Panasonic AN7354SC Datasheet

ICs for Cassette, Cassette Deck

■ Overview

The AN7354SC is an IC for 2 ch. Dolby B/C-Type noise
reduction process. It requires fewer external parts and
incorporates the functions of line-output muting and level
detection and the delay circuit.

■ Features

•

Built-in spectral skewing circuit not requiring external

parts

•

Line-output muting circuit built-in

•

PB input delay circuit built-in

•

Built-in level detection circuit for automatic level adjust-

ment and level meter

•

ON/OFF of NR, B-/C-type, REC./PB, MPX and muting
function, and Hi/Lo changeover of level detection gain,
directly-controllable by microcomputer

*

Dolby symbols are the trademarks of Dolby Laboratory
Licensing Corporation. The use of this products
requires the approval of Dolby Laboratories Licensing
Corporation in advance.

AN7354SC

Dolby* B/C-type Noise Reduction

0.45

0.35±0.1

1.0

0.1±0.1

0.3

2.0±0.2

0.9

0.15

1

9.5±0.3

11.5±0.3

Unit : mm

21.25±0.3

42

21 22

42-Lead SSOP Package (SSOP042-P-0450)

■ Block Diagram

V

CC

REC.
IN

Bias

LOGIC

REC.
/PB

MPX
OFF/
ON

LINE
OUT

LEVEL
METER
OUT

REC. OUT

METER
0dB
/20dB

PB
IN

1500pF

5.6kΩ

1µF1µF

100kΩ

1500pF 1500pF

2.4kΩ

42 2241 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23

1 212 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

++

++

+

+

+

+

+

+

++

++

2.2µF

0.1µF

1µF

0.47µF

0.47µF

V

EE

REC.
IN

NR
ON/
OFF

C/B

-type

LINE
OUT

LEVEL
METER
OUT

REC. OUT

Mute
ON/OFF

PB
IN

1500pF

5.6kΩ

2.4kΩ

22kΩ

100kΩ

1500pF

1500pF

2.2µF

0.1µF

1µF1µF

1µF

0.47µF

0.47µF

Delay

Delay

Mute

HLS

HLS

LLS

LLS

Rect

Rect

MPX

MPX

SS

SS

Mute

ICs for Cassette, Cassette Deck

AN7354SC

■ Absolute Maximum Ratings (Ta=25˚C)

V

CC

ICC (+)
I

CC

(–)

P

D

T

opr

T

stg

Supply Voltage

Supply Current (Ta=75˚C)

Power Dissipation (Ta=75˚C)
Operating Ambient Temperature
Storage Temperature

V

mA

mW

˚C
˚C

Parameter Symbol Rating Unit

±6.7

+22
–22
295

–20 ~ + 75

–55 ~ + 125

Parameter Symbol Range

■ Recommended Operating Range (Ta=25˚C)

Operating Supply Voltage Range

V

CC

±4.5V ~ ±6.5V

■ Electrical Characteristics (VCC= ± 6V, Ta=25˚C ± 2˚C)

Parameter Symbol Condition min. typ. max. Unit

Total Circuit Current

Note 1)

12I

CC

20 mA16

REC., OFF, No input signals

G

rin

17 19 21 dB

REC., OFF, f = 1kHz
REC. – OUT Level 388mV

REC. – IN to REC. – OUT
I/O Gain

Note 2)

G

pin

22 24 26 dB

PB, OFF, f = 1kHz
REC. – OUT Level 388mV

PB – IN to REC. – OUT
I/O Gain

Note 3)

DG

mpx

– 1 0 1 dB

PB, OFF, f = 1kHz
Gain difference from Gpin

MPX ON/OFF Gain Difference

V

lout

510 570 640 mVrms

PB, OFF, f = 1kHz
V

in

= 0dB

LINE – OUT Level

BR – 1 9.4 10.4 11.9 dB

REC., B, f = 10kHz
V

in

= – 40dB

B-type Encode Boost (1)

BR – 2 6.7 8.2 9.7 dB

REC., B, f = 5kHz
V

in

= – 30dB

B-type Encode Boost (2)

BR – 3 4.2 5.7 7.2 dB

REC., B, f = 1kHz
V

in

= – 25dB

B-type Encode Boost (3)

BR – 4 – 1.1 0.4 1.9 dB

REC., B, f = 10kHz
V

in

= 0dB

B-type Encode Boost (4)

CR – 1 18.1 19.6 21.6 dB

REC., C, f = 1kHz
V

in

= – 60dB

C-type Encode Boost (1)

CR – 2 11.5 13.5 15.5 dB

REC., C, f = 5kHz
V

in

= – 40dB

C-type Encode Boost (2)

CR – 3 8.7 10.7 12.7 dB

REC., C, f = 300Hz
V

in

= – 30dB

C-type Encode Boost (3)

CR – 4 3.5 5.5 7.5 dB

REC., C, f = 5kHz
V

in

= – 25dB

C-type Encode Boost (4)

CR – 5 – 8.3 – 6.3 – 4.3 dB

REC., C, f = 15kHz
V

in

= 0dB

C-type Encode Boost (5)

V

Omax.

12 13 dB

REC., OFF, f = 1kHz
V

CC

= ±4.5V THD = 1%

Signal Handling

THDO 0.02 0.15 %

REC., OFF, f = 1kHz
V

in

= 0dB

Total Harmonics Distortion – off

THDC 0.13 0.3 %

REC., C, f = 1kHz
V

in

= 0dB

Total Harmonics Distortion – C

S/N 60.0 62.5 dB

REC., C, R

g

= 5.1kΩ

CCIR/ARM Weighted

Signal to Noise Ratio

Vofs – R –70 0 70 mV

REC., OFF, → C switch,
REC.

–

OUT potential fluctuation

Mode Switch Offset

Note 1) REC., OFF in the condition description, expresses that MODE is REC. and NR is OFF. The same for the following.
Note 2) Obtain the input voltage of REC. – IN when the output voltage of REC. – OUT becomes 388mVrms. For this input

voltage, the reference level in REC. is assumed 0dB.

Note 3) Obtain the input voltage of PB. – IN when the output voltage of REC. – OUT becomes 388mVrms. For this input voltage,

the reference level in PB is assumed 0dB.

ICs for Cassette, Cassette Deck

AN7354SC

Parameter Symbol Condition min. typ. max. Unit

VPS (1) 2 3 4 VDelay Output (1)

V

in

= – 0.2V

S30 → C PB MPX off
Piny and Pin#7 DC Potential

VPS (2) 4 6 8 VDelay Output (2)

V

in

= + 0.2V

S30 → C PB MPX off
Difference from VPS (1)

VPS (3) – 0.1 0 0.1 VDelay Output (3)

V

in

= – 0.2V

S30 → B PB MPX off
Piny and Pin#7 DC Potential

VPS (4) – 0.2 0 0.2 VDelay Output (4)

V

in

= + 0.2V

S30 → B PB MPX off
Difference from VPS (3)

VPS (5) – 4 –3 –2 VDelay Output (5)

V

in

= – 0.2V

S30 → A PB MPX off
Piny and Pin#7 DC Potential

VPS (6) 4 6 8 VDelay Output (6)

V

in

= + 0.2V

S30 → A PB MPX off
Difference from VPS (5)

CB –1 0 1 dB

Gain difference between
channels, Grin and Gpin

Channel Balance

THDP 0.02 0.15 %

PB, OFF, f = 1kHz
V

in

= 0dB, LINE – OUT

Total Harmonics Distortion Line Out

G

mut

–85 –75 dB

PB, OFF, Mute ON
f = 1kHz, V

in

= 0dB

Line Mute Attenuation

Vofs – M –20 0 20 mV

Mute OFF → ON switching,
LINE – OUT potential fluctuation

Line Mute Offset

VDC (1) 0.9 1.0 1.1 V

PB, OFF, LMG Normal
f = 1kHz, V

in

= – 3dB

Level Meter Output (1)

Note 4)

VDC (2) 3.6 4.0 4.4 V

PB, OFF, LMG Normal
f = 1kHz, V

in

= +9dB

Level Meter Output (2)

VDC (3) 0.9 1.0 1.1 V

PB, OFF, LMG High
f = 1kHz, V

in

= –18dB

Level Meter Output (3)

Vofs – L –15 0 15 mV

PB, OFF, LMG Normal
No Input

Level Meter Output Offset

Note 4) LMG in the condition description is an abbreviation of Level Meter Gain.

■ Electrical Characteristics (Cont.) (VCC= ± 6V, Ta=25˚C ± 2˚C)

ICs for Cassette, Cassette Deck

AN7354SC

Parameter Symbol Condition min. typ. max. Unit

■ Electrical Characteristics (Ta=25˚C±2˚C) [Design Reference Values]

The following characteristic values are reference values for design but not guaranteed values.

REC.– IN Input Resistance

56.4Rin – RI 75.6 kΩ64

PB – IN Input Resistance

28.05Rin – PI 37.95 kΩ33

V

mut (1)

4.4 6.4 8.4 VDecreased Voltage Mute (1)

PB, OFF, Mute OFF, f=1kHz,
V

in

= 0dB Voltage between

Pins1 and 42 when mute functions

CT– RP –80 –70 dB

PB, OFF, f

= 1kHz

V

in

= 0dB (At REC)

Crosstalk,
REC.– IN to LINE– OUT

CT– CC –80 –70 dB

PB, OFF, f

= 1kHz

V

in

= 0dB

Crosstalk, Cannel to Cannel

VCPB +2.5 +6 V

Pin35 applied DC voltage when
PB, MPX are OFF

PB/REC. Control Voltage PB

VCREC. –1.5 +1.5 VPB/REC. Control Voltage REC.

Pin35 applied DC voltage when
PB, MPX are ON

VCMon –1.5 +1.5 VMPX Control Voltage ON

Pin34 applied DC voltage when
PB, MPX are ON

VCMoff +2.5 +6 VMPX Control Voltage OFF

Pin34 applied DC voltage when
PB, MPX are OFF

VCMnor +2.5 +6 VMeter Control Voltage Normal

Pin33 applied DC voltage when
Meter becomes Normal

VCMhi –1.5 +1.5 VMeter Control Voltage Hi

Pin33 applied DC voltage when
Meter becomes Hi

VCON +2.5 +6 VNR Control Voltage ON

Pin8 applied DC voltage when
NR is ON

VCOFF –1.5 +1.5 VNR Control Voltage OFF

Pin8 applied DC voltage when
NR is OFF

VCC +2.5 +6 VB/C Control Voltage C

Pin9 applied DC voltage for
C-type NR

VCB –1.5 +1.5 VB/C Control Voltage B

Pin9 applied DC voltage for
B-type NR

VCMUon +2.5 +6 VMute Control Voltage ON

Pin10 applied DC voltage when
Mute is ON

VCMUof –1.5 +1.5 VMute Control Voltage OFF

Pin10 applied DC voltage when
Mute is OFF

CT– PR –80 –70 dB

PB, OFF, f

= 1kHz

V

in

= 0dB (At PB)

Crosstalk,
PB– IN to REC.– OUT