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LM12454 Datasheet(PDF) 1 Page - Texas Instruments

Part # LM12454
Description  LM12454/LM12458/LM12H458 12-Bit Sign Data Acquisition System with Self-Calibration
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM12454 Datasheet(HTML) 1 Page - Texas Instruments

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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.


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