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| 型號： | LM12438CIWMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封裝： | SOP-28 |
| 文件頁數(shù)： | 1/80頁 |
| 文件大?。?/td> | 1552K |
| 代理商： | LM12438CIWMX |
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TLH11879
LM12434LM12
L
438
12-Bit
a
Sign
Data
Acquisition
System
with
Serial
IO
and
Self-Calibration
July 1995
LM12434LM12 L 438 12-Bit a Sign Data Acquisition
System with Serial IO 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
errors) 13-bit (12-bit a sign) analog-to-digital converter
(ADC) and sample-and-hold (SH) 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 SH input
The LM12434 and LM12 L 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 IO interface bus The
serial interface bus is user selectable to interface with the
following protocols with zero glue logic
MICROWIRE
PLUSTM Motorola’s SPIQSPI Hitachi’s SCI 8051 Family’s
Serial Port (Mode 0) I2C and the TMS320 Family’s Serial
Port
An evaluation kit for demonstrating the LM12434 and
LM12 L 438 is available
TRI-STATE
is a registered trademark of National Semiconductor Corporation
MICROWIREPLUSTM is a trademark of National Semiconductor Corporation
Windows
is a registered trademark of Microsoft Corporation
Key Specifications
fCLK e 8 MHz L fCLK e 6 MHz
Y
Resolution
12-bit a sign or 8-bit a sign
Y
13-bit conversion time
55 ms 73 ms (max)
Y
9-bit conversion time
26 ms 35 ms (max)
Y
13-bit Through-put rate
140k sampless 105k samples (min)
Y
Comparison time (‘‘watchdog’’ mode)
14 ms 18 ms (max)
Y
Serial Clock
10 MHz 6 MHz (max)
Y
Integral Linearity Error
g
1 LSB (max)
Y
VIN range
GND to VAa
Y
Power dissipation
45 mW 20 mW (max)
Y
Stand-by mode
power dissipation
25 mW 165 mW (typ)
Y
Supply voltage LM12L438
33V g10%
LM124348
5V g10%
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 L 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
TLH11879 – 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
TLH11879 – 2
Order Number LM12434CIWM LM12438CIWM or
LM12L438CIWM
See NS Package Number M28B
C1995 National Semiconductor Corporation
RRD-B30M85Printed in U S A
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