SI4770-77-A20 Datasheet, PDF (13/54 Pages) Silicon Laboratories – HIGH-PERFORMANCE CONSUMER ELECTRONICS

Si4770/77-A20
Table 7. FM Receiver Characteristics (Continued)
(T_AMB = –40 to 85 °C, V_A = 4.5 to 5.5 V, V_D = 2.7 to 3.6 V, V_IO1 = 1.7 to 3.6 V, V_IO2 = 1.2 to 3.6 V. Typical values measured at
T_AMB = 25 °C, FM modulation (L = R), F_MOD = 1 kHz, F_DEV = 22.5 kHz, Deemphasis = 75 µsec, RF level = 60 dBµV, and
F_RF = 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, F_MOD = 1 kHz,
F_DEV = 22.5 kHz
Undesired at ±200 kHz offset, F_MOD = 400 Hz,
F_DEV = 22.5 kHz
THD
Mono (S+N)/N⁶
F_DEV = 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 T_AMB = 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
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