Datasheet CXA2561Q Datasheet (Sony)

Dolby∗B-C Type Noise Reduction System with Playback Equalizer Amplifier

Description

The CXA2561Q is an IC designed for use in car
stereo cassette decks. Functions include Dolby B-C
type noise reduction (NR) system, playback equalizer
amplifier and music sensor into a single chip.

Features

• Few external parts

• Small package (40-pin QFP)

• Same pin configuration as for the Dolby B type NR

system (CXA2560Q) and no Dolby NR system

(CXA2559Q)

• Dolby B-C type NR and playback equalizer

amplifier into a single chip

• FORWARD/REVERSE head select switch

• Mute function

• Music signal interval detection level can be set by

the external resistors/capacitors (2 modes).

• High-frequency cut-off of the music sensor circuit

can be adjusted by the external capacitance.

CXA2561Q

40 pin QFP (Plastic)

Structure

Bipolar silicon monolithic IC

Absolute Maximum Ratings

• Supply voltage VCC 12 V

• Operating temperature Topr –40 to +85 °C

• Storage temperature Tstg –65 to +150 °C

• Power dissipation PD 430 mW

Operating Condition

Supply voltage VCC 7.8 to 11 V

Applications

• Car stereo cassette decks

• Playback-only cassette decks

∗

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 –

E97439A79-PS

Block Diagram and Pin Configuration

CXA2561Q

PBFB2

PBRIN2

PBGND

PBFIN2

VCT

PBREF

PBFIN1

PBGND

PBRIN1

PBFB1

31

32

33

34

35

36

37

38

39

40

45k

PBTC2

30

1

7k/12k

300k

F2

30k

30k

300k

7k/12k

PBOUT2

29

F1

2

OUTREF2

28

70µ/120µ

70µ/120µ

3

TAPEIN2

27

100k

×1

×1

100k

4

T2

26

T1

5

GND

LPF

DIREF

25

24

BIAS

MUTE

TAPE EQ

FWD/RVS

VCC

F3

6

LINEOUT2

23

OFF/

B/C

OFF/

B/C

8

7

TCH2

NR

NR

TCL2

21

22

MS MODE

NR MODE

MS ON/

OFF

DET

9

10

MSSW

20

19

18

17

16

15

14

13

12

11

MSMODE

DRSW

TAPESW

MUTESW

NRSW

NRMODE

MSOUT

MSTC

G1FB

G2FB

PBTC1

PBOUT1

TAPEIN1

OUTREF1

Vcc

NC

TCH1

LINEOUT1

TCL1

MSLPF

– 2 –

CXA2561Q

Pin Description (Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)

Pin
No.

1

30

Symbol

PBTC1
PBTC2

229PBOUT1

PBOUT2

Typical pin voltage

DC AC

4.0V —

4.0V –25dBm

I/O

resis­tance

——

I/O

O

—

Equivalent circuit Description

Vcc

Playback equalizer
amplifier
capacitance.

Vcc

Playback equalizer
amplifier output.

30

29

147

1

GND

40

31

147

2p

200

200

300k

2

3

28

4

27

OUTREF1
OUTREF2

TAPEIN1
TAPEIN2

4.0V —

4.0V

–30dBm

GND

Vcc

200

O

I 100kΩ TAPE input.

—

27

28

4

3

200

GND

Vcc

147

100k

30p

Output reference.
(Vcc/2 output)

VGS

GND

Vcc 8.0V5 — — — Power supply.

– 3 –

CXA2561Q

(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)

Pin
No.

Symbol

724LINEOUT1

LINEOUT2

823TCH1

TCH2

Typical pin voltage

DC AC

4.0V –6dBm

0.3V —

I/O

resis-

Equivalent circuit Description

tance

Vcc

200

I/O

O — Line output.

24

——

8

23

147

7

147

200

36k

22.5k

GND

Vcc

Time constant for
the HLS.

330k

922TCL1

TCL2

10 MSLPF — 100k

0.3V —

4.0V —

——

22

GND

Vcc

13.5k

147

9

480k

GND

Vcc

100k

147

10

64p

Time constant for
the LLS.

Cut-off frequency
adjustment of the
music sensor LPF.

– 4 –

GND

CXA2561Q

(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)

Pin
No.

Symbol

1112G2FB

G1FB

13

MSTC

Typical pin voltage

DC AC

4.0V —

—

—

I/O

resis­tance

——

I/O

—

—

Equivalent circuit Description

Vcc

147

11

12

853

147

13

500

500

GND

Vcc

Music signal interval
detection level
setting.

Time constant for
detecting the music
signal interval.

10k

GND

14 MSOUT

NRMODE

15

17 MUTESW

18

TAPESW

0.2V
when a
signal is
detected;
DVcc
when no
signal is
detected.

0.0V
when
open.

—

—

O—

I 100kΩ

15
17
18

21

14

147

100k

Vcc

GND

GND

Music sensor
output.

Dolby NR mode
control.
Low (open):

High: Dolby C NR

Vcc

Mute function
control.
Low (open):

High: Mute ON
Playback equalizer

amplifier control.
Low (open): 70µs
High: 120µs

Dolby B NR

Mute OFF

21

MSSW

Music sensor
control.
Low (open): MS ON
High: MS OFF

– 5 –

CXA2561Q

(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)

Pin

No.

Symbol

Typical pin voltage

DC AC

16 NRSW

0.0V
when

—

open.

19 DRSW

0.0V

20 MSMODE I

when

—

open.

I/O

resis­tance

I 100kΩ

100kΩ

I/O

Equivalent circuit Description

Vcc

Dolby NR control.
Low (open):

High: NR ON

147

16

19

100k

Head select control.
Low (open):

GND

High: REVERSE

Vcc

Music sensor mode

147

20

100k

control.
Low (open): G1
High: G2

NR OFF

FORWARD

25 DIREF — —

26

GND

31

PBFB2

40

PBFB1

1.2V —

0.0V

4.0V

—

–70dBm

—

—

I—

3239PBRIN2

PBRIN1

—

34
37

PBFIN2
PBFIN1

4.0V

–70dBm

I

147

25

32

150 150

39

34

37

50p50p

GND

Vcc

GND

Vcc

GND

Resistance for
setting the reference
current.
(Connects 20kΩ
between DIREF pin
and GND for the
standerd setting.)

Ground.

Playback equializer
amplifier feedback.

Playback equializer
amplifier input.

31

(REVERSE head

40

connected)

Playback equializer
amplifier input.
(FORWARD head
connected)

– 6 –

CXA2561Q

(Ta = 25°C, VCC = 8.0V, DVCC = 5.0V)

Pin
No.

33
38

Symbol

PBGND

35 VCT O —

Typical pin voltage

DC AC

0.0V —

4.0V —

I/O

——

I/O
resis­tance

Equivalent circuit Description

Playback equializer
amplifier ground.
(Connect to ground.)

Vcc

30k

147

35

45k

30k

×1

VGS

Center.
(Vcc/2 output)

GND

Vcc

36 PBREF O —

NC

6

4.0V —

————

36

200

200

Playback equializer
amplifier reference.
(Vcc/2 output)

GND

No connected.

– 7 –

CXA2561Q

Electrical Characteristics (Ta = 25°C, VCC = 8.0V. DVCC = 5.0V)

Item

Operating voltage
Current consumption

Symbol
Vopr

ICC

No signal, NR OFF, MUTE OFF, 70µs,
MS ON

Measurement conditions

Dolby NR (0dB = Dolby level LINEOUT of –6dBm)
TAPEIN input sensitivity
B type decode boost

characteristics 1
B type decode boost

characteristics 2
B type decode boost

characteristics 3
B type decode boost

characteristics 4
B type decode boost

characteristics 5
C type decode boost

characteristics 1
C type decode boost

characteristics 2

VTIN
BP1

BP2

BP3

BP4

BP5

CP1

CP2

TAPEIN 1kHz, LINEOUT 0dB, NR OFF
TAPEIN 500Hz, LINEOUT –25dB, NR B

TAPEIN 2kHz, LINEOUT –25dB, NR B

TAPEIN 5kHz, LINEOUT –25dB, NR B

TAPEIN 10kHz, LINEOUT –40dB, NR B

TAPEIN 10kHz, LINEOUT 0dB, NR B

TAPEIN 500Hz, LINEOUT –60dB, NR C

TAPEIN 500Hz, LINEOUT –25dB, NR C

Min. Typ.

7.8

13.0

–32.0

1.4

5.5

3.9

9.7

–1.1

14.2

7.2

8.0

19.2

–30.0

2.9

7.0

5.4

10.4

0.4

16.2

9.2

Max.

11.0

25.0

–28.0

4.4

8.5

6.9

11.9

1.9

18.2

11.2

Unit

V

mA

dBm

dB

dB

dB

dB

dB

dB

dB

C type decode boost
characteristics 3

C type decode boost
characteristics 4

C type decode boost
characteristics 5

C type decode boost
characteristics 6

Total harmonic
distortion 1

Total harmonic
distortion 2

Total harmonic
distortion 3

Decode S/N ratio 1

Decode S/N ratio 2

Signal handling

CP3

CP4

CP5

CP6

THD1

THD2

THD3

SN1

SN2

SH1

TAPEIN 2kHz, LINEOUT –60dB, NR C

TAPEIN 2kHz, LINEOUT –25dB, NR C

TAPEIN 5kHz, LINEOUT –25dB, NR C

TAPEIN 10kHz, LINEOUT 0dB, NR C
TAPEIN 1kHz –20dBm, NR OFF,

RL = 2.7kΩ
TAPEIN 1kHz –20dBm, NR B,

RL = 2.7kΩ
TAPEIN 1kHz –20dBm, NR C,

RL = 2.7kΩ
No signal, NR B, Rg = 5.1kΩ,

CCIR/ARM filter used
No signal, NR C, Rg = 5.1kΩ,

CCIR/ARM filter used
TAPEIN 1kHz, NR OFF, RL = 2.7kΩ,

THD = 1%

18.7

5.4

3.5

–5.5

—

—

—

77.0

80.0

13.0

20.7

7.4

5.5

–3.5

0.01

0.04

0.05

87.0

82.0

14.4

22.7

9.4

7.5

–1.5

0.2

0.2

0.3

—

—

—

dB

dB

dB

dB

%

%

%

dB

dB

dB

Crosstalk between
channels 1

CT1

TAPEIN 1kHz –24dBm, NR OFF,
1kHz BPF used

– 8 –

—

–96.0

–70.0

dB

CXA2561Q

Item
Mute characteristic
Output DC offset voltage

Playback Equalizer Amplifier

Playback equalizer amplifier
reference output level

Playback equalizer amplifier
frequency response 1

Playback equalizer amplifier
frequency response 2

Signal handling

Total harmonic distortion

S/N ratio

Output DC offset voltage

Symbol
MUTE
VOS1

PBREF

F120

F70

SH2

THD4

SN3

VOS2

Measurement conditions

TAPE IN 1kHz –24dBm,
MUTE ON 1kHz BPF used, NR OFF

No signal, NR OFF, difference from VCT

PBIN 315Hz –70dBm, 120µs mode
PBIN 2.7kHz –58.5dBm,

120µs mode at 315Hz
PBIN 4.5kHz –53.8dBm,

70µs mode at 315Hz
PBIN 1kHz, 120µs mode, RL = 2.7kΩ,

THD = 1%
PBIN 1kHz –52dBm, 120µs mode,

RL = 2.7kΩ
No signal, 70µs mode, Rg = 680Ω,

CCIR/ARM filter used
No signal, 120µs mode, Rg = 680Ω,

difference from VCT

Min. Typ.

–110.0

—

–0.1

–27.0

–1.5

–1.5

–10.0

—

57.0

–1.0

0.0

–25.0

0.0

0.0

–3.0

0.07

63.5

0.0

Max.

–70.0

0.1

–23.0

1.5

1.5

—

0.5

—

1.0

Unit

dB

V

dBm

dB

dB

dBm

%

dB

V

Crosstalk between
channels

Crosstalk between
FORWARD and REVERSE

Music Sensor

Signal detection level 1

Signal detection level 2
MS output leak current

MS output saturation
voltage

Logic Voltage

Low level

High level

CT4

CT5

VMS1

VMS2
IOH
VOL

VIL

VIH

PBIN 1kHz –52dBm, 120µs mode,
1kHz BPF used

PBIN 1kHz –52dBm, 120µs mode,
1kHz BPF used

TAPEIN 5kHz, MS ON, G1 mode,
external constant of 39kΩ and 0.0047µF

TAPEIN 5kHz, MS ON, G2 mode,
external constant of 3.9kΩ and 0.47µF

No signal, MS OFF, G1 mode
TAPEIN 5kHz –30dBm, MS ON,

G1 mode, 1mA applied to MSOUT pin

Input voltage of NRMODE, NRSW,
MUTESW, TAPESW, DRSW, MSMODE,
MSSW

Input voltage of NRMODE, NRSW,
MUTESW, TAPESW, DRSW, MSMODE,
MSSW

—

—

–43.0

–63.0

—
—

0.0

2.5

–75.0

–80.0

–40.0

–60.0

0.0

0.3

—

—

–70.0

–70.0

–37.0

–57.0

1.0

1.0

0.8

VCC

dB

dB

dBm

dBm

µA

V

V

V

– 9 –

Electrical Characteristics Measurement Circuit

CXA2561Q

Audio

SG

Power

Supply

VCC

GND

DC Ammeter

DV

C23

4.7n

0.47µ

C22

S21
S20
S19
S18
S17

∗

CC

R22

S16

10k

R17
1MEG

S15
S14
S13
S12

±5%
±1%

∗ :

±5%

∗ :

±2%
±10%

R28
50k

GND GND

DC

Voltmeter

0dB or 30dB

Amp

OFF: 0dB
ON: 30dB

S22

"A" WTG

DIN Audio

1kHz BPF

+20dB

CCIR/ARM

+20dB

AC

Voltmeter

Distortion

Analyzer

Oscilloscope

S27

S26

S25

S24

S23

R27 10k
R26 100
R25 10k
R24 100

R23 10k

∗

C9

2.2µ

S8

R8

2.7k

C7

0.01µ

∗

C5

R2

2.2µ

S4

S3

S2

S1

A

270

∗

680

∗

C4

2.2µ

C3

22µ

C2

2.2µ

∗

680

∗

C1

2.2µR3680

∗

R1

270

C6

0.01µ

R6

680

R4

R5

31

32

33

34

35

36

37

38

39

40

PBFB2

PBRIN2

PBGND

PBFIN2

VCT

PBREF

PBFIN1

PBGND

PBRIN1

PBFB1

30

PBTC2

PBTC1

1

29

PBOUT2

PBOUT1

2

∗

2.7k

R7

C8

2.2µ

S6

28

OUTREF2

OUTREF1

3

S5

C11

1µ

S7

R10 5.1k

∗

C12

1µ

TAPEIN2

TAPEIN1

4

C10
22µ

R9 5.1k

∗

2627

GND

CXA2561Q

CC

V

5

R11 20k

∗

25

DIREF

NC

6

C16

2.2µ

C17

2.2µ

24

R12 2.7k

S9

S10

R13 2.7k

∗

LINEOUT2

LINEOUT1

7

23

8

C19

0.1µ

TCH2

TCH1

C18

0.1µ

22

9

0.068µ

TCL2

TCL1

C20

0.068
µ

C21

21

MSSW

MSMODE

TAPESW

MUTESW

NRMODE

MSOUT

MSLPF

10

S11

DRSW

NRSW

MSTC

G1FB

G2FB

C15

270p

MSSW

H/L

MSMODE

H/L

20

DRSW

H/L

19

TAPESW

H/L

18

MUTESW

H/L

17

NRSW

H/L

16

NRMODE

H/L

15

R16

100k

14

C24

13

0.1µ

12

∗

R15
39k

11

∗

R14

3.9k

R21 10k
R20 100

R19 10k
R18 100

Notes1. Resistor tolerance
 2. Capacitor tolerance


 Coupling Capacitor

– 10 –

Application Circuit

C7

0.01µ

R8
10k

C9

0.1µ

GNDGND

20k

LINEOUT2

C12

R9

0.47µ

GND GND

C14

0.1µ

C16

0.068µ

CXA2561Q

RVS2

FWD2

FWD1

RVS1

C4

470p

C3

470p

C2

470p

C1

470p

R6

180

R4

100k

R3

100k

R2

100k

R1

100k

R5

180

GND

GND

GND

PBFB2

PBRIN2

PBGND

PBFIN2

C5

22µ

PBREF

PBFIN1

PBGND

PBRIN1

PBFB1

VCT

31

32

33

34

35

36

37

38

39

40

C6

0.01µ

45k

PBTC2
30

300k

30k

30k

7k/12k

1

PBTC1

R7
10k

PBOUT2

29

7k/12k

F2

F1

300k

2

PBOUT1

OUTREF2

TAPEIN2
27

28

70µ/120µ

×1

×1

70µ/120µ

4

3

TAPEIN1

OUTREF1

C8

0.1µ

100k

100k

GND

T2

T1

GND
26

5

Vcc

Vcc
C10

22µ

LPF

DIREF
25

BIAS

MUTE

TAPE EQ

FWD/RVS

VCC

6

NC

C11

0.47µ

LINEOUT1

LINEOUT2

TCH2
23

24

OFF/

B/C

F3

OFF/

B/C

8

7

TCH1

LINEOUT1

C15

C13

0.068

0.1µ

µ

GND GND GND

TCL2
22

NR

MS MODE

NR MODE

DET

NR

9

TCL1

C17

120p

MSSW
21

MS ON/

OFF

10

MSLPF

20

19

18

17

16

15

14

13

12

11

R10

3.9k

C19

0.47µ

MSMODE

DRSW

TAPESW

MUTESW

NRSW

NRMODE

MSOUT

MSTC

G1FB

G2FB

R11
39k

C20

4.7n

GND

GND

From
Microcomputer

To Microcomputer

R13

100k

C18

0.1µ
R12

1MEG

DV

CC

GND

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 –

Description of Operation

1. Signal route

The CXA2561Q signal circuit is shown in Fig. 1.

CXA2561Q

24dB

NR OFF

100k

TAPEIN
(–30dBm)

MUTE ON

AMP2

MUTE ONMUTE OFF

VGS
VGS

24dB

NR

LINEOUT
(–6dBm Dolby level)

PB IN

FWD

RVS

PBFB

AMP1

PBTC

NR ON

MUTE OFF

300k

7k/12k

PBOUT

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

400Hz 200nWb/m: Dolby Level reference tape

PBIN (HEAD)

–30dBm

TAPEIN

Fig. 2. Level diagram

–6dBm
(Dolby level)

LINEOUT

– 12 –

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)

3. Playback equalizer amplifier

PB IN

CXA2561Q

FWD

PBTC

C1

0.01µ

AMP1

300k

Ri

OUTREF

to TAPEIN

RVS

PBFB PBOUT

PBREF

R1

Fig. 3. Playback equalizer amplifier block diagram

The CXA2561Q configures the playback equalizer amplifier by connecting the external capacitor C1 and
resister R1 shown in Fig. 3.
Two systems (FORWARD and REVERSE) of playback head input are provided for each channel.
The FORWARD input pin is selected when DRSW (Pin 19) is Low; REVERSE is selected when DRSW is
High.
The playback equalizer amplifier frequency response can be set in two levels (70µs/ 120µs).
When TAPESW (Pin 18) is Low, Ri is 7kΩ; when TAPESW is High, Ri is 12kΩ.
The gain can be adjusted by connecting VR between PBOUT (Pins 2 and 29) and OUTREF (Pins 3 and 28); or
by using VR for the external R1.

Gain [dB]

G1

T1

–6dB/oct

T2

f3f2f1

Fig. 4. Playback equalizer amplifier

frequency response

G2

T3

G3

Frequency [Hz]

G1 = 20 log

G2 = G3 = 20 log

R1 + 300k

R1

R1 + Ri//300k

T1 = C1 · (300k + Ri)

T2, T3 =

C1 · (R1 · 300k + 300k · Ri + Ri · R1)

R1

R1 + R2

– 13 –

4. Music sensor

TAPEIN2

× 1

R2

10k

R1

10k

× 1

VGS

D1

D2

R3

127k

AMP1

R4

100k

C1

64p

AMP2

Vcc

× 5

Full­wave
rectifier

Q1

Smoother

R5A

29k
R5B

10k

R6
1k

CXA2561Q

DVcc

R10

MSOUT

AMP3

0.775V for
signal detection

0.616V for no
signal detection

TAPEIN1

MSLPF

G1FB

C2

C3

R7

G2FB

C4

R8

MSTC

R9

C5

Fig. 5. Music sensor block diagram

(1)Adjustment of music signal detection level

Adjustment the exrernal resistors R7 and R8 to adjust the music signal interval detection level.
The signal detection level v1 and no signal detection level v2 are expressed by the following equations.

v1 = –39 + 20log (39k/Rext) [dBm] Rext: R7 or R8
v2 = v1 – 2 [dBm]

(2)Low-frequency cut-off adjustment of music sensor

Adjust the external resistors R7, R8 and the external capacitors C3, C4 to adjust the low-frequency cut-off.
The low-frequency cut-off is expressed by the following equation.

fc1 = 1/ (2π·Cext ·Rext) Cex, Rext: C3, R7 or C4, R8

(3)High-frequency cut-off adjustment of music sensor

Adjust the capacitor C2 to MSLPF (Pin 10) to adjust the high-frequency cut-off. The high-frequency
cut-off is expressed by the following equation.

fc2 = 1/ (2π·(64p + C2) ·100k)

The high-frequency cut-off is approximately 25kHz when MSLPF is left open.

(4)Response time adjustment

Adjust the external resistor R9 and the external capacitor C5 to adjust the response time.
The response time for signal detection depends on the internal resister R6 and the external capacitor C5.
The response time for no signal detection depends on the external resistor R9 and the external capacitor C5.

– 14 –

CXA2561Q

5. Operating mode control method

The CXA2561Q has a Dolby NR mode select switch (NRMODE), Dolby NR switch (NRSW), mute switch
(MUTE SW), playback equalizer amplifier select switch (TAPESW), head input select switch (DRSW), music
sensor mode select switch (MSMODE) and music sensor switch (MSSW).
The operating modes for each switch are shown in the following table.

Pin No.

15
16
17
18
19
20
21

NRMODE
NRSW
MUTESW
TAPESW
DRSW
MSMODE
MSSW

Pin name

Low (OPEN)

Dolby B type NR

Dolby NR OFF

MUTE OFF

70µs

PBIN FORWARD

G1

MS ON

High

Dolby C type NR

Dolby NR ON

MUTE ON

120µs

PBIN REVERSE

G2

MS OFF

Notes on Operation

1. DIREF pin resistance
The current on DIREF (Pin 25) is the reference for the Dolby NR static characteristic, playback equalizer
amplifier resistor 7kΩ/12kΩ and the comparator threshold value of the music sensor.
Use the resistor with high accuracy for connecting to the DIREF pin.
(The resistance accuracy of 2% <metal-oxide> is recommended.)

Pin voltage

2. Dolby NR
The Dolby NR attack/recovery time is determined by the capacitance connected to TCH (Pins 8 and 23),
and TCL (Pin 9 and 22).
Use the parts, connected to these pins, with high accuracy and small temperature characteristics.
(The capacitance accuracy of 10% <film> is recommended.)

3. Playback equalizer amplifier
The playback equalizer amplifier characteristics are determined by the resistor connected between the IC
internal resistor and PBFB (Pins 31 and 40) and the capacitor connected between PBFB and PBTC (Pins 1
and 30). Use the parts which satisfies the accuracy required for the playback equalizer amplifier.

4. Music sensor
The resistance and capacitance connected to G2FB (Pin 11) and G1FB (Pin 12) determine the detection
level and high-frequency cut-off.
The response time is determined by the resistance and capacitance connected to MSTC (Pin 13).
Use the parts which satisfies the accuracy required for the music sensor.

– 15 –

Example of Representative Characteristics

Supply voltage vs. Current consumption

21.0

20.8

20.6

20.4

20.2

20.0

Current consumption [mA]

19.8

Ta = 25°C

No signal
NR OFF
MUTE OFF
70µs
MS ON

CXA2561Q

5.0 6.0 9.0 10.0 11.0

7.0 8.0
Supply voltage [V]

Playback equalizer amplifier frequency response

65
60
55
50
45

Gain [dB]

40
35
30
25

VCC = 8.0V
Input : PBFIN1
Output : PBOUT1

100 10k

Frequency [Hz]

1k

Ta = 25°C

120µs

70µs

B type decode boost characteristics

12.0

PBFIN

47µ

680

PBREF

PBREF

270

PBFB

0.01µ

300k

7k/12k

PBTC

PBOUT

2.2µ

Fig. 6 Measurement circuit for playback equalizer

amplifier frequency response

C type decode boost characteristics

VCC = 8.0V

12

0dB = Dolby Level

10

8
6
4

Decode boost [dB]

Ta = 25°C

2
0

Frequency [Hz]

10k1k100

–40dB

–30dB

–20dB
–10dB

0dB

– 16 –

VCC = 8.0V

20

0dB = Dolby Level

16
12

8
4

Decode boost [dB]

0

Ta = 25°C

–4

–60dB

–50dB
–40dB

–30dB
–20dB

–10dB

0dB

10k1k100

Frequency [Hz]

Total harmonic distortion (playback equalizer amplifier)

CXA2561Q

VCC = 8.0V

Ta = 25°C

Input : PBFIN1
Output : PBOUT1

1

10

RL = 2.7kΩ

f = 10kHz

0

10

Total harmonic distortion [%]

–1

10

–24 6

–16 –12 –8 –4 0 4

–20

f = 1kHz

f = 100Hz

Output level [dBm]

B type total harmonic distortion (NR OFF included)

C type total harmonic distortion

VCC = 8.0V
Input : TAPEIN1
Output : LINEOUT1
RL = 2.7kΩ
0dB = Dolby Level

0

10

10

–1

NR B
f = 10kHz

Total harmonic distortion [%]

NR OFF

10

–2

–10

f = 1kHz

–6 –2 2 6 10 14

Output level [dBm]

Ta = 25°C

NR B
f = 100Hz

NR B
f = 1kHz

VCC = 8.0V
Input : TAPEIN1
Output : LINEOUT1
RL = 2.7kΩ
0dB = Dolby Level

0

10

–1

10

Total harmonic distortion [%]

–2

10

–10

NR C
f = 1kHz

–6 –2 2 6 10 14

Output level [dB]

Ta = 25°C

NR C
f = 10kHz

NR C
f = 100Hz

– 17 –

CXA2561Q

Ripple rejection ratio (PBOUT)

VCC = 8.0V

–40

RL = 2.7kΩ

–45

–50

–55

–60

Ripple rejection ratio [dB]

–65

100 1k 10k

Crosstalk between channels (1ch → 2ch)

0

VCC = 8.0V

–10

Input : PBFIN1

–20

Output : LINEOUT2

–30

(LINEOUT1 level = 0dBm)
NR OFF

–40
–50
–60

Crosstalk [dB]

–70
–80
–90

–100

100

Frequency [Hz]

1k 10k

Frequency [Hz]

Ta = 25°C

Ta = 25°C

Ripple rejection ratio (LINEOUT)

VCC = 8.0V

–25

RL = 2.7kΩ

–30

–35

–40

–45

Ripple rejection ratio [dB]

–50

–55

PBFIN

47µ

680

PBFB

PBREF

PBREF

270

100 1k 10k

PBTC

NR B

Frequency [Hz]

300k

7k

PBOUT

0.1µ

Fig. 7 Measurement circuit for crosstalk

 between channels

Ta = 25°C

NR OFF

NR C

24dB

TAPEIN LINEOUT

2.2µ

Frequency response for signal and blank detection level

–0
–10
–20

–30
–40

Input level [dBm]

Blank detection level

–50
–60

Blank detection level

VCC = 8.0V
Input : TAPEIN1
G1 : R = 39kΩ, C = 4.7nF
G2 : R = 3.9kΩ, C = 0.47µF

Signal detection level

Signal detection level

100 1k 10k

Frequency [Hz]

Ta = 25°C

G1

G2

– 18 –

CXA2561Q

Signal detection response time (G1)

Input TAPEIN1 f = 5kHz – 38dBm

1.0

TAPEIN1

MSOUT

MSOUT

MSTC

0.1

G1FB

Response time [ms]

0.01

Blank detection response time (G1)

Input TAPEIN1 f = 5kHz

1000

100

TAPEIN1

MSOUT

MSOUT

MSTC

G1FB

14

13

12

Response time

14

13

12

100k

1MEG

39k

VCC

C

0.047µ

0.1

MSTC capacitance [µF]

Response time

VCC

100k

39k

0.0047µ

Ta = 25°C

–10dBm

–30dBm

Ta = 25°C

–20dBm

Signal detection response time (G2)

Input TAPEIN1 f = 5kHz – 58dBm

1.0

TAPEIN1

MSOUT

Response time

MSOUT

14

100k
1MEG

13

0.1

MSTC

G2FB

C

11

3.9k

0.47µF

Response time [ms]

0.01

1.00.01

0.01

0.1

MSTC capacitance [µF]

Ta = 25°C

1.0

Signal detection response time (G2)

Input TAPEIN1 f = 5kHz

1000

TAPEIN1

MSOUT

MSOUT

MSTC

G2FB

100

Response time

14

100k

13

11

3.9k

0.47µF

Ta = 25°C

–30dBm

–40dBm

–50dBm

Response time [ms]

10

0.1

MSTC time constant [s]

Response time [ms]

10

1.00.01

0.1

1.00.01

MSTC time constant [s]

– 19 –

Package Outline Unit: mm

CXA2561Q

40PIN QFP (PLASTIC)

9.0 ± 0.4
+ 0.4

7.0 – 0.1

+ 0.15

(8.0)

21

20

11

10

M

± 0.12

30

31

40

1

0.65

+ 0.15

0.1 – 0.1

0.3 – 0.1

+ 0.35

1.5 – 0.15

0.127 – 0.05

A

+ 0.1

0.1

SONY CODE

EIAJ CODE

JEDEC CODE

0.5 ± 0.2

ADETAIL

QFP-40P-L01

∗QFP040-P-0707

PACKAGE STRUCTURE

PACKAGE MATERIAL

LEAD TREATMENT

LEAD MATERIAL

PACKAGE WEIGHT

EPOXY RESIN
SOLDER / PALLADIUM

COPPER / 42 ALLOY

0.2g

PLATING

NOTE : PALLADIUM PLATING
 This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).

– 20 –