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LM12434

更新时间： 2024-11-22 22:51:59
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美国国家半导体 - NSC /
页数 文件大小 规格书
80页 1551K
描述
Sign Data Acquisition System with Serial I/O and Self-Calibration

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LM12434 数据手册

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July 1995  
À Ó  
LM12434/LM12 L 438 12-Bit  
a
Sign Data Acquisition  
System with Serial I/O and Self-Calibration  
General Description  
The LM12434 and LM12 L 438 are highly integrated Data  
Acquisition Systems. Operating on 3V to 5V, they combine a  
fully-differential self-calibrating (correcting linearity and zero  
Key Specifications  
f
e
Resolution  
À
8 MHz L, f  
e
CLK  
Ó
6 MHz  
12-bit  
À
Ó
CLK  
Y
Y
Y
Y
a
a
Ó
Ó
sign or 8-bit  
À
sign  
13-bit conversion time  
9-bit conversion time  
13-bit Through-put rate  
5.5 ms 7.3 ms (max)  
2.6 ms 3.5 ms (max)  
À
a
errors) 13-bit (12-bit  
sign) analog-to-digital converter  
(ADC) and sample-and-hold (S/H) with extensive analog  
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  
instruction RAM can store the conversion sequence for up  
to eight acquisitions through the LM12 L 438’s eight-input  
multiplexer. The LM12434 has a four-channel multiplexer, a  
differential multiplexer output, and a differential S/H input.  
À
Ó
140k samples/s 105k sample/s (min)  
Comparison time (‘‘watchdog’’ mode)  
1.4 ms 1.8 ms (max)  
Y
À
Ó
Y
Y
Y
Y
Y
À Ó  
Serial Clock  
Integral Linearity Error  
10 MHz 6 MHz (max)  
g
1 LSB (max)  
a
À
Ó
V
IN  
range  
GND to V  
A
À Ó  
45 mW 20 mW (max)  
Power dissipation  
Stand-by mode  
À
Ó
The LM12434 and LM12 L 438 can also operate with 8-bit  
sign resolution and in a supervisory ‘‘watchdog’’ mode  
À Ó  
25 mW 16.5 mW (typ)  
power dissipation  
Supply voltage LM12L438  
LM12434/8  
a
Y
g
3.3V 10%  
that compares an input signal against two programmable  
limits.  
g
5V 10%  
Features  
Three operating modes: 12-bit  
Acquisition times and conversion rates are programmable  
through the use of internal clock-driven timers. The differen-  
tial reference voltage inputs can be externally driven for ab-  
solute or ratiometric operation.  
Y
a
a
sign,  
sign, 8-bit  
and ‘‘watchdog’’ comparison mode  
Single-ended or differential inputs  
Built-in Sample-and-Hold  
Y
Y
Y
Y
All registers, RAM, and FIFO are directly accessible through  
the high speed and flexible serial I/O interface bus. The  
serial interface bus is user selectable to interface with the  
following protocols with zero glue logic: MICROWIRE/  
PLUSTM, Motorola’s SPI/QSPI, Hitachi’s SCI, 8051 Family’s  
2
Serial Port (Mode 0), I C and the TMS320 Family’s Serial  
Port.  
Instruction RAM and event sequencer  
Ó
À
8-channel (LM12 L 438) or 4-channel (LM12434)  
multiplexer  
32-word conversion FIFO  
Y
Y
Y
Y
Y
Programmable acquisition times and conversion rates  
Self-calibration and diagnostic mode  
Power down output for system power management  
Read while convert capability for maximum through-put  
rate  
An evaluation kit for demonstrating the LM12434 and  
À
Ó
LM12 L 438 is available.  
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.  
MICROWIRE/PLUSTM is a trademark of National Semiconductor Corporation.  
WindowsÉ is a registered trademark of Microsoft Corporation.  
Applications  
Data Logging  
Y
Y
Portable Instrumentation  
Process Control  
Y
Y
Energy Management  
Robotics  
Y
Connection Diagrams  
28-Pin PLCC Package  
28-Pin Wide Body SO Package  
TL/H/11879–1  
TL/H/11879–2  
Order Number LM12434CIWM, LM12438CIWM, or  
LM12L438CIWM  
See NS Package Number M28B  
*Pin names in ( ) apply to the LM12434  
Order Number LM12434CIV, LM12438CIV, or  
LM12L438CIV  
See NS Package Number V28A  
C
1995 National Semiconductor Corporation  
TL/H/11879  
RRD-B30M85/Printed in U. S. A.  
1234567...80

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