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20mW Power, 2.3V to 5.5V, 75 MHz Complete DDS (Direct Digital Synthesizer)
The AD9834 is a 75MHz low power DDS device capable of producing high performance sine and triangular outputs. It also has an on-board comparator that allows a square wave to be produced for clock generation. Consuming only 20mW of power at 3V makes the AD9834 an ideal candidate for powersensitive applications. Capability for phase modulation and frequency modulation is provided. The frequency registers are 28 bits; with a 75MHz clock rate, resolution of 0.28Hz can be achieved. Similarly, with a 1MHz clock rate, the AD9834 can be tuned to 0.004Hz resolution. Frequency and phase modulation are affected by loading registers through the serial interface and toggling the registers using software or the FSELECT pin and PSELECT pin, respectively. The AD9834 is written to using a 3-wire serial interface. This serial interface operates at clock rates up to 40MHz and is compatible with DSP and microcontroller standards. The device operates with a power supply from 2.3V to 5.5V. The analog and digital sections are independent and can be run from different power supplies, for example, AVDD can equal 5V with DVDD equal to 3V. The AD9834 has a power-down pin (SLEEP) that allows external control of the power-down mode. Sections of the device that are not being used can be powered down to minimize the current consumption. For example, the DAC can be powered down when a clock output is being generated.
* Narrow-band SFDR >72dB * 2.3V to 5.5V power supply * Output frequency up to 37.5MHz * Sine output/triangular output * On-board comparator * 3-wire SPI interface * Extended temperature range: -40°C to +105°C * Power-down option * 20mW power consumption at 3V
* Frequency stimulus/waveform generation * Frequency phase tuning and modulation * Low power RF/communications systems * Liquid and gas flow measurement * Sensory applications: proximity, motion, and defect detection * Test and medical equipment