U2270B Datasheet, PDF (8/13 Pages) TEMIC Semiconductors – Read / Write Base Station IC

U2270B
Application 1
Application using few external components. This application is for intense magnetic coupling only.
9693
110 kW
5V
47 nF
47 mF
V_Batt
V_EXT V_S
DV_S
U2270B
C_IN
1N4148
INPUT
RF
MS
CFE
OE
STANDBY
OUTPUT
HIPASS
470 kW
C_HP
COIL1
1.5 nF
R
1.35 mH
1.2 nF
COIL2
DGND
GND
V_DD
Micro-
controller
V_SS
Figure 14.
Application 2
Basic application using diode feedback. This application permits higher communication distances than application 1.
12605
BC639
360 W
12 V
4x
1N4148
68 kW
22 mF
75 kW
4.7 nF
22 mF
22 mF
GND
100 kW
43 kW
V_S V_EXT DV_S V_Batt
V_DD
1.2 nF
1.35 mH 82 W
Antenna
1N4148
C_IN
470 kW
1.5 nF
C_HP
RF
MS
COIL 2
CFE
U2270B
COIL 1
Standby
Input
Output
HIPASS
OE
DGND GND
Micro-
controller
I/O
V_SS
Figure 15.
8 (13)
TELEFUNKEN Semiconductors
Rev. A3, 13-Dec-96