![](/html/4d/4d1d/4d1d2f4f2aa2cc056d83ce4160546f10192b1a91d1579debb72729e70f54dbb1/bg1.png)
Dolby∗B-C Type Noise Reduction System for Playback
Description
The CXA2502M is a bipolar IC incorporating stereo
Dolby B-C type noise reduction (NR) system for
playback.
Pins of this IC are compatible with those of the
Dolby B type NR ICs CXA1102M/ CXA1552M.
A reduction in the number of external parts and
small package have been achieved due to the fact
that the spectral skewing circuits are all on-chip and
this IC is intended for playback.
Features
• Few external parts
• Spectral skewing circuit are on-chip
• NR OFF/B/C and AUX/TAPE switches
• Small package (16-pin SOP)
• Low current consumption 12mA Typ.
• Built-in two channels
CXA2502M
16 pin SOP (Plastic)
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage VCC 17 V
• Operating temperature Topr –40 to +85 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 600 (SOP) mW
∗
This IC is available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications
information may be obtained.
∗
“Dolby” and the double D symbols are trademarks of Dolby Laboratories Licensing Corporation.
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
– 1 –
E95621A5X-PS
![](/html/4d/4d1d/4d1d2f4f2aa2cc056d83ce4160546f10192b1a91d1579debb72729e70f54dbb1/bg2.png)
CXA2502M
(–6dBm)
LINEOUT1
P13
1µ
C13
C15
C14
TAPE AUXC12
68n
100n
9
TCL1
TCH1
10
LINEOUT1
11
MODE
12
LDET
HDET
LLS
HLS
CC
V
P1
SSK
Mode
Control
SSK
LLS
HLS
LDET
HDET
(–6dBm)
LINEOUT2
P23
8
TCL2
68n
C25
7
TCH2
C24
100n
6
5
LINEOUT2
NRSW
OFF
B
C
C23
1µ
P12
PBIN1
AUXIN1
(–30dBm)
R1
20k
1µ
1µ
C11
P11
(–30dBm)
IREF
13
PBIN1
1415
GND
AUXIN1
16
MOA
IREF
MOA
4
VCT
C1
47µ
3
PBIN2
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
1µ
C22
2
V
CC
C2
10µ
1
AUXIN2
1µ
C21
P21
PBIN2
AUXIN2
(–30dBm)
P22
(–30dBm)
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
Block Diagram, Pin Configuration and Application Circuit
– 2 –
![](/html/4d/4d1d/4d1d2f4f2aa2cc056d83ce4160546f10192b1a91d1579debb72729e70f54dbb1/bg3.png)
Pin Description
Pin
No.
1
16
2
3
14
Symbol Z (in) VDC (V) Equivalent circuit Description
AUX IN
VCC
PB IN
40K
40K
VCT
VCC
VCT
40k
40k
CXA2502M
VCC
VCT
Auxiliary input.
Reference level
= –30dBm
GND
Positive power supply.
VCC
VCT
Playback input.
Reference level
= –30dBm
4
5
6
11
VCT
NRSW
LINE OUT
—
GND
Dual power supply:
0
VCT
Ground
Single power supply:
Vcc/2
VCC
50µA
22k
—
NR control
High: C type
Medium:B type
Low: NR OFF
GND
VCC
200
0
VCT
200
Line output.
– 3 –
GND
![](/html/4d/4d1d/4d1d2f4f2aa2cc056d83ce4160546f10192b1a91d1579debb72729e70f54dbb1/bg4.png)
CXA2502M
Pin
No.
7
10
8
9
Symbol Z (in) VDC (V) Equivalent circuit Description
VCC
TCH
TCL
—
—
0.4V
0.4V
36k13k
330k
GND
VCC
13.5k
480k
GND
Time constant for the
HLS.
Time constant for the
LLS.
12
13
MODE
IREF
—
VCC
50µA
22k
—
MODE control
High: TAPE
Low: AUX
GND
VCC
Reference current
0
1.25V
1.25V
which determines the
built-in filter cut-off
frequency.
GND
15
GND
GND
Dual power supply:
Negative power supply
Single power supply:
Ground
– 4 –