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CS4237B Datasheet(PDF) 91 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 91 Page - Cirrus Logic |
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91 / 114 page  The AUX2 line-level inputs have an extra pin, CMAUX2, which provides a pseudo-differential input for both LAUX2 and RAUX2. This pin takes the common-mode noise out of the AUX2 inputs when connected to the ground coming from the AUX2 analog source. Connecting the AUX2 pins as shown in Figure 27 provides extra noise attenuation coming from the CDROM drive, thereby producing a higher quality signal. Since the better the resistors match, the better the common-mode attenuation, one percent resistors are recommended. If CMAUX2 is not used, it should be connected through an AC cap to ana- log ground. Microphone Level Inputs The microphone level inputs, LMIC and RMIC, include a selectable -22.5 dB to +22.5 dB gain stage for interfacing to an external microphone. An additional 20 dB gain block is available in the path to the output mixer. The 20 dB gain block can be switched off to provide another ste- reo line-level input. Figure 28 illustrates a single-ended microphone input buffer circuit that will support lower gain mics. If a mono micro- phone is all that is desired, the RMIC input should be connected to the output of the mono op amp, used for LMIC, through its own AC coupling capacitor. The circuit in Figure 28 sup- ports dynamic mics and phantom-powered mics that use the right channel of the jack for power. Mono Input The mono input, MIN, is useful for mixing the output of the "beeper" (timer chip), provided in all PCs, with the rest of the audio signals. The attenuation control allows 16 levels in -3dB steps. In addition, a mute control is provided. The attenuator is a single channel block with the resulting signal sent to the output mixer where it is mixed with the left and right outputs. Fig- ure 29 illustrates a typical input circuit for the Mono In. If MIN is driven from a CMOS gate, the 4.7k Ω should be tied to AGND instead of VA+. Although this input is described for a low- q ual ity be epe r, the in put is o f the same high-quality as all other analog inputs and may be used for other purposes. At power-up, the MIN line is connected directly to the MOUT pin (with 9 dB of attenuation) allowing the initial beeps, heard when the computer is initializing, to pass through. 6.8 k Ω 6.8 k Ω 1.0 µF 1.0 µF RAUX2 LAUX2 6.8 k Ω 6.8 k Ω 3.4 k Ω CMAUX2 1.0 µF 3.4 k Ω (All resistors 1%) Figure 27. Differential CDROM In 0.1 µF 2.7 nF NPO 10 µF + 600 Ω 4.7 k Ω 47 k Ω MC33078 or MC33178 0.33 µF VREF LMIC 1 µF + RMIC 0.33 µF X7R 2 k Ω 47 k Ω Figure 28. Left or Mono Microphone Input 2.7 nF 47 k Ω 4.7 k Ω 0.1 µF MIN 1 +5VA (Low Noise) or AGND - if CMOS Source Figure 29. Mono Input DS213PP4 CS4237B 91 |
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Similar Description - CS4237B |
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