AD9268: 16位、125 MSPS/105 MSPS/80 MSPS、1.8 V、双通道模数转换器
AD9268是一款双通道、16位、125 MSPS模数转换器(ADC),设计用来支持需要高性能、低成本、小尺寸且具多功能性的通信应用。这款双通道ADC内核采用多级、差分流水线架构,并集成了输出误差校正逻辑。每个ADC均具有宽带宽、差分采样保持模拟输入放大器,支持用户可选的各种输入范围。集成基准电压源可简化设计。占空比稳定器可用来补偿ADC时钟占空比的波动,使转换器保持出色的性能。ADC输出数据可以直接路由至两个外部16位输出端口,这些输出可以设置为1.8 V CMOS或LVDS。需要时,灵活的省电选项可以明显降低功耗。设置与控制编程利用三线式SPI兼容型串行接口来完成。AD9268采用64引脚LFCSP封装,额定温度范围为−40°C至+85°C工业温度范围。
The AD9268 is a dual, 16-bit, 125 MSPS analog-to-digital converter (ADC). The AD9268 is designed to support communications applications where high performance, combined with low cost, small size, and versatility, is desired.
The dual ADC core features a multistage, differential pipelined architecture with integrated output error correction logic. Each ADC features wide bandwidth, differential sample-and-hold analog input amplifiers that support a variety of user-selectable input ranges. An integrated voltage reference eases design considerations. A duty cycle stabilizer is provided to compensate for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance.
The ADC output data can be routed directly to the two external 16-bit output ports. These outputs can be set to either 1.8 V CMOS or LVDS.
Flexible power-down options allow significant power savings, when desired.Programming for setup and control is accomplished using a 3-wire SPI-compatible serial interface.The AD9268 is available in a 64-lead LFCSP and is specified over the industrial temperature range of −40°C to +85°C.
AD9268 特点
- 信噪比(SNR):78.2 dBFS (70 MHz)
- 无杂散动态范围(SFDR):88 dBc (70 MHz)
- 低功耗:750 mW (125 MSPS)
- 1.8 V模拟电源供电
- 1.8 V CMOS或LVDS输出电源
- 1至8整数输入时钟分频器
- 中频采样频率达300 MHz
- 小信号输入噪声:−153.6 dBm/Hz(200 Ω输入阻抗、70 MHz、125 MSPS)
- 可选片内抖动
- 欲了解更多特性,请参考数据手册
- SNR = 78.2 dBFS @ 70 MHz
- SFDR = 88 dBc @ 70 MHz
- Low power: 750 mW @ 125 MSPS
- 1.8 V analog supply operation
- 1.8 V CMOS or LVDS output supply
- Integer 1-to-8 input clock divider
- IF sampling frequencies to 300 MHz
- −153.6 dBm/Hz small-signal input noise with 200 Ω input impedance @ 70 MHz and 125 MSPS
- Optional on-chip dither
- See data sheet for additional features
AD9268 技术指标
- Resolution (Bits): 16bit
- # Chan: 2
- Sample Rate: 125MSPS
- Interface: Par
- Resolution (Bits): 16bit
- # Chan: 2
- Sample Rate: 125MSPS
- Interface: Par
AD9268 亮点
- 片内抖动选项通过低功耗模拟输入改善SFDR性能。
- 专有差分输入在最高300 MHz的输入频率下仍保持出色的信噪比(SNR)性能。
- 采用1.8 V单电源供电,而数字输出驱动器采用一个独立的电源供电,以支持1.8 V CMOS或LVDS输出。
- 标准串行端口接口(SPI)支持各种产品特性和功能,例如:数据格式化(偏移二进制、二进制补码或格雷码)、时钟DCS使能、省电模式、测试模式以及基准电压模式等。
- 与AD9258引脚兼容,使16位产品可轻松迁移至14位产品。AD9268还与面向较低采样速率、低功耗应用的AD9251、AD9231和AD9204系列产品(计划于2009年5月发布)引脚兼容。
- On-chip dither option for improved SFDR performance with low power analog input.
- Proprietary differential input that maintains excellent SNR performance for input frequencies up to 300 MHz.
- Operation from a single 1.8 V supply and a separate digital output driver supply accommodating 1.8 V CMOS or LVDS outputs.
- Standard serial port interface (SPI) that supports various product features and functions, such as data formatting (offset binary, twos complement, or gray coding), enabling the clock DCS, power-down, test modes, and voltage reference mode.
- Pin compatibility with the AD9258, allowing a simple migration from 16 bits to 14 bits. The AD9268 is also pin compatible with the AD9251, AD9231, and AD9204 family of products (which is planned for release in May 2009) for lower sample rate, low power applications.
AD9268 应用领域
- 通信
- 分集无线电系统
- 多模式数字接收机(3G) GSM、EDGE、W-CDMA、LTE、CDMA2000、WiMAX、TD-SCDMA
- I/Q解调系统
- 智能天线系统
- 通用软件无线电
- 宽带数据应用
- 超声设备
- Communications
- Diversity radio systems
- Multimode digital receivers (3G)GSM, EDGE, W-CDMA, LTE,CDMA2000, WiMAX, TD-SCDMA
- I/Q demodulation systems
- Smart antenna systems
- General-purpose software radios
- Broadband data applications
- Ultrasound equipment
AD9268 功能框图
AD9268 建议配套产品
- 推荐AD9268使用的驱动放大器
- 推荐AD9268使用的VGA
- 推荐AD9268使用的时钟驱动器
- 推荐AD9268使用的电源
- 推荐电源解决方案
- 欲选择电压调节器产品,请使用ADIsimPower。
AD9268 芯片订购指南
AD9268-105EBZ 应用技术支持与电子电路设计开发资源下载
- AD9268-105EBZ 评估版资料下载 . pdf
- Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .pdf
- ADC模数转换器选型指南 . pdf