LM12458CIV ,12-Bit Plus Sign Data Acquisition System with Self-CalibrationLM12454/LM12458/LM12H45812-Bit + Sign Data Acquisition System with Self-CalibrationJuly 1999LM12454 ..
LM12458CIV/NOPB ,12-Bit Plus Sign Data Acquisition System with Self-Calibration 44-PLCC -40 to 85FEATURESDESCRIPTION23• Three operating modes: 12-bit + sign, 8-bit +The LM12458, and LM12H458 are h ..
LM12458CIVF ,12-Bit Plus Sign Data Acquisition System with Self-Calibrationapplications information can be found in applica-n 8- or 16-bit wide databus dmicroprocessor or DSP ..
LM1246 ,150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACsApplicationsmodesn Internal 512 character OSD ROM usable as either (a) n Low end 15" and 17" bus co ..
LM1246AAC/NA ,150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACsGeneral Descriptionn OSD Half Tone TransparencyThe LM1246 pre-amp is an integrated CMOS CRT preamp. ..
LM1247 ,150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs [Life-time buy]Electrical CharacteristicsUnless otherwise noted: T = 25˚C, V = +5.0V, V = 0.70 V ,V =V ,C = 8 pF, ..
LM3880MF-1AB/NOPB ,Simple Power Sequencer with Fixed Time Delay 6-SOT-23 -40 to 125Maximum Ratings... 5• Removed “Customized Timing and Sequence” section ... 13Changes from Revision ..
LM3880MF-1AE , Power Sequencer
LM3880QMF-1AE , Power Sequencer
LM3886 ,High-Performance 68W Audio Power Amplifier with MuteFEATURES DESCRIPTIONThe LM3886 is a high-performance audio power23• 68W Cont. Avg. Output Power int ..
LM3886 ,High-Performance 68W Audio Power Amplifier with MuteElectrical Characteristics+−The following specifications apply for V = +28V, V =−28V, I =−0.5 mA wi ..
LM3886T ,High-Performance 68W Audio Power Amplifier with MuteGeneral Descriptionn Signal-to-Noise Ratio ≥ 92dBThe LM3886 is a high-performance audio power ampli ..
LM12454CIV-LM12458CIV-LM12458CIVF-LM12H458CIV-LM12H458CIVF
12-Bit Plus Sign Data Acquisition System with Self-Calibration
LM12454/LM12458/LM12H458
12-Bit+ Sign Data Acquisition System with
Self-Calibration
General DescriptionThe LM12454, LM12458, and LM12H458are highly inte-
grated Data Acquisition Systems. Operatingonjust5V, they
combinea fully-differential self-calibrating (correcting linear-
ity and zero errors) 13-bit (12-bit+ sign) analog-to-digital
converter (ADC) and sample-and-hold (S/H) with extensive
analog functionsand digital functionality.Upto32 consecu-
tive conversions, using two’s complement format, canbe
storedinan internal 32-word (16-bit wide) FIFO data buffer. internal 8-word RAMcan storethe conversion sequence
forupto eight acquisitions throughthe LM12(H)458’s
eight-input multiplexer. The LM12454 hasa four-channel
multiplexer,a differential multiplexer output, anda differential
S/H input.The LM12454and LM12(H)458can also operate
with 8-bit+ sign resolutionandina supervisory “watchdog”
modethat comparesan input signal againsttwo program-
mable limits.
Programmable acquisition times and conversion ratesare
possible throughtheuseof internal clock-driven timers.The
reference voltage inputcanbe externally generatedforab-
soluteor ratiometric operationorcanbe derived using thein-
ternal 2.5V bandgap reference.
All registers, RAM, and FIFO are directly addressable
through thehighspeed microprocessor interfaceto eitheran
8-bitor 16-bit databus. The LM12454 and LM12(H)458in-
cludea direct memory access (DMA) interface for
high-speed conversion data transfer.
evaluation/interface boardis available. Order num-
ber LM12458EVAL.Additional applications informationcanbe foundin applica-
tions notes AN-906, AN-947and AN-949.
Key Specifications(fCLK=5 MHz;8 MHz,H) Resolution 12-bit+ signor 8-bit+ sign 13-bit conversion time 8.8μs,5.5μs(H) (max) 9-bit conversion time 4.2μs,2.6μs(H) (max) 13-bit Through-put rate 88k samples/s (min),
140k samples/s(H) (min) Comparison time
(“watchdog” mode)
2.2μs (max),
1.4μs(H) (max) ILE ±1 LSB (max) VIN range GNDtoVA+ Power dissipation 30 mW,34mW(H) (max) Stand-by mode 50μW (typ) Single supply 3Vto 5.5V
Features Three operating modes: 12-bit+ sign, 8-bit+ sign,and
“watchdog” Single-endedor differential inputs Built-in Sample-and-Holdand 2.5V bandgap reference Instruction RAMand event sequencer 8-channel (LM12(H)458), 4-channel (LM12454)
multiplexer 32-word conversion FIFO Programmable acquisition timesand conversion rates Self-calibrationand diagnostic mode8-or 16-bit wide databus dmicroprocessoror DSP
interface
Applications Data Logging Instrumentation Process Control Energy Management Inertial Guidance
TRI-STATE®isa registeredtrademark ofNationalSemiconductorCorporation.
AT®isa registeredtrademarkof InternationalBusiness Machines Corporation.
July 1999
LM12454/LM12458/LM12H458
12-Bit
Sign
Data
Acquisition
System
with
Self-Calibration©1999 National Semiconductor Corporation DS011264
