CS6403 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS6403' PDF : 54 Pages View PDF
CDB6403
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
SFRAME
SMASTER
SCLK_RATE1
SCLK_RATE0
CONFIG
UALAW
GPIN3
CLK_SEL
ON
Definition
Pulse-type
SYNC
SCLK is an
input
see note
see note
Mode 1
A-law
companding
26dB Mic
gain on
PLL active
OFF
Definition
Default
Frame-type
SYNC
ON
SCLK is an
output
OFF
OFF
OFF
Mode 2
ON
µ-law
companding
OFF
26dB Mic
gain off
ON
PLL
bypassed ON
(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
ON
ON
OFF
OFF
SCLK_RATE0
ON
OFF
ON
OFF
SCLK
Frequency
256kHz
Invalid
1.024MHz
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.
44
DS192DB3
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