Quad, 16-Bit, 12 GSPS RF DAC with Wideband Channelizers

The AD9177 is a highly integrated device with four 16-bit, 12 GSPS maximum sample rate, RF digital-to-analog converter (DAC) cores supporting up to eight baseband channels. The device is well suited for applications requiring wideband DACs to process signals of wide instantaneous bandwidth. The device features an 8-lane, 24.75 Gbps JESD204C or 15.5 Gbps JESD204B data receiver (JRx) port, an on-chip clock multiplier, and digital signal processing (DSP) datapaths capable of processing complex signals for wide-band or multiband direct to RF applications, phase array radar systems, and electronic warfare applications. The DSP datapaths can be bypassed to allow a direct connection between the data receiver port and the DAC cores.

For direct digital synthesis (DDS) applications, the AD9177 can be operated without a data receiver port to generate multiple sine wave tones of varying frequencies. The main numerically controlled oscillator (NCO) block inside each of the four course digital upconverters (DUCs) contains one 48-bit NCO and a bank of thirty one 32-bit NCOs, each with an independent phase accumulator. Similarly, the main NCO block inside each of the course and fine digital downconverters (DDCs) in the receive datapath contains a bank of sixteen 48-bit NCOs that can be looped into the transmit datapath for processing ahead of the course DUCs and DAC outputs. Combined with general-purpose input/output (GPIO) controls for frequency hopping, preconfigurable profile selection, and the ability to synchronize the NCOs to a common trigger using the SYSREF input port, this bank allows phase coherent fast frequency hopping (FFH) for applications where multiple devices are synchronized or where NCO frequencies are continuously adjusted during operation.

APPLICATIONS

* Wireless communications infrastructure

* Microwave point-to-point, E-band, and 5G mm wave

* Broadband communications systems

* DOCSIS 3.1 and 4.0 CMTS

* Phased array radar and electronic warfare

* Electronic test and measurement systems

* Flexible reconfigurable common platform design

* 4 DAC cores connected to various DSP and bypass datapaths

* Supports single, dual, and quad band

* Datapaths and DSP blocks are fully bypassable

* On-chip PLL with multichip synchronization

* External RFLK input option for off-chip PLL

* Maximum DAC sample rate up to 12 GSPS

* Maximum data rate up to 12 GSPS using JESD204C

* Useable analog bandwidth to 8 GHz

* DAC ac performance at 12 GSPS

* Full-scale output current range: 6.43 mA to 37.75 mA

* Two tone IMD3 (−7 dBFS per tone): −78.9 dBc

* NSD, single tone at 3.7 GHz: −155.1 dBc/Hz

* SFDR, single tone at 3.7 GHz: −70 dBc

* Versatile digital features

* Selectable interpolation filters

* Configurable or bypassable DUCs

* 8 fine complex DUCs and 4 coarse complex DUCs

* 48-bit NCO per DUC

* Option to bypass fine and coarse DUC

* Programmable delay per datapath