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PT2256V-SN Datasheet(PDF) 5 Page - Princeton Technology Corp |
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PT2256V-SN Datasheet(HTML) 5 Page - Princeton Technology Corp |
5 / 19 page Tel:886-2-66296288 Fax:886-2-29174598 URL:http://www.princeton.com.tw PT2256V V1.2 - 5 - August, 2006 Electronic Volume Controller IC PT2256V DC OUTPUT FOR VOLUME LEVEL The DC Output for the Volume Level Meter is internally connected to the D/A Converter. PT2256V has 8 stages of output voltage with each stage corresponding to a particular volume level. Please refer to the table below: Step Attenuation (dB) Output Voltage (V) 0-3 0-6 7/8 VDD 4-7 8-14 6/8 VDD 8-11 16-22 5/8 VDD 12-15 24-30 4/8 VDD 16-19 32-38 3/8 VDD 20-23 40-50 2/8 VDD 24-27 54-66 1/8 VDD 28-31 70-∞ 0 UP/DOWN VOLUME CONTROL PT2256V features two Volume Control Pins, namely: UP and DN. UP is the control pin used to increase volume level while the DN is the control pin used to decrease the volume level. Thus, volume level may regulated using the Up or Down Keys. These keys are operated on a 1 step/1 push volume level control when UP or DN keys are set to “L” Level. If the keys are continuously pressed (input “Low”), then the volume level continuously steps up or down as the case maybe. Please refer to the diagram below for the timing of the key input. tT a /UP, /DN Input Volume Level Control Notes: 1. t= Preventive Time for Chattering (2.2 x 1/fosc ) 2. T= Switching Time to Automatic Mode (10 x 1/fosc) 3. a=Up, Down Speed (2x1/fosc) |
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