TC7136ACLW713

ADCs/DACs - Special Purpose Overview

The TC7136ACLW713 is a low power, 3-1/2 digit analog-to-digital converter with integrated LCD drivers. It utilizes a dual-slope integrating architecture featuring an integrator output zero phase for fast over-range recovery and ensured first reading accuracy. The device incorporates an internal zener reference voltage circuit with a typical temperature drift of 35ppm/°C, eliminating the need for external references. Key electrical specifications include a maximum noise level of 15µV P-P, high input impedance of 10^12Ω, and low input leakage current of 1pA (typical). Power dissipation is typically 500µW at 9V supply.

ADCs/DACs - Special Purpose Feature Summary

• Low Temperature Drift Internal Reference: TC7136A maintains analog common temperature drift to 35ppm/°C (typical) and 75ppm/°C (maximum).
• High Resolution and Low Noise: Achieves 0.05% resolution with 15µV P-P noise performance and non-linearity error limited to less than 1 count.
• Fast Over Range Recovery: Incorporates an 'integrator output zero' phase to ensure accurate readings immediately following over-range conditions.
• Direct LCD Drive: Contains all necessary segment drivers and backplane drive for direct connection to 3-1/2 digit LCDs without external logic.

ADCs/DACs - Special Purpose Applications

• Thermometry systems requiring precision temperature measurement.
• Bridge readouts for strain gauges, load cells, and null detectors.
• Digital meters for voltage, current, ohms, power, and pH measurements.
• Portable instrumentation powered by 9V batteries due to low power dissipation.

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity through authorized Microchip Technology distributors or official channels. Confirm package integrity upon receipt, as moisture sensitivity level is 3. Ensure storage conditions comply with humidity requirements prior to soldering. Cross-reference the full part number TC7136ACLW713 to confirm the specific PLCC-44 package and commercial temperature range variant.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7136A variant over the standard TC7136 when superior thermal stability is required, given its improved internal reference drift of 35ppm/°C compared to 70ppm/°C. Ensure the application operates within the 0°C to +70°C commercial temperature range. For battery-powered designs, verify that the 500µW typical power dissipation aligns with system energy constraints. External passive components such as CINT and CAZ must be selected based on the desired full-scale voltage range and conversion rate.

ADCs/DACs - Special Purpose Part Context

The TC7136ACLW713 belongs to the TC7136 family of low-power 3-1/2 digit ADCs manufactured by Microchip Technology. It serves as a drop-in replacement for legacy devices like the TC7126 and ICL7126, allowing for system upgrades with minor changes to external passive components. The 'CLW' suffix denotes the 44-pin Plastic Leadless Chip Carrier (PLCC) package configuration.

ADCs/DACs - Special Purpose Replacement Considerations

The datasheet identifies the TC7136 as a drop-in replacement for TC7126 and ICL7126 systems. Upgrading from TC7126 to TC7136A requires minor component value adjustments to optimize noise performance and leverage the improved internal reference temperature coefficient.