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LM12434CIWM Datasheet

  • LM12434CIWM

  • Sign Data Acquisition System with Serial I/O and Self-Calibr...

  • 80頁

  • NSC

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LM12434 LM12 L 438 12-Bit
a
Sign Data Acquisition System
with Serial I O and Self-Calibration
July 1995
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
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鈥檚 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鈥檚 eight-input
multiplexer The LM12434 has a four-channel multiplexer a
differential multiplexer output and a differential S H input
The LM12434 and LM12 L 438 can also operate with 8-bit
a
sign resolution and in a supervisory 鈥樷€榳atchdog鈥欌€?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鈥檚 SPI QSPI Hitachi鈥檚 SCI 8051 Family鈥檚
Serial Port (Mode 0) I
2
C and the TMS320 Family鈥檚 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
MICROWIRE PLUS
TM
is a trademark of National Semiconductor Corporation
Windows is a registered trademark of Microsoft Corporation
Key Specifications
f
CLK
e
8 MHz L f
CLK
e
6 MHz
Y
Resolution
12-bit
a
sign or 8-bit
a
sign
Y
13-bit conversion time
5 5
ms
7 3
ms
(max)
Y
9-bit conversion time
2 6
ms
3 5
ms
(max)
Y
13-bit Through-put rate
140k samples s 105k sample s (min)
Y
Comparison time (鈥樷€榳atchdog鈥欌€?mode)
1 4
ms
1 8
ms
(max)
Y
Serial Clock
10 MHz 6 MHz (max)
Y
Integral Linearity Error
g
1 LSB (max)
Y
V
range
GND to V
A
a
IN
Y
Power dissipation
45 mW 20 mW (max)
Y
Stand-by mode
power dissipation
25
mW
16 5
mW
(typ)
Y
Supply voltage LM12L438
3 3V
g
10%
LM12434 8
5V
g
10%
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Three operating modes 12-bit
a
sign 8-bit
a
sign
and 鈥樷€榳atchdog鈥欌€?comparison mode
Single-ended or differential inputs
Built-in Sample-and-Hold
Instruction RAM and event sequencer
8-channel (LM12 L 438) or 4-channel (LM12434)
multiplexer
32-word conversion FIFO
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
Data Logging
Portable Instrumentation
Process Control
Energy Management
Robotics
Applications
Y
Y
Y
Y
Y
Connection Diagrams
28-Pin PLCC Package
28-Pin Wide Body SO Package
TL H 11879 鈥?1
TL H 11879 鈥?2
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
Order Number LM12434CIWM LM12438CIWM or
LM12L438CIWM
See NS Package Number M28B
RRD-B30M85 Printed in U S A

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