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CDB4215 Scheda tecnica(PDF) 10 Page - Cirrus Logic |
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CDB4215 Scheda tecnica(HTML) 10 Page - Cirrus Logic |
10 / 52 page headphone outputs and a mono monitor speaker output. Output Level Attenuator The DAC outputs are routed through an attenu- ator, which provides 0 dB to 94.5 dB of attenuation, adjustable in 1.5 dB steps. Level changes are implemented using both analog and digital attenuation techniques. Level changes only take effect on zero crossings to minimize audible artifacts. The requested level change is forced if an analog zero crossing does not occur within 511 frames (10.6 ms at a 48 kHz frame rate). A separate zero crossing detector exists for each channel. Line Outputs LOUTR and LOUTL output an analog signal, centered around the CMOUT voltage. The mini- mum recommended load impedance is 8 k Ω. Figure 1 shows the recommended 1.0 µF DC blocking capacitor with a 40 k Ω resistor to ground. When driving impedances greater than 10 k Ω, this provides a high pass corner of 20 Hz. These outputs may be muted. Headphone Outputs HEADR and HEADL output an analog signal, centered around the HEADC voltage. The de- fault headphone output level (OLB = 0) contains an optional 3 dB gain over the line outputs which provides reasonable listening levels, even with small amplitude digital sources. These out- puts have increased current drive capability and can drive a load impedance as low as 48 Ω. Ex- ternal 12 Ω series resistors reduce output level variations with different impedance headphones. The common return line from driving head- phones should be connected to HEADC, which is biased to the CMOUT voltage. This removes the need for AC coupling, and also controls where the return currents flow. All three head- phone output lines are short-circuit protected. These outputs may be muted. Speaker Output MOUT1 and MOUT2 differentially drive a small loudspeaker, whose impedance should be greater than 32 Ω. The signal is a summed version of the right and left line output, tapped off prior to the mute function, but after the attenuator. The speaker output may be independently muted. With OLB = 0, the speaker output also contains a 3 dB gain over the line outputs. When OLB = 1, the speaker outputs are driven at the same level as the line outputs. Some small speakers distort heavily when pre- sented with low frequency energy. A high-pass filter helps eliminate the low frequency energy and can be implemented by AC coupling both speaker terminals with a resistor to ground, on the speaker side of the DC blocking capacitors. The values selected would depend on the speaker chosen, but typical values would be 22 µF for the capacitors, with the positive side connected to the codec, and 50 k Ω resistors. This circuit is contained on the CDB4215 evaluation board as shown in the end of this data sheet. Input Monitor Function To allow monitoring of the input audio signal, the output of the ADCs can be routed through a monitor path attenuator, then digitally mixed into the input data for the DACs (see the front page block diagram). Changes in the input gain or output level settings directly affect the monitor level. If full scale data from the ADCs is added to full scale digital data from the serial interface, clipping will occur. Calibration Both output offset voltage and input offset error are minimized by an internal calibration cycle. At least one calibration cycle must be invoked CS4215 10 DS76F2 |
Codice articolo simile - CDB4215 |
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Descrizione simile - CDB4215 |
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