CS6422-CS datasheet(42/48 Pages) CIRRUS

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CS6422

5. PIN DESCRIPTIONS

Analog Interface

AO - Acoustic Interface Output, Pin 3

Analog voltage output for the acoustic side (near-end output/receive output). Maximum output signal is

1.1 Vrms (3.1 Vpp). This output can drive down to 10 kΩ and is usually followed by a speaker driver. The

output is pre-compensated to expect a single-pole RC low pass filter with a corner frequency of 4 kHz.

NO - Network Interface Output, Pin 4

Analog voltage output for the network side (far-end output/transmit output). Maximum output signal is

1.1 Vrms (3.1 Vpp). This output can drive down to 10 kΩ. The output is pre-compensated to expect a

single-pole RC low pass filter with a corner frequency of 4 kHz.

API - Acoustic Interface Preamplifier Input, Pin 20

Input to the acoustic side microphone preamplifier. Signal source resistance at this pin will reduce the

34 dB gain inherent in the preamplifier. The maximum input signal level to avoid clipping is 20 mVrms

(57 mVpp), assuming default settings.

APO - Acoustic Interface Preamplifier Output, Pin 18

Output of the acoustic side microphone preamplifier and input to the acoustic side analog-to-digital

converter (near-end input/transmit input). This input expects a single-pole RC anti-aliasing filter with a

corner frequency of 8 kHz. Maximum signal level before clipping at this point is 0.9 Vrms (2.5 Vpp),

assuming default settings for TGain.

MB - Microphone Bias Voltage Output, Pin 19

Output of 3.5 VDC provides the internal voltage reference for the CS6422. MB must be decoupled with

a 10

µF and 0.1 µF capacitor to prevent noise from affecting the on-chip voltage reference. MB must

not be connected to any load.

AVDD

AGND

RST

DRDY

STROBE

DATA

DVDD

DGND

CLKI

CLKO

NC4

NC1

NC2

APO

API

NC3

CS6422

DS295F1

CS6422-CS Datasheet(PDF) 42 Page - Cirrus Logic

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