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LM12L438 PDF даташит

Спецификация LM12L438 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «12-Bit + Sign Data Acquisition System».

Детали детали

Номер произв LM12L438
Описание 12-Bit + Sign Data Acquisition System
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM12L438 Даташит, Описание, Даташиты
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’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
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 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
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
MICROWIRE PLUSTM 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
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 (‘‘watchdog’’ mode)
1 4 ms 1 8 ms (max)
Y Serial Clock
10 MHz 6 MHz (max)
Y Integral Linearity Error
g1 LSB (max)
Y VIN range
Y Power dissipation
GND to VAa
45 mW 20 mW (max)
Y Stand-by mode
power dissipation
25 mW 16 5 mW (typ)
Y Supply voltage LM12L438
LM12434 8
3 3V g10%
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
28-Pin Wide Body SO Package
TL H 11879 – 1
Pin names in ( ) apply to the LM12434
Order Number LM12434CIV LM12438CIV or
LM12L438CIV
See NS Package Number V28A
C1995 National Semiconductor Corporation TL H 11879
TL H 11879 – 2
Order Number LM12434CIWM LM12438CIWM or
LM12L438CIWM
See NS Package Number M28B
RRD-B30M85 Printed in U S A









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LM12L438 Даташит, Описание, Даташиты
Table of Contents
1 0 FUNCTIONAL DIAGRAMS
2 0 ELECTRICAL SPECIFICATIONS
2 1 Ratings
2 1 1 Absolute Maximum Ratings
2 1 2 Operating Ratings
2 2 Performance Characteristics
2 2 1 Converter Static Characteristics
2 2 2 Converter Dynamic Characteristics
2 2 3 DC Characteristics
2 2 4 Digital DC Characteristics
2 3 Digital Switching Characteristics
2 3 1 Standard Interface Mode
2 3 2 8051 Interface Mode
2 3 3 TMS320 Interface Mode
2 3 4 I2C Bus Interface
2 4 Notes on Specifications
3 0 ELECTRICAL CHARACTERISTICS
4 0 TYPICAL PERFORMANCE CHARACTERISTICS
5 0 PIN DESCRIPTIONS
6 0 OPERATIONAL INFORMATION
6 1 Functional Description
6 2 Internal User-Accessible Registers
6 2 1 Instruction RAM
6 2 2 Configuration Register
6 2 3 Interrupts
6 2 4 Interrupt Enable Register
6 2 5 Interrupt Status Register
6 2 6 Limit Status Register
6 2 7 Timer
6 2 8 FIFO
6 3 Instruction Sequencer
3
5
5
5
5
5
5
6
8
9
10
10
11
12
13
14
15
19
23
27
27
31
31
38
38
39
39
40
40
40
41
7 0 DIGITAL INTERFACE
43
7 1 Standard Interface Mode
43
7 1 1 Examples of Interfacing to the HPC 46XXX’s
MICROWIRE PLUSTM and 68HC11’s SPI 50
7 2 8051 Interface Mode
59
7 2 1 Example of Interfacing to the 8051
62
7 3 TMS320 Interface Mode
66
7 3 1 Example of Interfacing to the TMS320C3x 69
7 4 I2C Bus Interface
74
7 4 1 Example of Interfacing to an I2C Controller 76
8 0 ANALOG CONSIDERATIONS
8 1 Reference Voltage
8 2 Input Range
8 3 Input Current
8 4 Input Source Resistance
8 5 Input Bypass Capacitance
8 6 Input Noise
8 7 Power Supply Consideration
8 8 PC Board Layout and Grounding Consideration
77
77
77
77
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78
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LM12L438 Даташит, Описание, Даташиты
1 0 Functional Diagrams
LM12434
TL H 11879 – 3
INTERFACE
Standard
8051
I2C
TMS320
Internal pull-up
MODESEL1
0
0
1
1
MODESEL2
1
0
0
1
P1
RF
1
SAD0
FSR
P2
CS
1
SAD1
FSX
P3
DI
CS
SAD2
DX
P4
DO
RXD
SDA
DR
P5
SCLK
TXD
SCL
SCLK
Ordering Information (LM12434)
Part Number
LM12434CIV
LM12434CIWM
Package Type
28-Pin PLCC
28-Pin Wide Body SO
NSC Package Number
V28A
M28B
Temperature Range
b40 C to a85 C
b40 C to a85 C
3










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Номер в каталогеОписаниеПроизводители
LM12L43812-Bit + Sign Data Acquisition SystemNational Semiconductor
National Semiconductor

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