Analog Devices introduces RF-to-digital baseband transceivers designed to enable the IEEE 802.16d/e mobile WiMAX (Worldwide Interoperability for Microwave Access) standard for mobile communications devices, such as cell phones, personal digital assistants (PDAs), and handheld multimedia devices.  WiMAX terminals enable wireless broadband connectivity with dramatically lower installation costs than competitive wired solutions.  As WiMAX evolves from a fixed-line protocol to one that increasingly serves portable communications applications, device makers are requiring smaller, more energy-efficient solutions that meet the cost, space and power budgets of mobile communications terminals. The AD9354 and AD9355 mobile WiMAX transceivers are sampling now. The devices are priced at $11.45 per unit in sample volumes. The AD9354 and AD9355 are housed in an 8 mm × 8 mm, 64-lead LFCSP (lead-frame chip-scale package).

The AD9354 and AD9355 transceivers integrate two direct-conversion receivers that provide support for MIMO technology, which ensures mobile devices achieve uninterrupted WiMAX service.  The direct-conversion transmitter architecture achieves state-of-the-art error vector magnitude (EVM), maximizing network throughput.  The transceivers communicate with a WiMAX terminal's baseband ASIC or FPGA using the industry standard JESD207 digital interface that Analog Devices helped to define.  The data bus requires 13 pins, which is comparable to competitive products employing analog interfaces.

These products operate in the 2.3- to 2.7-GHz and the 3.3- to 3.7-GHz ranges and support channel bandwidths of 3.5, 4.375, 5, 7, 8.75 and 10 MHz. The devices have an excellent 3.25 dB noise figure (NF) and best-in-class linearity, both of which enable optimum real-world performance as WiMAX network traffic increases.  The smart partitioning architecture enables autonomous AGC (automatic-gain control), transmit-power control (TPC), and calibration routines that dramatically reduce the RF driver development effort. Additionally, the highly accurate closed-loop power control enables 1-point factory calibration of transmits power.  In contrast, other transceivers require 8 to 10 calibration points, which increase final test costs and extended development times.

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