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adrf6755 本振输出才-50dbm,是怎么回事,寄存器配置有问题吗?参考时钟是10MHz

hailong 在 2017-7-30 詢問的問題
最後回覆由EmmaChen於2017-8-1提供

#define CR30 0x00   // Set the attenuator to 0 dB gain.

#define CR29 0x81   // The modulator is powered down.    2017.7.30:  0x80

#define CR28 0x08   // RFDIV depends on the value of the LO frequency to be used

                    // and is set according to Table 6. Note that Register CR28,

                    // Bit 3, is set to 1.

#define CR27 0x10   // Bit 4 depends on the LO frequency to be used and is set

                    // according to Table 6

#define CR26 0x00   // Reserved register.

#define CR25 0x32   // the autocalibration timer.This setting applies for

                    // PFD = 40 MHz. For other PFDs,refer to Equation 3 in the

                    // VCO Autocalibration section.

#define CR24 0x18   // Enable autocalibration.

#define CR23 0x70   // Enable the lock detector and choose the recommended lock

                    // detect timing. This setting applies to PFD = 40 MHz.

                    // For other PFDs, refer to the Lock Detect (LDET) section

                    //in the Program Modes section.

#define CR22 0x80

#define CR21 0x00

#define CR20 0x00

#define CR19 0x80

#define CR18 0x60

#define CR17 0x00

#define CR16 0x00

#define CR15 0x00

//#define CR14 0x00   // Stop LO when TXDIS = 1.

#define CR14 0x00   // Stop LO when TXDIS = 1.

#define CR13 0xE8   // This setting applies to PFD =40 MHz. For other PFDs,

                    // refer to the Lock Detect (LDET) section in the Program

                    // Modes section.

#define CR12 0x18   // Power up the PLL.

#define CR11 0x00

#define CR10 0x20   // Refer to the Reference Input Path section, in particular

                    // Equation 1.

#define CR09 0xF0   // With the recommended loop filter component values and

                    // RSET = 4.7 k?, as shown in Figure 70, the charge pump

                    // current is set to 5 mA for a loop bandwidth of 100 kHz.

#define CR08 0x00

#define CR07 0x00   // Set according to Equation 2 in the Theory of Operation

                    // section. Also, set the MUXOUT pin to tristate.

#define CR06 0x4B   // Set according to Equation 2 in the Theory of Operation section.

#define CR05 0x00   // Refer to the Reference Input Path section, in particular Equation 1.

#define CR04 0x01   //

#define CR03 0x05   // Set according to Equation 2 in the Theory of Operation section.

#define CR02 0x87   // Set according to Equation 2 in the Theory of Operation section.

#define CR01 0x0A   // Set according to Equation 2 in the Theory of Operation section.

#define CR00 0x3D   // Set according to Equation 2 in the Theory of Operation section.

                    // Register CR0 must be the last register written for all

                    // the double-buffered bit writes to take effect.

結果