LM12458

LM12454, LM12458, LM12H458 www.ti.com SNAS079A – MAY 2004 – REVISED FEBRUARY 2006 LM12454/LM12458/LM12H458 12-Bit + Sign Data Acquisition System with Self-Calibration Check for Samples: LM12454, LM12458, LM12H458 FEATURES 1 23 Three operating modes: 12-bit + sign, 8-bit + sign, and “watchdog” Single-ended or differential inputs Built-in Sample-and-Hold and 2.5V bandgap reference 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 APPLICATIONS Data Logging Instrumentation Process Control Energy Management Inertial Guidance KEY SPECIFICATIONS Resolution: 12-bit + sign or 8-bit + sign 13-bit conversion time: 8.8 μs, 5.5 μs (H) (max) 9-bit conversion time: 4.2 μs, 2.6 μs (H) (max) 13-bit Through-put rate: – 88k samples/s (min) – 140k samples/s (H) (min) Comparison time: 2.2 μs (max) – ("watchdog” mode): 1.4 μs (H) (max) ILE: ±1 LSB (max) VIN range: GND to VA + Power dissipation: 30 mW, 34 mW (H) (max) Stand-by mode: 50 μW (typ) Single supply: 3V to 5.5V DESCRIPTION The LM12458, and LM12H458 are highly integrated Data Acquisition Systems. Operating on just 5V, they combine a fully-differential self-calibrating (correcting linearity and zero errors) 13-bit (12-bit + sign) analogto-digital converter (ADC) and sample-and-hold (S/H) with extensive analog func...