LM12L458

LM12L458 www.ti.com SNAS085B – JULY 1999 – REVISED MARCH 2013 LM12L458 12-Bit + Sign Data Acquisition System with Self-Calibration Check for Samples: LM12L458 FEATURES 1 2 Three Operating Modes: 12-Bit + Sign, 8-Bit + Sign, and “Watchdog” Single-Ended or Differential Inputs Built-In Sample-and-Hold Instruction RAM and Event Sequencer 8-Channel Multiplexer 32-Word Conversion FIFO Programmable Acquisition Times and Conversion Rates Self-Calibration and Diagnostic Mode 8- or 16-Bit Wide Data Bus Microprocessor or DSP Interface CMOS Compatible I/O APPLICATIONS Data Logging Process Control Energy Management Medical Instrumentation KEY SPECIFICATIONS (fCLK = 6 MHz) Resolution: 12-Bit + Sign or 8-Bit + Sign Single Supply: +3 to +5.5 V 13-bit Conversion Time: 7.3 μs 9-bit Conversion Time: 3.5 μs 13-bit Through-Put Rate: 106 k Samples/s (Min) Comparison Time (“Watchdog” Mode): 1.8 μs (Max) ILE: ±1 LSB (Max) Power Consumption: 15 mW (max) Stand-By Mode: 5 μW (typ) DESCRIPTION The LM12L458 is a highly integrated 3.3V Data Acquisition System. It combines 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 complement format, can be stored in an internal 32-word (16-bit wide) FIFO data buffer. An internal 8-word RAM can store the...