SI4777-A20-GM【PDF 15/54 页】IC RCVR AM/FM CE HD-RADIO TUNER

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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

FMO Output

Resistance 3

FMO Output

Capacitance 3

Test Condition

Nominal FMI to FMO gain = 8 dB,

Source load = 50 ?

Min

—

Typ

125

Max

—

Unit

Dual Receiver Mode

FMI Input

Resistance 7,3

FMI Input

Capacitance 3

—

100

1.5

—

FMI Return Loss 3

FMI Input Referred

Noise 3

64 MHz < F < 108 MHz

—

1.20

—

nV/ Hz

FMI LNA IP3

FMO Output

Resistance 3

3,8

Blockers at 400/800 kHz offset, Max Gain

Nominal FMI to FMO gain = 8dB,

Source load = 50 ?

—

126

250

—

dBμV

FMO Output

Capacitance 3

—

Audio Outputs: Pins LOUT and ROUT

Audio Frequency

Response Low 1,2

Audio Frequency

Response High 1,2

Output Load

Resistance 3

Output Load

Capacitance 3

Output Voltage

Power Supply

±3 dB

At LOUT and ROUT pins

Deviation = 22.5 kHz

100 Hz ripple on power supply lines.

—

10 k

—

112

—

125

—

kHz

mVRMS

Rejection Ratio

(PSRR) 3

Ripple voltage = 100 mV PP of power supply

voltage

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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