TC500/A/510/514
Precision Analog Front Ends with Dual Slope ADC
Features: General Description: 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:
-В±4.2V (TC500A/TC510) Directly Accepts Bipolar and Differential
Input Signals TheTC500/A/510/514 family are precision analog front
ends that implement dual slope A/D converters having
a maximum resolution of 17 bits plus sign. As a
minimum, each device contains the integrator, zero
crossing comparator and processor interface logic. The
TC500 is the base (16-bit max) device and requires
both positive and negative power supplies. The
TC500A is identical to the TC500 with the exception
that it has improved linearity, allowing it to operate to a
maximum resolution of 17 bits. The TC510 adds an onboard negative power supply converter for singlesupply operation. The TC514 adds both a negative
power supply converter and a 4-input differential
analog multiplexer. Applications: Precision Analog Signal Processor Precision Sensor Interface High Accuracy DC Measurements Each device has the same processor control interface
consisting of 3 wires: control inputs (A and B) and zerocrossing comparator output (CMPTR). The processor
manipulates A, B to sequence the TC5XX through four
phases of conversion: auto-zero, integrate, deintegrate and integrator zero. During the auto-zero …