4-transmit, 6-receive RF-sampling transceiver, 5-MHz to 7.4-GHz, max 1200-MHz IBW

The AFE7900

is a high performance, wide bandwidth multi-channel transceiver, integrating four RF

sampling transmitter chains, four RF sampling receiver chains and two RF sampling

feedback chains (six RF sampling ADCs total). With operation up to 7.4 GHz, this device

enables direct RF sampling in the 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 1200 MHz of

signal bandwidth for four TX or 2400 MHz for two TX. 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.

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. Flexible

decimation options provide optimization of data bandwidth up to 1200 MHz for four RX

without FB paths or 600 MHz with two FB paths (1200 MHz BW each).

The device contains a SYSREF

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

device clock.