Silicon Laboratories SI4734/35-B20 manual Si4734/35-B20, FM Receiver Characteristics1,2

Si4734/35-B20

Table 9. FM Receiver Characteristics1,2

(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –20 to 85 °C)

Parameter	Symbol	Test Condition	Min	Typ	Max	Unit
Input Frequency	fRF		76	—	108	MHz
Sensitivity with Headphone		(S+N)/N = 26 dB	—	2.2	3.5	µV EMF
Network3,4,5
Sensitivity with 50 Ω Network3,4,5,6		(S+N)/N = 26 dB	—	1.1	—	µV EMF
RDS Sensitivity6		Δf = 2 kHz,	—	15	—	µV EMF
		RDS BLER < 5%
LNA Input Resistance6,7			3	4	5	kΩ
LNA Input Capacitance6,7			4	5	6	pF
Input IP36,8			100	105	—	dBµV EMF
AM Suppression3,4,6,7		m = 0.3	40	50	—	dB
Adjacent Channel Selectivity		±200 kHz	35	50	—	dB
Alternate Channel Selectivity		±400 kHz	60	70	—	dB
Spurious Response Rejection6		In-band	35	—	—	dB
Audio Output Voltage3,4,7			72	80	90	mVRMS
Audio Output L/R Imbalance3,7,9			—	—	1	dB
Audio Frequency Response Low6		–3 dB	—	—	30	Hz
Audio Frequency Response High6		–3 dB	15	—	—	kHz
Audio Stereo Separation7,9			25	—	—	dB
Audio Mono S/N3,4,5,7,10			55	63	—	dB
Audio Stereo S/N4,5,7,10,11			—	58	—	dB
Audio THD3,7,9			—	0.1	0.5	%
De-emphasis Time Constant6		FM_DEEMPHASIS = 2	70	75	80	µs
		FM_DEEMPHASIS = 1	45	50	54	µs
Audio Output Load Resistance6,10	RL	Single-ended	10	—	—	kΩ
Audio Output Load Capacitance6,10	CL	Single-ended	—	—	50	pF

Notes:

1.Additional testing information is available in Application Note AN388. Volume = maximum for all tests. Tested at RF = 98.1 MHz.

2.To ensure proper operation and receiver performance, follow the guidelines in “AN383: Antenna Selection and Universal Layout Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.

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

4.Δf = 22.5 kHz.

5.BAF = 300 Hz to 15 kHz, A-weighted.

6.Guaranteed by characterization.

7.VEMF = 1 mV.

8.f2 – f1 > 2 MHz, f0 = 2 x f1 – f2. AGC is disabled. Refer to "6. Pin Descriptions: Si4734/35-GM" on page 30.

9.Δf = 75 kHz.

10.At LOUT and ROUT pins.

11.Analog audio output mode.

12.At temperature (25°C).

12 Rev. 1.0