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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
Test Condition
Min
64
10
Typ
—
—
Max
108
200
Unit
MHz
kHz
Resolution
Powerup Time 1,2
RCLK or Crystal = 36.4 MHz, 37.8 MHz,
—
—
100
ms
37.209375 MHz
Tune time 1
—
1.5
—
ms
Seek Time/Channel
Max Frequency
Deviation 1
RF AGC Range
AGC Gain
Resolution 3
1
At LOUT and ROUT pins
Audio THD <1%,
over-deviation handling enabled
—
—
—
—
20
150
40
2
—
—
—
—
ms
kHz
dB
dB
RF AGC Threshold
Accuracy 3
IF AGC Threshold
Accuracy 3
2
1
—
—
dB
dB
Following FM Receiver Specifications Refer to Si4770/77-A20 Application Circuit Input
IP3 6
Blockers at 400/800 kHz offset
115
117
—
dBμV
AGC disabled (Max RF gain)
Sensitivity 6
Audio SINAD = 26 dB
—
–3.5
–2
dBμV
AGC disabled (Max RF gain)
Image Rejection 1
Adjacent Channel
Rejection 1,6
Deviation = 22.5 kHz
Audio SINAD = 26 dB
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
65
63
70
65
—
—
dB
dB
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
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