参数资料
型号: SI4770-A20-GM
厂商: Silicon Laboratories Inc
文件页数: 25/54页
文件大小: 0K
描述: IC RECEIVER AM/FM CE HP
特色产品: Si477x Pro-Audio, High-Performance AM/FM Receiver and HD Radio Tuner
标准包装: 490
频率: 520kHz ~ 1.71MHz,64MHz ~ 108MHz
调制或协议: AM,FM,RDS
应用: 通用
电流 - 接收: 140mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
特点: 配有 RSSI
电源电压: 4.5 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: *
供应商设备封装: *
包装: *
配用: 336-2267-ND - EVAL MODULE AM/FM CE SI4770
336-2269-ND - BOARD EVAL FOR CE AM/FM SI4770
其它名称: 336-2268
SI4770-A10-GM
SI4770-A10-GM-ND
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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