AD9910BSVZ-REEL IC

Technical Specifications of AD9910BSVZ-REEL

Datasheet	AD9910BSVZ-REEL datasheet
Category	Integrated Circuits (ICs)
Family	Interface – Direct Digital Synthesis (DDS)
Manufacturer	Analog Devices Inc.
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Resolution (Bits)	14 b
Master fclk	1GHz
Tuning Word Width (Bits)	32 b
Voltage – Supply	1.8V, 3.3V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	100-TQFP Exposed Pad
Supplier Device Package	100-TQFP-EP (14×14)

AD9910BSVZ-REEL General Description

The AD9910 is a direct digital synthesizer (DDS) that supports sample rates of up to 1 GSPS and has an integrated 14-bit DAC. The AD9910 uses cutting-edge, exclusive DDS technology that significantly reduces power consumption while maintaining performance. The DDS/DAC combination creates a high-frequency, analog output synthesizer that can be digitally programmed and generate sinusoidal waves up to 400 MHz. The frequency, phase, and amplitude signal control parameters, which control the DDS, are available to the user. With its 32-bit accumulator, the DDS offers quick frequency hopping and high frequency tuning resolution. The tuning resolution at 1 GSPS sample rate is 0.23 Hz. Fast phase and amplitude switching capabilities are also made possible by the DDS.

The AD9910 is managed by serial I/O port programming of its internal control registers. To support different frequency, phase, or amplitude modulation combinations, the AD9910 has an integrated static RAM.

The AD9910 also supports a digitally controlled, user-defined, digital ramp mode of operation. The frequency, phase, or amplitude can all be changed linearly in this mode. A high-speed parallel data input connection is added to provide natural frequency, phase, amplitude, or polar modulation. The extended industrial temperature range is specified for the AD9910.

Theory Of Operation

• The AD9910 has four modes of operation.
• Single tone
• RAM modulation
• Digital ramp modulation
• Parallel data port modulation

The DDS can be controlled by varying its frequency, phase, or amplitude, and the modes correspond to the data sources used to provide these values. The data is automatically segmented based on the mode or designated control bits into various frequency, phase, and amplitude ranges. In single-tone operation, the programming registers for the serial I/O port supply the parameters used to control the DDS signal. When operating in RAM modulation mode, the internal RAM temporarily stores the parameters used to manage the DDS signal.

When operating in digital ramp modulation mode, a digital ramp generator supplies the DDS signal control parameters. Parameters for controlling the DDS signal are fed straight into the parallel port when modulation is performed using the parallel data port. Typically, each modulation mode only affects a single parameter of the DDS signal’s regulation (two in the case of the polar modulation format). Control parameters for the unmodulated DDS signal are saved in the relevant programming registers and sent to the DDS automatically, depending on the mode.

Also accessible is an OSK function for performing output shift keying independently. To perform this task, a dedicated digital linear ramp generator is used, which modifies the DDS’s amplitude setting exclusively. The DDS amplitude parameter is driven primarily by the OSK function rather than any other possible data sources. This means that when the OSK feature is activated, no additional data source can be used to control the amplitude of the DDS. It is possible to enable multiple modes simultaneously, even though they are described separately (including the OSK function). As a result, a whole new realm of possibilities opens up for creating sophisticated modulation schemes.

However, a built-in priority protocol prevents data from multiple sources from simultaneously controlling the same DDS signal parameter (see Table 5 in the Mode Priority section). WAVEFORM FOR A SINGLE TONE When in single-tone mode, the programming registers supply the settings for controlling the DDS signal. Profiles are separate registers that store the settings for manipulating DDS signals. There are a total of eight different profile registries to choose from. Each profile can be seen without affecting the others. For external profile selection, use PROFILE[2:0]. When the profile pins are toggled, the DDS is automatically updated to use the new profile’s parameters at the next rising edge of SYNC CLK.

Ram Modulation Mode

If the RAM enables bit is set, and the I/O UPDATE pin is asserted, the RAM enters modulation mode. This mode reads the parameters for controlling the modulated DDS signal straight from RAM. It’s worth noting that the RAM has a depth of 1024 words and uses 32-bit words. Using a complex internal state mechanism, the RAM provides a very versatile means of producing time-dependent waveforms of any kind. The rate at which terms are read from RAM and sent to the DDS can be adjusted using a programmable timer.

Because of this, the DDS receives 32-bit samples at a rate determined by the programmable timer. In addition, eight separate RAM profile registers allow for the programmable selection of the particular DDS signal control characteristics that serve as the destination for the RAM samples. The three external profile pins select a specific profile (PROFILE[2:0]).

The desired RAM profile is enabled by switching the profile pins’ states at the next rising edge of SYNC CLK. When operating in RAM modulation mode, the DDS carrier signal can have its amplitude, phase, or frequency modulated independently of one another. In addition, a polar modulation format can be used to split each RAM sample into a magnitude and phase component, with 16 bits devoted to the phase and 14 bits to the magnitude.

Ram Control Ram Overview

The AD9910 has a RAM that has a capacity of 1024 by 32 bits. The data load/retrieve mode, and the playback mode are the two primary modes of operation that the RAM possesses. The data load/retrieve mode is activated whenever the serial I/O port is used to either load data into the RAM or read data out of the RAM. Playback mode is activated when the contents of the RAM enable register are sent to one of the device’s internal data destinations.

The user can partition the RAM with up to eight separate time domain waveforms, but this depends on the playback mode selected. These waveforms serve as the input for the DDS signal control parameters, which enables the generation of signals with frequency, phase, amplitude, or polar modulation. Setting the RAM to help a bit in Control Function Register 1 allows for RAM operations to be performed; however, to make any changes to the state of this bit, either an I/O update or a profile change is required.

Conclusion

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