Panasonic AN7374K Datasheet

■ 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]