2-transmit, 2-receive RF-sampling transceiver, 5-MHz to 7.4-GHz, max 400-MHz IBW

The AFE7903 is a high

performance, wide bandwidth multi-channel transceiver, integrating two RF sampling

transmitter chains and two RF sampling receiver chains. With operation up to 7.4GHz,

this device enables direct RF sampling in the HF, VHF, UHF, L, S and C-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 400MHz of signal bandwidth. 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 data bandwidth up to 400MHz for two

RX.

The device contains a SYSREF timing

detector to allow optimization of the SYSREF input timing relative to the device

clock.

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