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Details, datasheet, quote on part number:LM12454CIV
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| Part: | LM12454CIV |
| Category: | Data Conversion => ADC (Analog to Digital Converters) |
| Description: | LM12454 - 12-Bit Plus Sign Data Acquisition System With Self-Calibration, Package: Plcc, Pin Nb=44 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM12454CIV datasheet File size : 1016 kB |
| Request For quote: | Find where to buy LM12454CIV
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Datasheet text preview:
LM12454/LM12458/LM12H458 12-Bit + Sign Data Acquisition System with Self-Calibration
July 1999
LM12454/LM12458/LM12H458 12-Bit + Sign Data Acquisition System with Self-Calibration
General Description
The LM12454, 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) 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 conversion sequence for up to eight acquisitions through the LM12(H)458's eight-input multiplexer. The LM12454 has a four-channel multiplexer, a differential multiplexer output, and a differential S/H input. The LM12454 and LM12(H)458 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 LM12454 and LM12(H)458 include a direct memory access (DMA) interface for high-speed conversion data transfer. An evaluation/interface board is available. Order number LM12458EVAL. Additional applications information can be found in applications notes AN-906, AN-947 and AN-949.
Key Specifications
(fCLK = 5 MHz; 8 MHz, H)
j j j j j j j j j j
Resolution 13-bit conversion time 9-bit conversion time 13-bit Through-put rate Comparison time ("watchdog" mode) ILE VIN range Power dissipation Stand-by mode Single supply
12-bit + sign or 8-bit + sign 8.8 µs, 5.5 µs (H) (max) 4.2 µs, 2.6 µs (H) (max) 88k samples/s (min), 140k samples/s (H) (min) 2.2 µs (max), 1.4 µs (H) (max)
± 1 LSB (max)
GND to VA+ 30 mW, 34 mW (H) (max) 50 µW (typ) 3V to 5.5V
Features
n Three operating modes: 12-bit + sign, 8-bit + sign, and "watchdog" n Single-ended or differential inputs n Built-in Sample-and-Hold and 2.5V bandgap reference n Instruction RAM and event sequencer n 8-channel (LM12(H)458), 4-channel (LM12454) multiplexer n 32-word conversion FIFO n Programmable acquisition times and conversion rates n Self-calibration and diagnostic mode n 8- or 16-bit wide databus dmicroprocessor or DSP interface
Applications
n n n n n Data Logging Instrumentation Process Control Energy Management Inertial Guidance
TRI-STATE ® is a registered trademark of National Semiconductor Corporation. AT ® is a registered trademark of International Business Machines Corporation.
© 1999 National Semiconductor Corporation
DS011264
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Ordering Information
Guaranteed Clock Freq (min) 8 MHz Guaranteed Linearity Error (max) Order Part Number LM12H458CIV LM12H458CIVF LM12H458MEL/883 or 5962-9319502MYA 5 MHz See NS Package Number V44A VGZ44A EL44A V44A V44A VGZ44A
± 1.0 LSB
± 1.0 LSB
LM12454CIV LM12458CIV LM12458CIVF
Connection Diagrams
DS011264-34
Order Number LM12458CIVF or LM12H458CIVF See NS Package Number VGZ44A
DS011264-2
* Pin names in ( ) apply to the LM12454 and LM12H454.
Order Number LM12454CIV, LM12458CIV or LM12H458CIV See NS Package Number V44A Order Number LM12H458MEL/883 or 5962-9319502MYA See NS Package Number EL44A
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Functional Diagrams
LM12454
DS011264-1
LM12(H)458
DS011264-21
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