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LM12454 Datasheet(PDF) 11 Page - Texas Instruments |
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LM12454 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 45 page  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 Submit Documentation Feedback 11 Product Folder Links: LM12454 LM12458 LM12H458 |
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