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Part No.	TC7106A
Manufacturer	MICROCHIP
Size	534 Kbytes
Pages	32 pages
Description	3-1/2 Digit Analog-to-Digital Converters

Datasheet Summary with AI

1. Overview & Purpose:

️· The document describes the TC7106A and TC7107A, which are dual-slope, integrating analog-to-digital converters (ADCs).
️· They are specifically designed to be used in systems requiring high accuracy and noise immunity.
️· The document explains how they work, their features, and how to interface them.

2. Dual Slope Conversion Principles (Section 3.1):

️· Dual Slope: The ADCs use a dual-slope conversion technique, involving two distinct phases: Signal Integration and Reference Voltage Integration (De-integration).
️· Benefits: Dual-slope converters are known for their accuracy and noise immunity. Noise is effectively averaged out during the integration periods.
️· Equation 3-1: Gives the relationship between the input signal, reference voltage, and integration time.

3. Analog Section (Section 4):

️· Auto-Zero Cycle: A crucial feature. It corrects for offset voltages in the circuit, ensuring high accuracy without needing external calibration. The cycle length is 1000-3000 counts.
️· Signal Integrate Cycle: The input signal is integrated for a fixed time.
️· Reference Integrate Phase: The integrator output returns to zero, and the time taken is proportional to the input signal.
️· Equation 4-2: Expresses the digital reading based on the integration times.
️· Common Mode Range: The differential input voltage must be within the device’s common mode range.

4. Digital Section (TC7106A):

️· Direct Drive: The TC7106A has built-in segment drivers for a 3-1/2 digit LCD.
️· Backplane Frequency: Controlled by an external clock, divided by 800.
️· AC Drive: The AC drive configuration minimizes DC voltage across LCD segments, extending display life.
️· TEST Pin: When pulled high, all segments are turned on, displaying -1888. *Warning: Do not leave the display in this mode for extended periods, as it can damage the LCD.*
️· Digital Ground: Generated internally, stabilizes the circuit.

5. Key Features and Equations:

️· Equation 3-1: Vout = (Vin * TSI) / TRI (Relates input signal, reference voltage, and integration times)
️· Equation 3-2: Explains the normal mode rejection.
️· Equation 4-1: Defines the signal integration period.
️· Equation 4-2: D = (TRI / TSI) * 1000 (Expresses the digital reading)

Important Notes/Warnings:

️· LCD Drive: The "TEST" pin should only be used for brief testing. Leaving the LCD in this state for a long time can damage it.
️· Common Mode Range: Ensure the input voltage falls within the specified common mode range for optimal performance.
️· Integration Period: The length of the integration period can be influenced by several factors.

This summary should give you a clear understanding of the information contained within the document. Let me know if you have any other questions.