CS6420-CS datasheet(31/52 Pages) CIRRUS

Part #	CS6420-CS

Description	FULL DUPLEX SPEAKERPHONE CHIP

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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31 / 52 page

CS6420

DS205PP2

31

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 Vrms (2.8 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 Vrms (2.8 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 signal without 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 1 Vrms (2.8 Vpp), assuming default settings for the Tx Analog Gain.

MB - Microphone Bias Voltage Output, Pin 19

Output of 3.5 VDC provides the internal voltage reference for the CS6420. 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.

1

2

3

4

5

6

7

8

12

13

14

15

16

AVDD

AGND

AO

NO

RST

DRDY

STROBE

DATA

DVDD

DGND

CLKI

CLKO

NC4

9

10

NC1

NC2

17

18

APO

NI

19

20

API

MB

11

NC3

CS6420

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CS6420-CS Datasheet(PDF) 31 Page - Cirrus Logic

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