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SI4744

Automotive AM/FM Radio Receiver

Silicon Laboratories 

Si4740/41/42/43/44/45

Automotive AM/FM Radio Receiver

Selected Electrical Specifications1

(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –40 to 85 °C)

Parameter

Test Condition

Min Typ Max

Unit

FM

Input Frequency

64

—

108

MHz

Sensitivity

(S+N)/N = 26 dB

—

2

—

µV EMF

RDS Sensitivity

f = 2 kHz, RDS BLER < 5%

—

8

—

µV EMF

Audio S/N (Mono)2,3

Audio THD (Mono)2,3

Input IP3

Audio Output Voltage

fMOD = 1 kHz, f = 22.5 kHz,

VEMF = 60 dBµVEMF

fMOD = 1 kHz, f = 75 kHz,

VEMF = 60 dBµVEMF

f1 = 4000 kHz; f2 = 8000 kHz

—

63

—

dB

—

0.1

—

%

—

105

— dBµV EMF

—

80

—

mVrms

Adjacent Channel Selectivity

±200 kHz

—

50

—

dB

Alternate Channel Selectivity

±400 kHz

—

70

—

dB

AM Suppression4

Audio Stereo Separation4

Supply Voltage5

Supply Current5

m = 0.3; f = 22.5 kHz; fRF = 76 to 108 MHz;

Measured at VEMF = 60 dBµVEMF

—

55

—

dB

fRF = 76 to 108 MHz; Measured at VEMF =

60 dBµVEMF; f = 75 kHz

—

45

—

dB

3

—

3.6

V

—

26

—

mA

AM

Input Frequency

520

—

1710

kHz

Sensitivity

(S+N)/N = 26 dB

—

28

—

µV EMF

Audio S/N4,6

30% modulation, fMOD =1 kHz,

RF level = 74 dBµV EMF; f = 22.5 kHz

—

53

—

dB

Audio THD4,6

Input IP37

Audio Output Voltage4

30% modulation, fMOD =1 kHz,

RF level = 74 dBµV EMF; f = 22.5 kHz

f1 = 40 kHz; f2 = 80 kHz

—

0.3

—

%

—

112

—

dBµV

54

60

66

mVrms

Adjacent Channel Selectivity

±10 kHz

—

40

—

dB

Alternate Channel Selectivity

±20 kHz

—

60

—

dB

Notes:

1. Specifications refer to Si474x application circuit input.

2. BAF = 300 Hz to 15 kHz.

3. fRF = 76 to 108 MHz.

4. FMOD = 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise.

5. Applies to both FM and AM modes.

6. AGC is disabled.

7. Specification refers to Si474x input.

Pin Assignments

4 x 4 x 0.85 mm 24-pin QFN Package Information

24 23 22 21 20 19

FMI 1

18 DFS

RFGND 2

17 DOUT

AGC1 3

NC 4

GND

PAD

16 LOUT

15 ROUT

GND 5

14 GND

AMI 6

13 VDD

7 8 9 10 11 12

Symbol

A

A1

b

D

D2

e

E

E2

L

aaa

bbb

ccc

ddd

eee

Millimeters

Min Nom Max

0.80 0.85 0.90

0.00 0.02 0.05

0.18 0.25 0.30

4.00 BSC

2.00 2.10 2.20

0.50 BSC

4.00 BSC

2.00 2.10 2.20

0.30 0.40 0.50

—

— 0.10

—

— 0.10

—

— 0.08

—

— 0.10

—

— 0.10

AM/FM Receiver

Copyright © 2008 by Silicon Laboratories

10.23.08

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.

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