1 Features

• Quad RF sampling 12-GSPS transmit DACs

• Quad RF sampling 3-GSPS receive ADCs

• Dual RF sampling 3-GSPS feedback ADCs

• Maximum RF signal bandwidth:

– TX: 2400 MHz for 2TX or 1200 MHz for 4TX

– FB: 1200 MHz

– RX: 1200 MHz (no FB); 600 MHz (with FB)

• RF frequency range: up to 12 GHz

• Digital Step Attenuators (DSA):

– TX: 40 dB range, 1-dB analog and 0.125-dB

digital steps

– RX: 25 dB range, 0.5-dB steps

• Dual-band DUC/DDCs for TX and RX

• Dual NCOs for fast frequency switching

• Supports TDD operation with fast switching

between TX and RX

• Internal PLL/VCO to generate DAC/ADC clocks

• Optional external CLK at DAC or ADC rate

• SerDes data interface:

– JESD204B and JESD204C compliant

– 8 SerDes transceivers up to 29.5 Gbps

– 8b/10b and 64b/66b encoding

– 12-bit, 16-bit, 24-bit, and 32-bit resolution

– Subclass 1 multi-device synchronization

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

2 Applications

• Macro remote radio unit (RRU)

• Active antenna system mMIMO (AAS)

• Small cell base station

• Repeater

• 5G mmWave radio

• Distributed Antenna Systems (DAS)

3 Description

The high performance, wide bandwidth multi-channel

transceiver, integrating four RF sampling transmitter

chains, four RF sampling receiver chains, and two

RF sampling digitizing auxiliary chains (feedback

paths). 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 is

designed for multi-band 4G and 5G base stations.

Each receiver chain includes a 25-dB range DSA

(Digital Step Attenuator), followed by a 3-GSPS 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.

The single or dual digital down converters (DDC)

provide up to 600 MHz of combined signal BW in dual

DDC mode or 1200-MHz BW in single DDC mode. In

TDD mode, the receiver channel can be configured to

dynamically switch between the traffic receiver (TDD

RX) and wideband feedback receiver (TDD FB), with

the capability of reusing the same analog input for

both purposes.

Each transmitter chain includes a single or dual

digital up-converters (DUCs) supporting up to 2400

MHz for 2TX or 1200 MHz BW for 4TX combined

signal bandwidth. The output of the DUCs drives a 12-

GSPS DAC (digital-to-analog converter) with a mixed

mode output option to enhance 2nd or 3rd Nyquist

operation. The DAC output includes a variable gain

amplifier (TX DSA) with 40-dB range and 1-dB analog

and 0.125-dB digital steps.

The feedback path includes an 25-dB range DSA

driving a 3-GSPS RF sampling ADC, followed by a

DDC with up to 1200 MHz bandwidth.