FM Transceiver

Copyright © 2007 by Silicon Laboratories

1.18.07

Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.

Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders

Si4720/21

Broadcast FM Radio Transceiver for Portable Applications

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Frequency Range

76

—

108

MHz

Sensitivity

(S+N)/N = 26 dB

—

2.2

—

µV EMF

Input IP3

AGC disabled

—

108

—

dBµV EMF

Adjacent Channel Selectivity

±200 kHz

—

50

—

dB

Alternate Channel Selectivity

±400 kHz

—

70

—

dB

RX Audio Output Voltage

72

80

90

mVrms

RX Audio Band Limits

±1.5 dB

30

—

15k

Hz

RX Audio S/N

—

63

—

dB

RX Audio THD

—

0.1

—

%

Programmable Transmit Output

Voltage, TXO (Maximum Voltage)

—

115

—

dBµV

Programmable Transmit Output

Voltage, TXO (Minimum Voltage)

—

83

—

dBµV

Transmit Voltage Stability

–1

—

1

dB

Transmit Voltage Step

—

1

2

dB

Transmit Channel Edge Power

—

—

–20

dBC

Transmit Adjacent Channel Power

—

–30

–26

dBC

Pre/de-emphasis Time Constant

FMPE[1:0] = 00

70

75

80

us

FMPE[1:0] = 01

45

50

54

us

TX Audio SNR

—

63

—

dB

TX Audio THD

—

0.1

—

%

TX Audio Stereo Separation

30

35

—

dB

TX Sub Carrier Rejection Ratio

SCR

—

–50

–40

dB

TX Audio Input Signal Level (0 dB)

—

—

0.636

Selected Electrical Specifications

Pin Assignments

GND

PAD

1

2

3

17

18

19

20

11

12

13

14

6

7

8

9

4

5

16

10

15 RIN/DIO

LOUT/DFS

ROUTDIO

GND

RST

NC

TXO

VDD

FMI

RFGND

Package Information

Symbol

Millimeters

Symbol

Millimeters

Min

Nom

Max

Min

Nom

Max

A

0.50

0.55

0.60

f

2.53 BSC

A1

0.00

0.02

0.05

L

0.35

0.40

0.45

b

0.18

0.25

0.30

L1

0.00

—

0.10

c

0.27

0.32

0.37

aaa

—

—

0.10

D

3.00 BSC

bbb

—

—

0.10

D2

1.60

1.70

1.80

ccc

—

—

0.08

e

0.50 BSC

ddd

—

—

0.10

E

3.00 BSC

eee

—

—

0.10

E2

1.60

1.70

1.80