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R3710 Datasheet(PDF) 11 Page - ON Semiconductor |
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R3710 Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 18 page  RHYTHM R3710 www.onsemi.com 11 the last band, and each one provides up to 24 dB of gain adjustment in 1 dB increments. Biquad Filters Additional frequency shaping can be achieved by configuring generic biquad filters. The transfer function for each of the biquad filters is as follows: H(z) + b0 ) b1 z−1 ) b2 z−2 1 ) a1 z−1 ) a2 z−2 Note that the a0 coefficient is hard−wired to always be ‘1’. The coefficients are each 16 bits in length and include one sign bit, one bit to the left of the decimal point, and 14 bits to the right of the decimal point. Thus, before quantization, the floating−point coefficients must be in the range −2.0 ≤ x < 2.0 and quantized with the function: round x 214 After designing a filter, the quantized coefficients can be entered into the PreBiquads or PostBiquads tab in the Interactive Data Sheet. The coefficients b0, b1, b2, a1, and a2 are as defined in the transfer function above. The parameters meta0 and meta1 do not have any effect on the signal processing, but can be used to store additional information related to the associated biquad. The underlying code in the product components automatically checks all of the filters in the system for stability (i.e., the poles have to be within the unit circle) before updating the graphs on the screen or programming the coefficients into the hybrid. If the Interactive Data Sheet receives an exception from the underlying stability checking code, it automatically disables the biquad being modified and display a warning message. When the filter is made stable again, it can be re−enabled. Also note that in some configurations, some of these filters may be used by the product component for microphone/telecoil compensation, low−frequency EQ, etc. If this is the case, the coefficients entered by the user into IDS are ignored and the filter designed by the software is programmed instead. For more information on filter design refer to the Biquad Filters In Paragon® Digital Hybrid information note. Volume Control and Switches External Volume Control The volume of the device can either be set statically via software or controlled externally via a physical interface. R3710 supports both analog and digital volume control functionality, although only one can be enabled at a time. Digital control is supported with either a momentary switch or a rocker switch. In the latter case, the rocker switch can also be used to control memory selects. Analog Volume Control The external volume control works with a three−terminal 100 k W – 360 kW variable resistor. The volume control can have either a log or linear taper, which is selectable via software. It is possible to use a VC with up to 1 M W of resistance, but this could result in a slight decrease in the resolution of the taper. Digital Volume Control The digital volume control makes use of two pins for volume control adjustment, VC and D_VC, with momentary switches connected to each. Closure of the switch to the VC pin indicates a gain increase while closure to the D_VC pin indicates a gain decrease. Figure 7 shows how to wire the digital volume control to R3710. The digital volume control can be setup to adjust both volume levels and memory configurations depending on the length of time the momentary switch is depressed. It is also possible to read and write the digital volume control with the ARK software. Using these software functions will lock out the digital volume control until the next time the hybrid is powered on. Figure 7. Wiring for Digital Volume Control D_VC VC GND Memory Select Switches One or two, two−pole Memory Select (MS) switches can be used with R3710. This enables user’s tremendous flexibility in switching between configurations. Up to four memories can be configured and selected by the MS switches on R3710. Memory A must always be valid. The MS switches are either momentary or static and are fully configurable through IDS in the IDS setting tab. |
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