American Audio B20 Bedienungsanleitung PDF herunterladen (Seite 13)

Si473x-B20

Rev. 0.5 13

Table 8. AM/SW/LW Receiver Characteristics

= 2.7 to 5.5 V, V

= 1.5 to 3.6 V, TA = –20 to 85 °C)

Parameter Symbol Test Condition Min Typ Max Unit

Input Frequency

Long Wave (LW) 153 — 279 kHz

Medium Wave (AM) 520 — 1710 kHz

Short Wave (SW) 2.3 — 21.85 MHz

Sensitivity

2,3,4,5, 6

(S+N)/N = 26 dB — 25 35 µV EMF

Large Signal Voltage Handling

5,7

THD < 8% — 300 — mV

RMS

Power Supply Rejection Ratio ΔV

=100 mV

RMS

, 100 Hz — 40 — dB

Audio Output Voltage

2,8

54 60 67 mV

RMS

Audio S/N

2,3,4,6,8

50 56 — dB

Audio THD

2,4,8

— 0.1 0.5 %

Antenna Inductance

Long Wave (LW) — 2800 —

µH

Medium Wave (AM) 180 — 450

Powerup Time From powerdown — — 110 ms

Notes:

1. To ensure proper operation and receiver performance, follow the guidelines in “AN383: Si47xx Antenna, Schematic,

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

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

3. B

= 300 Hz to 15 kHz, A-weighted.

4. f

= 1000 kHz, f = 10 kHz.

5. Guaranteed by characterization.

6. Analog audio output mode.

7. See “AN388: Si470X/1X/2X/3X/4X Evaluation Board Test Procedure” for evaluation method.

8. V

= 5 mVrms.

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

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