LM12458
Sistema de adquisición de datos de signos Plus de 12 bits y 88 kSPS con autocalibración
LM12458
- 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 multiplexer
- 32-word conversion FIFO
- Programmable acquisition times and conversion rates
- Self-calibration and diagnostic mode
- 8- or 16-bit wide data bus microprocessor or DSP interface
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.
Key Specifications
(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) |
13-bit Through-put rate | 88k samples/s (min),140k samples/s (H) (min) |
Comparison time ("watchdog" mode) | 2.2 µs (max),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 | 3V to 5.5V |
Documentación técnica
Tipo | Título | Fecha | ||
---|---|---|---|---|
* | Data sheet | LM12454/LM12458/LM12H458 12-Bit + Sign Data Acq System w/Self-Calibration datasheet (Rev. A) | 16 feb 2006 | |
E-book | Best of Baker's Best: Precision Data Converters -- SAR ADCs | 21 may 2015 | ||
Application note | Interface LM12454/8 Data Acq Sys Chips to Microprocessors & Microcontrollers | 14 may 2004 | ||
Application note | Interfacing the LM12458 Data Acq Sys to the MC68HC11AX Microcontroller | 14 may 2004 | ||
Application note | Interfacing the LM12454/8 Data Acq Sys Chip to 80C51 Family of Microcontrollers | 14 may 2004 |
Diseño y desarrollo
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ANALOG-ENGINEER-CALC — Calculadora para ingenieros analógicos
PSPICE-FOR-TI — PSpice® para herramienta de diseño y simulación de TI
TINA-TI — Programa de simulación analógica basado en SPICE
Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
---|---|---|
PLCC (FN) | 44 | Ultra Librarian |
Pedidos y calidad
- RoHS
- REACH
- Marcado del dispositivo
- Acabado de plomo/material de la bola
- Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
- Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
- Contenido del material
- Resumen de calificaciones
- Monitoreo continuo de confiabilidad
- Lugar de fabricación
- Lugar de ensamblaje
Soporte y capacitación
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