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LA7209V Datasheet(PDF) 11 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.A0641-11/14
Degree of Modulation Sample Data
Input level
[mVp-p]
Output level
[Vp-p]
Data : high/low
Ra
[
Ω]
Rb
[
Ω]
Rd
[k
Ω]
Antenna current
[mA]
Data : high/low
IC current
[mA]
Data : high/low
Degree of modulatio
[%]
220
4.8/3.9
10
33
1
8.0/6.0
20.7/19.2
10
220
4.8/0.0
10
33
1
8.0/0.1
20.7/19.2
100
* : This IC can support out-of-standard modulation levels by settings using the resistors Ra and Rb described above.
(3) Output level setting
The output level is set by setting the two items (the input level and the idling current) described above and the
damping resistor (Rd) between pins 22 and 23. Note that although an output amplitude (at pins 22 and 23) of about
two times the VCC voltage can be acquired, if the output voltage limit is exceeded, a collision with the pin 5 voltage
occurs and abnormal oscillation due to VCE saturation may occur. In such cases, changes to the antenna structure
(VCC midpoint supply) and/or damping of the output level will be required.
Output Damping Characteristics Sample Data
Rd
[
Ω]
Output level
[Vp-p]
Data : high/low
Ra
[
Ω]
Rb
[
Ω]
Input level
[mVp-p]
Antenna current
[mA]
Data : high/low
IC current
[mA]
Data : high/low
3.9
8.5/4.6
15
4.7
180
7.8/3.7
20.5/19.0
2.2
6.9/3.5
15
4.7
180
7.8/3.7
20.5/19.0
1
4.6/2.5
15
4.7
180
7.8/3.7
20.5/19.0
3.9
8.1/4.3
22
6.8
180
7.0/3.1
20.5/19.0
2.2
6.5/3.3
22
6.8
180
7.0/3.1
20.5/19.0
1
4.1/2.3
22
6.8
180
7.0/3.1
20.5/19.0
3.9
7.5/3.5
33
10
180
6.0/2.5
20.5/19.0
2.2
5.8/2.9
33
10
180
6.0/2.5
20.5/19.0
1
3.5/1.9
33
10
180
6.0/2.5
20.5/19.0
2. Read amplifier (diode detector, bandpass filter, variable amplifier + fixed amplifier) : Data modulation from
the RF signal
(1) Level setting
The input level is determined by voltage division by the capacitors connected between pins 21 and 22 and between
pins 23 and 24 and the IC internal capacitance. However, note that the input dynamic range of pins 21 and 24 is the
same as the VCC voltage.
(2) Variable amplifier gain setting
The gain is determined by the value of the resistor (Rg) connected between pin 19 and ground.
Note that the range of values that may be used for Rg is from 4.7k
Ω (minimum gain) to 100kΩ (maximum gain).
Bandpass Filter Characteristics
– 30
– 20
– 10
– 15
– 25
0
– 5
10
100
1000
10000
Frequency [kHz]
Variable Amplifier Gain Characteristics
0
10
20
15
5
30
25
0
1020
30
40
50
6070
80
90
100
Pin 19 resistance (=Rg) [k
Ω]




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