- 您现在的位置：买卖IC网 > PDF目录18780 > SI4739-C40-GMR (Silicon Laboratories Inc)IC RX FM/WB RAD RDS/RBDS 20UQFN PDF资料下载
参数资料
| 型号： | SI4739-C40-GMR |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 23/42页 |
| 文件大小： | 0K |
| 描述： | IC RX FM/WB RAD RDS/RBDS 20UQFN |
| 标准包装： | 2,500 |
| 频率： | 520kHz ~ 1.71MHz，64MHz ~ 108MHz，162.4MHz ~ 162.55MHz |
| 调制或协议： | AM，FM，WB |
| 应用： | 通用 |
| 电流 - 接收： | 19.9mA |
| 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： | 2.7 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 封装/外壳： | 20-UFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（3x3） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页当前第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页
Si4736/37/38/39-C40
5.7. Stereo Audio Processing
The output of the FM demodulator is a stereo
multiplexed (MPX) signal. The MPX standard was
developed in 1961, and is used worldwide. Today's
MPX signal format consists of left + right (L+R) audio,
left – right (L–R) audio, a 19 kHz pilot tone, and
RDS/RBDS data as shown in Figure 13 below.
5.9. Stereo DAC
High-fidelity stereo digital-to-analog converters (DACs)
drive analog audio signals onto the LOUT and ROUT
pins. The audio output may be muted. Volume is
adjusted digitally with the RX_VOLUME property.
5.10. Soft Mute
The soft mute feature is available to attenuate the audio
outputs and minimize audible noise in very weak signal
conditions. The softmute attenuation level is adjustable
Mono Audio
Left + Right
Stereo
Pilot
Stereo Audio
Left - Right
RDS/
RBDS
using the FM_SOFT_MUTE_MAX_ATTENUATION and
AM_SOFT_MUTE_MAX_ATTENUATION properties.
5.11. RDS/RBDS Processor
(Si4737/39 Only)
The Si4737/39 implements an RDS/RBDS* processor
0
15 19 23
38
53
57
for symbol decoding, block synchronization, error
Frequency (kHz)
Figure 13. MPX Signal Spectrum
5.7.1. Stereo Decoder
The Si4736/37/38/39's integrated stereo decoder
automatically decodes the MPX signal using DSP
techniques. The 0 to 15 kHz (L+R) signal is the mono
output of the FM tuner. Stereo is generated from the
(L+R), (L–R), and a 19 kHz pilot tone. The pilot tone is
used as a reference to recover the (L–R) signal. Output
left and right channels are obtained by adding and
subtracting the (L+R) and (L–R) signals respectively.
The Si4731 uses frequency information from the 19 kHz
stereo pilot to recover the 57 kHz RDS/RBDS signal.
5.7.2. Stereo-Mono Blending
Adaptive noise suppression is employed to gradually
combine the stereo left and right audio channels to a
mono (L+R) audio signal as the signal quality degrades
to maintain optimum sound fidelity under varying
reception conditions. Stereo/mono status can be
monitored with the FM_RSQ_STATUS command. Mono
operation can be forced with the
FM_BLEND_MONO_THRESHOLD property.
5.8. De-emphasis
Pre-emphasis and de-emphasis is a technique used by
FM broadcasters to improve the signal-to-noise ratio of
FM receivers by reducing the effects of high-frequency
interference and noise. When the FM signal is
transmitted, a pre-emphasis filter is applied to
accentuate the high audio frequencies. The
Si4736/37/38/39 incorporates a de-emphasis filter
which attenuates high frequencies to restore a flat
frequency response. Two time constants are used in
various regions. The de-emphasis time constant is
programmable to 50 or 75 μs and is set by the
FM_DEEMPHASIS property.
detection, and error correction.
The Si4737/39 device is user configurable and provides
an optional interrupt when RDS is synchronized, loses
synchronization, and/or the user configurable RDS
FIFO threshold has been met.
The Si4737/39 reports RDS decoder synchronization
status and detailed bit errors in the information word for
each RDS block with the FM_RDS_STATUS command.
The range of reportable block errors is 0, 1–2, 3–5, or
6+. More than six errors indicates that the
corresponding block information word contains six or
more non-correctable errors or that the block checkword
contains errors.
*Note: RDS/RBDS is referred to only as RDS throughout the
remainder of this document.
5.12. Tuning
The tuning frequency is directly programmed using the
FM_TUNE_FREQ, WB_TUNE_FREQ, and
AM_TUNE_FREQ commands. The Si4736/37/38/39
supports channel spacing steps of 10 kHz in FM mode,
25 kHz in WB mode, and 1 kHz in AM mode.
Rev. 1.0
23
相关PDF资料 |
PDF描述 |
|---|---|
| SI4739-C40-GUR | IC RX FM/WB RAD RDS/RBDS 24SSOP |
| IXTP90N075T2 | MOSFET N-CH 75V 90A TO-220 |
| SI4738-C40-GMR | IC RX FM/WB RADIO 20UQFN |
| SI4738-C40-GUR | IC RX FM/WB RADIO 24SSOP |
| SI4330-B1-FMR | IC RX ISM 240-960MHZ 20VQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| Si4739-C40-GU | 功能描述:射频接收器 BC FM/WB Radio Receiver w/RDS/RBDS 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 |
| SI4739-C40-GUR | 功能描述:射频接收器 Broadcast FM/WB Recvr w/RDS/RBDS 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 |
| SI4740 | 制造商:SILABS 制造商全称:SILABS 功能描述:Automotive AM/FM Radio Receiver |
| SI4740-C10-GM | 功能描述:IC TUNER AM/FM CAR RADIO 24QFN RoHS:是 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| SI4740-C10-GMR | 制造商:Silicon Laboratories Inc 功能描述:SI4740-C10-GM AM/FM AUTOMOTIVE RADIO RX - Tape and Reel 制造商:Silicon Laboratories Inc 功能描述:IC TUNER AM/FM CAR RADIO 24QFN |
发布紧急采购，3分钟左右您将得到回复。