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LM12458CIV データシート(PDF) 10 Page - Texas Instruments

部品番号 LM12458CIV
部品情報  12-Bit Sign Data Acquisition System
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ホームページ  http://www.ti.com
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LM12458CIV データシート(HTML) 10 Page - Texas Instruments

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LM12454, LM12458, LM12H458
SNAS079A – MAY 2004 – REVISED FEBRUARY 2006
www.ti.com
INTERNAL REFERENCE 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)
VREFOUT
Internal Reference Output Voltage
2.5
2.5 ±4%
V (max)
Internal Reference Temperature
ΔVREF/ΔT
40
ppm/°C
Coefficient
Sourcing (0 < IL ≤ +4 mA)
0.2
%/mA (max)
ΔREF/ΔIL
Internal Reference Load Regulation
Sinking (
−1 ≤ IIL < 0 mA)
1.2
%/mA (max)
ΔVREF
Line Regulation
4.5V
≤ VA+ ≤ 5.5V
3
20
mV (max)
ISC
Internal Reference Short Circuit Current
VREFOUT = 0V
13
25
mA (max)
ΔVREF/Δt
Long Term Stability
200
ppm/kHr
VA+ = VD+ = 0V →
tSU
Internal Reference Start-Up Time
10
ms
5V, CL = 100 μF
(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. See Figure 3
(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).
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. See Figure 3
(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).
10
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Copyright © 2004–2006, Texas Instruments Incorporated
Product Folder Links: LM12454 LM12458 LM12H458


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