CP3SP33SMSSLASHNOPB datasheet(137/407 Pages) TI1

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CP3SP33

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SNOSCW5 – MAY 2013

GAIN

MAX. INPUT

RECOMMENDED INPUT

MICGAIN FIELD

(db)

(mVpp)

500

354

1.8

406

287

4.1

312

220

251

177

100

7.8

204

144

101

10.1

156

111

110

126

88.8

111

14.5

94.2

66.6

1000

16.1

78.3

55.4

1001

18.1

62.2

1010

20.6

46.7

1011

22.1

39.3

27.8

1100

24.1

31.2

1101

26.6

23.4

16.5

1110

28.2

19.5

13.8

1111

30.1

15.6

11.1

MICMODE The Microphone Mode field configures the analog microphone input.

0 – Differential (TCMICnP and TCMICnN inputs).

1 – Single-ended (TCMICnP input only).

MICSEL

The Microphone Select bit selects between the analog and digital microphone inputs. When

a digital microphone is selected, the TCIO1 pin is configured as an output clock at 125×

oversampling rate, without regard to the GPIO registers. The digital microphone is a four-pin

device which will take the ADC clock and produce a sigma-delta stream suitable for the

decimator.

0 – Analog input.

1 – Digital input.

MUTE

The Mute bit enables muting the microphone input. For ADC1, muting is applied to both

analog and digital inputs. For ADC2, only the analog input is muted.

0 – Muting disabled.

1 – Muting enabled.

HPF

The High Pass Filter field controls the high-pass filter applied to the output of the ADC,

typically used for eliminating wind/road/pop noise. The HPF has two options, to enable the

ADC to be used at 8 kHz and 16 kHz sample rates without altering the HPF response.

HPF FIELD

DESCRIPTION

8 kHz

16 kHz

Bypass

–0.5dB Point at 300 Hz

–0.5dB Point at 600 Hz

Notch at 55 Hz (recommended)

Notch at 110 Hz

–0.5dB Point at 150 Hz

–0.5dB Point at 300 Hz

Notch at 27 Hz

Notch at 55 Hz (recommended)

Reserved

From 16 kHz to 24 kHz the HPF roll-off options will be too high frequency for most applications, so

it is recommended that the filter is bypassed above 16 kHz. Simple voice applications rarely

require sample rates above 16 kHz. It is recommended that for higher quality applications in which

24 kHz recording is required, a signal conditioning algorithm to remove unwanted LF should be

used.

Telematics Codec

137

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