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Page 8 of 11

Issue 0

LANSDALE Semiconductor, Inc.

ML13135

Figure 17a. Single Channel Narrowband FM Receiver at 49.7 MHz

Figure 17b. PC Board Component View

Figure 17c. Optional Data Slicer Circuit

(Using Internal Op Amp)

24

0.2

µH

RF Input

50

Ω Source

62 pF

0.001

23

22

21

20

19

18

150 p

0.01

0.1

360

Ceramic

Filter

10.7 MHz

455 kHz

Quad Coil

10 k

39 k

0.15

1.0 k

17

16

15

14

13

12

0.1

2200 p

3

2

1

4

5

6

7

8

9

10

11

0.1

0.1

Ceramic

Filter

455 kHz

10.245 MHz

Xtal

39 MHz

Xtal

27 p

5.0 p

50 p

5.1 k

120 p

0.1

VCC

1.0

1.0 k

1.0

µH

AF

VCC2

2nd LO

VCC1

1st LO

Varicap

Limiter

Demod

Buffered LO

Output

Recovered

Audio

RSSI

Output

0.01

ML13135

0.001

VCC

1.0 M

Vin

(Pin 17)

20 k

20 k

16

15

14

10 k

FSK Data

Output

10 k

NOTES: 1. 0.2

µH tunable (unshielded) inductor

2. 39 MHz Series mode resonant

3rd Overtone Crystal

3. 1.5

µH tunable (shielded) inductor

4. 10.245 MHz Fundamental mode crystal,

32 pF load

5. 455 kHz ceramic filter, muRata CFU 455B

or equivalent

6. Quadrature coil, Toko 7MC–8128Z (7mm)

or Toko RMC–2A6597HM (10mm)

7. 10.7 MHz ceramic filter, muRata SFE10.7MJ–A

or equivalent

Figure 17.

2200p

27p

5p

0.1

120p

0.1

0.1

0.1

39K

0.1

0.22

0.15

1.0k

360

0.01

62p

1.0 k

39 MHz

10.245 MHz

1.0

10

+4.7

+10

MC34119

XT

XT

+

CF

455 KHz

6

3

4

5

2

1

7

+

+

10k

Legacy Applications Information