AD9785 Dual 12-Bit 800 MSPS DAC with Low Power 32-Bit Complex NCO

Low noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies. Proprietary DAC output switching technique enhances dynamic performance. CMOS data input interface with adjustable setup and hold. Low power complex 32-bit numerically controlled oscillators (NCOs).

The AD9785/AD9787/AD9788 are 12-bit, 14-bit, and 16-bit, high dynamic range TxDAC® devices, respectively, that provide a sample rate of 800 MSPS, permitting multicarrier generation up to the Nyquist frequency. Features are included for optimizing direct conversion transmit applications, including complex digital modulation, as well as gain, phase, and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quadrature modulators, such as the ADL5375 family from Analog Devices, Inc. A serial peripheral interface (SPI) provides for programming and readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The AD9785/AD9787/AD9788 family is manufactured on a 0.18 μm CMOS process and operates from 1.8 V and 3.3 V supplies. It is enclosed in a 100-lead TQFP package.

Product Highlights

Applications

Features and Benefits

Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
Low power, fine complex NCO allows carrier placement anywhere in DAC bandwidth while adding <300 mW power
Auxiliary DACs allow I and Q gain matching and offset control
Includes programmable I and Q phase compensation

Internal digital upconversion capability
Multiple chip synchronization interface
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
100-lead, exposed pad TQFP package

Digital to Analog Converters

IBIS Models

AD9785 IBIS Model .IBS

Data Sheets

Document	note
AD9785/AD9787/AD9788 Dual 12-/14-/16-Bit 800 MSPS DAC with Low Power 32-Bit Complex NCO Data Sheet (Rev. B)	PDF 1.24 M

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD9785BSVZ Production	100 ld TQFP-ED(w/ 6.5mm exposed pad)	OTH 90	-40 to 85C	24.96	21.2	Y
AD9785BSVZRL Production	100 ld TQFP-ED(w/ 6.5mm exposed pad)	REEL 1000	-40 to 85C	0	21.2	Y