LM12454CIV

Product Summary

The LM12454CIV is a highly integrated Data Acquisition System. Operating on just 5V, 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. The LM12454CIV has a four-channel multiplexer, a differential multiplexer output, and a differential S/H input. The LM12454CIV can also operate with 8-bit + sign resolution and in a supervisory “watchdog” mode that compares an input signal against two programmable limits. Programmable acquisition times and conversion rates are possible through the use of internal clock-driven timers. The reference voltage input can be externally generated for absolute or ratiometric operation or can be derived using the internal 2.5V bandgap reference. All registers, RAM, and FIFO are directly addressable through the high speed microprocessor interface to either an 8-bit or 16-bit databus. The LM12454CIV includes a direct memory access (DMA) interface for high-speed conversion data transfer.

Parametrics

LM12454CIV absolute maximum ratings: (1)Supply Voltage (VA+ and VD+): 6.0V; (2)Voltage at Input and Output Pins except IN0–IN3: -0.3V to V+ + 0.3V; (3)Voltage at Analog Inputs IN0–IN3: -5V to V+ + 5V; (4)|VA+ - VD+|: 300 mV; (5)Input Current at Any Pin: ±5 mA; (6)Package Input Current: ±20 mA; (7)Power Dissipation (TA = 25℃) V Package: 875 mW; (8)Storage Temperature: -65℃ to +150℃; (9)Lead Temperature V Package, Infrared, 15 sec.: +300℃; (10)EL and W Packages, Solder, 10 sec.: +250℃.

Features

LM12454CIV features: (1)Three operating modes: 12-bit + sign, 8-bit + sign, and “watchdog”; (2)Single-ended or differential inputs; (3)Built-in Sample-and-Hold and 2.5V bandgap reference; (4)Instruction RAM and event sequencer; (5)4-channel multiplexer; (6)32-word conversion FIFO; (7)Programmable acquisition times and conversion rates; (8)Self-calibration and diagnostic mode; (9)8- or 16-bit wide databus dmicroprocessor or DSP interface.

Diagrams