类别是'category.时钟发生器' (10000)
- 所有品牌
对比 | 图片 | 产品型号 | 品牌 | 数据表 | 库存 | 价格(含增值税) | 数量 | Rohs | 工厂交货时间 | 触点镀层 | 安装类型 | 包装/外壳 | 表面安装 | 引脚数 | 供应商器件包装 | 材料 | 质量 | Current - Supply (Nom) | 厂商 | 操作温度 | 包装 | 已出版 | 系列 | 尺寸/尺寸 | 容差 | JESD-609代码 | 无铅代码 | 零件状态 | 湿度敏感性等级(MSL) | 终止次数 | ECCN 代码 | 温度系数 | 类型 | 电阻 | 组成 | 应用 | 功率(瓦特) | HTS代码 | 电压 - 供电 | 端子位置 | 峰值回流焊温度(摄氏度) | 端子间距 | Reach合规守则 | 额定电流 | 基本部件号 | 输出量 | 引脚数量 | 输出的数量 | 执行器类型 | 失败率 | 照明电压(标称) | 电路数量 | 极数 | 照明 | 断路器类型 | 数据率 | 输入 | 议定书 | 比率-输入:输出 | 主时钟/晶体频率-名 | 锁相环 | 差分 - 输入:输出 | 驱动器/接收器的数量 | 通信IC类型 | 双工 | 接收器迟滞 | 主要目的 | 除法器/乘法器 | 产品 | 特征 | 座位高度(最大) | 长度 | 宽度 | 板厚 | 辐射硬化 | RoHS状态 | 无铅 | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
![]() | 5P49V5929B000NLGI8 | Renesas Electronics America Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 12 Weeks | 表面贴装 | 24-VFQFN Exposed Pad | 200MHz | Industrial grade | -40°C~85°C | Tape & Reel (TR) | VersaClock® 5 | 活跃 | 1 (Unlimited) | 1.71V~3.465V | LVCMOS | 1 | HCSL, LVCMOS, LVDS, LVPECL, Crystal | 2:4 | 有 | Yes/Yes | Yes/No | ROHS3 Compliant | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | 5P49V5914B000NLGI8 | Renesas Electronics America Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 12 Weeks | 表面贴装 | 24-VFQFN Exposed Pad | 350MHz | Industrial grade | -40°C~85°C | Tape & Reel (TR) | VersaClock® 5 | 活跃 | 1 (Unlimited) | 时钟发生器 | 1.71V~3.465V | HCSL, LVCMOS, LVDS, LVPECL | 1 | HCSL, LVCMOS, LVDS, LVPECL, Crystal | 2:3 | 有 | Yes/Yes | Yes/No | ROHS3 Compliant | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | 8T49N282C-999NLGI8 | Renesas Electronics America Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 12 Weeks | 表面贴装 | 72-VFQFN Exposed Pad | 1GHz | -40°C~85°C | Tape & Reel (TR) | FemtoClock® NG | 活跃 | 3 (168 Hours) | 2.375V~3.465V | LVPECL | 1 | Crystal | 1:8 | 是,带旁通 | No/Yes | Yes/No | ROHS3 Compliant | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | 5P49V5901B669NLGI8 | Renesas Electronics America Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | Bulk | VersaClock® 5 | 活跃 | 1 (Unlimited) | ROHS3 Compliant | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | CY22U1LCALGXI-00 | Cypress Semiconductor Corp | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | Gold | 表面贴装 | 8-UFQFN | YES | 8 | 15mA | 200MHz | -40°C~85°C | Tray | 2009 | UniClock | e4 | yes | Obsolete | 3 (168 Hours) | 8 | EAR99 | 时钟发生器 | 1.8V | QUAD | 260 | 0.4mm | CY22U1 | CMOS | 8 | 1 | CMOS, Crystal | 1:1 | 166MHz | 有 | No/No | Yes/No | 无 | ROHS3 Compliant | 无铅 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
SL23EP09ZC-1H | Silicon Labs | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 6 Weeks | 表面贴装 | 16-TSSOP (0.173, 4.40mm Width) | 16 | 50.008559mg | 42mA | 220MHz | 0°C~70°C | Tube | 2016 | yes | 活跃 | 1 (Unlimited) | 2.3V~3.6V | SL23EP09 | LVCMOS | 16 | 9 | 1 | Clock | 1:9 | 是,带旁通 | No/No | 符合RoHS标准 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5344D-B04894-GM | Skyworks | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 8-WDFN Exposed Pad | 8-TDFN (3x3) | Skyworks Solutions Inc. | Tray | SI5344 | 不用于新设计 | Tape & Reel (TR) | -- | Obsolete | Calibrator | 液晶显示屏 | ISL45042A | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5345B-B08454-GMR | Skyworks | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 8-TSSOP, 8-MSOP (0.118, 3.00mm Width) | 8-MSOP | Skyworks Solutions Inc. | Tape & Reel (TR) | SI5345 | Obsolete | -40°C ~ 85°C | Tape & Reel (TR) | -- | 活跃 | 收发器 | 3 V ~ 5.5 V | ISL32452 | 250kbps | RS422, RS485 | 1/1 | 一半 | 30mV | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SL15300ZC-16CH1 | Skyworks | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | Axial | Axial | Skyworks Solutions Inc. | Tube | Obsolete | -55°C ~ 155°C | Bulk | Holco, Holsworthy | 0.146 Dia x 0.394 L (3.70mm x 10.00mm) | ±0.1% | 活跃 | 2 | ±50ppm/°C | 12.1 Ohms | Metal Film | 0.5W, 1/2W | -- | 脉冲耐压 | -- | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | 5V49EE503-046NLGI8 | Renesas | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | Renesas Electronics America Inc | Bulk | Obsolete | - | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | 5P49V5913A003NLGI8 | Renesas | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | Copper | Compliant | 457 mm | 457 mm | 787.4 µm | 无铅 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5335A-B04711-GM | Skyworks | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 面板安装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | 活跃 | -- | Tray | SI5335 | IEG | 活跃 | -- | -- | Rocker | -- | 3 | -- | Magnetic (Hydraulic Delay) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | GN1406-INE3 | Semtech | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | QFN-56 | 56 | 56-QFN (8x8) | Details | - 40 C | + 75 C | SMD/SMT | 有 | 260 | 1.2 V | QFN | PCI-SIG Compliant Quad Retiming Re-Driver | Semtech Corporation | 表面贴装 | Tray | 活跃 | - | 1.8 V | 未说明 | 有 | GN1406-INE3 | 活跃 | SEMTECH CORP | 5.24 | -40 to 75 °C | Tray | GN14 | 时钟和数据恢复 | 8542.39.00.01 | 1.2V ~ 1.8V | 未说明 | compliant | Clock | 56 | 5 Output | 1 | Clock | 5:5 | 无 | Yes/Yes | 电信电路 | PCI Express (PCIe), InfiniBand | |||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI52131-A11AGMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | QFN-24 | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | Tape & Reel (TR) | SI52131 | 活跃 | 200MHz | -40°C ~ 85°C | Reel | SI52131 | 3.135V ~ 3.465V | Clock | 1 | Clock, Crystal | 1:3 | 有 | No/Yes | PCI Express (PCIe), Clock Generator | 时钟发生器 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338K-B11540-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | 0.015873 oz | 2500 | 有 | Details | Tape & Reel (TR) | 活跃 | 710MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 2:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338L-B11654-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 350MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 2:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338M-B11641-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 200MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 2:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338B-B11570-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 350MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 3:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338P-B11617-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 350MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 4:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338N-B11525-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 710MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 4:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338M-B11651-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 200MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 2:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338B-B11478-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 350MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 3:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338B-B11646-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | 350MHz | 活跃 | Tape & Reel (TR) | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 3:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338N-B11532-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 710MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 4:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | SI5338M-B11652-GMR | Skyworks Solutions, Inc. | 数据表 | N/A | - | 最小起订量: 1 最小包装量: 1 | 表面贴装 | 24-VFQFN Exposed Pad | 24-QFN (4x4) | Skyworks Solutions Inc. | Details | 有 | 2500 | 0.015873 oz | Tape & Reel (TR) | 活跃 | 200MHz | -40°C ~ 85°C (TA) | Reel | MultiSynth™ | 1.71V ~ 1.98V, 2.25V ~ 2.75V, 2.97V ~ 3.63V | CML, HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL | 1 | CML, CMOS, HCSL, HSCT, HSTL, LVDS, LVPECL, SSTL, Crystal | 2:4 | 是,带旁通 | Yes/Yes | Ethernet, Fibre Channel, PCI Express (PCIe), Telecom |
5P49V5929B000NLGI8
Renesas Electronics America Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
5P49V5914B000NLGI8
Renesas Electronics America Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
8T49N282C-999NLGI8
Renesas Electronics America Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
5P49V5901B669NLGI8
Renesas Electronics America Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
CY22U1LCALGXI-00
Cypress Semiconductor Corp
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SL23EP09ZC-1H
Silicon Labs
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5344D-B04894-GM
Skyworks
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5345B-B08454-GMR
Skyworks
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SL15300ZC-16CH1
Skyworks
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
5V49EE503-046NLGI8
Renesas
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
5P49V5913A003NLGI8
Renesas
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5335A-B04711-GM
Skyworks
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
GN1406-INE3
Semtech
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI52131-A11AGMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338K-B11540-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338L-B11654-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338M-B11641-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338B-B11570-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338P-B11617-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338N-B11525-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338M-B11651-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338B-B11478-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338B-B11646-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338N-B11532-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
SI5338M-B11652-GMR
Skyworks Solutions, Inc.
分类:Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers
