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SI4777

HIGH-PERFORMANCE CONSUMER ELECTRONICS BROADCAST RADIO RECEIVER AND HD RADIO TUNER

Silicon Laboratories 

Si4770/77-A20

Table 7. FM Receiver Characteristics (Continued)

(TAMB = –40 to 85 °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 °C, FM modulation (L = R), FMOD = 1 kHz, FDEV = 22.5 kHz, Deemphasis = 75 µsec, RF level = 60 dBµV, and

FRF = 98 MHz in application circuit unless otherwise specified)

Parameter

Test Condition

Min Typ Max

Unit

Alternate Channel

Audio SINAD = 26 dB

65

72

—

dB

Rejection6

Desired = 40 dBµV, FMOD = 1 kHz,

FDEV = 22.5 kHz

Undesired at ±200 kHz offset, FMOD = 400 Hz,

FDEV = 22.5 kHz

THD

Mono (S+N)/N6

FDEV = 75 kHz

—

0.05

0.1

%

66

75

—

dB

Stereo (S+N)/N6

Stereo modulation (L = 1, R = 0),

deviation = 67.5 kHz,

pilot deviation = 6.75 kHz

64

70

—

dB

AM Suppression1

AM: m = 0.3/Fmod = 1 kHz, RF level = 60 dBµV 50

55

—

dB

De-Emphasis Time

Constant3

70

75

80

µsec

45

50

54

µsec

L/R Imbalance

Deviation = 75 kHz

–1

—

1

dB

Stereo Separation

Stereo modulation (L = 1, R = 0),

40

43

—

dB

Deviation = 67.5 kHz, pilot deviation = 6.75 kHz

Stereo THD

Stereo modulation (L = 1, R = 0),

—

0.1

0.2

%

Deviation = 67.5 kHz, pilot deviation = 6.75 kHz

Pilot Signal

Rejection1

RDS Sensitivity1

Stereo modulation (L = 1, R = 0),

—

Deviation = 67.5 kHz, pilot deviation = 6.75 kHz

f = 2 kHz, RDS BLER < 5%

—

RDS Synchronization

f = 2 kHz

—

Time1

RF input = 60 dBµV

RDS PI Lock Time1

f = 2 kHz

—

RF input = 60 dBµV

55

—

dB

13

14.5

dBµV

70

—

ms

85

—

ms

Notes:

1. Guaranteed by characterization.

2. Measured at TAMB = 25 °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

13

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