TC7109CPL

Analog To Digital Converters (ADC) Overview

The TC7109CPL is a 12-bit plus sign CMOS dual-slope integrating Analog-to-Digital Converter (ADC) manufactured by Microchip Technology. It operates within a temperature range of 0°C to +70°C and utilizes a 40-pin PDIP package. The device requires only eight passive components and a crystal to function. Key electrical characteristics include a typical input bias current of 1pA, input noise of 15µV peak-to-peak, and a zero reading drift of less than 1µV/°C. It features true differential signal and reference inputs, supporting ratiometric measurements.

Analog To Digital Converters (ADC) Feature Summary

• 12-Bit Resolution: Provides 12-bit data output with sign magnitude coding format and over-range indication.
• Zero Integrator Cycle: Eliminates cross-talk in multiplexed systems and ensures fast recovery from input overloads.
• Versatile Digital Interface: Supports Direct mode for parallel bus interfacing and Handshake mode for UART serial data transmission.
• Low Power Consumption: Operates with low supply current, typically 700µA at ±5V supplies.

Analog To Digital Converters (ADC) Applications

• Remote data logging systems requiring serial interface capabilities.
• Multiplexed data acquisition systems where cross-talk elimination is critical.
• Precision measurement applications using bridge-type transducers such as load cells and strain gauges.
• Temperature monitoring systems utilizing thermocouples or RTDs.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'CPL' corresponds to the 40-pin Plastic Dual In-line Package (PDIP) with an industrial temperature range of 0°C to +70°C. Confirm that the design utilizes the TC7109A variant if higher output drive capability and improved over-range recovery are required, as the datasheet recommends the 'A' version for new designs. Ensure proper handling procedures for CMOS devices to prevent electrostatic discharge damage during installation.

Analog To Digital Converters (ADC) Selection Notes

Select the TC7109CPL when a 40-pin through-hole package is required for PCB assembly. This model is suitable for applications operating between 0°C and +70°C; for wider temperature ranges (-25°C to +85°C), consider the TC7109IJL ceramic DIP variant. Ensure the system design accommodates the necessary external passive components, including the integrator capacitor, auto-zero capacitor, and reference capacitors, as specified in the typical application circuit. Verify power supply requirements of ±5V for optimal performance.

Analog To Digital Converters (ADC) Part Context

The TC7109CPL belongs to the TC7109/A family of 12-bit µA-compatible analog-to-digital converters. It is an evolution of earlier single-slope or lower-resolution ADCs, offering improved linearity and input impedance. The 'C' suffix denotes the commercial temperature grade, while 'P' indicates the plastic package type. This component serves as a high-precision front-end for microprocessor-based data acquisition systems, replacing older discrete solutions or lower-performance integrated circuits.

Analog To Digital Converters (ADC) Replacement Considerations

The TC7109A is the recommended successor to the TC7109, offering improved output drive capability and faster overload recovery. For pin-compatible replacements with different packaging, the TC7109CKW (44-pin PQFP) and TC7109CLW (44-pin PLCC) are available. If ceramic packaging is needed for extended temperature ranges, the TC7109IJL is the appropriate alternative.