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[原创] ADI ADF4372微波宽带(62.5 MHz-16 GHz)PLL频率合成方案

关键词:无线通信 频率合成器 5G通信 ADF4372

时间:2019-10-21 13:52:49       来源:中电网

ADI公司的ADF4372是微波宽带小数N和整数N的PLL频率合成器,RF输出频率范围为62.5 MHz至 16,000 MHz,高分辨率39位小数模数,典型杂散fPFD为-90dBc,1 kHz至100MHz的集成 RMS 抖动为38 fs,fPFD工作频率达250MHz,基准输入频率达600MHz,可编程的1/2/4/8/16/32或64分频输出,RF8x和RFAUX8x具有62.5 MHz至8,000MHz的输出,RF16x具有8,000MHz至16,000MHz 的输出,模拟和数字电源为3.3 V,VCO电源电压为3.3V和5V,RF输出静音功能,7mm×7mm 48端子LGA封装.主要用在无线基础设备(移动通信多载波全球系统(MC-GSM),5G),测试设备和仪表,时钟发生器,航天与国防.本文介绍了ADF4372主要特性,功能框图,以及评估板EV-ADF4372SD2Z主要特性,建立图,电路图,材料清单和PCB设计图.

The ADF4372 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers when used with an external loop filter and an external reference frequency. The wideband microwave voltage controlled oscillator (VCO) design allows frequencies from 62.5 MHz to 16 GHz to be generated.

The ADF4372 has an integrated VCO with a fundamental output frequency ranging from 4000 MHz to 8000 MHz. In addition, the VCO frequency is connected to a divide by 1, 2, 4, 8, 16, 32, or 64 circuit that allows the user to generate radio frequency (RF) output frequencies as low as 62.5 MHz at RF8x. A frequency multiplier at RF16x generates from 8 GHz to 16 GHz. RFAUX8x duplicates the frequency range of RF8x or permits direct access to the VCO output. To suppress the unwanted products of frequency multiplication, a harmonic filter exists between the multiplier and the output stage of RF16x.

Control of all on-chip registers is through a 3-wire interface. The ADF4372 operates with analog and digital power supplies ranging from 3.15 V to 3.45 V, and 5 V for the VCO power supply. The ADF4372 also contains hardware and software power-down modes.

ADF4372主要特性:

RF output frequency range: 62.5 MHz to 16,000 MHz
Fractional-N synthesizer and integer-N synthesizer
High resolution 39-bit fractional modulus
Typical spurious fPFD: −90 dBc
Integrated rms jitter: 38 fs (1 kHz to 100 MHz)
Normalized phase noise floor: −234 dBc/Hz
fPFD operation to 250 MHz
Reference input frequency operation to 600 MHz
Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output
62.5 MHz to 8,000 MHz output at RF8x and RFAUX8x
8,000 MHz to 16,000 MHz output at RF16x
Lock time approximately 3 ms with automatic calibration
Lock time <30 μs with autocalibration bypassed, typical
Analog and digital power supplies: 3.3 V typical
VCO supply voltage: 3.3 V and 5 V
RF output mute function
7mm × 7mm, 48-terminal LGA package

ADF4372应用:

Wireless infrastructure (multicarrier global system for mobile communication (MC-GSM), 5G)
Test equipment and instrumentation
Clock generation
Aerospace and defense

图1.ADF4372功能框图

评估板EV-ADF4372SD2Z

The EV-ADF4372SD2Z evaluates the performance of the ADF4372 frequency synthesizer with an integrated voltage controlled oscillator (VCO) for phase-locked loops (PLLs). A photograph of the evaluation board is shown in Figure 1. The evaluation board contains the ADF4372 frequency synthesizer with an integrated VCO, a USB interface, power supply connectors, and subminiature Version A (SMA) connectors.The EV-ADF4372SD2Z requires an SDP-S board (not supplied with the kit). The SDP-S allows software programming of the EV-ADF4372SD2Z. Full specifications for the ADF4372 frequency synthesizer are available in the product data sheet, which must be consulted in conjunction with this user guide when working with the evaluation board.

评估板EV-ADF4372SD2Z主要特性:

Self contained board, including ADF4372 frequency
synthesizer with integrated VCO, loop filter (180 kHz),
USB interface, and voltage regulators
Windows-based software allows control of synthesizer functions from a PC
Externally powered by 6 V
EVALUATION KIT CONTENTS
EV-ADF4372SD2Z evaluation board

图2.评估板EV-ADF4372SD2Z外形图

图3.评估板EV-ADF4372SD2Z建立图

图4.评估板EV-ADF4372SD2Z电路图:ADF4372连接和回路滤波器

图5.评估板EV-ADF4372SD2Z电路图:5V LDO稳压器

图6.评估板EV-ADF4372SD2Z电路图:3.3V LDO稳压器

图7.评估板EV-ADF4372SD2Z电路图:板连接器
评估板EV-ADF4372SD2Z材料清单:



图8.评估板EV-ADF4372SD2Z PCB设计图:顶层丝印

图9.评估板EV-ADF4372SD2Z PCB设计图:底层丝印

图10.评估板EV-ADF4372SD2Z PCB设计图:层1,主层

图11.评估板EV-ADF4372SD2Z PCB设计图:层2,地

图12.评估板EV-ADF4372SD2Z PCB设计图:层3,电源

图13.评估板EV-ADF4372SD2Z PCB设计图:层4,次要层
详情请见:
https://www.analog.com/media/en/technical-documentation/data-sheets/adf4372.pdf
https://www.analog.com/media/en/technical-documentation/user-guides/EV-ADF4372SD2Z-UG-1548.pdf
adf4372.pdf
EV-ADF4372SD2Z-UG-1548.pdf

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