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TDA8025 データシート(PDF) 10 Page - NXP Semiconductors |
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TDA8025 データシート(HTML) 10 Page - NXP Semiconductors |
10 / 38 page TDA8025_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 6 April 2009 10 of 38 NXP Semiconductors TDA8025 IC card interface The voltage on PORADJ (VPORADJ) can be calculated as: where: • VDD(INTF) is the interface supply voltage • ratio α (2) An activation can be triggered if (3) where • Vth(max) is the maximum rising external threshold voltage The resistance spread of R1 between a minimum value R1min and a maximum value R1max induces a spread of the ratio α. This is also true for R2. Based on this: (4) where (5) If ∆R1 is the maximum spread of R1 and ∆R2 is the maximum spread of R2 then: (6) (7) (8) where • where β is the accuracy ratio of R1 and R2 (R1 and R2 are considered to be of the same type). Then V PORADJ α = V DD INTF () × α 1 1 R1 R2 ------- + ---------------- = V DD INTF () α V th max () > × V DD INTF () V th max () α -------------------- > ⇒ V DD INTF ()actmin V th max () α min -------------------- = α min 1 1 R1 max R2 min --------------- + ------------------------- = R1 max R1 nom ∆R1 + R1 nom 1 ∆R1 R1 nom --------------- + ⋅ == R2 min R2 nom ∆R2 – R2 nom 1 ∆R2 R2 nom --------------- – ⋅ == α min 1 1 R1 nom 1 ∆R1 R1 nom --------------- + ⋅ R2 nom 1 ∆R2 R2 nom --------------- – ⋅ --------------------------------------------------- + ------------------------------------------------------------ 1 1 R1 nom 1 β + () ⋅ R2 nom 1 β – () ⋅ ------------------------------------- + ----------------------------------------------- V th max () V DD INTF ()actmin ---------------------------------------- == = |
同様の部品番号 - TDA8025 |
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同様の説明 - TDA8025 |
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