CXA1100/CXA1101/CXA1102/CXA1163
4) MPX filter termination and C1 for Vcc/2 (Pin 4)
The MPX (multiplex) filter termination method shown in Fig. a-3 allows saving the coupling capacitors
between the buffer amplifiers and MPX filters. However, the channel to channel separation and REC to PB
crosstalk of low frequency signals will be degraded by the termination resistor RT. For example, 5kΩ of R1
will degrade the channel to channel separation to 50dB. Better separation can be obtained by increasing
the capacitance of C1 (Pin 4) to 220µF or 470µF.
The allowable minimum value of C1 is 47µF, and 100µF is the standard recommended value. Larger values
of C1 are generally desirable in order to improve the crosstalk and ripple rejection ratio.
5) Application for dubbing cassette decks
The CXA1100 series generates non decoded signal at the recoding output in the decode mode, and can
simplify the structure of dubbing decks. See the SONY' Dolby B/C type IC (CX20187/CXA1097Q or
CX20188/CXA1098Q) data sheet in detail.
C11
4.7µ
Line
Input
MPX
Buffer
Filter
MPX
Filter
13
16
15
14
RT
RT
CXA1100 Series
1
2
3
4
Line
Input
MPX
Buffer
Filter
MPX
Filter
C21
4.7µ
C1
470µ
Fig. a-3.
Switchable Processor with Single Supply
C3
10µ
REC/PB
REC
PB
C14
4.7µ
R2
PB IN
LINE OUT
REC OUT
10k
(–30dBm)
C12
R1
(12
%)
C13 (10%)
0.68µ
1µ
REC IN
(–30dBm)
43k
C11
1µ
C15
4.7µ
13
4
16
15
2
14
3
12
11
10
7
9
RT
RT
VCC
C25
4.7µ
1
5
6
8
REC OUT
(–10dBm)
C1
100µ
C23 (10%)
0.68µ
REC IN
(–30dBm)
C2
100µ
LINE OUT
C21
1µ
PB IN
(–30dBm)
C24
4.7µ
NR
C22
1µ
ON/OFF
OFF
ON
Note 1) Resistor and capacitor tolerances are ±10% and ±20% respectively unless otherwise specified.
Note 2) When resistors RT are connected to Pin 4 for the MPX filter termination, increase the capacitances of
C1 and C11 (C21) to 470µF and 4.7µF respectively.
– 12 –
SONY [ SONY CORPORATION ]
