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PDF LM12L458CIV Data sheet ( Hoja de datos )
| Número de pieza | LM12L458CIV | |
| Descripción | 12-Bit Sign Data Acquisition System with Self-Calibration | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM12L458CIV (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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July 1999
LM12L458
12-Bit + Sign Data Acquisition System with
Self-Calibration
General Description
The LM12L458 is a highly integrated 3.3V Data Acquisition
System. It combines a fully-differential self-calibrating (cor-
recting linearity and zero errors) 13-bit (12-bit + sign)
analog-to-digital converter (ADC) and sample-and-hold
(S/H) with extensive analog functions and digital functional-
ity. Up to 32 consecutive conversions, using two’s comple-
ment format, can be stored in an internal 32-word (16-bit
wide) FIFO data buffer. An internal 8-word RAM can store
the conversion sequence for up to eight acquisitions through
the LM12L458’s eight-input multiplexer. The LM12L458 can
also operate with 8-bit + sign resolution and in a supervisory
“watchdog” mode that compares an input signal against two
programmable limits. Programmable acquisition times and
conversion rates are possible through the use of internal
clock-driven timers.
All registers, RAM, and FIFO are directly addressable
through the high speed microprocessor interface to either an
8-bit or 16-bit databus. The LM12L458 includes a direct
memory access (DMA) interface for high-speed conversion
data transfer.
Applications
n Data Logging
n Process Control
n Energy Management
n Medical Instrumentation
Key Specifications
(fCLK = 6 MHz)
n Resolution
12-bit + sign or 8-bit + sign
n 13-bit conversion time
7.3 µs
n 9-bit conversion time
3.5 µs
n 13-bit Through-put rate
106k samples/s (min)
n Comparison time (“watchdog” mode)
1.8 µs (max)
n ILE
±1 LSB (max)
n VIN range
GND to VA+
n Power dissipation
15 mW (max)
n Stand-by mode
5 µW (typ)
n Single supply
3V to 5.5V
Features
n Three operating modes: 12-bit + sign, 8-bit + sign, and
“watchdog”
n Single-ended or differential inputs
n Built-in Sample-and-Hold
n Instruction RAM and event sequencer
n 8-channel multiplexer
n 32-word conversion FIFO
n Programmable acquisition times and conversion rates
n Self-calibration and diagnostic mode
n 8- or 16-bit wide databus microprocessor or DSP
interface
n CMOS compatible I/O
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
AT® is a registered trademark of International Business Machines Corporation.
© 1999 National Semiconductor Corporation DS011711
www.national.com
1 page  
DC Characteristics
The
time
following specifications apply for VA+
unless otherwise specified. Boldface
= VD+
limits
a=p3p.l3yVf,oVrRTEAF+==T2J .5=VT,MVINREtFo−
= 0V,
TMAX;
afCllLoKth=e6r .l0imMitsHzTAan=dTmJ i=nim25u˚mC.a(cNqoutiessiti6o,n
7, 8)
Symbol
Parameter
Conditions
Typical
Limits
Unit
(Note 10) (Note 11)
(Limit)
ID+ VD+ Supply Current
IA+ VA+ Supply Current
CS = “1”
CS = “1”
0.4 1.0 mA (max)
2.25 3.5 mA (max)
IST Stand-By Supply Current Power-Down Mode Selected
(ID+ + IA+)
Clock Stopped
1.5
4.5 µA (max)
6 MHz Clock
30
µA (max)
Multiplexer ON-Channel
Leakage Current
VA+ = 3.6V
ON-Channel = 3.6V
OFF-Channel = 0V
0.1
0.3 µA (max)
ON-Channel = 0V
OFF-Channel = 3.6V
0.1
0.3 µA (max)
Multiplexer OFF-Channel
Leakage Current
VA+ = 3.6V
ON-Channel = 3.6V
OFF-Channel = 0V
0.1
0.3 µA (max)
ON-Channel = 0V
OFF-Channel = 3.6V
0.1
0.3 µA (max)
RON
Multiplexer ON-Resistance
Multiplexer
Channel-to-Channel
RON matching
VIN = 3.3V
VIN = 1.65V
VIN = 0V
VIN = 3.3V
VIN = 1.65V
VIN = 0V
850
1300
830
±1.0%
±1.0%
±1.0%
1500
2000
1500
±3.0%
±3.0%
±3.0%
Ω
Ω
Ω
Ω
Ω
Ω
Digital Characteristics
The following specifications apply for
TMIN to TMAX; all other limits TA = TJ
V=A2+5=˚CV. D(N+o=te3s.36V, ,7,un8l)ess
otherwise
specified.
Boldface
limits
apply
for
TA
=
TJ
=
Symbol
Parameter
Conditions
Typical
Limits
Unit
(Note 10)
(Note 11)
(Limit)
VIN(1)
VIN(0)
Logical “1” Input Voltage
Logical “0” Input Voltage
VA+ = VD+ = 3.6V
VA+ = VD+ = 3.0V
ALE, Pin 22
2.0 V (min)
0.7 V (max)
0.6
IIN(1)
Logical “1” Input Current
VIN = 3.3V
0.005
1.0 µA (max)
2.0
IIN(0)
Logical “0” Input Current
VIN = 0V
−0.005
−1.0
−2.0
µA (max)
CIN
VOUT(1)
VOUT(0)
IOUT
D0–D15 Input Capacitance
Logical “1” Output Voltage
Logical “0” Output Voltage
TRI-STATE® Output Leakage Current
VA+ = VD+ = 3.0V
IOUT = −360 µA
IOUT = −10 µA
VA+ = VD+ = 3.0V
IOUT = 1.6 mA
IOUT = 10 µA
VOUT = 0V
VOUT = 3.3V
6
−0.01
0.01
2.4
2.85
0.4
0.1
−3.0
3.0
pF
V (min)
V (min)
V (max)
µA (max)
µA (max)
5 www.national.com
5 Page 
Digital Timing Characteristics (Continued)
FIGURE 5. Transfer Characteristic
DS011711-9
DS011711-10
FIGURE 6. Simplified Error Curve vs Output Code without Auto-Calibration or Auto-Zero Cycles
11 www.national.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LM12L458CIV.PDF ] | |
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