CDB6422 Cirrus Logic Inc, CDB6422 Datasheet - Page 5
CDB6422
Manufacturer Part Number
CDB6422
Description
Development Kit
Manufacturer
Cirrus Logic Inc
Datasheet
1.CDB6422.pdf
(30 pages)
Specifications of CDB6422
Silicon Manufacturer
Cirrus Logic
Application Sub Type
Telephone
Kit Application Type
Communication & Networking
Silicon Core Number
CS6422
Description/function
Audio DSPs
Operating Supply Voltage
5 V to 12 V
Product
Audio Modules
Kit Contents
Evaluation Board
Rohs Compliant
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
CS6422
+20dB". The pot labeled "AIN_GAIN" (R2) con-
trols the variable gain.
2.2.1.5
AIN5 selects the acoustic input source from the fol-
lowing options: “ACTIVE” (the previous gain
sources), “PASSIVE” (the RC-network), and “DT-
MF” (the DTMF transceiver, used for testing pur-
poses).
2.2.1.6
AIN6 and AIN7 are configured based on the state
of the internal MIC preamp on the CS6422. If the
internal mic preamp is enabled (Mic = '1'), then
AIN6 and AIN7 should be configured to the "ON"
position. If the internal mic preamp is disabled
(Mic = '0'), then AIN6 and AIN7 should be config-
ured to the "OFF" position.
2.2.2
2.2.2.1
AOUT1 selects between the “ACTIVE” drive out-
put circuitry (op-amps) and the “PASSIVE” cir-
cuitry (simple RC-network). To take advantage of
the supplied filters and gain stages, set AOUT1 to
the “ACTIVE” state.
2.2.2.2
AOUT2 selects the order of the Butterworth filter
following AO at either "1-POLE" or "3-POLES".
2.2.2.3
AOUT3 and AOUT4 select the type and amount of
gain for the acoustic output circuitry. For fixed
gains (AOUT4 = “0dB” or “USER”), AOUT3
should be set to "FIXED". For variable gain (-
20dB to +20dB) AOUT3 should be set to "VARI-
ABLE" and AOUT4 should be set to "-20dB to
+20dB". The pot labeled "AOUT_GAIN" (R3)
controls the variable gain.
DS295DB2
Acoustic Output
AIN5:
AIN6, AIN7:
AOUT1:
AOUT2:
AOUT3, AOUT4:
2.2.2.4
AOUT5 selects the source of the acoustic output
RCA jack (“0dB” before gain stage, “GAINED”
after gain stage, or “PASSIVE” RC-network).
2.2.2.5
AOUT6 selects the type of output (“AC”-coupled
or ”DC”-coupled) at the AOUT_RCA jack.
2.2.2.6
SPEAKER_GAIN selects the gain of the on-board
differential BTL speaker driver to “0dB”, “+6dB”,
“+9dB”, or “USER”. The “+9dB” setting should
not be used, as it will result in clipping at the speak-
er driver outputs.
2.2.3
2.2.3.1
NIN1 selects between the “ACTIVE” network in-
put circuitry (op-amps) and a “PASSIVE” RC-net-
work.
2.2.3.2
NIN2 and NIN3 select the type and amount of gain
for the network input circuitry. For fixed gains
(NIN3 = “0dB” or ”USER”), NIN2 should be set to
"FIXED". For variable gain (-20dB to +20dB)
NIN2 should be set to "VARIABLE" and NIN3
should be set to "-20dB to +20dB". The pot labeled
"NIN_GAIN" (R5) controls the variable gain.
2.2.3.3
NIN4 selects the network input source from the fol-
lowing options: “ACTIVE” (the previous gain
sources),
“POTS(DAA)” (the analog telephone line), “CO-
DEC” (the µ-law codec), or “DTMF” (the DTMF
transceiver, used for testing purposes).
Network Input
AOUT5:
AOUT6:
SPEAKER_GAIN:
NIN1:
NIN2, NIN3:
NIN4:
“PASSIVE”
(the
CDB6422
RC-network),
5