LA7209V Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LA7209V

ISO/IEC-14443 (proximity) RF amplifier for contact-less IC card and tag

SANYO -> Panasonic 

LA7209V

3. Comparator: Used to provide 0V/5V pulse output of the demodulated data.

(1) Setting the input level

Signals from 10mVp-p to 2Vpp can be handled by using capacitor coupling to input the signal to pin 16.

(2) Setting the output load resistance

The load resistance is set so that the pin 15 current capacity is 2.2mA to 5mA.

Note that this will be the range 2.2 kΩ to 1 kΩ when VCC = 5 V.

4. Variable threshold TAG detector: Detects tags in the communications area

(1) Setting the input level

The input level is determined by the resistor (Rg) connected between pin 19 and ground. Note however, that since the

output level can also be modified at the same time by pins 17 and 18, the adjustment described in step (2) of the

following item is required.

(2) Setting the detection threshold level

The built-in detector's threshold level can be changed by pin 14, and is set so that it can identify whether or not a TAG

is present.

* : The level goes to 500mV if the pin is left open.

(3) Setting the detection (smoothing) capacitor

The built-in detector's sensitivity is adjusted with pin 9. (Minimum capacitance : 10pF)

(4) Setting the output load resistance

Set the load resistance so that the pin 10 pull-in current is in the range 0.2mA to 0.5mA.

Note that this will be the range 10kΩ to 24kΩ when VCC = 5 V.

5. Type switching: For IC card type switching

• Low (0V to 1V) : Type B/C read/write communication is possible

• High (2V to VCC) : Type A read/write communication is possible

6. Power save mode (muting) switching: Used for low-power mode control and driver amplifier output muting

• Low (0V to 1V) : Normal operation ⇒ Read/write communication is possible

• High (2V to VCC) : Power saving mode ⇒ Read/write communication is not possible

No.A0641-12/14

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