1 Features

• Dual RF sampling 12-GSPS transmit DACs

• Triple RF sampling 3-GSPS receive ADCs

• Maximum RF signal bandwidth: 1200 MHz

• RF frequency range: 600 MHz - 12 GHz

• Digital step attenuators (DSA):

– TX: 40 dB range, 0.125-dB steps

– RX: 25 dB range, 0.5-dB steps

• Single or dual-band DUC or DDCs

• 16x NCOs per TX or RX

• 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 29.5 Gbps

– Subclass 1 multi-device synchronization

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

2 Applications

• Radar

• Seeker front end

• Defense radio

• Tactical communications infrastructure

• Wireless communications test

3 Description

The AFE7955 is a high performance, wide bandwidth

multi-channel transceiver, integrating two RF sampling

transmitter chains and 3 RF sampling receiver chains.

With operation up to 12 GHz, this device enables

direct RF sampling in the L, S, C and X-band

frequency ranges without the need for additional

frequency conversions stages. This improvement in

density and flexibility enables high-channel-count,

multi-mission systems.

The TX signal paths support interpolation and digital

up conversion options that deliver up to 1200 MHz

of signal bandwidth per TX channel. The output

of the DUCs drives a 12-GSPS 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 40-

dB range and 1-dB analog and 0.125-dB digital steps.

Two receiver chains includes a 25-dB range DSA

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

ADC (analog-to-digital converter). The two receiver

channels have 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 1200 MHz per RX channel.

An additional receiver channel has a single wideband

DDC supporting up to 1200 MHz bandwidth.