- ADI’s DAC features 400-MHz bandwidth with on-chip numerically-controlled oscillator and speeds of 1.2 GSPS to support multi-carrier wireless digital pre-distortion specifications.
AD9122, Dual-channel, 1.2-GSPS, 16-bit Digital-to-Analog Converter

Norwood, MA (09/28/2009) - Analog Devices, Inc. (NYSE: ADI), the global leader in data-conversion technology, introduced today a dual-channel, 1.2-GSPS (giga-sample-per-second), 16-bit DAC (digital-to-analog converter) that supports the high data rates and complex modulation schemes required for advanced multi-carrier wireless and broadband communications equipment throughout the world. According to ABI Research, global wireless infrastructure spending will reach $49 billion this year with Asia, South America, the Middle East and Africa as key emerging markets for future growth.

Featuring an on-chip 32-bit NCO (numerically-controlled oscillator*) that allows flexible placement of the IF (intermediate frequency) to help optimize system performance, ADI’s AD9122 DAC satisfies requirements for multi-standard cellular base stations and other applications that use sophisticated DPD (digital pre-distortion**) techniques demanding broad signal bandwidths. The wireless communications standards that the AD9122 supports include GSM, WCDMA, TD-SCDMA, CDMA2000, WiMAX, and LTE.

The combination of the AD9122 dual DAC and ADI’s ADL5375 quadrature modulator and AD9516 14-output clock generator meets or exceeds six multi-carrier GSM specifications for IMD (intermodulation distortion) and SNR (signal-to-noise ratio). This signal chain is available as an evaluation board. Other complementary parts include the recently announced ADRF6702 quadrature modulator and ADRF6602 Rx mixer.

AD9122: High-Speed Dual DAC with 1.2-GSPS LVDS Interface
The AD9122 LVDS (low-voltage differential signaling) interface with an eight-word-deep FIFO (first-in, first-out) memory supports a maximum sample-data-input-rate of 1.2 GSPS and 600 MSPS (mega samples per second) per DAC to support signal bandwidths up to 400 MHz in advanced DPD transmitter architectures. The data interface supports word, byte, and nibble load allowing customers to reduce input pins on lower data rates to save board space, power and cost. The AD9122 includes an improved on-chip PLL (phased-locked loop) with lower jitter and phase noise. Operating with the on-chip PLL at a DAC output frequency of 150 MHz, the AD9122 delivers a 76-dB ACLR (adjacent-channel leakage ratio) for single-carrier WCDMA applications. For the most demanding wireless communications applications, the AD9122 can achieve 83-dBc ACLR using an external PLL.

The combination of input data rates, high DAC sample rates, and fine modulation with the integrated NCO gives system designers flexibility when choosing DAC output frequencies. This is especially helpful in meeting four- to six-carrier GSM transmission specifications and other communications standards.

The AD9122 includes integrated interpolation filters with selectable interpolation factors of 2, 4, and 8. The dual DAC also integrates 32-bit NCOs and is available in a space-saving 72-pin LFCSP (lead-frame chip-scale package) that is 50 percent smaller than previous generation DACs.

Pricing, Availability and Tools

Sample Availability
Channel Count
Resolution (Bits)
Data Rate (MSPS)
per DAC
Price Each
per 1,000

DAC Data Pattern Generator Tool Available
ADI’s Data Pattern Generator (DPG2) is a bench-top instrument for driving vectors into Analog Devices' high-speed digital-to-analog converters. The DPG2 connects to a PC over USB and allows a user to download a vector from their PC into the DPG2’s internal memory. Once downloaded, the DPG2 can run the vector at full speed via an attached evaluation board for a specific DAC. This allows for rapid evaluation of the DAC with both generic and customer-generated test data.

For more information, visit For information on ADI’s DAC products, visit

Data Converters: Bridging the Analog and Digital Worlds
More designers turn to Analog Devices than any other supplier for the high-performance conversion technology required to bridge the analog and digital worlds in today’s myriad electronic systems. With the industry’s leading portfolio of ADCs (analog-to-digital converters) and DACs (digital-to-analog converters), Analog Devices’ data converter products feature the right combination of sampling rates and accuracy with low noise, power, and price and small package size required by industrial, medical, automotive, communications, and consumer electronics. Online evaluation tools help customers quickly validate, select, and design in the optimal data converters to reduce design complexity, development schedules, and bill-of-material costs. To view ADI’s ADC selection guide, visit For ADC drivers, visit To view ADI’s DAC selection guide, visit

About Analog Devices

Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 100,000 customers, representing virtually all types of electronic equipment. Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices is included in the S&P 500 Index.

* A numerically controlled oscillator is used to provide frequency translation in the digital domain-- an important block in modern digital radio processing.

** Digital pre-distortion is an advanced signal processing technique that corrects for nonlinearities in radio transmit paths, allowing power amplifiers to run at higher efficiency levels with less distortion.

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Editor's Contact Information:

Bob Olson

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