AD9121 Dual, 14-Bit, 1230 MSPS, TxDAC+ Digital-to-Analog Converter

Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies (IF). Proprietary DAC output switching technique enhances dynamic performance. Current outputs are easily configured for various single-ended or differential circuit topologies. Flexible LVDS digital interface allows the standard 28-wire bus to be reduced to one-half of the width. Applications

The AD9121 is a dual, 14-bit, high dynamic range digital-to-analog converter (DAC) that provides a sample rate of 1230 MSPS, permitting multicarrier generation up to the Nyquist frequency.

The AD9121 TxDAC+® includes 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 quadrature modulators, such as the ADL537x F-MOD series from Analog Devices, Inc. A 4-wire serial port interface provides for programming/readback of many internal parameters. Full-scale output current can be programmed over a range of 8.7 mA to 31.7 mA. The AD9121 comes in a 72-lead LFCSP.

Product Highlights

Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies (IF).
Proprietary DAC output switching technique enhances dynamic performance.
Current outputs are easily configured for various single-ended or differential circuit topologies.
Flexible LVDS digital interface allows the standard 28-wire bus to be reduced to one-half of the width.

Applications

Features and Benefits

Flexible LVDS interface allows word or byte load
Single-carrier W-CDMA ACLR = 82 dBc at 122.88 MHz IF
Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
Integrated 2×/4×/8× interpolator/complex modulator allows carrier placement anywhere in the DAC bandwidth
Gain, dc offset, and phase adjustment for sideband suppression

Multiple chip synchronization interfaces
High performance, low noise PLL clock multiplier
Digital inverse sinc filter
Low power: 1.5 W at 1.2 GSPS, 800 mW at 500 MSPS, full operating conditions
72-lead, exposed paddle LFCSP

Digital to Analog Converters

Data Sheets

Document	note
AD9121: Dual, 14-bit, 1230 MSPS, TxDAC+ Digital-to-Analog Converter (Rev. B)	PDF 927 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD9121BCPZ Production	72 ld LFCSP (10x10mm, 6.0mm exposed pad)	OTH 168	-40 to 85C	34.71	29.5	Y
AD9121BCPZRL Production	72 ld LFCSP (10x10mm, 6.0mm exposed pad)	REEL 2000	-40 to 85C	0	29.5	Y

Evaluation Boards

Part Number	Description	Price	RoHS
AD9121-M5372-EBZ	Evaluation Board	495	Y
AD9121-M5375-EBZ	Evaluation Board	495	Y

Reference Materials

Solutions Bulletins & Brochures：Digital to Analog Converters ICs Solutions Bulletin

AD9121: Dual, 14-bit, 1230 MSPS, TxDAC+ Digital-to-Analog Converter (Rev. B) ad9121

Digital to Analog Converters ICs Solutions Bulletin ad5590