AD9778 Dual 14-Bit, 1 GSPS, Digital-to-Analog Converter _ BDTIC 中国领先电子元器件代理商

AD9778 Dual 14-Bit, 1 GSPS, Digital-to-Analog Converter

The AD9776/AD9778/AD9779 are dual, 12-/14-/16-bit, high dynamic range, digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting multicarrier generation up to the Nyquist frequency. They include features optimized for direct conversion transmit applications, including complex digital modulation, and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quad-rature modulators such as the AD8349. A serial peripheral interface (SPI®) provides for programming/readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The devices are manufactured on an advanced 0.18 μm CMOS process and operate on 1.8 V and 3.3 V supplies for a total power consumption of 1.0 W. They are enclosed in 100-lead TQFP packages. Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies. A proprietary DAC output switching technique enhances dynamic performance. The current outputs are easily configured for various single-ended or differential circuit topologies. CMOS data input interface with adjustable set up and hold. Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth. Wireless infrastructure WCDMA, CDMA2000, TD-SCDMA, WiMax, GSM Digital high or low IF synthesis Internal digital upconversion capability Transmit diversity Wideband communications: LMDS/MMDS, point-to-point

Product Highlights

Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies.
A proprietary DAC output switching technique enhances dynamic performance.
The current outputs are easily configured for various single-ended or differential circuit topologies.
CMOS data input interface with adjustable set up and hold.
Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth.

Data Sheet, Rev. A, 3/07

产品特点和性能优势

Low power: 1.0 W @ 1 GSPS, 600 mW @ 500 MSPS, full operating conditions

SFDR = 78 dBc to fOUT = 100 MHz

Single carrier WCDMA ACLR = 79 dBc @ 80 MHz IF

Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω

Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth

Auxiliary DACs allow control of external VGA and offset control

Multiple chip synchronization interface

High performance, low noise PLL clock multiplier

Digital inverse sinc filter

100-lead, exposed paddle TQFP package

数模转换器 (DAC)

数模转换器 (DAC)

AD9778 IBIS Models

AD9778 IBIS Models .IBS

数据手册

文档	备注
AD9776/AD9778/AD9779: Dual 12-/14-/16-Bit, 1 GSPS, Digital-to-Analog Converters Data Sheet (Rev. A)	PDF 1525 kB

应用笔记

文档	备注
AN-748: Set-Up and Hold Measurements in High Speed CMOS Input DACs (Rev. 0)	PDF 812 kB
AN-912: 用平衡电流输出DAC驱动中心抽头变压器[中文版] (Rev. 0)	PDF 363 kB
AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC (Rev. 0)	PDF 246 kB
AN-748: 高速CMOS输入DAC中的建立和保持时间测量 (Rev. 0)	PDF 0
AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 1	PDF 1295 kB

订购信息

产品型号	封装	包装数量	温度范围	美金报价 100-499	美金报价 1000+	RoHS
AD9778BSVZ 量产	100 ld TQFP-ED(w/ 6.5mm exposed pad)	OTH 90	-40 至 85至	29.7	25.25	Y
AD9778BSVZRL 量产	100 ld TQFP-ED(w/ 6.5mm exposed pad)	REEL 1000	-40 至 85至	0	25.25	Y