AD9834BRUZ-REEL

The AD9834 is a 75 MHz, low-power DDS device capable of generating high-performance sine wave and triangular wave outputs. An on-chip comparator is also integrated to support square wave generation for clock applications. At a supply voltage of 3 V, power consumption is only 20 mW, making it ideal for power-sensitive applications. The AD9834 provides phase modulation and frequency modulation capabilities. The frequency register is 28 bits wide; at a clock rate of 75 MHz, a resolution of 0.28 Hz is achievable. Similarly, at a clock rate of 1 MHz, the AD9834 can achieve a resolution of 0.004 Hz. Frequency and phase modulation is implemented by loading registers via the serial interface, then toggling between registers using software or the FSELECT/PSELECT pins. The AD9834 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 from a 2.3 V to 5.5 V supply. The analog and digital sections are independent of each other and can be powered from separate supplies; for example, AVDD can be 5 V while DVDD can be 3 V. The AD9834 features a sleep pin (SLEEP) that allows external control of the power-down mode. Unused sections of the device can be powered down to minimize power consumption. For example, the DAC can be powered down when generating a clock output. The device is available in a 20-lead TSSOP package.

Applications

• Frequency excitation/waveform generation
• Frequency phase tuning and modulation
• Low-power RF/communication systems
• Liquid and gas flow measurement
• Sensor applications: proximity, motion, and defect detection
• Test and medical equipment

Key features

• Narrowband SFDR > 72 dB
• 2.3 V to 5.5 V supply voltage
• Output frequency up to 37.5 MHz
• Sine wave output / triangle wave output
• On-chip integrated comparator
• 3-wire SPI interface
• Extended temperature range: -40°C to +105°C
• Power-down option
• Power consumption: 20 mW (at 3 V)
• 20-lead TSSOP