Datasheet > LM12L458_06

LM12L458_06

更新时间： 2024-09-24 04:20:19

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
29页	885K
描述
12-Bit + Sign Data Acquisition System with Self-Calibration

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LM12L458_06 数据手册

February 2006

LM12L458

12-Bit + Sign Data Acquisition System with

Self-Calibration

General Description

Key Specifications

The LM12L458 is a highly integrated 3.3V Data Acquisition

System. It combines a fully-differential self-calibrating (cor-

recting 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

LM12L458’s eight-input multiplexer. The LM12L458 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.

(f_CLK= 6 MHz)

n Resolution

n Single supply

12-bit + sign or 8-bit + sign

+3V to +5.5V

n 13-bit conversion time

n 9-bit conversion time

n 13-bit Through-put rate

n Comparison time (“watchdog” mode)

n ILE

7.3 µs

3.5 µs

106k samples/s (min)

1.8 µs (max)

1 LSB (max)

15 mW (max)

5 µW (typ)

n Power Consumption

n Stand-by mode

Features

n Three operating modes: 12-bit + sign, 8-bit + sign, and

“watchdog”

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 LM12L458 includes a direct

memory access (DMA) interface for high-speed conversion

data transfer.

n Single-ended or differential inputs

n Built-in Sample-and-Hold

n Instruction RAM and event sequencer

n 8-channel multiplexer

n 32-word conversion FIFO

Additional applications information can be found in applica-

tions notes AN-906, AN-947 and AN-949.

n Programmable acquisition times and conversion rates

n Self-calibration and diagnostic mode

n 8- or 16-bit wide data bus microprocessor or DSP

interface

n CMOS compatible I/O

Applications

n Data Logging

n Process Control

n Energy Management

n Medical Instrumentation

TRI-STATE^®is a registered trademark of National Semiconductor Corporation.

DS011711

www.national.com

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