SI4844-A10-GU【PDF 8/26 页】IC AM/FM RX FOR DIGITAL RADIOS

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Si4840/44-A10

Table 5. FM Receiver Characteristics 1,2

(V DD = 2.7 to 3.6 V, TA = –15 to 85 °C)

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Input Frequency

Sensitivity with Headphone

f RF

(S+N)/N = 26 dB

64

—

—

2.2

109

—

MHz

μV EMF

Network 3

LNA Input Resistance 4,5

LNA Input Capacitance 4,5

—

—

4

5

—

—

k ?

pF

AM Suppression 4,5,6,7

Input IP3 4,8

Adjacent Channel Selectivity 4

Alternate Channel Selectivity 4

Audio Output Voltage 5,6,7,12

Audio Mono S/N 5,6,7,9,10

Audio Stereo S/N 3,4,5,7,9,10

Audio Frequency Response Low 4

Audio Frequency Response High 4

Audio Stereo Separation 5,11

Audio THD 5,6,11

m = 0.3

±200 kHz

±400 kHz

–3 dB

–3 dB

—

—

—

—

—

—

—

—

15

—

—

50

105

50

65

80

55

55

—

—

40

0.1

—

—

—

—

—

—

—

30

—

—

0.5

dB

dBμV EMF

dB

dB

mV RMS

dB

dB

Hz

kHz

dB

%

Audio Output Load Resistance 4,10

Audio Output Load Capacitance 4,10

Powerup/Band Switch Time 4

R L

C L

Single-ended

Single-ended

10

—

—

—

—

—

—

50

110

k ?

pF

ms

Notes:

1. Additional testing information is available in “AN603: Si4840/44 DEMO Board Test Procedure.” Volume = maximum

for all tests. Tested at RF = 98.1 MHz.

2. To ensure proper operation and receiver performance, follow the guidelines in “AN602: Si484x-A Antenna, Schematic,

Layout, and Design Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.

3. Frequency is 64~109 MHz.

4. Guaranteed by characterization.

5. V EMF = 1 mV.

6. F MOD = 1 kHz, MONO, and L = R unless noted otherwise.

7. ? f = 22.5 kHz.

8. |f 2 – f 1 | > 2 MHz, f 0 = 2 x f 1 – f 2 .

9. B AF = 300 Hz to 15 kHz, A-weighted.

10. At L OUT and R OUT pins.

11. ? f = 75 kHz.

12. Tested in Digital Volume Mode.

8

Rev.1.0

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