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| 型号： | SI4770-A20-GM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 26/54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 |
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Si4770/77-A20
4.4. FM Receiver Front-End
The Si4770/77-A20 provides a very flexible front-end
interface to accommodate a wide range of applications
from cost-sensitive to high-performance.
An advanced AGC on the Si4770/77-A20 is
implemented with the use of internal RF peak and IF
peak detectors with programmable thresholds (trip
points). The AGC adjusts the resistor values
automatically. Attack and release rates for the AGC are
programmable, providing flexible fast attack and slow
release AGC performance.
FMXIP
FMXIN
RF Pkd
For cost-effective performance and superior FM
sensitivity, the antenna output can be received on the
FMI pin (Figure 9). The FM band can be received on the
FMI pin via an input coupling network. This input
coupling network isolates the FM band for best
performance. An internal LNA provides gain for the
signal. The LNA output is routed externally to the FM
50 ?
RFREG
FMO
FMI
Reg
R L
LNA
RF Pkd
Si477x
mixer input pins. The LNA gain is regulated with an
internal voltage regulator supply via an internal resistor
bank, R L . The AGC circuit automatically controls the
LNA gain, resistor banks FMAGC1, FMAGC2, and R L to
optimize sensitivity and strong signal handling.
FMXIP
Figure 10. Conceptual Illustration of the
Lowest-Cost Configuration
4.4.1. FMI LNA for FM Loop-Through Usage
In dual receiver applications, two receivers (Figure 11)
can be attached to a single antenna. The dual receiver
solution allows for independent radio station listening in
different rooms.
The FMI LNA input impedance is software-configurable
and provides two options: 50 ? and 100 ? . Configuring
the input impedance for 100 ? facilitates a Si4770/77-
A20 receiver 1 and the Si4770/77-A20 receiver 2 to be
interfaced to the antenna output in parallel, providing a
matched 50 ? input impedance. AGC is coordinated
between both receivers whereby the resistor banks,
FMXIN
RFREG
R L
RF Pkd
Reg
FMAGC1, FMAGC2, and R L , from one receiver are
used to optimize sensitivity and strong signal handling.
50 ?
FMO
FMI
LNA
RF Pkd
Si477x
Figure 9. Conceptual Illustration of the Use of
the FMI LNA for Cost-Optimized and Superior
FM Sensitivity Performance
Cost can be further reduced by eliminating the 1:1 balun
and directly interfacing the signal to the FM mixer by
programming the mixer for single-ended input mode
(Figure 10). The trade-off is a drop in linearity of 6 dBμV
in IP3.
26
Rev. 0.9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| Si4770-A20-GMR | 功能描述:射频接收器 Cons. Elect. Pro-Aud AM/FM RDS Rx RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
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| Si4770Module-A-EVB | 功能描述:射频开发工具 Hi-Performance CE AM/FM Module RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| SI4774DY | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:N-Channel 30 V (D-S) MOSFET with Schottky Diode |
| Si4774DY-T1-GE3 | 功能描述:MOSFET 30 Volts 16 Amps 5 Watts RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube |
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