Features: `Three operating modes: 12-bit + sign, 8-bit + sign, and "watchdog"
`Single-ended or differential inputs
`Built-in Sample-and-Hold and 2.5V bandgap reference
`Instruction RAM and event sequencer
`8-channel (LM12(H)458), 4-channel (LM12454) multiplexer
`32-word conversion FIFO
`Programmable acquisition times and conversion rates
`Self-calibration and diagnostic mode
`8- or 16-bit wide databus dmicroprocessor or DSP interface
Application·Data Logging
·Instrumentation
·Process Control
·Energy Management
·Inertial GuidancePinout
SpecificationsSupply Voltage (VA+ and VD+) 6.0V
Voltage at Input and Output Pins
except IN0IN3 (LM12454) -0.3V to V+ + 0.3V
and IN0IN7 (LM12(H)458)
Voltage at Analog Inputs IN0IN3 (LM12454)
and IN0IN7 (LM12(H)458) GND - 5V to V+ + 5V
|VA+ - VD+| 300 mV
Input Current at Any Pin (Note 3) ±5 mA
Package Input Current (Note 3) ±20 mA
Power Dissipation (TA = 25)
V Package (Note 4) 875 mW
Storage Temperature -65 to +150
Lead Temperature
V Package, Infrared, 15 sec.+300
EL and W Packages,
Solder, 10 sec. +250
ESD Susceptibility (Note 5) 1.5 kV
LM12458MEL/883 2.0 kV
| Resolution |
12 bits |
| Input Channels |
8 |
| Interface Type |
Parallel |
| Differential Input |
Yes |
| INL (LSB) |
+/-1.0 |
| Max KSample Rate |
182 ksps |
| Min Supply Voltage |
3 Volt |
| Max Supply Voltage |
5.5 Volt |
| Reference Source |
Internal |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| Power Down |
Yes |
| Input Sample/Hold |
Yes |
| Special Features |
Undefined |
| Data Converter Type |
ADC |
| Max Sample Rate |
0.182 MSPS |
| View Using Catalog |
DescriptionThe 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.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM12H458CIV |
CS150 |
1 |
13275 |
76 |
0 |
932500 |
4 |
264599421 |
| LM12H458CIVF |
CS150 |
1 |
13275 |
76 |
0 |
932500 |
4 |
264599421 |
Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.For more information on Reliability Metrics, please click here.
Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-906: Interfacing the LM12454/8 Data Acquisition System Chips to Microprocessors and Microcontrollers |
561 Kbytes |
5-Aug-95 |
Download |
AN-906 (Japanese): Interfacing the LM12454/8 Data Acquisition System Chips to Microprocessors and Microcontrollers
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880 Kbytes |
|
|
| AN-949: Interfacing the LM12454/8 Data Acquisition System Chips to the 80C51 Family of Microcontrollers |
579 Kbytes |
5-Aug-95 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
More Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-947: Interfacing the LM12458 Data Acquisition System to the MC68HC11AX Microcontroller |
279 Kbytes |
5-Aug-95 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
LM12H458 Data Sheet
