Pin 22 Source Current Pin 22 Sink Current
OSC1 OSC3 ANNUNICATOR DRIVE B1, C1, CONT C2, LO BATT DP2 37 RANGE 36 DGND 35 REF LO 34 REF IN LO
|Some Part number from the same manufacture Microchip Technology, Inc.|
|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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