U2740B-BFP
| Model | U2740B-BFP |
| Description | UHF AM/FM Transmitter |
| PDF file | Total 10 pages (File size: 267K) |
| Chip Manufacturer | TEMIC |
U2740B
Application Circuit (FSK Modulation)
L
osc
2.2 pF
1
2.7 pF
V
S
2
f
:128
I
4
4
V
Ref
I
Ref
Power–
up
PA
13
I
S
12
1 nF
I
11
6
11
I
10
7
10
12 pF
8
XTO
9
39 pF
V
S
R
10
10 nF
C
10,
C
11
= 4.7 pF
V
S
I
13
VCO
15
I
14
14
R
14
10 kΩ
Loop antenna
16
I
16
R
16
3
R
4
5
Data
Clock
Power–up
Output power
13327
Lock detect
µC
Figure 7.
Principle of Operation (FSK Modulation)
CS
(power-up)
XTO_out
1/fxtal
locked
LD
4/fxtal
AM_in
(data/power)
FM_in
(data)
RFout
Time
13328
Figure 8.
8 (10)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A3, 24-Feb-97
