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LA7209V Datasheet(PDF) 10 Page - Sanyo Semicon Device

Part No. LA7209V
Description  Monolithic Linear IC ISO/IEC-14443 (proximity) RF amplifier for contact-less IC card and tag
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Maker  SANYO [Sanyo Semicon Device]
Homepage  http://www.ssdc-jp.com/eng/
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LA7209V
No.A0641-10/14
Description of Functional Settings
1. ASK modulation driver amplifier: ASK modulates the data and outputs it as an RD signal.
(1) Input settings
Pins 2 and 3 input a 13.56MHz carrier signal (pulse/sine wave) as an inverting/noninverting input pair.
The input dynamic range is 500mVp-p.
I/O Characteristics Sample Data
Input level
[mVp-p]
Output level
[Vp-p]
Data : high/low
Ra
[
Ī©]
Rb
[
Ī©]
Rd
[k
Ī©]
Antenna current
[mA]
Data : high/low
IC current
[mA]
Data : high/low
280
7.9/3.9
15
4.7
1
13.5/6.0
20.9/19.4
220
6.3/3.3
15
4.7
1
10.5/4.8
20.7/19.2
180
4.6/2.5
15
4.7
1
7.8/3.7
20.5/19.0
280
7.1/3.3
22
6.8
1
11.9/4.9
20.9/19.4
220
5.6/2.9
22
6.8
1
9.3/4.0
20.7/19.2
180
4.1/2.3
22
6.8
1
7.0/3.1
20.5/19.0
280
6.2/2.9
33
10
1
10.0/3.9
20.9/19.4
220
4.8/2.5
33
10
1
8.0/3.2
20.7/19.2
180
3.5/1.5
33
10
1
6.0/2.5
20.5/19.0
(2) Setting the degree of modulation
The degree of modulating is set by the ratio of the resistors connected between pins 4 and 5 (Ra) and pins 5 and 6 (Rb).
For types B and C, this is determined by the idling current (Ia) determined by Ra and parallel resistance of Ra + Rb.
The degree of modulation is determined by the idling current (Iab).
(Modulation is performed by switching pin 6 (DATA_SW) on and off.)
For type A, the 100% modulation point is determined by the idling current (Iab) determined by the parallel resistance
of Ra + Rb.
(Modulation is performed by switching pin 4 (TYPE_SW) and pin 6 on and off at the same time.)
Setting the Degree of Modulation
Pin 11
Pin 7
High (Type A)
Low (type B and C)
Data high
Data low
Pin 4
*1
On
Pin 6
On
Off
*1 : When type A is selected by setting pin 11 high, SW4 and SW6 operate in a linked manner.
2
3
4
5
6
7
11
MOD
CAR
IN+
CAR
IN-
TYPE
SW
MOD_E
DATA
SW
TYPE
CTL
SW6
Ia
Ra
Ib
Rb
SW4
MOD
DATA
IN




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