TC7107ACPL

ADCs/DACs - Special Purpose Overview

The TC7107ACPL is a 3-1/2 digit integrating Analog-to-Digital Converter (ADC) from Microchip Technology, designed to directly drive common anode LED displays. It features a precision internal reference with a typical temperature coefficient of 20 ppm/°C for the 'A' variant. The device operates on dual-slope conversion principles, offering high input impedance (10^12 Ω) and low leakage current (1 pA). Key electrical specifications include a peak-to-peak noise of 15 µV at 200 mV full scale, linearity error within ±1 count, and a supply current of 0.8 mA to 1.8 mA. It supports 9V battery operation and provides true polarity indication.

ADCs/DACs - Special Purpose Feature Summary

• Directly drives common anode LED displays with segment sinking currents up to 8 mA per segment (16 mA for the thousands digit).
• Internal precision voltage reference with low temperature drift: 20 ppm/°C typical for TC7107A.
• High-impedance differential inputs with 10^12 Ω impedance and 1 pA leakage current.
• Auto-zero cycle eliminates offset errors, ensuring zero reading with zero input without external adjustment.

ADCs/DACs - Special Purpose Applications

• Digital meters for voltage, current, ohms, and power measurements.
• Bridge readouts including strain gauges and load cells.
• Thermometry and process monitors.
• Portable instrumentation requiring low-power operation.

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type corresponds to the CPL suffix, which indicates a 40-pin Plastic Dual In-line Package (PDIP). Confirm the operating temperature range matches the application requirements; 'C' devices operate from 0°C to +70°C, while 'I' devices operate from -25°C to +85°C. Ensure the system design accommodates the specific supply voltage constraints for the TC7107A variant (+6V max V+, -9V min V-).

ADCs/DACs - Special Purpose Selection Notes

Select the TC7107ACPL when a direct LED display interface is required, as opposed to the LCD-driven TC7106A. For applications requiring ratiometric measurements or bridge transducer inputs, utilize the differential reference inputs. Choose the industrial grade ('I') if operation below 0°C is necessary. Ensure the clock frequency is set to 48 kHz for standard 3 conversions per second performance using the recommended RC oscillator components.

ADCs/DACs - Special Purpose Part Context

The TC7107ACPL is part of the TC7106/A and TC7107/A family of 3-1/2 digit ADCs. It serves as an upgraded version of the original TC7107, featuring a lower drift internal reference (20 ppm/°C vs 80 ppm/°C). It is functionally compatible with existing TC7107 designs, allowing upgrades without changing external passive component values. The device integrates the analog front-end, auto-zero circuitry, and digital segment drivers into a single chip.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7107ACPL is a drop-in replacement for the TC7107. When replacing the older TC7107, no changes to external passive component values are required to benefit from the improved temperature coefficient. Ensure the replacement part number includes the correct suffix for the desired temperature range (C for commercial, I for industrial).