ADF4108: PLL Frequency Synthesizer
The ADF4108 frequency synthesizer can be used to implement local oscillators in the up-conversion and down-conversion sections of wireless receivers and transmitters. It consists of a low-noise digital PFD (phase frequency detector), a precision charge pump, a programmable reference divider, programmable A and B counters, and a dual-modulus prescaler (P/P + 1). The A (6-bit) and B (13-bit) counters, in conjunction with the dual-modulus prescaler (P/P + 1), implement an N divider (N = BP + A). In addition, the 14-bit reference counter (R counter), allows selectable REFIN frequencies at the PFD input. A complete PLL (phase-locked loop) can be implemented if the synthesizer is used with an external loop filter and VCO (voltage controlled oscillator). Its very high bandwidth (8GHz) means that frequency doublers or prescalers can be eliminated in many high frequency systems, simplifying system architecture and reducing cost.
产品应用领域 Applications
- Broadband wireless access
- Satellite systems
- Instrumentation
- Wireless LANs
- Base stations for wireless radio
ADF4108 特点
- 8.0 GHz bandwidth
- 3.2 V to 3.6 V power supply
- Separate charge pump supply (VP) allows extended tuning voltage in 3.3 V systems
- Programmable, dual-modulus prescaler 8/9, 16/17, 32/33, or 64/65
- Programmable charge pump currents
- Programmable antibacklash pulse width
- 3-wire serial interface
- Analog and digital lock detect
- Hardware and software power-down mode
- Loop filter design possible with ADIsimPLL
- 4 mm × 4 mm, 20-lead chip scale package
ADF4108 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADF4108BCPZ | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| ADF4108BCPZ-RL | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| ADF4108BCPZ-RL7 | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| EVAL-ADF4108EBZ1 | 量产 | 评估板 | - | 待定 |
ADF4108 应用技术支持与电子电路设计开发资源下载
- ADF4108 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