描述 The TLC545 and TLC546 are CMOS analog-to-digital converters built around an 8-bit switched capacitor successive-approximation analog-to-digital converter. They are designed for serial interface to a microprocessor or peripheral via a 3-state output with up to four control inputs including independent SYSTEM CLOCK, I/O CLOCK, chip select (CS\), and ADDRESS INPUT. A 4-MHz system clock for the TLC545 and a 2.1-MHz system clock for the TLC546 with a design that includes simultaneous read/write operation allowing high-speed data transfers and sample rates of up to 76,923 samples per second for the TLC545, and 40,000 samples per second for the TLC546.In addition to the high-speed converter and versatile control logic, there is an on-chip 20-channel analog multiplexer that can be used to sample any one of 19 inputs or an internal self-test voltage, and a sample-and-hold that can operate automatically or under microprocessor control. The converters incorporated in the TLC545 and TLC546 feature differential high-impedance reference inputs that facilitate ratiometric conversion, scaling, and analog circuitry isolation from logic and supply noises. A totally switched capacitor design allows low-error (±0.5 LSB) conversion in 9 us for the TLC545, and 17 us for the TLC546, over the full operating temperature range. The TLC545C and the TLC546C are characterized for operation from 0°C to 70°C. The TLC545I and the TLC546I are characterized for operation from -40°C to 85°C.特性 8-Bit Resolution A/D Converter Microprocessor Peripheral or Stand-Alone Operation On-Chip 20-Channel Analog Multiplexer Built-in Self-Test Mode Software-Controllable Sample and Hold Total Unadjusted Error . . . ±0.5 LSB Max Timing and Control Signals Compatible With 8-Bit TLC540 and 10-Bit TLC1540 A/D Converter Families CMOS Technology