2T3R, 600-MHz to 12-GHz, RF-sampling AFE, 12-GSPS DACs, 3-GSPS ADCs, 1.2-GHz max IBW

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 12GHz,

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 1200MHz 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 40dB range and 1-dB analog

and 0.125dB digital steps.

Two receiver chains includes a 25dB range DSA

(Digital Step Attenuator), followed by a 3GSPS 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 1200MHz per RX

channel.

An additional receiver channel has a single

wideband DDC supporting up to 1200MHz bandwidth.