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TDA8025 データシート(PDF) 10 Page - NXP Semiconductors

部品番号 TDA8025
部品情報  IC card interface
Download  38 Pages
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8025 データシート(HTML) 10 Page - NXP Semiconductors

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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
----------------------------------------
==
=


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