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PGA460-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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PGA460-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 112 page  (CORE _ CLK) (DRV) f n f (DRV) f 0.2 kHz f 30 kHz u 11 PGA460-Q1 www.ti.com SLASEC8 – FEBRUARY 2017 Product Folder Links: PGA460-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) 7.3.2 Burst Generation The PGA460-Q1 device has a programmable frequency for the burst and number of pulse by configuring the FREQ and P1_PULSE/P2_PULSE registers. Use Equation 1 to calculate the frequency of burst for a range of 30 kHz to 80 kHz (FREQ_SHIFT bit set to 0). where • f is the frequency which can be from 0 to 200 as defined in the FREQUENCY register. (1) The actual driving frequency of the output stage is derived from the core clock frequency using Equation 1 and Equation 2 where • n is the ratio by which the main oscillator f(CORE_CLK) is divided. (2) The PULSE_P1 and PULSE_P2 registers can range from 0 to 31. When set to a value of M that is greater than 0, the M pulse pairs are generated on the OUTA and OUTB outputs. 7.3.2.1 Using Center-Tap Transformer The PGA460-Q1 device provides efficient burst generation by exciting the primary side of a center-tap transformer connected on the OUTA and OUTB pins through the complementary low-side FETs operating in a current limiting mode. The frequency of the burst is from 30 kHz to 80 kHz with the current limit from 50 mA to 500 mA. The frequency of the burst, the current limit for transformer primary current, and the number of burst pulses can be controlled by using the FREQUENCY, CURR_LIM_P1, CURR_LIM_P12, PULSE_P1, and PULSE_P2 parameters respectively. Figure 3 shows the functional block diagram for echo generation. |
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