SI4777-A20-GM【PDF 25/54 页】IC RCVR AM/FM CE HD-RADIO TUNER

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Si4770/77-A20

4.2. Clocking

The Si4770/77-A20 generates all internal clocking from

an external crystal using an on-chip oscillator or an

external programmable reference clock. The reference

clock of Si4770/77-A20 is a sinusoidal or rectangular

clock provided by an external source on pin RCLK. The

4.3. Tuning

The Si4770/77-A20 includes a complete on-chip PLL-

VCO frequency synthesizer to generate the quadrature

LO input to the image-reject AM and FM mixers. The

Si4770/77-A20 employs a single-conversion mix (down

conversion) to a fixed low IF center frequency. An

supported crystal and external clock source frequencies

innovative high-performance

image reject mixer

are selected frequencies in the 36–38 MHz range.

The power up command enables the selection of an

external crystal or reference clock. The reference clock

and/or crystal accuracy should be ±100 ppm. In a multi-

receiver system, a single crystal can be shared between

all Si4770/77-A20 receivers. The Si4770/77-A20 family

features programmable loading capacitors for the on-

chip crystal oscillator, eliminating external loading

capacitors.

architecture allows for IF center frequencies below

300 kHz, thereby eliminating ceramic filters required in

10.7 MHz IF tuner architectures. The tune command

automatically programs the LO frequency to the center

of the desired channel plus (minus) the output center IF

frequency when using a high-side (low-side) mix. The

Si4770/77-A20 supports 50, 100, or 200 kHz channel

spacing for FM, 9 or 10 kHz for AM.

CLK

CLK

Si477x

Audio Receiver 1

Si477x

Audio Receiver 2

Figure 8. Xtal Share between Two Tuners

Rev. 0.9

25

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