CS6422-CS Cirrus Logic Inc, CS6422-CS Datasheet - Page 25

• Manufacturer Part Number: CS6422-CS
• Description: IC CODEC SPKRPHONE 2CH 20-SOIC
• Manufacturer: Cirrus Logic Inc
• Type: Audio Processorr

Specifications of CS6422-CS

• Mounting Type: Surface Mount
• Package / Case: 20-SOIC
• Applications: Speakerphones
• Peak Reflow Compatible (260 C): No
• Termination Type: SMD
• Supply Voltage Max: 5.5V
• Leaded Process Compatible: No
• Supply Voltage Min: 4.5V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1199-5

3.7.1
3.7.2
3.7.3
3.7.4
3.7.5
DS295F1
3.7.6 TGAIN - TRANSMIT ANALOG GAIN
AERLE - AEC ERLE THRESHOLD
AFNSE - AEC FULL-DUPLEX NOISE THRESHOLD
NERLE - NEC ERLE THRESHOLD
NFNSE - NEC FULL-DUPLEX NOISE THRESHOLD
RGAIN - RECEIVE ANALOG GAIN
The CS6422 will allow full-duplex operation when the ERLE provided by the AEC exceeds the value
programmed at AErle. See also AFNse. See Section 6., “Glossary” for a definition of ERLE.
AFNse works in conjunction with AErle to determine when the CS6422 should transition into full-du-
plex operation. AFNse specifies a noise level. If the current noise level at the near-end input is greater
than AFNse, then AErle is used to determine if full-duplex is allowed, that is, the AEC must provide
at least AErle of cancellation in order for the CS6422 to transition to full-duplex.
If the noise level is below AFNse, the CS6422 uses an internal estimate of asymptotic performance
to determine whether or not to transition to full-duplex. If AFNse is zero, AErle is used as the exclusive
full-duplex criterion.
The CS6422 will allow full-duplex operation only when the ERLE provided by the NEC exceeds the
threshold set by NErle. See also NFNse. See Section 6., “Glossary” for a definition of ERLE.
NFNse works in conjunction with NErle to determine when the CS6422 should transition into full-du-
plex operation. If the noise level at the far-end input is greater than NFNse, then NErle is used to de-
termine if full-duplex is allowed. If the noise level is below the level of NFNse, the CS6422 uses an
internal estimate of asymptotic performance to determine whether or not to transition to full-duplex. If
NFNse is zero, NErle is always used as the exclusive full-duplex criterion.
If NFNse is non-zero, then the CS6422 will automatically disable the NEC if a network coupling path
is not detected. Thus in systems in which the presence of a network path is not known, NFNse should
be set to a non-zero value. See also AuNECD.
RGain selects the amount of additional on-chip analog gain to be supplied to the network input of the
CS6422. The output of this amplifier stage feeds the receive path ADC, and can supply 0 dB, 6 dB,
9.5 dB, or 12 dB of gain to the signal path. The gain setting defaults to 0 dB.
Note:
TGain selects the amount of additional on-chip analog gain to be supplied to the acoustic input of the
CS6422. The output of this amplifier stage feeds the transmit path ADC, and can supply 0 dB, 6 dB,
9.5 dB, or 12 dB of gain to the signal path. The gain setting defaults to 0 dB.
Note:
Changing the analog gain will change the full-scale voltage as applied to the input pin. Make
sure that the ADC input does not clip with the gain stage on.3.
Changing the analog gain will change the full-scale voltage as applied to the input pin. Make
sure that the ADC input does not clip with the gain stage on.
CS6422
CS6422
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