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CS6422-CSZ Datasheet(PDF) 11 Page - Cirrus Logic |
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CS6422-CSZ Datasheet(HTML) 11 Page - Cirrus Logic |
11 / 48 page CS6422 11 of higher amplitude will clip the ADC input and will result in poor echo canceller performance. See Section 4., “Design Considerations” for more de- tails. The outputs are delta-sigma digital to analog con- verters (DACs) and have similar requirements to the ADCs. The DACs are pre-compensated to ex- pect a single-pole RC filter with a corner frequency at 4 kHz. The full scale voltage output from a DAC is 1.1 Vrms (3.1 Vpp) maximum, 1 Vrms typical, bi- ased around 2.12 VDC. 3.1.1 Acoustic Interface The pins API (pin 20), APO (pin 18), AO (pin 3), and MB (pin 19) form the Acoustic Interface. A block diagram of the Acoustic Interface is shown in Figure 6. API and APO are, respectively, the input and out- put of the built-in microphone pre-amplifier. The pre-amplifier is an inverting amplifier with a fixed gain of 34 dB biased around an input offset voltage of 2.12 V. APO is the output of the pre-amplifier after a 1 k Ω (typical) resistor. The circuitry con- nected to the amplifier input must present low source impedance (<100 Ω) to the API pin or the gain will be reduced. When using the internal mic preamp, a 0.022 µF capacitor should be placed be- tween APO and ground to provide the anti-aliasing filter required by the ADC, as shown in Figure 4. The pre-amplifier may be bypassed by clearing the ‘Mic’ bit (Register 0, bit 15) using the Microcontrol- ler Interface (see Section 3.2, “Microcontroller Inter- face”). If the internal mic preamp is not used, a 0.022 µF capacitor should be tied between API and ground, and APO should be driven directly. In this case, the signal into APO must be low-pass filtered by a single-pole RC filter with a corner frequency at 8 kHz (see Figure 5). Following the pre-amplifier is a programmable an- alog gain stage, called TGain, which is controlled MB APO 20 AO (0,6,9.5,12 dB) ADC DAC DAC ADC D S P NI 17 NO 4 FAR-END Transmit Path Receive Path API 1k Ω Voltage Reference 34 dB (0,6,9.5,12 dB) NEAR-END 3 TGain RGain CS6422 Mic 19 18 Figure 6. Analog Interface CS6422 DS295F1 11 |
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