參數(shù)資料
型號(hào)： LM12434
廠商： National Semiconductor Corporation
英文描述： Sign Data Acquisition System with Serial I/O and Self-Calibration
中文描述： 注冊(cè)數(shù)據(jù)采集系統(tǒng)的串行I / O和自校準(zhǔn)
文件頁(yè)數(shù)： 1/80頁(yè)
文件大?。?/td> 1561K
代理商： LM12434
TL/H/11879
L
à
L
ó
4
a
S
w
July 1995
LM12434/LM12
à
L
ó
438 12-Bit
a
Sign Data Acquisition
System with Serial I/O and Self-Calibration
General Description
The LM12434 and LM12
à
L
ó
438 are highly integrated Data
Acquisition Systems. Operating on 3V to 5V, they combine a
fully-differential self-calibrating (correcting linearity and zero
errors) 13-bit (12-bit
a
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
à
L
ó
438’s eight-input
multiplexer. The LM12434 has a four-channel multiplexer, a
differential multiplexer output, and a differential S/H input.
The LM12434 and LM12
à
L
ó
438 can also operate with 8-bit
a
sign resolution and in a supervisory ‘‘watchdog’’ mode
that compares an input signal against two programmable
limits.
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.
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/
PLUS
TM
, Motorola’s SPI/QSPI, Hitachi’s SCI, 8051 Family’s
Serial Port (Mode 0), I
2
C and the TMS320 Family’s Serial
Port.
An evaluation kit for demonstrating the LM12434 and
LM12
à
L
ó
438 is available.
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
MICROWIRE/PLUS
TM
is a trademark of National Semiconductor Corporation.
Windows
é
is a registered trademark of Microsoft Corporation.
Key Specifications
f
CLK
e
8 MHz
à
L, f
CLK
e
6 MHz
ó
Y
Resolution
Y
13-bit conversion time
Y
9-bit conversion time
Y
13-bit Through-put rate
12-bit
a
sign or 8-bit
a
sign
5.5
m
s
à
7.3
m
s
ó
(max)
2.6
m
s
à
3.5
m
s
ó
(max)
140k samples/s
à
105k sample/s
ó
(min)
Y
Comparison time (‘‘watchdog’’ mode)
1.4
m
s
à
1.8
m
s
ó
(max)
10 MHz
à
6 MHz
ó
(max)
g
1 LSB (max)
GND to V
A
a
45 mW
à
20 mW
ó
(max)
Y
Serial Clock
Y
Integral Linearity Error
Y
V
IN
range
Y
Power dissipation
Y
Stand-by mode
power dissipation
Y
Supply voltage LM12L438
25
m
W
à
16.5
m
W
ó
(typ)
3.3V
g
10%
LM12434/8
5V
g
10%
Features
Y
Three operating modes: 12-bit
a
sign, 8-bit
a
sign,
and ‘‘watchdog’’ comparison mode
Y
Single-ended or differential inputs
Y
Built-in Sample-and-Hold
Y
Instruction RAM and event sequencer
Y
8-channel (LM12
à
L
ó
438) or 4-channel (LM12434)
multiplexer
Y
32-word conversion FIFO
Y
Programmable acquisition times and conversion rates
Y
Self-calibration and diagnostic mode
Y
Power down output for system power management
Y
Read while convert capability for maximum through-put
rate
Applications
Y
Data Logging
Y
Portable Instrumentation
Y
Process Control
Y
Energy Management
Y
Robotics
Connection Diagrams
28-Pin PLCC Package
TL/H/11879–1
*
Pin names in ( ) apply to the LM12434
Order Number LM12434CIV, LM12438CIV, or
LM12L438CIV
See NS Package Number V28A
28-Pin Wide Body SO Package
TL/H/11879–2
Order Number LM12434CIWM, LM12438CIWM, or
LM12L438CIWM
See NS Package Number M28B
C
1995 National Semiconductor Corporation
RRD-B30M85/Printed in U. S. A.
相關(guān)PDF資料
PDF描述
LM12434CIV Sign Data Acquisition System with Serial I/O and Self-Calibration
LM12434CIWM Sign Data Acquisition System with Serial I/O and Self-Calibration
LM12454 General Purpose Controller Z84C15
LM12454 12-Bit Sign Data Acquisition System with Self-Calibration
LM12454CIV 12-Bit Sign Data Acquisition System with Self-Calibration
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM12434CIV 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Sign Data Acquisition System with Serial I/O and Self-Calibration
LM12434CIWM 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Sign Data Acquisition System with Serial I/O and Self-Calibration
LM12438CIV 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Sign Data Acquisition System with Serial I/O and Self-Calibration
LM12438CIWM 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Sign Data Acquisition System with Serial I/O and Self-Calibration
LM12454 制造商:未知廠家 制造商全稱:未知廠家 功能描述:General Purpose Controller Z84C15
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