Sign Data Acquisition System With Serial I/o And Self-calibration

The LM12434 and LM12L438 are highly integrated Data Acquisition Systems. Operating on 3V to 5V, they combine a fully-differential self-calibrating (correcting linearity and zero errors) 13-bit (12-bit a sign) Analog-to-digital converter (ADC) and sample-and-hold (S/H) with extensive Analog and digital functionality. Up to 32 consecutive conversions, using twos complement format, CAN be stored in an internal 32-word (16-bit wide) FIFO data Buffer An internal 8-word instruction RAM CAN store the conversion sequence for up to eight acquisitions through the LM12L438s eight-input multiplexer. The LM12434 has a four-channel multiplexer, a differential multiplexer output, and a differential S/H input. The LM12434 and LM12L438 CAN also operate with 8-bit a sign resolution and in a supervisory watchdog mode that compares an input signal against two programmable limits. Acquisition times and conversion rates are programmable through the use of internal clock-driven Timers The differen- tial reference voltage inputs CAN be externally driven for ab- solute or ratiometric operation. All Registers RAM, and FIFO are directly accessible through the high speed and flexible serial I/O Interface bus. The serial Interface bus is user selectable to Interface with the following protocols with zero glue logic: MICROWIRE/ PLUSTM, Motorolas SPI/QSPI, Hitachis SCI, 8051 Familys Serial Port (Mode 0), I2C and the TMS320 Familys Serial Port. By National Semiconductor Corporation
LM12434 's PackagesLM12434 's pdf datasheet

LM12434 Pinout, Pinouts
LM12434 pinout,Pin out
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