AK2127 Datasheet, PDF (6/6 Pages) List of Unclassifed Manufacturers – Receiver/ Demodulator for time code signals transmitted by the transmitter

Application Circuit With TFA2127 in SOP 16 for DCF-Receiver
47n
22n
4.7µ
16
15
14
13
12
11
10
9
TFA 2127
1
2
3
4
5
6
7
8
OPU
100k
100k
OPD
77.5 kHz
6.8n
FERRITE
ANTENNA
* Switch on ground: Start, Power on
Switch open or on V_CC: Stop, Stand-by
STAND BY *
100n
4.7µ
V_S = 1.5 V
Application Information
The PCB has to be designed for RF conditions. To achieve a high selectivity the parasitic parallel capacitance of
the X-tal resonator should be 1...1.5 pF.
For a trouble-free reception the capacitors on V_CC2 and AP3 have to be arranged nearby the chip food prints.
The dimensioning of the antenna resonant resistance is a compromise between high signal voltage and low
antenna noise voltage.
Q factor of antenna should be high for attenuation of interference signals. In the application circuit is R_res < 100 k;
Q = 80.