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AD9910 Datasheet(PDF) 11 Page - Analog Devices |
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AD9910 Datasheet(HTML) 11 Page - Analog Devices |
11 / 13 page PRELIMINARY TECHNICAL DATA AD9910 Rev. PrD| Page 11 of 13 RAM MODULATION MODE In RAM modulation mode (Figure 5) the modulated DDS sig- nal control parameter(s) are supplied directly from RAM. The RAM contains 1024 32-bit words. It provides a very flexible method for generating arbitrary, time-dependent data patterns. The rate at which words are extracted from the RAM is con- trolled by a programmable timer. Thus, each word can be thought of as a 32-bit sample, which successive samples deliv- ered at a sample rate determined by the programmable timer. The destination of the samples is also under program control. That is, the sample can be routed to any of the three DDS con- trol parameters; frequency, phase, and amplitude. The ability to generate a time-dependent amplitude, phase, or frequency sig- nal enables modulation of any one of the parameters controlling the DDS carrier signal. In addition, a polar modulation format is also available, in which each RAM sample is partitioned into a magnitude and phase component: 16 bits phase allocated to phase and 14 bits allocated to magnitude. NOTE: When the OSK function is enabled, its amplitude data overrides any RAM data that is destined for the DDS amplitude control parameter. Figure 5: RAM modulation mode LINEAR RAMP MODULATION MODE In linear ramp modulation mode (Figure 6), the modulated DDS signal control parameter is supplied directly from Linear Ramp Generator. The ramp generation parameters are con- trolled via the serial I/O port. The ramp generation parameters allow the user to control both the rising and falling slopes of the ramp. The upper and lower boundaries of the ramp, the step size and step rate of the rising portion of the ramp, and the step size and step rate of the falling portion of the ramp are all programmable. The ramp is digitally generated with 32-bit output resolution. The 32-bit output of the Linear Ramp Generator can be pro- grammed to represent frequency, phase, or amplitude. When programmed to represent frequency all 32 bits are used. How- ever, when programmed to represent phase or amplitude, only the 16 MSBs or 14 MSB, respectively, are used. The ramp direction (rising/falling) is controlled externally by the LSCTL pin. An additional pin (LSHOLD) allows the user to freeze the ramp generator at its present state. NOTE: When the OSK function is enabled, its amplitude data overrides any Linear Ramp data that is destined for the DDS am- plitude control parameter. |
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