SI4770-77-A20 Datasheet, PDF(15/54 Page) Silicon Laboratories

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SI4770-77-A20 Datasheet, PDF (15/54 Pages) Silicon Laboratories – HIGH-PERFORMANCE CONSUMER ELECTRONICS

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Si4770/77-A20

Table 7. FM Receiver Characteristics (Continued)

(TAMB = â40 to 85 Â°C, VA = 4.5 to 5.5 V, VD = 2.7 to 3.6 V, VIO1 = 1.7 to 3.6 V, VIO2 = 1.2 to 3.6 V. Typical values measured at

TAMB = 25 Â°C, FM modulation (L = R), FMOD = 1 kHz, FDEV = 22.5 kHz, Deemphasis = 75 Âµsec, RF level = 60 dBÂµV, and

FRF = 98 MHz in application circuit unless otherwise specified)

Parameter

FMO Output

Resistance3

FMO Output

Capacitance3

Test Condition

Nominal FMI to FMO gain = 8 dB,

Source load = 50 ï

Min Typ Max

Unit

125

Dual Receiver Mode

FMI Input

Resistance7,3

FMI Input

Capacitance3

FMI Return Loss3

FMI Input Referred

Noise3

FMI LNA IP33,8

64 MHz < F < 108 MHz

Blockers at 400/800 kHz offset, Max Gain

100

1.5

1.20

nV/ Hz

126

dBÂµV

FMO Output

Resistance3

FMO Output

Capacitance3

Nominal FMI to FMO gain = 8dB,

Source load = 50 ï

250

Audio Outputs: Pins LOUT and ROUT

Audio Frequency

Response Low1,2

Â±3 dB

Audio Frequency

Response High1,2

Â±3 dB

Output Load

Resistance3

At LOUT and ROUT pins

Output Load

Capacitance3

At LOUT and ROUT pins

Output Voltage

Deviation = 22.5 kHz

Power Supply

Rejection Ratio

(PSRR)3

100 Hz ripple on power supply lines.

Ripple voltage = 100 mVPP of power supply

voltage

10 k

112

kHz

125 mVRMS

Notes:

1. Guaranteed by characterization.

2. Measured at TAMB = 25 Â°C.

3. Guaranteed by design.

4. IP3 measured at the FMXIP and FMXIN pins reflects IP3 for mixer stage and all subsequent downstream blocks.

5. Refer to FM test circuit in Figure 5.

6. No A-weighting. Noise integrated from 30 Hz to 15 kHz for audio SINAD and SNR measurements.

7. Input resistance is software configurable.

8. IP3 measured at the FMI input pin reflects IP3 for FMI LNA stage.

9. RDS Synchronization Persistence is the minimum RF level at which the tuner loses synchronization to the RDS PI code

as the RF level decreases from high to low levels.

10. RDS Synchronization Stability is the minimum RF level at which the tuner achieves synchronization to the RDS PI code

as the RF level increases from low to high levels.

11. Noise integrated from 30 Hz to 120 kHz for audio SINAD and SNR measurements.

Rev. 0.9

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