Sony CXA2566M Datasheet
Headphone Stereos
Description
This is a bipolar IC designed for headphone stereos.
It provides functions such as automatic volume limiter
control, bass boost, standby, headphone driver and
others.
Features
• Low quiescent current (3.2mA at 2.4V Vcc )
• Thermal shutdown circuitry at 120°C
• Headphone driver (30mW at 2.4V Vcc for 16Ω load)
• Bass boost function (9dB)
• Standby function
• Wide operating voltage (1.8 to 5V)
• Automatic volume limiter control (100mVrms)
• Uses SOP 16 pin package
Application
Headphone Stereos
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage VCC 7V
•Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation PD 500 mW
Operating Conditions
Supply voltage VCC 1.8 to 5 V
– 1 –
E98830A91-PS
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.
CXA2566M
16 pin SOP (Plastic)
– 2 –
CXA2566M
Block Diagram and Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND
Standby
Pwr_1
PV
CC
PGND
Pwr_2
Det
AVLS
V
CC
Bass
Left
C
Right
Vref
RF_In
RF_Out
Standby Bass sw
Vref
Ripple
Bass
Boost
Detector
– 3 –
CXA2566M
Pin Description
Standby switch
H: Operate
L: Standby
Pin
No.
Symbol
Equivalent circuit
Description
1
5
GND
PGND
Pre-amp ground
Power amp ground
2
Standby
Pin
Voltage
0
0
4
16
PVCC
VCC
Power amp supply
Pre-amp supply
0
0
1
2
VCC
GND
100k
2k2k20k 124
Left channel output
Right channel output
3
6
Pwr_1
Pwr_2
1.2
1.2
3
6
VCC
GND
3k
v
v
Detector output
7
Det
< 1
VCC
GND
80k
10k
vvv
10k
124
7
VCC
GND
100k
20k 124
8
AVLS switch
H: AVLS on
L: AVLS off
8
AVLS 0
– 4 –
CXA2566M
Right channel input
Left channel input
12
14
Right
Left
1.2
vv
12
14
VCC
GND
25k
10k 10k
124
Low pass filter output
13
C
1.2
v
v
VCC
GND
32k
124
32k
13
Pin
No.
Symbol
Equivalent circuit
Description
Pin
Voltage
Ripple filter output
9
10
RF_Out
RF_In
2.2
2.2
v vv
VCC
GND
368k
32k
124
10
9
100k
124
Voltage reference output
11
Vref
1.2
vvv
11
VCC
GND
10k 10k
124
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