DDS ICs for frequency-agile wireless applications

8 August 2012 Telecoms, Datacoms, Wireless, IoT

Addressing the demand for direct digital synthesis (DDS) technology that meets the needs of wireless applications requiring fast hopping and/or sweeping, Analog Devices claims that it has more than tripled the clock speed of previously available DDS ICs.

Coupled with an on-chip, high-speed, 12-bit D/A converter, the AD9914 achieves a speed of 3,5 GSps, while the AD9915 runs to 2,5 GSPS. Both device cores support advanced digital programmable technology capable of synthesising frequency-agile, analog output sinusoidal waveforms at up to 1,4 GHz, such as those used in a wide range of communications applications, such as wireless base stations, defence and commercial radar, and secure communications systems.

The ICs feature a 32-bit parallel port enabling extremely fast changes to frequency, phase and the amplitude of the output signal, and the programmable modulus function which extends the use of DDS ICs into applications that require exact rational relationships such as signal generators and other lab equipment.

The AD9914 and AD9915 settle in nanoseconds with granularity well below 200 pHz. According to AD, other approaches, including FPGAs with embedded DDS functions, have difficulty matching the SFDR (better than -50 dBc) of AD’s DDS ICs on output signals over 1 GHz and require higher operating power and the addition of a discrete D/A converter to synthesise the sine wave.

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