The ADF4360-2 is a high-performance phase-locked frequency synthesis chip from Analog Devices, USA. It integrates an integer-N synthesizer and a voltage-controlled oscillator for wireless handheld communication devices, inspection equipment, wireless LAN and cable TV. In the device. The main features of the device are as follows:
â—†The output frequency range is from 1 850 to 2 170 MHz, and supports two-way output. When the two-way output is selected, it can output 925 to 1085 MHz.
â—†The working voltage is 3~3.6 V;
â—†Programmable dual-mode prescaler 8/9, 16/17, 32/33;
â—† programmable output signal power control;
â—† Ability to perform analog and digital lock detection;
â—† Support software and hardware power-down function.
The functional block diagram of the ADF4360-2 is shown in Figure 1. It consists primarily of a 14-bit programmable reference R counter, a 24-bit data register, a 24-bit function latch, a voltage-controlled oscillator, a phase comparator, a lock detector, a multiplexer, and a charge pump.
Through the external frequency source signal and the single-chip control signal, the 14-bit programmable reference R divider divides the external frequency source signal, and then obtains the reference frequency and sends it to the phase detector. The control signal is composed of a clock signal CLK, a data signal DATA, and an enable signal LE. Under the control of CLK, the 24-bit data signal is serially input and temporarily stored in a 24-bit data register. After receiving the enable signal LE, the previously input 24-bit data arrives at the corresponding latch according to the address bit. The main frequency division ratio N of the ADF4360-2 is implemented by a dual-mode prescaler (P/P+1), a programmable 5-bit A counter, and a 13-bit B divider. The algorithm is N=B&TImes; P+A, output. The frequency is fVCO=(B&TImes;P+A)&TImes;fREFIN/R, and the control of the phase-locked loop is realized by setting the control words of the three control word registers A, B, and R. The peripheral of the chip only needs to add a loop filter, and according to the output frequency, the appropriate parameter can be selected to output a relatively stable frequency. The block diagram of the circuit system is shown in Figure 2.
The loop filter network has a low-pass characteristic, which mainly suppresses the carrier frequency component and high-frequency noise in the output voltage of the phase detector, and reduces the parasitic output caused by the impure control voltage of the VCO. The loop filter network shown in Figure 2 can be simulated and designed using the ADI simPLL, a proprietary design and simulation tool from Analog Devices.
3 chip configuration program designIn this circuit design, the PFD input frequency of the ADF4360-2 is 1 MHz, so the reference clock is divided by R=40. From the formula fVCO=(B&TImes;P+A)×fREFIN/R, it can be calculated that N is 11 250, the dual-mode prescaler is set to P/(P+1)=32/33, and the counter A is set to 8, the counter B is set to 32. According to the ADF4360-2 chip data, the three control registers are initialized to the R register 00000A1H, the C register 8FF12CH, and the N register 803E42H. The configuration values ​​are listed in Table 1.
The MCU configures the internal register of the ADF4360-2 by providing the clock signal CLK, the data signal DATA and the enable signal LE, so that the VCO outputs the signal of the desired frequency and is responsible for detecting the lock flag of the ADF4360-2, if the detection is already locked. , the configuration data work is completed. The program flow of the single chip microcomputer is shown in Figure 3.
This paper introduces the output method of designing 1 GHz signal by using phase-locked frequency synthesis chip ADF4360-2, and gives the block diagram of circuit system structure and the program flow of single chip microcomputer. Because the ADF4360-2 integrates the VCO internally, the external writes the control word through the I/O port of the MCU. Therefore, the system has the characteristics of simple peripheral circuit, convenient debugging, low power consumption and low cost, and can be widely used in various circuit systems.
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