Datasheet CXA2566M Datasheet (Sony)

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

– 5 –

CXA2566M

Pin

No.

Symbol

Equivalent circuit

Description

Pin
Voltage

Bass switch

H: Bass on
L: Bass off

15

Bass

1

VCC

GND

20k

100k

100k

124

20k

15

– 6 –

CXA2566M

Electrical Characteristics

Items

Current
consumption 1

Current
consumption 2

Voltage gain 1
Voltage gain 2
AVLS output 1
AVLS output 2
Maximum Power
Distortion factor
Noise output
Ripple Rejection
Channel

Separation
Standby off
Standby switch
Bass on
Bass switch
AVLS on
AVLS switch

Symbols

Sw Condition

Sw1

Off

Off
Off

Off
On
On
Off
Off
Off
Off

Off
Off

Off
Off
Off
On
On

ICC1

ICC2
AV1

AV2
VAVLS1
VAVLS2
PO1
THD
Vno
RR

CS
Vstandby

Istandby
VBass
IBass
Vavls
Iavls

Sw2

On

Off
Off

Off
Off
Off
Off
Off
Off
Off

Off
Off

Off
Off
Off
Off
Off

Sw3

Off

Off
Off

On
Off
Off
Off
Off
Off
Off

Off
Off

Off
On
On
Off
Off

Sw4

Off

Off
On

On
On
On
On
On
Off
Off

On/

off
Off
Off
Off
Off
Off
Off

Sw5

Off

Off
On

On
On
On
On
On
Off
Off

Off/

on
Off
Off
Off
Off
Off
Off

Vin

–20dBm

50mVp-p

250mVp-p

Vrr

–20dBm

Measurement conditions

BB on, ∆Av at 100Hz and 1kHz

THD = 10%
VO = 0.3Vrms
Rg = 0, A-weight

VO = –10dBv

Vstandby = 1V

VBass = 1V

Vavls = 1V

– 7 –

CXA2566M

(Unless otherwise specified. Ta = 25°C, VC = 2.4V, RL = 16Ω, f = 1kHz, standby off, AVLS off, BB off)

Items

Current
consumption 1

Current
consumption 2

Voltage gain 1
Voltage gain 2
AVLS output 1
AVLS output 2
Maximum Power
Distortion factor
Noise output
Ripple Rejection
Channel

Separation
Standby off
Standby switch
Bass on
Bass switch
AVLS on
AVLS switch

No.

1

2
3

4
5
6
7
8
9

10
11
12

13
14
15
16
17

Symbols

ICC1

ICC2
AV1

AV2
VAVLS1
VAVLS2
PO1
THD
Vno
RR

∗1

CS

∗1

Vstandby
Istandby
VBass
IBass
Vavls
Iavls

Min.

—

—
11

8
86
86
15
—
—
36

–46

Typ.

18

3.2

11.78

9.22
103
104

30

0.13
–84

61

–50

1

15

1

30

1

15

Measurement conditions

Standby on

Vin = –20dBm
BB on, ∆Av at 100Hz and 1kHz
AVLS on, Vin = 50mVp-p
AVLS on, Vin = 250mVp-p
VCC = 2.4V, THD = 10%
VO = 0.3Vrms
Rg = 0
fR = 1kMz, VRR = –20dBm

VO = –10dBv

Vstandby = 1V

VBass = 1V

Vavls = 1V

Max.

23

5

12

10
116
116

—

0.3

–80

—

—

Units

µA

mA

dB

dB
mVrms
mVrms

mW

%

dBm

dB

dB

V

µA

V

µA

V

µA

∗1

Values are measured with respect to input source.

– 8 –

CXA2566M

Electrical Characteristics Measurement Circuit

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

GND

Standby

Pwr1

PV

CC

PGND

Pwr2

AVLS

Det

V

CC

Bass

Left

C

Right

Vref

RF_In

C5 10µ

C6 10µ

C7 1µ

C9 1µ

V3

OFF

ON

C8 0.1µ

C4 1µ

RF_Out

C1 10µ

S3

OFF

V1

ON

OFF

VCC Vrr

S1

V2

OFF

ON

S2

ON

S5

Vin

ON

OFF

S4

C2 220µR1 16

C3 220 µR2 16

– 9 –

CXA2566M

Description of Operation

1) Det Pin (Pin 7)
This is the external pin for the detector during AVLS mode. The attack time is determined by the internal
charging buffer and the external capacitor. The recovery time is determined by both the 80k impedance inside
the IC and the external capacitor.

2) RF_Out (Pin 9) / RF_In (Pin 10)
These are the two external pin for the power supply's ripple filter. It provides a regulated 0.92 × Vcc to the
internal circuits. The rejection ratio is determined by the resistors inside the IC and the two external capacitors.

VCC

Regulated

V

CC

RF_OutRF_In

32k

100k

368k

10 9

3) C Pin (Pin 13)

Out
Left

Out

Right

32k

32k

Left

Right

32k

32k

65k

21k

32k

C

32k

32k

32k

32k

32k

13

The bass boost circuitry is designed to provide a 9dB
gain at 100Hz for C = 0.1µF.
The cut off frequency is determined by:

fcutoff =

1

2π × 16k × C

– 10 –

CXA2566M

Application Circuit

2

GND

Standby

Pwr_1

PV

CC

PGND

Pwr_2

AVLS

Det

V

CC

Bass

1: Bass On
0: Bass Off

1: AVLS On
0: AVLS Off

1: Standby Off
0: Standby On

Left

C

Right

Vref

RF_In

RF_Out

Standby Bass sw

1µ

0.1µ

1µ

10µ

10µ

1µ

Vref

Ripple

Bass

Boost

Detector

10µ

220µ

16

16

220µ

14

15

9

10

11

12

13

2.4V

220µ

3

4

5

6

7

8

16

1

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for
any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

– 11 –

CXA2566M

Example of Representative Characteristics

Circuit current (at no signal)

VCC [V]

ICC [mA]

3.0 3.5 4.0 4.51.5

2.5

3.0

3.2

2.9

3.1

2.7

2.6

2.8

3.6

3.7

3.4

3.3

3.5

3.8

3.9

4.0

2.0 2.5 5.0

Distortion factor vs. Input characteristics

Input [Vpk]

Distortion factor [%]

0.10.001

0.01

0.1

1

10

0.01 1

Crosstalk vs. Frequency

Frequency [Hz]

Crosstalk [dB]

1k 10k10

–60

–55

–53

–56

–54

–58
–59

–57

–49

–48

–51
–52

–50

–43

–42

–45

–44

–41

–46
–47

–40

100 100k

Frequency characteristic

Frequency [Hz]

Gain [dB]

1k 10k10

3.0

8.0

10.0

7.0

9.0

5.0

4.0

6.0

14.0

15.0

12.0

11.0

13.0

16.0

17.0

18.0

19.0

20.0

22.0

21.0

23.0
Bass Boost On

C = 0.1µF

100 100k

– 12 –

CXA2566M

Package Outline Unit: mm

PACKAGE STRUCTURE

PACKAGE MATERIAL
LEAD TREATMENT
LEAD MATERIAL
PACKAGE MASS

SONY CODE
EIAJ CODE
JEDEC CODE

SOP-16P-L01
SOP016-P-0300

COPPER ALLOY

SOLDER PLATING

EPOXY RESIN

16PIN SOP (PLASTIC)

9.9 – 0.1

+ 0.4

16

9

1 8

1.27

0.45 ± 0.1

5.3 – 0.1

+ 0.3

7.9 ± 0.4

6.9

1.85 – 0.15

+ 0.4

0.5 ± 0.2

0.2 – 0.05

+ 0.1

0.1 – 0.05

+ 0.2

0.2g

0.15

M

0.24