SI4844-A10-GU【PDF 9/26 页】IC AM/FM RX FOR DIGITAL RADIOS

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Si4840/44-A10

Table 6. AM/SW Receiver Characteristics 1, 2

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

Parameter

Input Frequency

Sensitivity 3,4,5

Large Signal Voltage Handling 5

Power Supply Rejection Ratio 5

Audio Output Voltage 3,6,8

Audio S/N 3,4,6

Audio THD 3,6

Antenna Inductance 5,7

Powerup/Band Switch Time 5

Symbol

f RF

Test Condition

Medium Wave (AM)

Short Wave (SW)

(S+N)/N = 26 dB

THD < 8%

? V DD = 100 mV RMS , 100 Hz

From powerdown

Min

504

2.3

—

—

—

—

—

—

180

—

Typ

—

—

30

300

40

60

55

0.1

—

—

Max

1750

28.5

—

—

—

—

—

0.5

450

110

Unit

kHz

MHz

μV EMF

mV RMS

dB

mV RMS

dB

%

μH

ms

Notes:

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

for all tests. Tested at RF = 520 kHz.

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. FMOD = 1 kHz, 30% modulation, 2 kHz channel filter.

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

5. Guaranteed by characterization.

6. V IN = 5 mVrms.

7. Stray capacitance on antenna and board must be < 10 pF to achieve full tuning range at higher inductance levels.

8. Tested in Digital Volume Mode.

Table 7. Reference Clock and Crystal Characteristics

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

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Reference Clock

XTALI Supported Reference Clock

—

32.768

—

kHz

Frequencies

Reference Clock Frequency

–100

—

100

ppm

Tolerance for XTALI

Crystal Oscillator

Crystal Oscillator Frequency

Crystal Frequency Tolerance

Board Capacitance

—

–100

—

32.768

—

—

—

100

3.5

kHz

ppm

pF

Rev.1.0

9

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