CS6403 datasheet(44/54 Pages) CIRRUS

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DIP Switches

The DIP switch SW7 provides access to mode

setting pins on the CS6403. The default settings

indicate how it is shipped from the factory

(Mode 1).

When a switch is in the ON position, a logic low

is applied to the corresponding pin on the

CS6403.

Conversely, the OFF position corre-

sponds to logic high.

Pin Name

Definition

OFF

Definition

Default

SFRAME

Pulse-type

SYNC

Frame-type

SYNC

SMASTER

SCLK is an

input

SCLK is an

output

OFF

SCLK_RATE1

see note

OFF

SCLK_RATE0

see note

OFF

CONFIG

Mode 1

Mode 2

UALAW

A-law

companding

µ-law

companding

OFF

GPIN3

26dB Mic

gain on

26dB Mic

gain off

CLK_SEL

PLL active

PLL

bypassed

(use CLKIN)

Note:

SCLK_RATE1 and SCLK_RATE0 determine

the frequency of SCLK the part should expect in

Mode 1. In Mode 2, both of these switches should

be OFF. Mode 1 SCLK frequency is given by the fol-

lowing table:

SCLK_RATE1

SCLK_RATE0

SCLK

Frequency

256kHz

OFF

Invalid

OFF

1.024MHz

OFF

2.048MHz

Using the CDB6403 Evaluation Board

General Setup

The CDB6403 requires only a +5V power sup-

ply capable of sourcing 200mA of current in

order to work. It is important to power both the

analog and digital sections. Separate power sup-

plies would be ideal, however, separate leads

from the same power supply is acceptable. Once

power is applied, press the RESET button to en-

sure the board is in a known state.

Definitions

We define the near-end as the end where the pri-

mary echo exists.

Signal comes out of the

near-end output and is picked up by the near-end

input. For speakerphone applications, the near-

end would be the acoustic path between the

microphone and speaker. For network echo can-

cellers, the near-end would consist of the lossy

hybrid. The near-end input of the CS6403 is the

MICIN pin and the near-end output is the

SPKROUT pins.

The near-end input is some-

times referred to as the transmit input (TXI) and

the near-end output is similarly sometimes called

the receive output (RXO).

We define the far-end as the end where either no

echo or secondary echo exists. Signal presented

to the far-end input comes out the near-end out-

put. Echo cancelled near-end input signal comes

out the far-end output. For speakerphone appli-

cations, the far-end would be the network side of

the phone. The CS6403 far-end interface is digi-

tal (via the SSI).

For Mode 1 applications, a

PCM codec is provided as an analog interface

with FE_IN as the far-end input and FE_OUT as

the far-end output. Mode 2 applications connect

directly to the SSI of the CDB6403. Receive in-

put (RXI) and transmit output (TXO) are other

names commonly used to refer to far-end input

and far-end output, respectively.

CDB6403

DS192DB3

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