ADF4252: Lowest Phase Noise PLL Synthesizer using Fractional-N Technology
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
ADF4252 特点
- Sigma-delta based fractional-N technology ensures superior Phase Noise and spurious performance is maintained over temperature
- Flexibility of programmable fractional-modulus ensures exact output frequencies can be synthesized.
- 0.1 - 3.0GHz Fractional-N / 0.05 - 1.2GHz Integer-N PLL's
- 3 wire Serial Interface with 1.8V logic compatibility
- 250MHz REFIN Frequency
- 8 x Programmable charge pump currents
- PFD frequencies up to 30MHz allow faster settling and lower phase noise.
- Supported on ADIsimPLL software design tool
- Available in 4x4mm Chipscale package
- 2.7 - 3.3V Power Supply with separate VP to 5V
ADF4252 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADF4252BCP | 量产 | 24 ld LFCSP (4x4mm w/2.10mm EP) | 24 | 工业 |
| ADF4252BCP-REEL | 量产 | 24 ld LFCSP (4x4mm w/2.10mm EP) | 24 | 工业 |
| ADF4252BCP-REEL7 | 量产 | 24 ld LFCSP (4x4mm w/2.10mm EP) | 24 | 工业 |
| ADF4252BCPZ | 量产 | 24 ld LFCSP (4x4mm w/2.10mm EP) | 24 | 工业 |
| ADF4252BCPZ-R7 | 量产 | 24 ld LFCSP (4x4mm w/2.10mm EP) | 24 | 工业 |
| ADF4252BCPZ-RL | 量产 | 24 ld LFCSP (4x4mm w/2.10mm EP) | 24 | 工业 |
| EVAL-ADF4252EBZ1 | 量产 | 评估板 | - | 工业 |
| EVAL-ADF4252EBZ2 | 量产 | 评估板 | - | 工业 |
ADF4252 应用技术支持与电子电路设计开发资源下载
- ADF4252 数据手册DataSheet 下载 . PDF
- ADI 模拟器件公司比较器产品选型指南 . PDF
- Analog Devices, Inc. 美国模拟器件公司产品订购手册 .PDF
- 时钟和定时IC产品介绍 . PDF