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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
FM Mixer Inputs: Pins FMXIP, FMXIN
Maximum RF Input
Voltage 3
Mixer Input
Resistance 3
Mixer Input
Capacitance 3
IP3 4,5,6
1 dB compression point of mixer
Blockers at 400/800 kHz offset,
—
—
—
—
112
8
6
123
—
—
—
—
dBμV
k ?
pF
dBμV
Max Gain (AGC disabled)
Sensitivity 5,6
Audio SINAD = 26 dB
—
3.5
—
dBμV
Max Gain (AGC disabled)
FM Resistor Banks: FMAGC1, FMAGC2
FMAGC1 Min
FMAGC1 Max
—
—
2.5
800
—
—
?
?
FMAGC1 Step Size
FMAGC2 Min
FMAGC2 Max
FMAGC2 Step Size
Maximum parallel resistance change
Maximum parallel resistance change
—
—
—
—
800
2.5
800
800
—
—
—
—
?
?
?
?
FM LNA: Pins FMI, FMO
Single Receiver Mode
FMI Input
Resistance 3,7
FMI Input
Capacitance 3
—
—
50
2
—
—
?
pF
FMI Return Loss 3
FMI Input Referred
Noise 3
FMI LNA IP3 3,8
64 MHz < F < 108 MHz
Blockers at 400/800 kHz offset, Max Gain
—
—
—
15
0.73
128
—
—
—
dB
nV/ Hz
dBμV
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.
14
Rev. 0.9
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