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    LM12458

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    具有自校准功能的 12 位 + 数据采集系统]]

    制造商:TI

    产品信息

    描述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)Resolution12-bit + sign or 8-bit + sign 13-bit conversion time8.8 µs, 5.5 µs (H) (max) 9-bit conversion time4.2 µs, 2.6 µs (H) (max) 13-bit Through-put rate88k 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 rangeGND to VA+ Power Consumption30 mW, 34 mW (H) (max) Stand-by mode50 µW (typ) Single supply3V to 5.5V特性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

    电路图、引脚图和封装图

    在线购买

    型号制造商描述购买
    LM12458CIVTIIC ACQUISITION SYS 12BIT 44-PLCC 立即购买
    LM12458CIV/NOPBTIIC ACQUISITION SYS 12BIT 44-PLCC 立即购买
    LM12458CIVX/NOPBTIIC DATA AQUIS SYS 12BIT 44-PLCC 立即购买
     -- 立即购买

    技术资料

    标题类型大小(KB)下载
    Interfacing the LM12454/8 Data Acq Sys Chip to 80C51 Family of MicrocontrollersPDF615 点击下载
    Interfacing the LM12458 Data Acq Sys to the MC68HC11AX MicrocontrollerPDF317 点击下载
    Interface LM12454/8 Data Acq Sys Chips to Microprocessors & MicrocontrollersPDF598 点击下载

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