CP3SP33SMSSLASHNOPB datasheet(136/407 Pages) TI1

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CP3SP33

SNOSCW5 – MAY 2013

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CLKPH

The Clock Phase bit can be used to invert the phase of the output clock for use with

non-standard digital microphones.

0 – Normal clock.

1 – Inverted clock.

SIDETONEATTEN The Sidetone Attenuation field specifies the gain used in the sidetone feedback. This

should only be used if the DAC and ADC are operating at the same sample rates.

SIDETONEATTEN FIELD

GAIN (db)

0000

Off (Mute)

0001

–36

0010

–33

0011

–30

0100

–28

0101

–26

0110

–24

0111

–22

1000

–20

1001

–18

1010

–15

1011

–12

1100

–9

1101

–66

1110

–3

1111

STCLPL

The Sidetone Clipping Left Channel bit indicates that the sidetone applied to the left DAC

channel is too large, and the signal has clipped. More headroom should be provided in the

DAC data or the level of sidetone should be reduced. Write 1 to the bit to clear it.

0 – No clipping has occurred.

1 – Clipping has occurred.

STCLPR

The Sidetone Clipping Right Channel bit indicates that the sidetone applied to the right DAC

channel is too large, and the signal has clipped. More headroom should be provided in the

DAC data or the level of sidetone should be reduced. Write 1 to the bit to clear it.

0 – No clipping has occurred.

1 – Clipping has occurred.

20.10.5 Codec ADC Analog Control Register n (TCDCADCANAn)

The TCDCADCANAn registers are 16-bit, read/write register that configure the analog portions of the

ADCs. After reset, these registers are cleared to 0000h.

4 3

Reserved

HPF

MUTE

MICSEL

Reserved

MICMODE

Reserved

MICGAIN

The Microphone Gain field selects the gain of the microphone pre-amp. For a MICGAIN of 0

dB, the input should not exceed 500 mVpp (third harmonic distortion ~ –70 dB). For lower

distortion, reduce the maximum input signal by 3 dB, a 350 mVpp input gives a third

harmonic at ~ –80 dB. This applies to both differential and single-ended configurations.

For a differential input, the peak-to-peak voltage is the difference between the maximum

negative voltage on TCMICnN and the maximum positive voltage on TCMICnP. For a single-

ended input, the peak-to-peak voltage is the difference between the minimum and maximum

voltage on TCMICnP.

136

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