1 Features

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• Dual RF sampling 12GSPS transmit DACs

• Dual RF sampling 3GSPS receive ADCs

• Maximum RF signal bandwidth: 400MHz

• RF frequency range: 400MHz to 6GHz

• Digital step attenuators (DSA):

– TX: 40dB range, 0.125dB steps

– RX: 25dB range, 0.5dB steps

• Single or dual-band DUC or DDCs

• Optional Internal PLL or VCO for DAC or ADC

clocks or external clock at DAC or ADC sample

rate

• SerDes data interface:

– JESD204B and JESD204C compatible

– 8 SerDes transceivers up to 29.5Gbps

– Subclass 1 multidevice synchronization

• Package: 17mm × 17mm FCBGA, 0.8mm pitch

2 Applications

• Macro remote radio unit (RRU)

• Small cell base station

• Repeater

• Distributed Antenna Systems (DAS)

• Fixed Wireless Access (FWA)

3 Description

The AFE7922 is a high performance, wide bandwidth

multichannel transceiver, integrating two RF sampling

transmitter chains and two RF sampling receiver

chains. The high dynamic range of the transmitter

and receiver chains allows the device to generate and

receive 3G, 4G, and 5G signals from wireless base

stations, while the wide bandwidth capability of the

AFE7922 is designed for multiband 4G and 5G base

stations.

The TX signal paths support interpolation and digital

up conversion options that deliver up to 400MHz

of signal bandwidth per TX channel. The output

of the DUCs drives a 12GSPS DAC (digital to

analog converter) with a mixed mode output option

to enhance 2nd Nyquist operation. The DAC output

includes a variable gain amplifier (TX DSA) with 40dB

range and 1dB analog and 0.125dB digital steps.

Each receiver chain includes a 25dB range DSA

(Digital Step Attenuator), followed by a 3GSPS ADC

(analog-to-digital converter). Each receiver channel

has an analog peak power detector and various

digital power detectors to assist an external or

internal autonomous automatic gain controller, and

RF overload detectors for device reliability protection.

Flexible decimation options provide optimization of

signal bandwidth of up to 400MHz per RX channel.