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ADI AD9739 14位2500MSPS RF DAC评估方案

作者:  时间:2009-03-19 09:05  来源:eaw
ADI 公司的AD9739是高性能高频14位DAC,取样速率高达2500MSPS,宽带信号高达1GHz,可进行多载波发生,在基带模式下高达频率,在混合模式下达到第二和第三Nyquist区. AD9739包括SPI接口,双端LVDS接口.输出电流可在8.66mA到 31.66mA间编程.工作电压1.8V到3.3V. AD9739广泛用在宽带通信系统,CMTS/VOD,蜂窝基础设备,点到点无线,仪表和自动测试仪表以及雷达和航空设备.本文介绍了AD9739的主要特性, 功能方框图以及一些接口电路和DOCSIS评估板电路图.

14-Bit, 2500 MSPS, RF Digital-to-Analog Converter AD9739
The AD9739 is a high performance, high frequency 14-bit DAC that provides sample rates up to 2500 MSPS, permitting multicarrier generation up to the Nyquist frequency in baseband mode and second and third Nyquist zones in mix mode. It includes a serial peripheral interface (SPI) for configuration and readback of status registers. A dual-port LVDS interface is used to enable the high sample rate with existing FGPA/ASIC technology. The output current can be programmed over a range of 8.66 mA to 31.66 mA. The AD9739 is manufactured on a 0.18 μm CMOS process and operates from 1.8 V and 3.3 V supplies. It is supplied in a 160- ball chip scale ball grid array for reduced package parasitics.

AD9739产品亮点:
1. Low noise and intermodulation distortion (IMD) performance enable high quality synthesis of wideband signals up to 1 GHz.
2. A dual-port interface with double data rate (DDR) LVDS data receivers supports the maximum conversion rate of 2500 MSPS.

3. Manufactured on a CMOS process, the AD9739 uses a proprietary switching technique that enhances dynamic performance.
4. The current output(s) of the AD9739 are easily configured for single-ended or differential circuit topologies.
AD9739主要特性:

Dynamic performance
DOCSIS 3.0 performance
8 QAM carriers  400 MHz IF: −71 dBc
16 QAM carriers 400 MHz IF: −68 dBc
32 QAM carriers 400 MHz IF: −65 dBc
72 QAM carriers 600 MHz IF: −61 dBc
Single-carrier WCDMA ACLR performance  2457.6 MSPS
fOUT = 350 MHz (normal mode)
1st adjacent channel: −80 dBc
5th adjacent channel: −80.5 dBc
fOUT = 2100 MHz (mix mode)
1st adjacent channel: −69 dBc
5th adjacent channel: −75 dBc
Single-tone NSD performance 2.4 GSPS
−166 dBm/Hz  100 MHz IF
−162 dBm/Hz  1 GHz IF
RF synthesis support
FS mix, RZ modes
Dual-port LVDS data interface with on-chip 100 Ω
terminations
Low power: 1.1 W  2.5 GSPS
AD9739应用:
Broadband communications systems
CMTS/VOD
ellular infrastructure
Point-to-point wireless
Instrumentation, automatic test equipment
Radar, avionics



图1.AD9739功能方框图



图2.推荐的AD9739接口电路



图3.推荐的DOCSIS测量用变压器输出级




图4.DOCSIS评估板电路图(1)



图5.DOCSIS评估板电路图(2)




图6.DOCSIS评估板电路图(3)



图7.DOCSIS评估板电路图(4)



图8.DOCSIS评估板电路图(5)

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