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AD9958BCPZ - 2-Channel 500 MSPS DDS with 10-Bit DACs The AD9958 consists of two independently programmable DDS channels. Since both channels share a common system clock, they are inherently synchronized. If more than two channels are required, synchronizing multiple AD9958s is a simple task. The AD9958 features independent frequency, phase, and amplitude control of each channel; this allows for the correction of imbalances due to analog processing such as filtering, amplification, or PCB layout related mismatches. The AD9958 supports frequency sweeping for radar and instrumentation applications. The AD9958 uses advanced DDS technology which provides low power dissipation with high performance. The device incorporates two integrated high speed 10-bit DAC with excellent wideband and narrowband SFDR. Each DDS has a 32- bit frequency tuning word, 14-bits of phase offset, and a 10-bit output scale multiplier. Each DAC has it own programmable reference to enable a different full scale current for each channel. Each DDS acts as a high resolution frequency divider with the REF_CLK as the input and the DAC providing the output. The REF_CLK input source is common to both DDS channels, and can be driven directly, or used in combination with an integrated REF_CLK multiplier (using a PLL) up to a maximum of 400 MSPS. The REF_CLK multiplication factor is programmable from 4 to 20, in integer steps. The REF_CLK input features an oscillator which supports either a crystal as a source, or may be bypassed. The crystal frequency must be between 20MHz and 30MHz. The crystal can be used with or without the REF_CLK multiplier. The DAC outputs are supply referenced and must be terminated into AVDD by a resistor, or an AVDD center-tapped transformer. The AD9958 operates over the extended industrial temperature range of -40ºC to +85ºC. * Agile L.O. frequency synthesis * Phased array radar / sonar (all content is the responsibility of the poster) |
L-King@oklahomaselltoday.com (Leola King) for more information. All emails will be forwarded to the poster's actual email address.