Data Converter Enables World’s Multi-Standard, Multi-Carrier Communications Systems
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.
21, 2009 -- NORWOOD, Mass.-- (BUSINESS
WIRE)-- 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
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
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.
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
Product Sample Channel Resolution Data
Rate Price Each Availability Count (Bits) (MSPS) per Per 1,000
AD9122 NOW 2 16 600 $34.95
DAC Data Pattern Generator Tool Available
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.
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
http://www.analog.com/ADCsearch. For ADC drivers,
http://www.analog.com/ADCdrivers. To view ADI’s DAC
selection guide, visit
About Analog Devices, Inc.
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 technologies, Analog Devices serves over 60,000 customers,
representing virtually all types of electronic equipment. Celebrating over 40 years as a leading global
manufacturer of high-performance integrated circuits for analog- and digital-signal processing applications,
Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the
world. Analog Devices' common stock is listed on the New York Stock Exchange under the ticker “ADI” and 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.