RF transceiver with integrated ADCs and DACs
IEEE 802.16 WiMAX
3.3 GHz to 3.8 GHz
3.5 MHz < BW < 20 MHz
Superior receiver sensitivity with NF 3.2 dB
Highly linear and spectrally pure transmitter
Tx EVM: −36 dB
SNR > 134 dB/Hz at fOFFSET > 22 MHz
Tx power control
Range: 0 dB to 58 dB
Resolution: 0.25 dB
Autonomous AGC and Tx power control
Automatic frequency correction < 0.012 ppm
Integrated fractional-N synthesizer
8 Hz LO step size
Integrated phase noise < 0.8°rms
The AD9353 is a fully integrated transceiver for IEEE 802.16
WiMAX wireless network systems. The RF MxFE® combines
the RF front end with mixed-signal baseband enabling an easy-
to-use digital interface to the baseband ASIC or FPGA. The
AD9353 operates in the 3.3 GHz to 3.8 GHz range covering
most of the licensed and unlicensed bands. Channel bandwidths
www.Daotfa3S.5heMetH4Uz.,c4o.m375 MHz, 5 MHz, 7 MHz, 8.75 MHz, 10 MHz,
14 MHz, 17.5 MHz, and 20 MHz are supported.
The direct-conversion receiver has state-of-the-art noise figure
and linearity, and requires no external components with the
exception of a balun. The complete RF subsystem integrates
an autonomous AGC loop and dc offset corrections, thus
eliminating the need for high speed interaction with the
baseband processor. The received signal strength indicator
(RSSI) has over 80 dB of dynamic range with 0.5 dB resolution
and is accessible via the serial interface.
The received signal is digitized with a high dynamic range
12-bit ADC. Decimation and channel filters produce a 10-bit
output signal at the appropriate sample rate determined by the
bandwidth mode. The transmit path takes 10-bit input data and
interpolates before converting to the analog domain and
upconverting to the carrier frequency.
FUNCTIONAL BLOCK DIAGRAM
CTRL AUX ADC AUX DAC
The highly linear transmit path has excellent spectral purity
with sideband noise less than −134 dBc/Hz at 22 MHz offset
and offers EVM of −36 dB at 0 dBm output power. The transmit
power is detected by an accurate power detector and autono-
mously controlled with a range of 58 dB and 0.25 dB steps.
The output power can be calibrated at the factory by a single
The reference frequency is produced by an internal crystal
oscillator that has a digital programmable frequency with
0.012 ppm resolution, thus reducing the total bill of materials
of the device.
An internal auxiliary ADC and two auxiliary DACs are
available for system monitoring and control. Three general-
purpose I/Os are also included and can be register programmed
or automatically sequenced by a user-defined state machine.
Mode control is via a 4-wire serial port and four real-time I/O
The AD9353 is powered from a single 3.3 V supply and contains
on-chip LDOs for each function to eliminate external regula-
tors. The AD9353 is packaged in a 9 mm × 9 mm, 64-lead LFCSP.
For more information on the AD9353, email Analog Devices, Inc. at
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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