TLC533AI

The TLC533AI are monolithic LinCMOSE peripheral integrated circuits each designed to interface a microprocessor for analog data acquisition. These TLC533AI are complete peripheral data acquisition systems on a single chip and can convert analog signals to digital data from up to 11 external analog terminals. Each device operates from a single 5-V supply and contains a 12-channel analog multiplexer, and 8-bit ratiometric analog-to-digital (A/D) converter, a sample-and-hold circuit, three 16-bit registers, and microprocessor-compatible control circuitry. Additional features include a built-in self-test, sixmultipurpose (analog or digital) inputs, five external analog inputs, and an 8-pin input/output (I/O) data port. The three on-chip data registers store the control data, the conversion results, and the input digital data that can be accessed via the microprocessor data bus in two bytes(most-significant byte first). In this manner, a microprocessor TLC533AI can access up to 11 external analog inputs or 6 digital signals and the positive reference voltage that may be used for self-test. The A/D conversion uses the successive-approximation technique and switched-capacitor circuitry. This method eliminates the possibility of missing codes, nonmonotonicity, and a need for zero or full-scale adjustment. Any one of 11 analog inputs (or self-test) can be converted to an 8-bit digital word and stored within 10 ms for the TLC532A or 20 ms for theTLC533A after instructions from the microprocessor are recognized. The on-chip sample-and-hold circuit automatically minimizes errors due to noise on the analog inputs. Furthermore, differential high-impedance reference inputs are available to help isolate the analog circuitry from the logic and supply noises while easing ratiometric conversion and scaling.

The TLC532AI and TLC533AI are characterized for operation from 40°C to 85°C. The TLC532AM and TLC533AM are available in both the N and FN plastic packages and are characterized for operation from 55°C to 125°C.