Features:

• Precision (up to 17 bits) A/D Converter “Front End”

• 3-Pin Control Interface to Microprocessor

• Flexible: User Can Trade-off Conversion Speed for Resolution

• Single-Supply Operation (TC510/TC514)

• 4 Input, Differential Analog MUX (TC514)

• Automatic Input Voltage Polarity Detection

• Low Power Dissipation:- (TC500/TC500A): 10 mW- (TC510/TC514): 18 mW

• Wide Analog Input Range:- ±4.2V (TC500A/TC510)

• Directly Accepts Bipolar and Differential Input Signals

Applications:

• Precision Analog Signal Processor

• Precision Sensor Interface

• High Accuracy DC Measurements

General Description:

TheTC500/A/510/514 family are precision analog frontends that implement dual slope A/D converters havinga maximum resolution of 17 bits plus sign. As aminimum, each device contains the integrator, zerocrossing comparator and processor interface logic. TheTC500 is the base (16-bit max) device and requiresboth positive and negative power supplies. TheTC500A is identical to the TC500 with the exceptionthat it has improved linearity, allowing it to operate to amaximum resolution of 17 bits. The TC510 adds an on-board negative power supply converter for single-supply operation. The TC514 adds both a negativepower supply converter and a 4-input differentialanalog multiplexer

Each device has the same processor control interfaceconsisting of 3 wires: control inputs (A and B) and zero-crossing comparator output (CMPTR). The processormanipulates A, B to sequence the TC5XX through fourphases of conversion: auto-zero, integrate, de-integrate and integrator zero. During the auto-zerophase, offset voltages in the TC5XX are corrected by aclosed loop feedback mechanism. The input voltage isapplied to the integrator during the integrate phase.This causes an integrator output dv/dt directlyproportional to the magnitude of the input voltage. Thehigher the input voltage, the greater the magnitude ofthe voltage stored on the integrator during this phase.At the start of the de-integrate phase, an externalvoltage reference is applied to the integrator and, at thesame time, the external host processor starts its on-board timer. The processor maintains this state until atransition occurs on the CMPTR output, at which timethe processor halts its timer. The resulting timer countis the converted analog data. Integrator zero (the finalphase of conversion) removes any residue remainingin the integrator in preparation for the next conversion.The TC500/A/510/514 offer high resolution (up to17 bits), superior 50/60 Hz noise rejection, low-poweroperation, minimum I/O connections, low input biascurrents and lower cost compared to other convertertechnologies having similar conversion speeds.

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