ANALOG DEVICES AD9356 Service Manual

WiMAX/BWA/WiBRO/LTE RF MxFE

AD9356

FILTER

DAC

DAC

AD9356

RX1P,

RX1N

RX2P,RX2N

TX1P,TX1N

GPO[3:0] GPO

AUXADCx

INPUTS

AUXDACx
OUTPUTS

TX1

POWER

DETECT

XTALN
XTALP

REF_CLK
IN/OUT

D[11:0]

CTRL_OUT

[7:0]

DATA_CLK

DATA_VALID

TXNRX

FILTER

SPI_x

DAC

DAC

FILTER

TX2P,TX2N

TX2

POWER

DETECT

FB_CLK

CTRL_IN

[3:0]

ENAGC

2

2

2

2

12

8

4

FILTER

DATA

INTERFACE

FILTER

FILTER

FILTER

FILTER

LDOs

TEMP

DAC
DAC

CTRL

ADC

ADC

ADC

BBPLL,
RFPLL,

DATA_CLK,

SYNTH

08596-001

SPI

FEATURES

RF transceiver with integrated 12-bit ADCs and DACs
Band: 2.3 GHz to 2.7 GHz

3.5 MHz < BW < 10 MHz
Superior receiver sensitivity with NF < 3.2 dB
Highly linear and spectrally pure transmitter

Tx EVM: −40 dB
SNR: >130 dB/Hz at frequency offset >8 MHz

Transmit (Tx) power control range of 58 dB,

resolution of 0.25 dB

Receive (Rx) gain control

Real-time monitor and control signals for manual gain

Autonomous automatic gain control (AGC)
Automatic frequency correction: <0.012 ppm
Integrated fractional-N synthesizer

Integrated phase noise: <0.4°rms
Multichip synchronization
Industry-standard JESD207 and ADI/Q digital interface

APPLICATIONS

WiMAX/BWA/WiBRO/LTE

Femtocell/picocell/microcell base stations

Fixed CPEs

2 × 2 MIMO Transceiver

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The AD9356 is a radio frequency (RF) transceiver with high
performance dual receivers and transmitters, ideally suited for
WiMAX, WiBRO, BWA, and LTE base stations and fixed CPEs.
The RF MxFE® combines an RF front end with a mixed-signal
baseband, enabling an easy-to-use JESD207 or ADI/Q® digital
interface to the baseband processor (BBP), ASIC, or FPGA. The
AD9356 operates in the 2.3 GHz to 2.7 GHz range, covering most
licensed and unlicensed bands, and supports channel bandwidths
of 3.5 MHz, 4.375 MHz, 5 MHz, 7 MHz, 8.75 MHz, and 10 MHz.

The direct-conversion receivers have state-of-the-art noise figure
and linearity and require no external components with the exception
of baluns. The complete RF subsystem integrates autonomous AGC
loops, dc offset corrections, and quadrature calibrations, elimin­ating the need for high speed interaction with the BBP.

Two high dynamic range ADCs, followed by decimation and
channel filters, digitize the received signals and produce 12-bit
output signals at a sample rate determined by the bandwidth
mode. The transmit path takes 12-bit input data and interpolates
before converting to the analog domain and upconverting to the
carrier frequency.

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 registered trademarks are the property of their respective owners.

The highly linear transmit path has excellent spectral purity with
sideband noise less than −130 dBc/Hz at 8 MHz frequency offset
and offers an error vector magnitude (EVM) of −40 dB. An accurate
power detector with a range of more than 50 dB in 0.25 dB steps
measures the output power of each transmitter independently.

The reference frequency can be provided by an external reference
clock or by an internal digitally controlled crystal oscillator
(DCXO). The DCXO resolution is 0.012 ppm.

Using the built-in state machine to control the device, the AD9356
can be easily controlled in time division duplexing (TDD), half­duplex frequency division duplexing (HFDD), or, if two devices
are used, frequency division duplexing (FDD) mode.

One three-input internal auxiliary ADC and two auxiliary DACs
are available for system monitoring and control. A user-defined
state machine can automatically sequence four GPOs. A single 3.3 V
supply powers the device with on-chip low dropout linear voltage
regulators (LDOs) providing all other required supplies. The
AD9356 package is a 10 mm × 10 mm, 144-ball BGA.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] ©2010 Analog Devices, Inc. All rights reserved.

www.analog.com