 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LM12454 Datasheet(PDF) 1 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
LM12454 Datasheet(HTML) 1 Page - Texas Instruments |
|
|
1 / 45 page  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 1 FEATURES • Self-calibration and diagnostic mode • 8- or 16-bit wide data bus microprocessor or 23 • Three operating modes: 12-bit + sign, 8-bit + DSP interface sign, and “watchdog” • Single-ended or differential inputs APPLICATIONS • Built-in Sample-and-Hold and 2.5V bandgap • Data Logging reference • Instrumentation • Instruction RAM and event sequencer • Process Control • 8-channel multiplexer • Energy Management • 32-word conversion FIFO • Inertial Guidance • Programmable acquisition times and conversion rates 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) 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 obsolete LM12454 has a four-channel multiplexer, a differential multiplexer output, and a differential S/H input. The 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 data bus. The LM12(H)458 includes a direct memory access (DMA) interface for high-speed conversion data transfer. Additional applications information can be found in applications notes AN-906, AN-947 and AN-949. Table 1. Key Specifications VALUE UNIT (fCLK = 5 MHz; 8 MHz, H) ■ 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) 88k samples/s (min) ■ 13-bit Through-put rate 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 Consumption 30 mW, 34 mW (H) (max) ■ Stand-by mode 50 μW (typ) ■ Single supply 3 to 5.5 V 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 TRI-STATE is a registered trademark of Texas Instruments. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2006, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
Similar Part No. - LM12454_14 |
|
Similar Description - LM12454_14 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
