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Maxim rolls out 16bit 5.9Gsps modulating RF DAC

Posted: 29 Dec 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Maxim Integrated? RF? DAC? modulator? digital video?

Maxim Integrated has released what it describes as a high-performance interpolating and modulating 16bit 5.9Gsps RF DAC that can directly synthesise up to 600MHz of instantaneous bandwidth from DC to frequencies greater than 2.8GHz. According to the company, the MAX5869 is optimised for digital video broadcast and cable applications and meets spectral mask requirements for a broad set of communication standards such as DVB-T, DVB-T2, DVB-C2, DVB-S2, DVB-S2X, ISDB-T, EPoC and DOCSIS 3.0/3.1.

The device integrates interpolation filters, a digital quadrature modulator, a numerically controlled oscillator (NCO), clock multiplying PLL+VCO and a 14bit RF DAC core. The user-configurable 5x, 6x, 6.67x, 8x, 10x, 12x, 13.33x, 16x, 20x or 24x, linear phase interpolation filters simplify reconstruction filtering, while enhancing passband dynamic performance, and reduce the input data bandwidth required from an FPGA/ASIC. The NCO allows for fully agile modulation of the input baseband signal for direct RF synthesis.

The MAX5869 accepts 16bit input data via a four-lane JESD204B SerDes data input interface that is Subclass-0 and Subclass-1 compliant. The interface can be configured for 1, 2, or 4 lanes and supports data rates up to 10Gb/s per lane allowing flexibility to optimise the I/O count and speed.

The MAX5869 clock input has a flexible clock interface and accepts a differential sine-wave, or square-wave input clock signal. A bypassable clock multiplying PLL and VCO can be used to generate a high-frequency sampling clock. The device outputs a divided reference clock to ensure synchronisation of the system clock and DAC clock. In addition, multiple devices can be synchronised using JESD204B Subclass-1.

The MAX5869 uses a differential current-steering architecture and can produce a 0dBm full-scale output signal level with a 50Ω load. Operating from 1.8V and 1.0V power supplies, the device consumes 2.5W at 4.9Gsps. The device is offered in a compact 144-pin, 10mm x 10mm, FCCSP package and is specified for the extended industrial temperature range (-40°C to 85°C).

Applications of the device include digital video broadcast: DVB-T/DVB-T2/ISDB-T modulators and DVB-C2/DVB-S2/DVB-S2X modulators; downstream DOCSIS CMTS modulators; and Ethernet PON over Coax (EPoC).





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