SX1223SK868【PDF 9/25 页】KIT STARTER FOR XE1223 868MHZ

您好，
买卖IC网欢迎您。
请登录
免费注册

5页 6页 7页 8页 [9页]10页 11页 12页 13页

SX1223

the user according to the selected frequency band, whereas the three VCO_IB bits can be either forced by the user

or set automatically by the circuit which will select the combination having the best phase noise. This automatic

setting can be enabled by setting the three VCO_IB bits to ‘0’.

Table 2 lists the bias setting used for the different VCO_freq settings in automatic mode. When any of the VCO_IB

bit is set to 1, it will overrule the automatic setting.

RF frequency

425/850 MHz

434/868 MHz

457/915 MHz

475/950 MHz

VCO_IB2

1

1

0

0

VCO_IB1

1

0

1

0

VCO_IB0 VCO_freq1 VCO_freq0

1 0 0

1 0 1

1 1 0

0 1 1

Table 2 : VCO bit settings.

The bias bits optimize the phase noise, and the frequency bits control a capacitor bank in the VCO. The tuning

range, the RF frequency versus varactor voltage, is dependent on the VCO frequency setting, and is shown in

Figure 3. When the tuning voltage is in the range from 1 to 1.6V, the VCO gain is at its maximum, approximately 65-

70 MHz/V. It is then recommended that the varactor voltage is kept as much as possible in this range.

VCO gain

Vdd=3.3V, LDO_en=1, VCO_IB=0

Freq [MHz]

1040

1020

1000

980

960

940

920

900

880

860

840

820

800

VCO_freq=11

VCO_freq=10

VCO_freq=01

VCO_freq=00

0

0.5

1

1.5

2

2.5

Vvaractor [V]

Figure 3 : RF frequency vs. varactor voltage and VCO frequency bit

The input capacitance at the varactor pin must be taken into considerations when designing the PLL loop filter. This

can be critical when designing a loop filter with high bandwidth, which gives relatively small component values. The

input capacitance is approximately 6 pF.

For test purposes, the VCO can be bypassed by applying a differential local oscillator (LO) signal to the device on

pin CPOUT and VARIN. A resistor of 18 k

to ground and a series capacitor of 47 pF are needed on both pins for

proper biasing. The register bit VCO_by must be set to ‘1’.

? Semtech 2007

9

www.semtech.com

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

我的联系方式

*

*

*

相关PDF资料

SX1231-31SKB915 TVS

SX1240SKA433 TVS

SX1701BI085TRT IC AMP 2.5GHZ 5.3V 16-MLPQ

TA002-10002 LED HEATSINK W/FAN 12V 40X10MM

TC620HEPA IC TEMP SNSR 5V DUAL TRIP 8-DIP

TC623CVOA713 IC TEMP SNSR 3V DUAL TRIP 8-SOIC

TC624VOA IC TEMP SNSR PROG 2.7V 8SOIC

TC6501P125VCTTRG IC TEMP SWTCH OPEN DRAIN SOT23A5

相关代理商/技术参数

SX1223SK915 功能描述:KIT STARTER FOR XE1223 915MHZ RoHS:是类别: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

SX1230 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Integrated Transmitter IC Narrow/wideband 315 MHz, 434 MHz 868 MHz and 915 MHz band Transmitter

SX1230-11SKA433 制造商:Semtech Corporation 功能描述:Evaluation Kit For SX1230-11SKA 433 mHz (SX1230SKA /SX1211SKA board) Transmitter

SX1230-11SKA868 制造商:Semtech Corporation 功能描述:NARROW/WIDEBAND RF TRANSMITTER 868MHZ

SX1230-11SKA915 制造商:Semtech Corporation 功能描述:NARROW/WIDEBAND RF TRANSMITTER 915MHZ 制造商:Semtech Corporation 功能描述:Evaluation Kit For SX1230-11SKA 915 mHz (SX1230SKA /SX1211SKA board)

SX1230-12SKA433 制造商:Semtech Corporation 功能描述:USB KIT - SX1230 433MHZ 制造商:Semtech Corporation 功能描述:Deluxe USB Starter Kit for SX1230, Includes Two USB Interface Boards at 433MHz

SX1230I066TRT 功能描述:IC TX UHF 433/868/916 MHZ 24-QFN RoHS:是类别:RF/IF 和 RFID >> RF 发射器系列:- 标准包装:4,000 系列:- 频率:310MHz ~ 440MHz 应用:- 调制或协议:UHF，ASK 数据传输率 - 最大:20 kBaud 功率 - 输出:1dBm ~ 5dBm 电流 - 传输:10mA 数据接口:PCB，表面贴装天线连接器:PCB，表面贴装存储容量:- 特点:- 电源电压:2.2 V ~ 4 V 工作温度:-40°C ~ 85°C 封装/外壳:16-LSSOP（0.154"，3.90mm 宽）包装:带卷 (TR)

SX1230SKA 制造商:Semtech Corporation 功能描述: