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LM12L438CIWM データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM12L438CIWM データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 80 page TLH11879 July 1995 LM12434LM12 L 438 12-Bit a Sign Data Acquisition System with Serial IO and Self-Calibration General Description The LM12434 and LM12 L 438 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 (SH) with extensive analog 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 instruction RAM can store the conversion sequence for up to eight acquisitions through the LM12 L 438’s eight-input multiplexer The LM12434 has a four-channel multiplexer a differential multiplexer output and a differential SH input The LM12434 and LM12 L 438 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 IO interface bus The serial interface bus is user selectable to interface with the following protocols with zero glue logic MICROWIRE PLUSTM Motorola’s SPIQSPI Hitachi’s SCI 8051 Family’s Serial Port (Mode 0) I2C and the TMS320 Family’s Serial Port An evaluation kit for demonstrating the LM12434 and LM12 L 438 is available TRI-STATE is a registered trademark of National Semiconductor Corporation MICROWIREPLUSTM is a trademark of National Semiconductor Corporation Windows is a registered trademark of Microsoft Corporation Key Specifications fCLK e 8 MHz L fCLK e 6 MHz Y Resolution 12-bit a sign or 8-bit a sign Y 13-bit conversion time 55 ms 73 ms (max) Y 9-bit conversion time 26 ms 35 ms (max) Y 13-bit Through-put rate 140k sampless 105k samples (min) Y Comparison time (‘‘watchdog’’ mode) 14 ms 18 ms (max) Y Serial Clock 10 MHz 6 MHz (max) Y Integral Linearity Error g 1 LSB (max) Y VIN range GND to VAa Y Power dissipation 45 mW 20 mW (max) Y Stand-by mode power dissipation 25 mW 165 mW (typ) Y Supply voltage LM12L438 33V g10% LM124348 5V g10% Features Y Three operating modes 12-bit a sign 8-bit a sign and ‘‘watchdog’’ comparison mode Y Single-ended or differential inputs Y Built-in Sample-and-Hold Y Instruction RAM and event sequencer Y 8-channel (LM12 L 438) or 4-channel (LM12434) multiplexer Y 32-word conversion FIFO Y Programmable acquisition times and conversion rates Y Self-calibration and diagnostic mode Y Power down output for system power management Y Read while convert capability for maximum through-put rate Applications Y Data Logging Y Portable Instrumentation Y Process Control Y Energy Management Y Robotics Connection Diagrams 28-Pin PLCC Package TLH11879 – 1 Pin names in ( ) apply to the LM12434 Order Number LM12434CIV LM12438CIV or LM12L438CIV See NS Package Number V28A 28-Pin Wide Body SO Package TLH11879 – 2 Order Number LM12434CIWM LM12438CIWM or LM12L438CIWM See NS Package Number M28B C1995 National Semiconductor Corporation RRD-B30M85Printed in U S A |
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