LM12438 Datasheet PDF - National Semiconductor
| Part Number | LM12438 | |
| Description | 12-Bit + Sign Data Acquisition System | |
| Manufacturers | National Semiconductor | |
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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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2 0 Electrical Specifications
2 1 RATINGS
2 1 1 Absolute Maximum Ratings (Notes 1 2)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage (VAa and VDa)
Voltage at Input and Output Pins
except IN0–IN3 (LM12434)
and IN0–IN7 (LM12 L 438)
6 0V
b0 3V to Va a 0 3V
Voltage at Analog Inputs IN0–IN3 (LM12434)
and IN0–IN7 (LM12 L 438)
GND b 5V to Va a 5V
l lVAa b VDa
lAGND b DGNDl
300 mV
300 mV
Input Current at Any Pin (Note 3)
g5 mA
Package Input Current (Note 3)
g20 mA
Power Dissipation (TA e 25 C) (Note 4)
V Package
WM Package
Storage Temperature
b65 C to a150 C
Soldering Information Lead Temperature (Note 19)
V Package Vapor Phase (60 seconds)
Infrared (15 seconds)
WM Package Vapor Phase (60 seconds)
Infrared (15 seconds)
ESD Susceptibility (Note 5)
1 5 kV
2 1 2 Operating Ratings (Notes 1 2)
Temperature Range
(Tmin s TA s Tmax)
LM12434CIV LM12 L 438CIV
b40 C s TA s 85 C
LM12434CIWM LM12 L 438CIWM b40 C s TA s 85 C
Supply Voltage
VAa VDa
l lVAa b VDa
lAGDND b DGNDl
3 0V to 5 5V
s100 mV
s100 mV
Analog Inputs Range
VREFa Input Voltage
VREFb Input Voltage
VREFa b VREFb
VREF Common Mode
Range (Note 16)
GND s VINa s VAa
1V s VREFa s VAa
0V s VREFb s VREFa b 1V
1V s VREF s VAa
0 1 VAa s VREFCM s 0 6 VAa
2 2 PERFORMANCE CHARACTERISTICS All specifications apply to the LM12434 LM12438 and LM12L438 unless otherwise
noted Specifications in braces apply only to the LM12L438
2 2 1 Converter Static Characteristics The following specifications apply to the LM12434 and LM12 L 438 for VAa e
VDa e 5V 3 3V AGND e DGND e 0V VREFa e 4 096V 2 5V VREFb e 0V 12-bit a sign conversion mode fCLK e
8 0 MHz 6 MHz RS e 25X source impedance for VREFa and VREFb s 25X fully-differential input with fixed 2 048V
1 25V common-mode voltage and minimum acquisition time unless otherwise specified Boldface limits apply for TA e
TJ e TMIN to TMAX all other limits TA e TJ e 25 C (Notes 6 7 8 and 9)
Symbol
Parameter
Conditions
Typical
(Note 10)
Limits
(Note 11)
Units
(Limit)
ILE Positive and Negative Integral
Linearity Error
After Auto-Cal (Notes 12 17)
g0 35
g1 LSB (max)
TUE Total Unadjusted Error
After Auto-Cal (Note 12)
g1
LSB
Resolution with No Missing Codes
After Auto-Cal (Note 12)
13 Bits
DNL
Differential Non-Linearity
After Auto-Cal
g0 2
g1 LSB (max)
Zero Error
After Auto-Cal (Notes 13 17)
g0 2
g1 LSB (max)
Positive Full-Scale Error
After Auto-Cal (Notes 12 17)
g0 2
g2 LSB (max)
Negative Full-Scale Error
After Auto-Cal (Notes 12 17)
g0 2
g2 LSB (max)
DC Common Mode Error
(Note 14)
g2
g3 5
LSB (max)
g4 0
ILE 8-Bit a Sign and ‘‘Watchdog’’
Mode Positive and Negative
Integral Linearity Error
(Note 12)
g0 15
g1 2
LSB (max)
TUE 8-Bit a Sign and ‘‘Watchdog’’ Mode After Auto-Zero
Total Unadjusted Error
g1 2
g1 2
LSB (max)
8-Bit a Sign and ‘‘Watchdog’’ Mode
Resolution with No Missing Codes
9 Bits (max)
5
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| Information | Total 30 Pages | |
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