项目中使用LMX2820实现射频信号输出时发现,在多次切换LMX2820配置参数实现信号频率更改后,会出现LMX2820输出信号失锁现象,具体信息如下: (1)LMX2820被设定为工作在手动校准模式下,频率更改时会动态配置VCO_DACISET、VCO_SEL、VCO_CAPCTRL及分频系数;更改配置的时序和间隔满足SPI接口时序要求 (2)出现失锁现象后回读rd_...
Part Number:LMX2820 Can multiple LMX2820 share the same SPI bus with individual chip enable (CE) and chip selects (CS)? In this configuration the SCK, SDI, and MUXOUT pins would be shared across multiple LMX2820 devices and connected to a common master device. Hi Michael, Yes, sharing ...
SPI is same as LMX2594, here is the details. Register structure The LMX2820 is programmed using 24-bit shift registers. The shift register consists of a R/W bit (MSB), followed by a 7-bit address field and a 16-bit data field. For the R/W bit, 0 is for wr...
VCO Cal. Programmed Registers Programmed Program RESET=0 Program RESET=1 Hard Power on Reset Done GND Hard Power on Reset Start Program Registers VCO/ Output Analog PLL Lock Done VCO Calibration Start SPI Interface VCO Calibration Done Analog PLL Lock Start Vcc Pins VCO Calibration Valid Output ...
将SPI 总线连接到 Nucleo 板和 LMX2820EVM 4.重置具有以下程序的 Nucleo 板 uint8_t rb = 0x04;//寄存器地址 Rb = Rb |(1<<8);//设置 MSB HAL_GPIO_WritePin (GPIOF、GPIO_PIN_12、GPIO_PIN_SET);/CS 引脚高电平 HAL_GPIO_WritePin (GPIOF、GPIO_PIN_12、GPIO...
器件型号:LMX2820 工具与软件: 您好! 我的客户需要使用 LMX2820优化 PLL 运行时间。 如果您有任何参考资料可用于优化从上电到 PLL 锁定的总时间、包括 SPI 设置时间、请分享。 如果用户优化了 LMX2820、从上电到 PLL 锁定的最短时间是多少? 谢谢你。 JH 9 个月前 ...
Quick question regarding the LMX2820, what is the default SPI address? I couldn't find it in the register map. Is it just similar to the LMK04832?https://e2e.ti.com/support/clock-and-timing/f/clock-timing-forum/841739/lmk04832-how-to-use-4-wire-spi-mode?tisearch=e2...
MUTE LMX2820 (PINMUTE_POL=0) SPI1 MUTE SPI2 LMX2820 (PINMUTE_POL=1) fOSCIN Output RF Switch Figure 7-5. Output Mute Pins 7.4 Device Functional Modes There are six basic modes of the LMX2820 that allow the choices of the use of internal vs. external VCO and three different ways ...
MUTE LMX2820 (PINMUTE_POL=0) SPI1 MUTE SPI2 LMX2820 (PINMUTE_POL=1) fOSCIN Output RF Switch Figure 7-5. Output Mute Pins 7.4 Device Functional Modes There are six basic modes of the LMX2820 that allow the choices of the use of internal vs. external VCO and three different ways ...
项目中使用LMX2820实现射频信号输出时发现,在多次切换LMX2820配置参数实现信号频率更改后,会出现LMX2820输出信号失锁现象,具体信息如下: (1)LMX2820被设定为工作在手动校准模式下,频率更改时会动态配置VCO_DACISET、VCO_SEL、VCO_CAPCTRL及分频系数;更改配置的时序和间隔满足SPI接口时序要求 (2)出现失锁现象后回读rd_...