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LM12454 Datasheet(PDF) 12 Page - Texas Instruments

Part # LM12454
Description  LM12454/LM12458/LM12H458 12-Bit Sign Data Acquisition System with Self-Calibration
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM12454 Datasheet(HTML) 12 Page - Texas Instruments

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LM12454, LM12458, LM12H458
SNAS079A – MAY 2004 – REVISED FEBRUARY 2006
www.ti.com
Digital Characteristics
(1) (2)
The following specifications apply to the LM12454, LM12458, and LM12H458 for VA+ = VD+ = 5V, unless otherwise specified.
Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C.
Typical
Limits
Symbol
Parameter
Conditions
Units
(3)
(4)
VIN(1)
Logical “1” Input Voltage
VA+ = VD+ = 5.5V
2.0
V (min)
VIN(0)
Logical “0” Input Voltage
VA+ = VD+ = 4.5V
0.8
V (max)
IIN(1)
Logical “1” Input Current
VIN = 5V
0.005
1.0
μA (max)
IIN(0)
Logical “0” Input Current
VIN = 0V
−0.005
−1.0
μA (max)
CIN
D0–D15 Input Capacitance
6
pF
VA+ = VD+ = 4.5V
VOUT(1)
Logical “1” Output Voltage
IOUT = −360 μA
2.4
V (min)
IOUT = −10 μA
4.25
V (min)
VA+ = VD+ = 4.5V
VOUT(0)
Logical “0” Output Voltage
0.4
V (max)
IOUT = 1.6 mA
VOUT = 0V
−0.01
−3.0
μA (max)
IOUT
TRI-STATE® Output Leakage Current
VOUT = 5V
0.01
3.0
μA (max)
(1)
Two on-chip diodes are tied to each analog input through a series resistor, as shown below. Input voltage magnitude up to 5V above
VA+ or 5V below GND will not damage the LM12454 or the LM12(H)458. However, errors in the A/D conversion can occur if these
diodes are forward biased by more than 100 mV. As an example, if VA+ is 4.5 VDC, full-scale input voltage must be ≤4.6 VDC to ensure
accurate conversions.
(2)
VA+ and VD+ must be connected together to the same power supply voltage and bypassed with separate capacitors at each V
+ pin to
assure conversion/comparison accuracy.
(3)
Typical figures are at TA = 25°C and represent most likely parametric norm.
(4)
Limits are to AOQL (Average Output Quality Level).
12
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Copyright © 2004–2006, Texas Instruments Incorporated
Product Folder Links: LM12454 LM12458 LM12H458


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