WiMAX/WiBro RF MxFE
MISO Transceiver
AD9355
FEATURES
FUNCTIONAL BLOCK DIAGRAM
RF transceiver with integrated ADCs and DACs
IEEE 802.16 WiMAX/WiBro
AD9355
ADC
2
RX1_N, RX1_P
Dual receivers, single transmitter
ADC
TXNRX
Operating band: 3.3 GHz to 3.8 GHz
3.5 MHz < BW < 10 MHz
Superior receiver sensitivity with NF < 3.5 dB
Manual Rx gain or autonomous AGC mode
Highly linear and spectrally pure transmitter
Tx EVM = −38 dB
Tx noise floor < −134 dBm/Hz at fOFFSET > 22 MHz
Tx power control range of 58 dB, resolution of 0.25 dB
Integrated fractional-N synthesizer
10 Hz LO step size
LO integrated phase noise < 0.5°rms
Automatic frequency correction < 0.012 ppm
Industry-standard JESD-207 digital interface
10
ADC
D[9:0]
2
RX2_N, RX2_P
ADC
DAC
DAC
DATA_CLK
DV/FB_CLK
PW_DET
2
4
TX_N, TX_P
RADIO
SWITCHING*
(GPO0 TO GPO3)
GPO
LDOs
LO
REFCLK
4
SYNTH
SPI PORT
CTRL
2
XTALP
XTALN
CTRL_OUT[1:0] AUXADC AUXDAC
APPLICATIONS
*RADIO SWITCHING IS ONE POSSIBLE USE FOR THE GPO PINS.
BWA/WiMAX/WiBro
CPEs
Figure 1.
USB dongles/minicards
Pico and femto base stations
Proprietary radio systems
channel filters produce a 10-bit output signal at the appropriate
sample rate determined by the bandwidth mode. The transmit
path interpolates 10-bit input data before converting it to the
analog domain, and then upconverting it to the carrier frequency.
GENERAL DESCRIPTION
The highly linear transmit path has excellent spectral purity
with sideband noise less than −134 dBm/Hz at 22 MHz offset,
and it offers an error vector magnitude (EVM) of −38 dB at
0 dBm output power. The transmit power is detected by an
accurate power detector with a range of more than 40 dB and
0.5 dB steps. The output power can be calibrated at the factory
by a single measurement.
The AD9355 is a radio frequency (RF) transceiver with a single
transmitter and dual receivers fully integrated into the device. This
allows the part to be used for mobile and fixed WiMAX/WiBro
wireless network systems. By incorporating an RF MxFE™, the
AD9355 offers the combination of an RF front end and a mixed-
signal baseband, enabling an easy-to-use JESD-207-compliant
digital interface to the baseband application-specific integrated
circuit (ASIC) or field-programmable gate array (FPGA). In
addition, the AD9355 operates in the 3.3 GHz to 3.8 GHz range,
covering most of the licensed and unlicensed bands. Channel
bandwidths of 3.5 MHz, 4.375 MHz, 5 MHz, 7 MHz, 8.75 MHz,
and 10 MHz are supported.
The reference frequency is produced by an internal digitally
controlled crystal oscillator (DCXO) that has a programmable
frequency offset correction with a resolution of 0.012 ppm, thus
reducing the total bill of materials (BOM) of the device.
An internal auxiliary ADC and an auxiliary digital-to-analog
converter (DAC) are available for system monitoring and
control. Four 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 3- or 4-wire serial
port and four real-time I/O control pins. The AD9355 is
powered either from a single 3.3 V supply or, for power savings,
from dual supplies and contains on-chip low dropout (LDO)
regulators. The AD9355 is packaged in an 8 mm × 8 mm, 56-lead
lead frame chip scale package (LFCSP).
The direct-conversion receivers have state-of-the-art noise
figure (NF) and linearity and, with the exception of baluns, do
not require external components. The complete RF subsystem
integrates autonomous automatic gain control (AGC) loops and
dc offset corrections, thus eliminating the need for high speed
interaction with the baseband processor.
The received signal is digitized with a set of four analog-to-digital
converters (ADCs) with high dynamic range. Decimation and
Rev. Sp0
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2008 Analog Devices, Inc. All rights reserved.
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