AD9838

www.DataSheet4U.net 11 mW Power, 2.3 V to 5.5 V, Complete DDS AD9838 FEATURES 2.3 V to 5.5 V power supply MCLK speed: 16 MHz (B grade), 5 MHz (A grade) Output frequency up to 8 MHz Sinusoidal and triangular outputs On-board comparator 3-wire SPI interface Extended temperature range: −40°C to +125°C Power-down option 11 mW power consumption at 2.3 V 20-lead LFCSP Capability for phase modulation and frequency modulation is provided. The frequency registers are 28 bits wide: with a 16 MHz clock rate, resolution of 0.06 Hz can be achieved; with a 5 MHz clock rate, the AD9838 can be tuned to 0.02 Hz resolution. Frequency and phase modulation are configured by loading registers through the serial interface and by toggling the registers using software or the FSELECT and PSELECT pins, respectively. The AD9838 is written to via a 3-wire serial interface. This serial interface operates at clock rates up to 40 MHz and is compatible with DSP and microcontroller standards. The device operates with a power supply from 2.3 V to 5.5 V. The analog and digital sections are independent and can be run from different power supplies; for example, AVDD can equal 5 V with DVDD equal to 3 V. The AD9838 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 current consumption. For example, the DAC can be powered down when a clock output is being generated. The AD9838 is available in a 20-lead L...