TC7106ACKW

ADCs/DACs - Special Purpose Overview

The TC7106ACKW is a 3½-digit dual-slope Analog-to-Digital Converter (ADC) manufactured by Microchip Technology, housed in a 44-pin MQFP package. It features an internal precision voltage reference with a maximum temperature coefficient of 20 ppm/°C. The device operates on a single supply voltage ranging from 5V to 9V and consumes a maximum power current of 1.8 mA. Key electrical specifications include a peak-to-peak noise performance of 15 µV, an input impedance of 10^12 Ω, and a leakage current of 1 pA. It supports full-scale input ranges of 200 mV or 2.0 V and provides direct drive capabilities for LCD displays.

ADCs/DACs - Special Purpose Feature Summary

• Internal Precision Reference: Features a low-drift internal reference with a typical temperature coefficient of 20 ppm/°C.
• Direct Display Drive: Contains segment drivers capable of directly driving common-cathode LCD displays without external logic.
• High Input Impedance: Offers true differential inputs with 10^12 Ω impedance and 1 pA leakage current.
• Auto-Zero Cycle: Eliminates offset voltage errors from the integrator and comparator, ensuring zero reading at zero input.

ADCs/DACs - Special Purpose Applications

• Thermometry
• Bridge Readouts including Strain Gauges and Load Cells
• Digital Meters for Voltage, Current, Ohms, Power, and pH
• Portable Instrumentation powered by 9V batteries

ADCs/DACs - Special Purpose Procurement Notes

Verify the package type matches the design requirements, as this component is available in multiple form factors including PLCC and MQFP. Confirm the suffix 'KW' corresponds to the specific tape-and-reel or tube packaging configuration required for the assembly process. Ensure the commercial temperature range (0°C to +70°C) aligns with the operational environment constraints.

ADCs/DACs - Special Purpose Selection Notes

Select the TC7106ACKW when an LCD display interface is required, distinguishing it from the TC7107A which drives LEDs. For applications requiring LED output, the TC7107A variant must be used instead. Consider the 9V battery operation capability for portable designs. Verify that the external integrating capacitor and resistor values are selected to match the desired full-scale voltage range of either 200 mV or 2.0 V.

ADCs/DACs - Special Purpose Part Context

This component belongs to the TC7106/A family of 3½-digit ADCs. It serves as a drop-in replacement for earlier TC7106 models, offering improved temperature stability due to the integrated low-drift reference. The device integrates the analog-to-digital conversion logic with the digital display driver circuitry, simplifying the design of high-resolution indicating meters.

ADCs/DACs - Special Purpose Replacement Considerations

The TC7106A is functionally compatible with the legacy TC7106 part number. Existing systems designed around the TC7106 can be upgraded to the TC7106A without changing external passive component values to benefit from the reduced temperature coefficient.

ADCs/DACs - Special Purpose FAQ

What is the typical temperature coefficient of the internal reference?

The TC7106A features an internal reference with a typical temperature coefficient of 20 ppm/°C.

How does the auto-zero cycle affect measurement accuracy?

The auto-zero cycle removes offset voltage errors from the buffer amplifier, integrator, and comparator, resulting in a true digital zero reading when the input is zero volts.

What is the recommended oscillator frequency for 3 conversions per second?

An oscillator frequency of 48 kHz is recommended to achieve a conversion rate of 3 readings per second.