SI4770-77-A20 Datasheet, PDF (12/54 Pages) Silicon Laboratories – HIGH-PERFORMANCE CONSUMER ELECTRONICS

Si4770/77-A20
Table 7. FM Receiver Characteristics
(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
Input Frequency
Frequency Step
Resolution
Powerup Time^1,2
Tune time¹
Seek Time/Channel¹
Max Frequency
Deviation¹
RF AGC Range
AGC Gain
Resolution³
RF AGC Threshold
Accuracy³
IF AGC Threshold
Accuracy³
Test Condition
RCLK or Crystal = 36.4 MHz, 37.8 MHz,
37.209375 MHz
At LOUT and ROUT pins
Audio THD <1%,
over-deviation handling enabled
Min Typ Max
64
—
108
10
—
200
—
—
100
—
1.5
—
—
20
—
—
150
—
—
40
—
—
2
—
2
—
1
—
Following FM Receiver Specifications Refer to Si4770/77-A20 Application Circuit Input
Unit
MHz
kHz
ms
ms
ms
kHz
dB
dB
dB
dB
IP3⁶
Sensitivity⁶
Blockers at 400/800 kHz offset
AGC disabled (Max RF gain)
Audio SINAD = 26 dB
AGC disabled (Max RF gain)
115 117
—
—
–3.5
–2
dBµV
dBµV
Image Rejection¹
Deviation = 22.5 kHz
65
70
—
dB
Adjacent Channel
Audio SINAD = 26 dB
63
65
—
dB
Rejection^1,6
Desired = 40dBµV, F_MOD = 1 kHz,
F_DEV = 22.5 kHz
Undesired at ±100 kHz offset, F_MOD = 400 Hz,
F_DEV = 22.5 kHz
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.
12
Rev. 0.9