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GA3219D-E1-T Datasheet(PDF) 9 Page - ON Semiconductor |
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GA3219D-E1-T Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 14 page VENTURE GA3219 www.onsemi.com 9 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 The Volume Control (VC) can be either external or programmable. If VC is programmed for external operation, a variable resistor should be connected to the 9 bit A/D converter. The external VC can be configured to work with either a two−terminal 200 k W variable resistor or a three−terminal 0.1 M W – 1 MW variable resistor. In two−terminal configuration, the VC is connected between GND, Vreg and the VC input. If using a two−terminal VC, it must be calibrated before use. Calibration is not necessary with a three−terminal connection. Hysteresis is built into the VC circuitry to prevent unintentional volume level toggling. A log taper potentiometer is recommended so that gain in dB would be linear with potentiometer rotation. The range of VC is adjustable and can be set between 1 dB (min) and 42 dB (max). AGC−O and Peak Clipper The output compression−limiting block (AGC−O) is an output limiting circuit whose compression ratio is fixed at ∝:1. The threshold level is programmable. The AGC−O module has programmable attack and release time constants. The AGC−O on Venture GA3219 has optional adaptive release functionality. When this function is enabled, the release time varies depending on the environment. In general terms, the release time becomes faster in environments where the average level is well below the threshold and only brief intermittent transients exceed the threshold. Conversely, in environments where the average level is close to the AGC−O threshold, the release time applied to portions of the signal exceeding the threshold is longer. The result is an effective low distortion output limiter that clamps down very quickly on momentary transients but reacts more smoothly in loud environments to minimize compression pumping artifacts. The programmed release time is the longest release time applied, while the fastest release time is 16 times faster. For example, if a release time of 128 ms is selected, the fastest release time applied by the AGC−O block is 8 ms. Venture GA3219 also includes the Peak Clipper block for added flexibility. Memory Select Switches One or two, two−pole Memory Select (MS) switches can be used with Venture GA3219. This enables users tremendous flexibility in switching between configurations. These switches may be either momentary or static and are configurable to be either pull−up or pull−down through the settings tab in IDS. Up to four memories can be configured on Venture GA3219. Memory A must always be valid. All memory select options are selectable via the settings tab in IDS. Momentary Switch on MS This mode uses a single momentary switch on MS (Pin4) to change memories. Using this mode causes the part to start in memory A, and whenever the button is pressed, the next valid memory is loaded. When the user is in the last valid memory, a button press causes memory A to be loaded. This mode is set by programming the ‘MSSMode’ parameter to ‘Momentary’ and ‘Donly’ to ‘disabled’. Example: If 4 valid memories: ABCDABCDA … If 3 valid memories: ABCABCA … If 2 valid memories: ABABA … If 1 valid memories: AAA … Momentary Switch on MS, Static Switch on MS2 (Jump to Last Memory) This mode uses a static switch on MS2 (Pin5) and a momentary switch on MS (Pin4) to change memories. If the static switch is OPEN, the part starts in memory A and behaves like momentary, with the exception that memory D is not used. If the static switch on MS2 is set to HIGH, the part automatically jumps to memory D (occurs on start−up or during normal operation). In this setup, the momentary switch’s state is ignored, preventing memory select beeps from occurring. When MS2 is set to OPEN, the part loads in the last select memory. This mode is set by programming the ‘MSSMode’ parameter to ‘Momentary’ and ‘Donly’ to ‘enabled’. Example: If MS2 = OPEN and there are 4 valid memories: ABCABCA … If MS2 = OPEN and there are 3 valid memories: ABABA … If MS2 = HIGH: D … |
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