PT4452

V1.0

2

December 2012

APPLICATION CIRCUIT

MODSEL

1

XOUT

2

XIN

3

CE

4

VDD

5

DIN

6

VSSPA

7

PAOUT

8

PT4452

X1

R2

R1

DIN

VDD

C5

C4

L2

L1

C3

C6

C2

C1

EN

FSK

ASK

R3

R4

C7

BILL OF MATERIALS

Part

Value

Unit

315MHz

433.92MHz

X1

9.844M

13.56M

Hz

R1

10K

10K

Ohm

R2

100K

100K

Ohm

R3

0

0

Ohm

R4

0

0

Ohm

C1

22p

18p

F

C2

22p

18p

F

C3

1

μ

1u

F

C4

220p

220p

F

C5

8.2p

4.7p

F

C6

18p

10p

F

C7

2.2

μ

2.2

μ

F

L1

180n

180n

H

L2

33n

27n

H

Notes:

1.

C1/C2 can be used to trim the transmitted signal frequency for matching the specified value.

2.

For FSK application to have adequate frequency deviation, and accurate carrier frequency, the crystal resonator frequency will be lower than the

specified value. The recommended crystal resonator frequency is 9.8388MHz and 13.5545MHz for 315MHz and 433.92MHz band. The loading

capacitor C1/C2 will put below 20pF to have ±50KHz pulling frequency deviation at least.

3.

L2/C5/C6 value will depend on PCB layout.

4.

The recommend maximum ESR value of X1 is 40

Ω.