MC13150 Datasheet, PDF (9/20 Pages) Motorola, Inc – Narrowband FM Coilless Detector IF Subsystem

RF/IF
Input
100 n
(1)
180 nH
100 n
(2)
455 kHz
1
IF Ceramic
Filter
2
3
4
5
1.0 n
100 n
6
7
1.0 n
8
455 kHz
IF Ceramic
Filter
MC13150
Figure 15. Application Circuit
(3)
LO Input
11 p
100 n
32 31 30 29
VEE1
Mixer
VCC1
Local
Oscillator
51
28 27 26
RSSI
Buffer
25
24
23
22
VEE2
21
(4)
Enable
(5)
RSSI
82 k
RSSI
Buffer
Detector
Output
1.0 n
RL
150 k
20
IF
(6)
19
18
Limiter
17
VCC2
9 10 11 12 13 14 15 16
RS
150 k
100 n
1.0 µ
CT
100 n
100 n
560 k
RB
150 k
RT
12 k
RF
(6)
Coilless Detector
Circuit
+
10 µ
VCC
NOTES: 1. Alternate solution is 1:4 impedance transformer (sources include Mini Circuits, Coilcraft and Toko).
2. 455 kHz ceramic filters (source Murata CFU455 series which are selected for various bandwidths).
3. For external LO source, a 51 Ω pull–up resistor is used to bias the base of the on–board transistor as shown in Figure 15.
Designer may provide local oscillator with 3rd, 5th, or 7th overtone crystal oscillator circuit. The PC board is laid out to
accommodate external components needed for a Butler emitter coupled crystal oscillator (see Figure 16).
4. Enable IC by switching the pin to VEE.
5. The resistor is chosen to set the range of RSSI voltage output swing.
6. Details regarding the external components to setup the coilless detector are provided in the application section.
MOTOROLA ANALOG IC DEVICE DATA
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