Datasheet AN7374K Datasheet (Panasonic)

■ Overview

The AN7374K, AN7376S are 2-ch dolby B/C type noise
reduction ICs. Filter circuits (MPX filter driver and spectral
skewing, etc.) are incorporated in 28-pin package. It can
configure with very few external parts.

■ Features

•

Fewer external parts

•

Spectral skewing circuit and anti-saturation circuit built-

in.

•

Available for double deck (Through signal output to

REC output at PB mode.)

•

Available for ±2 or 1 power supply

*

Dolby is the trademark of Dolby Laboratories Licensing
Cor-poration.

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

Dolby* B/C Type Noise Reduction IC

28 27 26 25 24 23 22 21 20 19 18 17 16 15

1 2 3 4 5 6 7 8 9 10 11 12 13 14

V

CC

GND

++

++

Buff.

Buff.

Bias

Switch
Logic

Mpx–Dr

Mpx–Dr

V

REF

Stab

SS

SS

Line

Line

VCR–H

Rect–H

Rect–H

OS–H

OS–H

AS

AS

VCR–L

V

REFIREF

VCR–H VCR–L

Rect–L

Rect–L

OS–L

OS–L

■ Block Diagram

1
2
3
4
5
6
7
8

9
10
11
12
13
14 15

16

17

18

19

20

21

22

23

24

25

26

27

28

0.4±0.25 0.451.27

0.1±0.1

0.3

9.4±0.3

0.15

0.925

2.0±0.2

17.81±0.3

Unit : mm

AN7376S

7.2±0.3

28-Lead SOP Package (SOP028-P-0375A)

AN7374K

1
2
3
4
5
6
7
8
9

26.7±0.3

10
11
12
13
14

8.4±0.3

3 ~15˚

10.16±0.25

28-Lead Shrunk DIP Package (SDIP028-P-0400A)

28
27
26
25
24
23
22
21
20
19
18
17
16
15

4.8±0.25

+ 0.1

– 0.05

0.3

Unit : mm

±0.1

0.9±0.25

0.5

1.778

1.05±0.25

3.05±0.25

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

■ Absolute Maximum Ratings (Ta=25˚C)

13.5
22

300

–30 ~ + 80

–55 ~ + 150

V

CC

I

CC

P

D

T

opr

T

stg

Supply Voltage
Supply Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature

V

mA

mW

˚C
˚C

Parameter Symbol Rating Unit

■ Recommended Operating Range (Ta= 25˚C)

Parameter Symbol Range
Operating Supply
Voltage Range

V

CC

9V ~ 13V or ± 4.5V ~ ±6.5V
7V ~ 13V or ± 3.5V ~ ±6.5V

AN7374K
AN7376S

Parameter Symbol min. typ. max. Unit

■ Electrical Characteristics

(Ta

=25˚C

, V

CC

=

12V, In the Dolby Reference Level ; 388mVrms (

= –

6dBm) REC – OUT)

Quiescent Current

12I

CQ

19 mA15

R/P

NR f(Hz) Others

R off

No signal

Rec.– IN to Rec.– OUT Gain

17Grin 21 dB19R off 1k V

in

= 0dB

PB – IN to Rec.– OUT Gain

22Gpin 26 dB24P off 1k V

in

= 0dB

DGmpx – 1 0 1 dBMPX ON/OFF Gain Difference

P →

Pm

off 1k Vin = 0dB

V

lout

LINE – OUT
Output Level

AN7374K
AN7376S

P off 1k V

in

= 0dB

500
330

580
388

670
450

mVrms
mVrms

9.4B – R – 1 11.9 dB10.4R B 10k Vin = – 40dB

B Type
Encode · Boost

6.7B – R – 2 9.7 dB8.2R B 5k V

in

= – 30dB

4.2B – R – 3 7.2 dB5.7R B 1k Vin = – 25dB

– 1.1B – R – 4 1.9 dB0.4R B 10k Vin = 0dB

1
2
3
4

18.1C – R – 1 21.6 dB19.6R C 1k Vin = – 60dB

C Type
Encode · Boost

11.5C – R – 2 15.5 dB13.5R C 5k V

in

= – 40dB

8.7C – R – 3 12.7 dB10.7R C 300 Vin = – 30dB

3.5C – R – 4 7.5 dB5.5R C 5k Vin = – 25dB

1
2
3
4

– 8.3C – R – 5 – 4.3 dB – 6.3R C 15k Vin = 0dB5

V

Omax.

AN7374K
AN7376S

R off 1k

12
12

14
14

dB
dB

THD
= 1%

VCC = 9.0V
VCC = 7.0V

THD

off

0.15 %0.02R off 1k Vin = 0dB

Distortion

THD – C 0.3 %0.13R C 1k V

in

= 0dB

off

C

S/N 60.0 62.5 dBSN Ratio

R

g

= 5.1kΩ

CCIR/ARM

R C

CT – R – P dB – 80P off 1k Vin = 0dB
CT – P – R dB – 80R off 1k Vin = 0dBCrosstalk
CT – C – C dB – 80R off 1k Vin = 0dB

Rec.→PB
PB→Rec.
Ch.→Ch.

V

off

– 70 0 70 mVMode Switching Offset R

off

→C

No signal

Channel Balance

– 1.0D – G

V

1.0 dB0R off 1k Vin = 0dB

9.0VC – P 12.5 V

5.0VC – R 7.0 V

Mode Control
Voltage

– 0.5VC – Pm 3.0 V

PB
Rec.
PBmpx

9.0VC – C 12.5 V

5.0VC – B 7.0 V

Pin3
Applied Voltage

NR Control Voltage

– 0.5VC – off 3.0 V

C
B
off

Condition

Signal · Handling

Pin26
Applied Voltage

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

■ Application Circuits

28 27 26 25 24 23 22 21 20 19 18 17 16 15

1 2 3 4 5 6 7 8 9 10 11 12 13 14

+ +

+ +

AN7374K

28 27 26 25 24 23 22 21 20 19 18 17 16 15

1 2 3 4 5 6 7 8 9 10 11 12 13 14

+ +

+ +

AN7374K

+V

CC

1µF

Rec. In

PB/Rec.
/PBmpx

1µF

PB In

MPX
FIL

2.4kΩ

5.6kΩ

1µF

Line Out

1500pF 1500pF 0.47µF

0.47µF

Rec. Out

GND

Rec. In off/B/C PB In

MPX
FIL

2.4kΩ

5.6kΩ

Line Out

1500pF 1500pF 0.47µF

0.47µF

Rec. Out

1µF 1µF

22kΩ

+V

CC

1µF

PB/Rec.
/PBmpx

1µF

PB In

MPX
FIL

2.4kΩ

5.6kΩ

Line Out

1500pF 1500pF

0.47µF

0.47µF

Rec. OutRec. In

GND

–V

CC

1µF

Rec. In off/B/C PB In

2.4kΩ

MPX
FIL

5.6kΩ

22kΩ

Line Out Rec. Out

1500pF 1500pF

0.47µF

1µF

0.47µF

• For 1 Power Supply

• For ±2 Power Supply

Note) When users use this product, licensing contract should be made between the Dolby Research Center.

Details should be contacted with the following.
Dolby Research Center. Tokyo Office (Far Eastan Continental Inc.)
TEL : [phone]

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

30
28
26
24
22
20
18
16
14
12
10

7 8 9 10 11 12 13 14 15

Current consumption (mA)

V

CC

– Supply voltage (V)

Encode Mode
Ta = 25˚C

Current consumption

C type 10kHz + 10dB

B type 10kHz + 10dB

C type Vin = 0
OFF 10kHz + 10dB
B type V

in

= 0

Encode boost (dB)

10

8

6

4

2

0

100 200 500 1k 2k 5k 10k 20k

Frequency (Hz)

B type encode characteristics

VCC = 12V

– 40
– 35

– 30

– 25
– 20

– 15
– 10

0

– 5

5.0

–30 –20 –10 0 10 20

Output level (dB)

NR OFF total harmonic distortion

2.0

1.0

0.5

0.2

0.1

0.05

0.02

0.01

Total Harmonic distortion (%)

30
28
26
24
22
20
18
16
14
12
10

7 8 9 10 11 12 13 14 15

V

CC

– Current consumption (mA)

V

CC

– Supply voltage (V)

Decode Mode
Ta = 25˚C

Current consumption

C type 10kHz + 10dB

B type 10kHz + 10dB

C type Vin = 0
OFF 10kHz + 10dB
B type V

in

= 0

Encode boost (dB)

20

100 200 500 1k 2k 5k 10k 20k

Frequency (Hz)

C type encode characteristics

– 60

– 40

– 30

– 20
– 10

0

16

12

8

4

0

– 4

– 50

V

CC

= 12V

5.0

–30 –20 –10 0 10 20

Total Harmonic distortion (%)

Output level (dB)

B type total harmonic distortion

2.0

1.0

0.5

0.2

0.1

0.05

0.02

0.01

5.0

–30 –20 –10 0 10 20

Total Harmonic distortion (%)

Output level (dB)

Encode Mode
V

CC

= 12V

C type total harmonic distortion

100Hz
1kHz
10kHz

2.0

1.0

0.5

0.2

0.1

0.05

0.02

0.01

26
24
22
20
18
16
14
12
10

8
6

7 8 9 10 11 12 13 14 15

Signal handling (dB)

V

CC

– Supply voltage (V)

Encode Mode
f = 1kHz
THD = 1%

Signal handling

NR OFF
B type
C type

Encode Mode
V

CC

= 12V

100Hz
1kHz
10kHz

Encode Mode
V

CC

= 12V

100Hz
1kHz
10kHz

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

Crosstalk (dB)

– 20

– 40

– 60

– 80

– 100

100 200 500 1k 2k

C type

10k 20k

Frequency (Hz)

Crosstalk

PB Mode to Rec. Mode
V

CC

= 12V 30kHz LPF

B type
NR OFF

5k

Crosstalk (dB)

– 20

– 40

– 60

– 80

– 100

100 200 500 1k 2k 10k 20k

Frequency (Hz)

Crosstalk

Rec. Mode to PB Mode
V

CC

= 12V 30kHz LPF

5k

C type
B type
NR OFF

Crosstalk (dB)

– 20

– 40

– 60

– 80

– 100

100 200 500 1k 2k

C type

10k 20k

Frequency (Hz)

Crosstalk

Rec. Mode ch to ch
V

CC

= 12V 30kHz LPF

B type
NR OFF

5k

Crosstalk (dB)

– 20

– 40

– 60

– 80

– 100

100 200 500 1k 2k 10k 20k

Frequency (Hz)

Crosstalk

PB Mode ch to ch
V

CC

= 12V 30kHz LPF

5k

C type
B type
NR OFF

100

90

80

70

60

50

7 8 9 10 11 12 13 14 15

S/N (dB)

V

CC

– Supply voltage (V)

CCIR/ARM R

g

= 5.1kΩ

S/N

Total Gain (dB)

30
28
26
24
22
20
18
16

100 200 500 1k 2k 5k 10k 20k

Frequency (Hz)

Total Gain

PB IN to PB OUT (mode : PB, OFF)
PB IN to Rec. OUT (mode : PB, OFF)
Rec. IN to PB OUT (mode : Rec., OFF)
Rec. IN to Rec. OUT (mode : Rec., OFF)

PB · B

PB · C

20
18
16
14
12
10

8
6
4
2
0

7 8 9 10 11 12 13 14 15

Control voltage (V)

V

CC

– Supply voltage (V)

Mode : Rec., PBd, PB

m

NR control voltage threshold

Rec. (MPX ON)

PB

m

(MPX ON)

PBd (direct)

20
18
16
14
12
10

8
6
4
2
0

7 8 9 10 11 12 13 14 15

Control voltage (V)

V

CC

– Supply voltage (V)

Mode : NR OFF, B, C

NR control voltage threshold

B type

NR OFF

C type

PB · OFF

Rec. · B

Rec. · OFF

Rec. · C

V

CC

= ± 6V

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

Equivalent CircuitPin Description

Pin No.

1

Pin Name

GND

Single Supply :
Ground Pin

Input Impedance

Pin Voltage

0

2, 27 Rec. IN

62kΩ
VCC/2

Record Input Pin

3 OFF/B/C

70kΩ
VCC/2

C-type/B-type/NR OFF
Changeover Switching Pin

4, 25 PB IN

40kΩ
VCC/2

Playback Input Pin

5, 24 MPX OUT

70Ω

VCC/2

MPX Drive
Amp. Output Pin

6, 23 MPX IN

≈ ∞

V

CC

/2

MPX Gain Aux.
Amp. Input Pin

200Ω

V

CC

GND

62kΩ

10kΩ

V

CC

GND

60kΩ

200Ω

V

CC

GND

40kΩ

70Ω

V

CC

GND

70Ω

V

CC

GND

■ Pin Description

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

Equivalent CircuitPin Description

Pin No.

Pin Name

Input Impedance

Pin Voltage

7, 22 V

REF

≈ 0

VCC/2

8 I

REF

≈ ∞

1.2V

9, 20 LINE OUT

40

V

CC

/2

Playback Output Pin

10, 19 VCR H

VCC/2

HLS Side Chain
Control Resistor Pin

11, 18 RECT H

0.5V

V

CC

GND

70Ω

V

CC

GND

700Ω

40Ω

V

CC

GND

30Ω

V

CC

GND

V

CC

GND

Reference Voltage
Output Pin

Internal Resistor Error
Calibration Pin

HLS Control Signal
Smoothing Pin

■ Pin Description (Cont.)

ICs for Cassette, Cassette Deck

AN7374K, AN7376S

■ Pin Description (Cont.)

Equivalent CircuitPin Description

Pin No.

Pin Name

Input Impedance

Pin Voltage

12, 17 VCR L

VCC/2

LLS Side Chain
Control Resistor Pin

13, 16 RECT L

0.5V

14, 15 Rec. OUT

60Ω

V

CC

/2

Record Output Pin

21 VRIN

25kΩ
V

CC

/2

Reference Voltage
Input/Ripple Rejection Pin

26

PB/Rec.
/PBmpx

70kΩ
VCC/2

Playback/Record/Playback
– mpx MODE Switching Pin

28 V

CC

Supply Voltage Pin

30

V

CC

GND

V

CC

GND

60Ω

V

CC

GND

V

CC

GND

50k

50k

10kΩ

V

CC

GND

60kΩ

LLS Control Signal
Smoothing Pin