LM12L458 Datasheet | National Semiconductor

Description The LM12L458 is a highly integrated 3.3V Data Acquisition System. It bines a fully-differential self-calibrating (correcting linearity and zero errors) 13-bit (12-bit + sign) analog-to-digital converter (ADC) and sample-and-hold (S/H) with extensive analog functions and digital functionality. Up to 32 consecutive conversions, using two’s plement format, can be stored in an internal 32-word (16-bit wide) FIFO data buffer. An internal 8-word RAM can store the conversion sequence for up to eight acquisitions through the LM12L458’s eight-input multiplexer. The LM12L458 can also operate with 8-bit + sign resolution and in a supervisory “watchdog” mode that pares an input signal against two programmable limits. Programmable acquisition times and conversion rates are possible through the use of internal clock-driven timers. All registers, RAM, and FIFO are directly addressable through the high speed microprocessor interface to either an 8-bit or 16-bit databus. The LM12L458 includes a direct memory access (DMA) interface for high-speed conversion data transfer. Key Specifications (f CLK = 6 MHz) n Resolution 12-bit + sign or 8-bit + sign n 13-bit conversion time 7.3 µs n 9-bit conversion time 3.5 µs n 13-bit Through-put rate 106k samples/s (min) n parison time (“watchdog” mode) 1.8 µs (max) ± 1 LSB (max) n ILE n VIN range GND to VA+ n Power dissipation 15 m W (max) n Stand-by mode 5 µW (typ) n Single supply 3V to 5.5V Features n Three operating modes: 12-bit + sign, 8-bit + sign, and “watchdog” n Single-ended or differential inputs n Built-in Sample-and-Hold n Instruction RAM and event sequencer n 8-channel multiplexer n 32-word conversion FIFO n Programmable acquisition times and conversion rates n Self-calibration and diagnostic mode n 8- or 16-bit wide databus microprocessor or DSP interface n CMOS patible I/O Applications n n n n Data Logging Process Control Energy Management Medical Instrumentation TRI-STATE ® is a registered trademark of National...