TC7135CBU

ADCs/DACs - Special Purpose Overview

The TC7135CBU is a 4-1/2 digit dual-slope integrating analog-to-digital converter (ADC) manufactured by Microchip Technology. It provides 50 ppm resolution with a maximum nonlinearity error of ±1 count and a typical zero drift of 0.5 µV/°C. The device features multiplexed BCD data outputs, TTL-compatible logic levels, and control signals including BUSY, STROBE, and RUN/HOLD for microprocessor interfacing. It operates on dual supplies (+5V/-5V typically) with a clock frequency up to 1200 kHz. The CBU suffix indicates the component is packaged in a 28-pin Plastic Dual In-Line Package (PDIP).

ADCs/DACs - Special Purpose Feature Summary

• 4-1/2 Digit Resolution: Offers 50 ppm resolution with ±1 count max nonlinearity and rollover errors.
• Low Drift and Noise: Achieves zero reading drift of 0.5 µV/°C and input leakage current of 1 pA typical.
• Microprocessor Interface: Includes BUSY, STROBE, and RUN/HOLD control pins for UART and processor integration.
• Multiplexed BCD Output: Provides TTL-compatible digit drive and binary coded decimal outputs for direct display scanning.

ADCs/DACs - Special Purpose Applications

• Precision Analog Signal Processing
• High Accuracy DC Voltage Measurements
• Precision Sensor Interfaces
• Microprocessor-Based Measurement Systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type corresponds to the 28-pin PDIP configuration associated with the CBU suffix. Confirm supply voltage requirements match the specified +5V positive and -5V negative rails for optimal performance. Ensure the external clock source meets the frequency specifications for the desired conversion rate.

ADCs/DACs - Special Purpose Selection Notes

Select this component for applications requiring high precision DC measurements with low temperature drift. The dual-slope architecture provides inherent noise immunity, making it suitable for industrial environments. Consider the available packages; the CBU variant is specific to the through-hole PDIP format, while other suffixes may offer surface-mount options like PLCC or MQFP.

ADCs/DACs - Special Purpose Part Context

The TC7135 is part of Microchip's line of integrating ADCs designed for high-accuracy measurement systems. It utilizes a dual-slope conversion technique with an auto-zero cycle to minimize offset errors. The device supports both fixed and adjustable full-scale ranges via external reference voltages and integrating components.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements are not explicitly listed in the provided documentation. When substituting, ensure the alternative device supports dual-slope conversion, similar BCD output formats, and compatible supply voltage ranges. Verify that the replacement offers comparable nonlinearity and drift specifications for precision applications.