TC7135CLI713

ADCs/DACs - Special Purpose Overview

The TC7135CLI713 is a 4-1/2 digit dual-slope integrating analog-to-digital converter manufactured by Microchip Technology. It provides 50 ppm resolution with a maximum nonlinearity error of ±1 count and an auto-zero cycle that reduces zero drift to 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 positive and negative supply voltages, typically +5V and -5V, with low power dissipation characteristics suitable for precision measurement systems.

ADCs/DACs - Special Purpose Feature Summary

• 4-1/2 Digit Resolution: Offers 50 ppm (1 part in 20,000) resolution with ±1 count maximum nonlinearity and rollover errors.
• Low Drift Performance: Auto-zero architecture achieves zero reading drift of 0.5 µV/°C and input leakage current as low as 1 pA.
• Multiplexed Digital Interface: Provides TTL-compatible multiplexed BCD outputs (D1-D5, B1-B8) with BUSY, STROBE, POLARITY, OVERRANGE, and UNDERRANGE status signals.
• Dual-Slope Conversion: Utilizes a four-phase conversion cycle (System Zero, Input Integration, Reference Integration, Integrator Output Zero) for high noise immunity.

ADCs/DACs - Special Purpose Applications

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

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type associated with the CLI suffix against official Microchip documentation to ensure compatibility with the intended PCB footprint. Confirm that the operating temperature range meets the application requirements, as standard variants are rated for 0°C to +70°C. Ensure external component selection, particularly capacitors, adheres to the datasheet recommendations for dielectric absorption and stability.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7135 when high-resolution DC measurements are required with minimal calibration due to its internal auto-zero function. Ensure the external clock frequency is chosen to provide adequate line frequency rejection (e.g., 100 kHz for 50/60 Hz rejection). Verify that the integrating capacitor selected has low dielectric absorption to prevent ratiometric errors, and confirm that the reference voltage source stability supports the desired absolute accuracy.

ADCs/DACs - Special Purpose Part Context

The TC7135 is part of Microchip's family of integrating analog-to-digital converters, serving as a high-precision alternative to successive approximation ADCs in noisy environments. It is designed for applications requiring stable, accurate DC measurements without complex external calibration circuitry. The device integrates the necessary analog front-end and digital logic to drive displays or interface directly with processors via its multiplexed outputs.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements should be sought from the TC713x family, such as the TC7136 or TC7126, noting differences in resolution (3-1/2 vs 4-1/2 digits) and pinout compatibility. Verify that any substitute maintains the dual-slope architecture and compatible digital interface signals (BUSY, STROBE) for seamless integration into existing designs.