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DA7212 Datasheet(PDF) 36 Page - Renesas Technology Corp |
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DA7212 Datasheet(HTML) 36 Page - Renesas Technology Corp |
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36 / 136 page  DA7212 Ultra-Low Power Stereo Codec Datasheet Revision 3.5 05-Jan-2022 CFR0011-120-00 36 of 135 © 2022 Renesas Electronics 13.10 Output Signal Chain The DA7212 has two audio outputs. These are a stereo Class-G headphone driver, and a mono Class-AB speaker driver. Two output mixers allow mixing of signals from the DACs and the analogue bypass paths, with output going to any or all of the three output PGAs. These output paths are illustrated in Figure 11. from DAC_L from AUX_L_AMP from MIXIN_L from DAC_R from MIXIN_R HP_L HP_R SP_P SP_N HP_L_AMP HP_R_AMP -57dB to +6dB in 1dB steps from AUX_R_AMP -48dB to +15dB in 1dB steps LINE_AMP -57dB to +6dB in 1dB steps Figure 11: Analogue output signal paths and gain ranges 13.11 Stereo Audio DAC The integrated stereo DAC is suitable for high quality audio playback by MP3 players and by portable multimedia players of all kinds. The left and right channels of the DAC can be individually enabled using controls DAC_L_EN and DAC_R_EN. Each channel includes individual gain settings that are controllable in 0.75 dB steps from -78 dB to 12 dB using DAC_L_DIGITAL_GAIN_STATUS and DAC_R_DIGITAL_GAIN_STATUS. The currently active gain settings are stored in DAC_L_GAIN_STATUS and DAC_R_GAIN_STATUS registers. On the dedicated DAC_L_CTRL and DAC_R_CTRL registers, settings such as mute and ramping of gain changes can be configured. If ramping is enabled using the control bits DAC_L_RAMP_EN or DAC_R_RAMP_EN, the rate of the ramping can be controlled using GAIN_RAMP_RATE. A digital high-pass filter for each DAC channel is implemented with a 3 dB cut-off frequency controlled by DAC_AUDIO_HPF_CORNER. The high-pass filter is enabled by control DAC_HPF_EN. After Reset, the high pass filters for both channels are enabled by default. |
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