- 您现在的位置：买卖IC网 > Datasheet目录517 > SM1212E433 (Semtech)RF EVAL FOR SX1212 433MHZ ISM Datasheet资料下载
参数资料
| 型号： | SM1212E433 |
| 厂商： | Semtech |
| 文件页数： | 15/77页 |
| 文件大小： | 0K |
| 描述： | RF EVAL FOR SX1212 433MHZ ISM |
| 标准包装： | 1 |
| 类型： | 收发器，ISM |
| 频率： | 433MHz |
| 适用于相关产品： | SX1212E |
| 已供物品： | 模块，天线，电源，软件 |
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页当前第15页第16页第17页第18页第19页第20页第21页第22页第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页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页
SX1212
ADVANCED COMMUNICATIONS & SENSING
With the recommended Bill Of Materials (BOM) of the reference design of section 7.5.3, the PLL prototype is the
following:
64 ≤ R ≤ 169
S < P+1
PLLBW = 15 kHz nominal
Startup times and reference frequency spurs as specified.
3.2.5. Voltage Controlled Oscillator
The integrated VCO requires only two external tank circuit inductors. As the input is differential, the two inductors
should have the same nominal value. The performance of these components is important for both the phase noise
and the power consumption of the PLL. It is recommended that a pair of high Q factor inductors is selected. These
should be mounted orthogonally to other inductors (in particular the PA choke) to reduce spurious coupling
between the PA and VCO. In addition, such measures may reduce radiated pulling effects and undesirable
transient behavior, thus minimizing spectral occupancy. Note that ensuring a symmetrical layout of the VCO
inductors will further improve PLL spectral purity.
For best performance wound type inductors, with tight tolerance, should be used as described in section 7.5.3.
3.2.5.1. SW Settings of the VCO
To guarantee the optimum operation of the VCO over the SX1212’s frequency and temperature ranges, the
following settings should be programmed into the SX1212:
Target channel
(MHz)
Freq_band
300-
330
000
320-
350
001
350-
390
010
390-
430
011
430-
470
100
470-
510
101
Table 10: MCParam_Freq_band Setting
3.2.5.2. Trimming the VCO Tank by Hardware and Software
To ensure that the frequency band of operation may be accurately addressed by the R, P and S dividers of the
synthesizer, it is necessary to ensure that the VCO is correctly centered. Note that for the reference design (see
section 7.5) no centering is necessary. However, any deviation from the reference design may require the
optimization procedure, outlined below, to be implemented. This procedure is simplified thanks to the built-in VCO
trimming feature which is controlled over the SPI interface. This tuning does not require any RF test equipment,
and can be achieved by simply measuring Vtune, the voltage between pins 6 (LFM) and 7 (LFP).
The VCO is centered if the voltage is within the range:
100 ≤ Vtune ( mV ) ≤ 200
Note that this measurement should be conducted when in transmit mode at the center frequency of the desired
band (for example ~315 MHz in the 300-330 MHz band), with the appropriate MCParam_Freq_band setting.
If this inequality is not satisfied then adjust the MCParam_VCO_trim bits from 00 whilst monitoring Vtune. This
allows the VCO voltage to be trimmed in + 60 mV increments. Should the desired voltage range be inaccessible,
the voltage may be adjusted further by changing the tank circuit inductance value. Note that an increase in
inductance will result in an increase Vtune.
Rev 2 – June 18th, 2009
Page 15 of 77
www.semtech.com
相关PDF资料 |
PDF描述 |
|---|---|
| SM1230E868 | BOARD EVAL XMITTER FOR SX1230 |
| SM16S-CM012-012 | SYNJET ZFLOW 50 PWM 12V |
| SM200P81 | RF MODULE 250/500MBPS 2.4GHZ SMA |
| SM2440G | LAMP T2 TELEPHONE SLIDE 24V .04A |
| SM3020G | LAMP T2 TELEPHONE SLIDE 30V .02A |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SM-1220M | 制造商: 功能描述: 制造商:undefined 功能描述: |
| SM12-3/16-BLK-200FT | 制造商:SUMITOMO 功能描述:177-10101 SM12 3/16 BLK SPL |
| SM12-3/4-WHT-200FT | 制造商:SUMITOMO 功能描述:SM12-3/4-WHT-200FT 制造商:SUMITOMO 功能描述:177-10189 SM12 3/4 WHT SPL |
| SM12-3/8-BLK-200FT | 制造商:Sumitomo Wiring Systems LTD 功能描述:177-10107 SM12 3/8 BLK SPL |
| SM1230E868 | 功能描述:BOARD EVAL XMITTER FOR SX1230 RoHS:否 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
发布紧急采购，3分钟左右您将得到回复。