CDB6422 Cirrus Logic Inc, CDB6422 Datasheet - Page 5

• Manufacturer Part Number: CDB6422
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

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