TC7107AIPL

ADCs/DACs - Special Purpose Overview

The TC7107AIPL is a 3-1/2 digit dual-slope integrating Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It features an internal precision voltage reference with a typical temperature drift of 20 ppm/°C, offering significant stability improvements over standard variants. The device directly drives common-anode LED displays with segment sinking currents up to 8 mA per segment and 16 mA for the thousands digit. Key electrical specifications include a maximum supply current of 1.8 mA, operation at a nominal 5 V supply, and a power dissipation rating of 1.23 W in its 40-pin PDIP package. It supports industrial temperature ranges from -25°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• Internal low-drift reference: 20 ppm/°C typical temperature coefficient for TC7107A series.
• Direct LED drive capability: Sinks 8 mA per segment (16 mA for Pin 19) for common-anode displays.
• High-impedance inputs: CMOS differential inputs with 10^12 Ω impedance and 1 pA leakage current.
• Auto-zero cycle: Eliminates offset voltage errors, ensuring zero reading with zero input without external adjustment.

ADCs/DACs - Special Purpose Applications

• Thermometry and temperature sensing instruments.
• Bridge readouts for strain gauges and load cells.
• Digital meters for voltage, current, resistance, and power measurement.
• Portable instrumentation powered by 9V batteries.
• Process monitors and digital scales requiring high resolution.

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'IPL' corresponds to the Industrial temperature range (-25°C to +85°C) and PDIP-40 package configuration as defined in the official Microchip datasheet DS21455D. Confirm that the ordering part number matches the exact pinout and electrical characteristics required for the target application, particularly regarding the LED drive current requirements.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7107AIPL when direct LED display driving is required without additional buffer circuitry. Ensure the application operates within the industrial temperature range (-25°C to +85°C). For full-scale ranges of 200 mV or 2.0 V, select appropriate integrating resistors (47 kΩ or 470 kΩ) and capacitors (0.22 µF) to maintain linearity. Verify that the clock frequency is set to achieve the desired conversion rate, typically 3 conversions per second at 48 kHz.

ADCs/DACs - Special Purpose Part Context

The TC7107AIPL belongs to 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 superior internal reference with lower temperature drift (20 ppm/°C vs. 80 ppm/°C). This allows existing systems based on older models to be upgraded without changing external passive component values, maintaining compatibility while improving accuracy.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7107AIPL is a drop-in replacement for the TC7107. When substituting, ensure the alternative component supports the same 40-pin PDIP package and provides sufficient segment drive current for the connected LED display. Verify that the replacement maintains the industrial temperature rating if operating conditions exceed commercial limits.