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DAC5688 Datasheet(PDF) 32 Page - Texas Instruments |
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DAC5688 Datasheet(HTML) 32 Page - Texas Instruments |
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32 / 55 page  X X X X X X Q(t) I(t) 11 11 10 qmc_gaina(10:0) qmc_gain b (10:0) qmc _phase (9 :0) S S 13 13 qmb_offset {-4096, - 4095, … ,4095} qma_offset {-4096, - 4095, … ,4095} I Q S DAC5688 SLLS880B – DECEMBER 2007 – REVISED MAY 2010 www.ti.com Quadrature Modulator Correction (QMC) The Quadrature Modulator Correction (QMC) block provides a means for adjusting the gain and phase of the complex signal. At a quadrature modulator output, gain and phase imbalances result in an undesired sideband signal. The block diagram for the QMC is shown in Figure 30. The QMC block contains 3 programmable parameters: qmc_gaina(10:0), qmc_gainb(10:0) and qmc_phase(9:0). Registers qmc_gaina(10:0) and qmc_gainb(10:0) control the I and Q path gains and are 11 bit values with a range of 0 to approximately 2. This value is used to scale the signal range. Register qmc_phase(9:0) controls the phase imbalance between I and Q and is a 10-bit value that ranges from –1/8 to approximately +1/8. This value is multiplied by each Q sample then summed into the I sample path. This operation is a simplified approximation of a true phase rotation and covers the range from –7.5 to +7.5 degrees in 1024 steps. Figure 30. QMC Block Diagram DAC Offset Control The qmc_offseta(12:0) and qmc_offsetb(12:0) values can be used to independently adjust the I and Q path DC offsets. Both offset values are in represented in 2s-complement format with a range from –4096 to 4095. The offset value adds a digital offset to the digital data before digital-to-analog conversion. Since the offset is added directly to the data it may be necessary to back off the signal to prevent saturation. Both data and offset values are LSB aligned. Figure 31. DAC Offset Block 32 Submit Documentation Feedback Copyright © 2007–2010, Texas Instruments Incorporated Product Folder Link(s): DAC5688 |
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