TC7126A

The TC7126A is a 3½ digit CMOS analog-to-digital converter (ADC) containing all the active components necessary to construct a 0.05% resolution measurement system. Seven-segment decoders, digit and polarity drivers, voltage reference, and clock circuit are integrated on-chip. The TC7126A directly drives a liquid crystal display (LCD), and includes a backplane driver. A low-cost, high-resolution indicating meter requires only a display, four resistors, and four capacitors. The TC7126A's extremely low power drain and 9V battery operation make it ideal for portable applications. The TC7126A reduces linearity error to less than 1 count. Roll-over error (the difference in readings for equal magnitude but opposite polarity input signals) is below ±1 count. High-impedance differential inputs offer 1 pA leakage current and a 1012 ohm input impedance. The 15 µVp-p noise performance guarantees a great reading, and the auto-zero cycle guarantees a zero display reading with a 0V input. The TC7126A features a precision, low-drift internal voltage reference and is functionally identical to the TC7126. A low-drift external reference is not normally required with the TC7126A.

Features
  • Fast Overrange Recovery, Guaranteed First Reading Accuracy
  • Low Temperature Drift Internal Reference 35 ppm/°C Typ.
  • 35 ppm/°C Typ.
  • Guaranteed Zero Reading with Zero Input
  • Low Noise: 15 µVp-p
  • High Resolution: 0.05%
  • Low Input Leakage Current: 1pA Typ., 10pA Max
  • Precision Null Detectors with True Polarity at Zero
  • High-Impedance Differential Input
  • Convenient 9V Battery Operation
  • Low Power Dissipation: 500µW Typ., 900µW Max.
Parameter
Parameter Name Value Value
Supply Voltage (V) 9 9
Power (mW) 0.5 0.5
Resolution (Digits) 3.5 3.5
Resolution (Counts) 2000 2000
Display Type LCD LCD
Temp. Range (°C) -25 to 85 -25 to 85
Documents
TC7126/126A Data SheetData Sheets02/05/2013313KB
Analog & Interface Guide (Volume 2)Brochures10/11/20051067KB
Quick Guide to Microchip Development ToolsBrochures10/15/201411223KB
Analog & Interface Product Selector GuideProduct Line Card03/21/20164116KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
TC7126ACKW44MQFP0C to +70CTRAY10.088.407.646.375.88
TC7126ACKW71344MQFP0C to +70CT/R10.088.407.646.375.88
TC7126ACPL40PDIP0C to +70CTUBE8.537.116.465.384.97
Similar Devices
ProductDisplay TypeSupply Voltage (V)Resolution (Digits)Price5K
TC7106LCD93.5$2.83
TC7106ALCD93.5$2.80
TC7107LED53.5$2.46
TC7107ALED53.5$2.64
TC7116LCD93.5$3.33
TC7116ALCD93.5$3.56
TC7117LED53$4.75
TC7117ALED53$3.71
TC7126LCD93.5$3.57
TC7126ALCD93.5$4.61
TC7129LCD94.5$7.60
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
TC7126ACPL6.50000010.60000040PDIP.600inMatte Tine3
TC7126ACLW2.3755003.70370444PLCC-Matte Tine3
TC7126ACKW0.4854003.89583344MQFP10x10x2mmMatte Tine3
TC7126ACKW7130.4854001.29666744MQFP10x10x2mmMatte Tine3
TC7126/126A Data Sheet TC7126A
Analog & Interface Guide (Volume 2) MCP23S08
Quick Guide to Microchip Development Tools ENC28J60
Analog & Interface Product Selector Guide ENC624J600