TC7117CPL

ADCs/DACs - Special Purpose Overview

The TC7117CPL is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It integrates seven-segment decoders, polarity and digit drivers, a voltage reference, and clock circuitry to construct a measurement system with 0.05% resolution. The device features a low temperature drift internal reference (80 ppm/°C typical), display hold functionality, and direct drive capability for common anode LED displays with an 8mA segment current. It operates on a single +5V supply or ±5V supplies, offering high-impedance differential inputs with 1pA leakage current and 15µV peak-to-peak noise performance.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 3-1/2 digit ADC with 7-segment decoders and LED driver outputs
• Low temperature drift internal reference: 80 ppm/°C typical
• Display Hold function maintains reading indefinitely while conversions continue
• High-impedance differential inputs: 10^12 ohm impedance, 1pA leakage

ADCs/DACs - Special Purpose Applications

• Thermometry systems
• Bridge readouts including strain gauges and load cells
• Digital meters for voltage, current, ohms, power, and pH
• Portable instrumentation powered by 9V batteries

ADCs/DACs - Special Purpose Procurement Notes

Verify the package code CPL corresponds to the 40-Pin PDIP variant with a commercial temperature range of 0°C to +70°C. Confirm RoHS compliance status through official Microchip documentation prior to integration. Ensure the ordering suffix matches the specific device revision required for the application.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7117CPL when driving common anode LED displays directly is required. Use this part over the TC7116 series if LCD backplane generation is not needed. For applications requiring lower reference drift, consider the TC7117ACPL variant which offers 20 ppm/°C typical drift. Ensure the input signal range aligns with the 200mV or 2V full-scale options supported by the external component selection.

ADCs/DACs - Special Purpose Part Context

The TC7117CPL belongs to the TC7116/A and TC7117/A family of 3-1/2 digit CMOS ADCs. It is functionally identical to the TC7117 but packaged in a 40-pin PDIP format suitable for through-hole mounting. This family reduces linearity error to less than 1 count and includes auto-zero cycles to eliminate offset adjustments.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7117ACPL serves as a direct functional replacement with improved reference drift characteristics (20 ppm/°C vs 80 ppm/°C). Other package variants such as TC7117CLW (PLCC) or TC7117CKW (PQFP) offer the same electrical performance in surface-mount formats.