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LM12454 Datasheet(PDF) 11 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) 11 Page - Texas Instruments

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LM12454, LM12458, LM12H458
www.ti.com
SNAS079A – MAY 2004 – REVISED FEBRUARY 2006
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.
(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).
Copyright © 2004–2006, Texas Instruments Incorporated
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Product Folder Links: LM12454 LM12458 LM12H458


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