PT4501

PRE1.1

3

September 2014

APPLICATION CIRCUIT

VDD_3V

VDDTX

TVDD

R3

R4

R6

C9

C13

VSSLNA

1

TXOUT

2

RXIN

3

VDDTX

4

VRF

6

TXRXHW

13

SS

15

MISO

16

MOSI

17

18

PT4501

X1

C1

C3

U1

7

8

10

11

12

19

20

21

22

24

L3

L2

C4

C5

C6

VDDTX

SS

MISO

MOSI

ANT

GIO

GIO

R1

R5

AVDD

NC

5

9

C7

RFSEL

14

23

C8

R2

C12

C2

L1

C10

C11

BILL OF MATERIALS

Part

Value

Unit

315 MHz

434 MHz

470 MHz

868 MHz

915 MHz

C1/C4/C7/C10/C13

10n

10n

10n

10n

10n

F

C2

2.7p

1.5p

1.5p

1.2p

1.5p

F

C3

220p

220p

220p

680p

680p

F

C5/C6

33p/33p

33p/33p

33p/33p

33p/33p

33p/33p

F

C8

680p

680p

680p

680p

680p

F

C9

10

μ

10

μ

10

μ

10

μ

10

μ

F

C11/C12

NC

NC

NC

NC

NC

F

L1

47n

39n

33n

10n

8.2n

H

L2

6.8n

6.8n

6.8n

5.6n

5.6n

H

L3

18n

22n

22n

33n

39n

H

R1

68K

68K

68K

68K

68K

Ω

R2

150K

150K

150K

150K

150K

Ω

R3

0

0

0

0

0

Ω

R4/R5/R6

10

10

10

10

10

Ω

X1 (crystal)

20

MHz



U1

PT4501 IC

-

Notes:

1.

L1/L2/L3 and C2/C3 are the components for input matching network. They may need to be adjusted for different PCB layout

and antenna requirements.

2.

R1 is used for adjusting the threshold voltage of carrier sense window.