Product category:
Communications ICs (Wireless)
News Release from: Analog Devices | Subject: ADL537x and ADL532x
Edited by the Electronicstalk Editorial
Team on 10 May 2006
Quadrature modulators have all bands
covered
A family of five pin-compatible quadrature modulators together cover the 250MHz to 4GHz frequency range.
Analog Devices has extended its portfolio of radio frequency (RF) integrated circuits (ICs) with a family of five pin-compatible quadrature modulators that together cover the 250MHz to 4GHz frequency range, enabling wireless system engineers to standardise board designs across multiple operating bands and cellular standards Each of the five quadrature modulators is optimised for a specific frequency band, reducing the performance degradation that occurs when a single modulator is specified to handle the entire frequency bandwidth
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
Related stories
A/D convertor measures smaller signals faster
Sigma-delta ADC achieves greater than true 16bit noise-free resolution up to 2.4kHz across all input voltages from 40mV to 5V.
SAR convertor claims record speed and accuracy
A/D convertor achieves a new level of 16bit data capture performance, with best-in-class 15bit ENOB and 10Msample/s throughput.
Designed to convert complex modulation information - such as voice, digital data, or analogue video - from the baseband to the final RF output frequency, ADI's new quadrature modulators generate highly linear modulated RF signals at higher output levels.
This eliminates the intermediate frequency stages in the transmit signal chain, improving transmission quality and lowering system cost.
To further reduce cost and simplify system design, the devices feature a direct interface to ADI's TxDAC+ transmit digital-to-analogue convertors (DACs).
Further reading
Front-end IC cleans up transmitter designs
The ADF9010 integrates a high-performance transmitter quadrature modulator with an integer-N synthesiser and on-chip low-phase-noise voltage-controlled oscillator.
Demodulator and amp cut receiver complexity
Combined two-chip solution can reduce the active component count by 60% within a radio design, providing considerable board area and bill of material savings.
Microcontrollers integrate 24bit convertors
With on-chip 24bit sigma-delta ADCs, the ADuC706x provides the resolution required by today's high-performance industrial and instrumentation equipment.
"The proliferation of new standards, the addition of new frequency bands, and the evolution towards high-speed data services means wireless communications equipment manufacturers have to produce systems capable of effectively handling a wider range of modulation formats over a broader spectrum of frequencies", said Peter Real, Product Line Director, RF and Networking Components, Analog Devices.
"The ADL537x family provides the highest linearity and output power over the entire range of cellular and broadband wireless infrastructure frequency bands for direct conversion transmit applications".
"The ADL537x family is fully specified to support cellular GSM, CDMA, TDS-CDMA, W-CDMA and cdma2000 basestations, and broadband cable and wireless applications".
In addition to the ADL537x family, ADI is introducing two highly linear, fixed-gain RF amplifiers that integrate input and output matching networks on a single 3 x 3mm chip.
Integrating both input and output matches eliminates up to six external components typically required by competing devices.
The ADL5322 is tuned to support 700MHz to 1GHz operation and the ADL5323 is tuned to support 1.7 to 2.4GHz.
The 0.5W (28dBm at P1dB) output power predrivers provide highly linear output of 42dBm IP3 and excellent gain stability of +/-0.25dB.
With a fixed gain of 20dB, both amplifiers are ideally suited for use at the output of the ADL537x modulator family, the output stage of a cellular basestation radio card, or as an input predriver in a multicarrier basestation power amplifier (PA).
Combining the ADL537x with the ADL532x produces a fully characterised, highly linear signal chain with exceptional output power stability reducing the need for gain and power temperature correction circuitry.
The ADL537x family of quadrature modulators can be used as direct-to-RF modulators in digital communication systems, including GSM, CDMA, TDS-CDMA, WCDMA and cdma2000 basestations and QPSK or QAM broadband wireless access transmitters.
With input bandwidth of 700MHz, the ADL537x family simplifies the design of broadband digital pre-distortion transmitters used for the correction of multicarrier power amplifier distortion products.
To improve system performance and speed time to market, the ADL537x quadrature modulators are designed to seamlessly interface to ADI's TxDAC+ transmit DACs.
The ADL537x family offers high linearity (+12dBm P1dB and +26dBm IP3 at 2140MHz) and low noise (-158dBm/Hz).
The family also features a buffered single-ended local oscillator (LO) drive and operates from a singly supply voltage of 4.75 to 5.5V.
The ADL537x is fully specified over the industrial temperature range of -40 to +85C.
The ADL537x quadrature modulators are sampling now, with release scheduled for December 2006.
The devices are available in 4 x 4mm lead frame chip scale packages (LFCSP) and are priced at $4.98 per unit in 1000-piece quantities.
Evaluation boards combining the quadrature modulators with the TxDAC+ transmit DACs are available.
The ADL5322 and ADL5323 predrivers are sampling now, with release scheduled for July 2006, and are priced at $3.48 per unit in 1000-piece quantities.
• Analog Devices: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
