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CXA2561Q View Datasheet(PDF) - Sony Semiconductor

Part Name
Description
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CXA2561Q Datasheet PDF : 20 Pages
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Description of Operation
1. Signal route
The CXA2561Q signal circuit is shown in Fig. 1.
CXA2561Q
PB IN
FWD
RVS
24dB
NR ON
MUTE OFF
NR OFF
24dB
MUTE ON
AMP1
300k
AMP2
NR
7k/12k
MUTE OFF MUTE ON
100k
VGS
VGS
PBFB PBTC
PBOUT
TAPEIN
(–30dBm)
LINEOUT
(–6dBm Dolby level)
Fig. 1. Signal route block diagram
2. Gain adjustment method
Adjust the playback equalizer amplifier gain so that –6dBm (Dolby level) is output on LINEOUT (Pins 7 and 24)
by playing back the reference tape for Dolby level adjustment.
Adjustment should be performed according to the rules of Dolby Laboratories Corporation because this IC has
the built-in Dolby NR system.
Dolby level is defined as 200nWb/m measured according to the ANSI high efficiency head method.
0
–10
–20
–30
–40
–50
–60
–70
–80
(dBm)
PBOUT
VR adjustment
–30dBm
TAPEIN
400Hz 200nWb/m: Dolby Level reference tape
PBIN (HEAD)
Fig. 2. Level diagram
–6dBm
(Dolby level)
LINEOUT
Use the following reference tapes specified
by Dolby Laboratories Corporation.
1. A-bex Laboratories, Inc.
(part no. TCC-130)
2. BASF (product code 09797 XE)
3. Kaneon Corp.
(LC Engineering part no. LCT-7001)
4. Standard Tape Laboratory
(catalogue no. 28)
5. TEAC Corporation, Japan
(part no. MTT150)
6. TEAC Corporation of America
(part no. MTT150)
7. Victor Company of Japan, Ltd.
(part no. TMT-6130, VTT-727)
8. Sony Corporation (part no. TY-256)
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