ADF4252 采用小数N分频技术的最低相位噪声PLL频率合成器

ADF4252: 采用小数N分频技术的最低相位噪声PLL频率合成器

ADF4252 功能框图 ADF4252小数N分频频率合成器与VCO和环路滤波器一起使用时，可构成完整的锁相环(PLL)。这款ADI解决方案可以为无线应用中的RF信号上变频和下变频提供先进的本振(LO)。它可以为射频(RF)和中频(IF)部分提供LO。RF部分运用小数N分频技术，IF部分则使用整数N分频技术。该PLL由低噪声数字鉴频鉴相器(PFD)、精密电荷泵、可编程基准分频器、可编程整数寄存器和可编程模数小数插值器组成。

The ADF4252 Fractional-N Synthesizer when combined with a VCO and loop filter forms a complete phased locked loop (PLL). This solution from ADI creates state-of-the-art LO's (local oscillator) for the upconversion and downconversion of RF signals in Wireless applications. The ADF4252 can provide the LO for both RF and IF sections. The RF section incorporates Fractional-N techniques while the IF section uses integer-N techniques. The ADF4252 PLL consists of a low noise digital phase frequency detector (PFD), a precision charge pump, a programmable reference divider, programmable integer registers. Programmable modulus fractional interpolator.

-103dBc/Hz In-band Phase Noise performance for GSM 1800MHz conditions (as an example) is approximately a 15dB improvement over the ADI best Integer-N PLL Phase Noise (ADF4106) and a 10dB improvement over competing F-N PLL products available today. Fractionality will provide for higher PFD reference which will allow wider loop bandwidth for fast lock times. This product is targeted principally at Handset and infrastructure applications requiring low phase noise, fast settling, small channel steps at high output frequencies.Sales Collateral: Full data sheet with performance graphs and evaluation board and software available, featured on ADIsimPLL Synthesizer software simulation tool

技术特性

Σ-Δ型小数N分频技术确保在整个温度范围内均能保持出色的相位噪声和杂散性能
灵活的可编程小数模数确保能合成精确的输出频率
0.1 - 3.0 GHz小数N分频/0.05 - 1.2 GHz整数N分频PLL
三线式串行接口，1.8 V逻辑兼容性
250 MHz REFIN频率
8x可编程电荷泵电流
最高30 MHz的PFD频率可实现更快的建立时间和更低的相位噪声
受ADIsimPLL软件设计工具支持
提供4x4 mm芯片级封装
2.7 - 3.3 V电源，最高5 V的独立VP

技术指标

Single/Dual: Dual
Max RF Input (MHz): 3000MHz
RF Prescalers: 4/5,8/9
Max REFin (MHz): 250MHz
Norm Phase Noise (dBc/Hz): -214dBc
Supply Current : 13mA
Package: 24-Lead CSP

订购指南

产品型号	封装	引脚	温度范围	包装和数量	报价*(100-499)	报价*1000 pcs	RoHS
ADF4252BCPZ 产品状态: 量产	24 ld LFCSP (4x4mm w/2.10mm EP)	24	工业	Tray, 490	$ 3.14	$ 2.67	Y 材料信息
ADF4252BCPZ-R7 产品状态: 量产	24 ld LFCSP (4x4mm w/2.10mm EP)	24	工业	Reel, 1500	$ 0.00	$ 2.67	Y 材料信息
ADF4252BCPZ-RL 产品状态: 量产	24 ld LFCSP (4x4mm w/2.10mm EP)	24	工业	Reel, 5000	$ 0.00	$ 0.00	Y 材料信息

开发工具

产品型号	描述	报价	RoHS
EVAL-ADF4252EBZ1 产品状态: 量产	Evaluation Board	$ 0.00	是
EVAL-ADF4252EBZ2 产品状态: 量产	Evaluation Board	$ 121.44	是