SI4770 查看數據表（PDF） - Silicon Laboratories

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SI4770

HIGH-PERFORMANCE CONSUMER ELECTRONICS BROADCAST RADIO RECEIVER AND HD RADIO TUNER

Silicon Laboratories 

Si4770/77-A20

Table 7. FM Receiver Characteristics

(TAMB = –40 to 85 °C, VA = 4.5 to 5.5 V, VD = 2.7 to 3.6 V, VIO1 = 1.7 to 3.6 V, VIO2 = 1.2 to 3.6 V. Typical values measured at

TAMB = 25 °C, FM modulation (L = R), FMOD = 1 kHz, FDEV = 22.5 kHz, Deemphasis = 75 µsec, RF level = 60 dBµV, and

FRF = 98 MHz in application circuit unless otherwise specified)

Parameter

Input Frequency

Frequency Step

Resolution

Powerup Time1,2

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

Rejection1,6

Desired = 40dBµV, FMOD = 1 kHz,

FDEV = 22.5 kHz

Undesired at ±100 kHz offset, FMOD = 400 Hz,

FDEV = 22.5 kHz

Notes:

1. Guaranteed by characterization.

2. Measured at TAMB = 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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