U2761B Datasheet, PDF (6/11 Pages) TEMIC Semiconductors – DECT RF / IF IC

U2761B
Typical Application Circuit
RX_ON
TX_ON
RX_DATA
LC–tank
LO_IN
PCB
28 27 26
+
–
OP amp
IF
amp 2
RF/IF
U2761B
25 24 23 22 21
RX
Demodulator
IR
mixer
20 19 18 17
TX
TX
driver
IF amp 1
16 15
Control–
logic LC
Ramp
generator
Matching +
balun
SAW
Filter
Matching +
balun
1
2
3
4
5
6
7
8
9 10 11 12 13 14
RSSI
PU
VS
LC–Tank
MIXER_IN
TX_RF_OUT
RAMP_OUT
14658
Figure 3. Typical application circuit
[ Recommended Baseband Filter (f_3dB 570 kHz)
14659
26
–
28
25 _R3
R1
+
6.8k
13k
27
C1
18p
C2
5.6p
Figure 4. Recommended baseband filter
6 (11)
TEMIC Semiconductor
Preliminary Information
Rev. A4, 10-Mar-98