HIT HA12157NT, HA12155NT Datasheet

HA12155NT/HA12157NT

Audio Signal Processor for Cassette Deck (Dolby B/C-type NR

with Recording System)

ADE-207-115C (Z)

4th Edition

June 1997

Description

HA12155NT/HA12157NT is silicon monolithic bipolar IC providing Dolby noise reduction system*, electrical volume system, REC equalizer system and level meter system in one chip.

Functions

• REC equalizer × 2 channel

• Dolby B/C NR × 2 channel

• Electronic volume × 2 channel

• Level Meter × 2 channel

Features

• Inductor less REC equalizer is adjustable of its characteristics by external resistor

• Rec level is adjustable automatically with electrical vo lu me which is built-in

• 3 type of input selection is available (one is by way of electrical volume)

• Separate input selection SW and REC/PB SW

• Dolby noise reduction with dubbing cassette decks

(Unprocessed signal output available from recording out terminals during PB mode)

• Log-compressed level meter output is range from 0 V to 5 V

(Usable as music search switchable gain of 0 dB and 20 dB respectivily)

• Normal-speed/high-speed (Double), normal/metal/chrome fully electronic control switching built-in

• NR-ON/OFF, Dolby B/C, MPX ON/OFF fully electronic control switching built-in

(Controllable from micro-controller directly)

• Reduction of number of pin by transfered serial data to electronic volume control switching and another

control switching (Controllable from micro-controller directly)

• Low external parts count

HA12155NT/HA12157NT

* Dolby is a trademark of Dolby Laboratories Licensing Corporation.

A license from Dolby Laboratories Licensing Co r por ation is required for the use of this IC.

Ordering Information

Operating voltage

Type Package Dolby Level REC-OUT Level PB-OUT Level Min Max

HA12155NT DP-64S 300 mVrms 300 mVrms 580 mVrms 9.5 V 16 V HA12157NT 775 mVrms 12 V 16 V

Rev.4, Jun. 1997, page 2 of 57

Block Diagram

LM

EQ

OUT(L)

GND

(2)

OUT(L)

LM

IN(L)

EQ

HC

NN NC NM HN

IN(L)

HM

HA12155NT/HA12157NT

RECT

32321 31 30 29

FM fQ f/Q GH GL GP

26 27 28 25

EQ

IREF

IN(R)

LM

OUT(R)

LM

OUT(R)

IN(R)

33 34

36 35 37 38 39

REC

EQ

41 40 42 43

RECT

LMA

+

–

REC

EQ

+

–

LMA

EQ-Controller

REC

OUT(L)

PB OUT

(L)

Vref

NRIN

IA OUT

(L)

DGND

PBI

(L)

RPI

(L)

CNT

(L)

VRI

(L)

GND

(1)

(L)

M

BIAS

DATA CLK STB

REC

PBOUT

NRIN

(R)

X

INJ

PBI REF

RPI CNT VRI

CC

V

MPX

C/B

NR

(R)

Vref

(R)

IA OUT

(R)

(R) (R) (R)

ON/OFF

OUT(R)

19 20 21 22 23 24 47 46 45 44 48

Dolby B/C NR

51 50 49 52 53

P

X

54

6BIT

Shift

register

IA

DAC

Latch

E VOL

Decoder

55

58 57 56 59 60 61 62

64 63

Dolby B/C NR

IA

6BIT

E VOL

BIAS

SW

DAC

18

17

13 14 15 16

M

6 7 8 9 10 11 12

45

P

Rev.4, Jun. 1997, page 3 of 57

HA12155NT/HA12157NT

Absolute Maximum Ratings

Item Symbol Ratings Unit

Supply voltage V

CC

Power dissipation*1 Pd 770 mW Operating temperature Topr –30 to +75 °C Storage temperature Tstg –55 to +125 °C Note: 1. Value at Ta ≤ 75°C

Electrical Characteristics (Ta = 25°C VCC = 14 V Dolby level 300 mVrms)

Item Symbol Min Typ Max Unit Test conditions Notes

Quiescent current I Input amp gain G

Q

RPI 18.5 20.0 21.5 dB Vin = 0 dB, f = 1 kHz

VIA

G

PBI 18.5 20.0 21.5

VIA

B-type NR Encode Boost B-ENC-2K 2.8 4.3 5.8 dB Vin = –20 dB, f = 2 kHz

B-ENC-5K 1.7 3.2 4.7 Vin = –20 dB, f = 5 kHz

C-type NR Encode Boost C-ENC-1K(1) 3.9 5.9 7.9 dB Vin = –20 dB, f = 1 kHz

C-ENC-1K(2) 18.1 19.6 21.6 Vin = –60 dB, f = 1 kHz C-ENC-700 9.8 11.8 13.8 Vin = –30 dB, f = 700 Hz

Signal handling Vomax 12.0 13.0 — dB f = 1 kHz, THD = 1%,

Signal to noise ratio S/N 60.0 63.0 — dB Rg = 5.1 kΩ, CCIR/ARM Total harmonic distortion THD — 0.08 0.3 % Vin = 0 dB, f = 1 kHz Crosstalk CT (R↔L) — –85.0 –79.0 dB Vin = 0 dB, f = 1 kHz

CT (RPI↔PBI) — –80.0 –74.0

CT (VRI↔RPI) — –77.0 –71.0 Control Hi level V voltage Lo level V Serial data Hi level V voltage Lo level V

cH

cL

sH

sL

PB-out level HA12155 Vout 500 580 670 mVrms Vin = 0 dB, f = 1 kHz

HA12157 665 775 900 PB-offset Vofs –100 0.0 +100 mV no signal Channel balance ∆G Volume gain G

VVR (MAX)

G

VVR (MIN)

V

— 29.0 37.0 mA no signal

3.5 — 5.3 V MPX ON/OFF, NR –0.2 — 1.0 ON/OFF C-NR/B-NR

3.5 — 5.3 V CLK, DATA, STB –0.2 — 1.0

–1.0 0.0 1.0 dB Vin = 0 dB, f = 1 kHz

17.5 19.3 21.5 dB Vin = 100 mVrms, f =1 kHz — — –55.0 Vin = 3 Vrms, f = 1 kHz

16 V

V

= 12 V

CC

*1

Rev.4, Jun. 1997, page 4 of 57

HA12155NT/HA12157NT

Electrical Characteristics (Ta = 25°C VCC = 14 V Dolby level 300 mVrms) (cont)

Item Symbol Min Typ Max Unit Test conditions Notes

Volume mute G

VVR (MUT)

Max-input level to volume Vin max (VR) 11.0 12.6 — dBs f = 1 kHz, THD = 1%,

Volume S/N S/N (VR) 78.0 84.0 — dB Vin = 100 mVrms, f = 1

Volume THD THD (VR) — 0.04 0 .3 % Vin = 100 mVrms, f = 1

Equalizer gain G

V EQ (500)

G

V EQ (1K)

G

V EQ (5K)

G

V EQ (10K)

G

V EQ (20K)

Equalizer maximum input Vin max (EQ) –8.0 –7.0 — dBs f = 1 kHz, THD = 1%,

Equalizer S/N S/N (EQ) 57.0 62.0 — dB Rg = 5.1 kΩ, A-WTG Equalizer THD THD (EQ) — 0.2 0.5 % Vin = 77.5 mVrms,

Equalizer offset Vofs (EQ) –400 0.0 +400 mV no signal Level meter output LM (0 dB) 2.60 2.85 3.10 V Vin = 0 dB, f = 1 kHz *2

LM (12 dB) 3.60 3.90 4.20 V Vin = 12 dB, f = 1 kHz

Level meter output LM (–20 dB)1 0.80 1.10 1.40 V Vin = –20 dB, f = 1 kHz *2

LM (–20 dB)2 2.55 3.0 3.15 V Vin = –20 dB, f = 1 kHz,

Level meter offset LMofs 1 — 150 300 mV no signal

LMofs 2 — 200 350 no signal, –20 dB range

Notes: 1. HA12155 VCC = 9.5 V, HA12157 VCC = 12 V

2. 0 dB = PB-OUT level

— — –80.0 dB Vin = 3 Vrms, f = 1 kHz

V

= 12 V

CC

kHz, A-WTG

kHz

13.0 15.0 17.0 dB Vin = 77.5 mVrms, f = 500 Hz

13.0 15.0 17.0 Vin = 77.5 mVrms, f = 1 kHz

14.5 16.5 18.5 Vin = 77.5 mVrms, f = 5 kHz

18.5 20.5 22.5 Vin = 77.5 mVrms, f = 10 kHz

29.5 32.0 34.5 Vin = 77.5 mVrms, f = 20 kHz

= 12 V

V

CC

f = 1 kHz

–20 dB range

*1

Rev.4, Jun. 1997, page 5 of 57

HA12155NT/HA12157NT

Test Circuit

SW16

R

SW15

ON OFF

L

SW14

LM

PB

DC VM 2

EQ

REC

Mode

controller

SW12

PB

REC

R72

AC VM 2

EQ

16 k

PB

R22

R25

10 k

SW8

SW4

RP

7.5 k

L

TP3 TP4

SW10

C30

R19

10 k

µ

C20

4.7

+

µ

C21

0.47

R71

51 k

R20

100 k

++

µ

1

C23

C22

0.1

µ

R21

20 k

2.2

C24

+

µ

0.1

µ

0.1

C27 C26 C25

2200p

R23

C29

2200p

µ

2200p

R24

2.2

C28

+

SW25

R26

R27

ON

OFF

Degital

GND

µ

C1

R28

10 k

0.47

R29

18 k

µ

R66

5.1 k

C2

+

µ

1 0.47

C33

R67

5.1 k

+

C3

µ

++

0.47

C62

10p

3

R6

10 k

R5

VR

10k

10p

C61

R4

10p

C60

560

22 k

5.6 k

2.4 k

10 k

33

34

GL GP

36 35

NN NC NM HN HC HM

38 37

52 51 50 49 48 47 46 45 44 43 42 41 40 39

54 53

55

58 57 56

59

64 63 62 61 60

FM FQ F/Q GH

EQ

OUT(R)

EQ

OUT(L)

IREF

GND

(2)

EQ

IN(R)

EQ

IN(L)

LM

OUT(R)

LM

OUT(L)

LM

DET(R)

LM

DET(L)

LM

IN(R)

LM

IN(L)

REC

OUT(R)

REC

OUT(L)

DP-64S

LLS

DET(R)

LLS

DET(L)

HLS

DET(R)

HLS

DET(L)

CCR

(R)

CCR

(L)

SS2

(R)

SS2

(L)

SS1

(R)

SS1

(L)

PBOUT

(R)

PBOUT

(L)

HA12155/7 NT (REC 1 CHIP)

REF

V

(R)

V

(L)

NRIN

(R)

NRIN

(L)

IA OUT

(L)

IA OUT

(R) INJ

DGND

PBI

(R)

PBI

(L)

REF

BIAS

RPI

(L)

RPI

(R)

CNT

(L)

CNT

(R)

VRI

(R)

VRI

(L)

CC

V

GND

(1)

MPX

ON/OFF

C/B

DATA CLK STB

NR

ON/OFF

32

29

28 30 31

R30 R31 R32 R33 R34 R35

µ

C19

4.7

+

26 27

25

R17

24 k

+

24

C18

23

+

22

C16

21

µ

+

C15

20

19

18

17

C12 C13 C14

16

R13

560

15

R11

22 k

13 14

R10

5.6 k

12

R9

2.4 k

11

R8

1.2 k

10

+

µ

C8

0.47

+

89

µ

C7

1

+

7

µ

C6

0.47

+

6

µ

C5

1

+

µ

C4

0.47

345

R3

22 k

2

R2

22 k

1

R1

22 k

R36 R37 R38 R39 R40 R41

R42 R43 R44 R45 R46 R47

µ

0.47

R16

µ

1

µ

C17

0.1

R14

20 k

2.2

µµ

0.1 0.1

2200p

2200 p

C10

2200 p

C9

+

C11

SW24

OFF

R7

10 k

R69

5.1 k

R68

5.1 k

SW19 SW20

SW18

100 k

µ

2.2

ON

C32

OFF ON

cb

ON

OFF

µ

100

R48 R49 R50 R51 R52 R53

R18

R15

SW9

TP2TP1

10 k

7.5 k

R12

+

SW22

SW21 SW23

10 k

SW7

SW13

Noise meter

with CCIR/ARM filter

and A–WTG filter

LM

EQ

REC

L

SW17

100k 51 k 51 k 33 k 33 k 33 k

R

SW11

EQ

PB

REC

R61 R62 R63 R64 R65

R54 R55 R56 R57 R58 R59

R60

R70

51k

Noise meter

PB

Oscilloscope

Distortion

analyzer

Ω

Notes 1: Registor tolerance are ±1 %

2: Capacitor tolerance are ±1 %

3: Unit R: C:F

AC VM 4

R75

16 k

AC VM 3

DC

Source 3

DC

Source 2

14 V 5 V

DC

S3 S2 S3

PB

RP

VR

SW3

EQ

OFF

R

ON

L

S2 S3 S2

Source 1

SW1

Audio SG AC VM 1

Rev.4, Jun. 1997, page 6 of 57

Example of Split Supply Circuit

EQOUT (L)

LMOUT (L)

R19

10 k

C20

R22

PBOUT (L)

PBI (L)

RECOUT (L)

EQIN (L)

R72

TP3

RPI (L)

16 k

TP4

VRI (L)

R25

7.5 k

10 k

C30

R71

R20

2.2µ

51 k

100 k C22

+

R67

1µ

R21

C29C28

R28

R66

5.1 k

C62

C61

C60

C23

20 k

C26 C25

C27

2200 p 2200 p

Degital GND

10 k

C1

5.1 k

C33 C2

C3

10p

C21

C24

R29

R6

R5

R4

0.1µ

0.1µ 0.1µ

2200 p

R23

R24

R26

R27

10 k

NN NC NM HN HC HM

0.47µ

EQ

+

OUT (L) (2)

GND

0.47µ

EQ

+

IN (L)

LM

OUT (L)

LM

DET (L)

LM

IN (L)

2.2µ

REC

++

OUT (L)

LLS

DET (L)

HLS

DET (L)

(L)

CCR

(L)

SS2

560

(L)

SS1

22 k

(L)

PBOUT

(L)

Vref

5.6 k

2.4 k

0.47µ

+

18 k

0.47µ

+

1µ

0.47µ

++

HA12155/7 (REC 1 CHIP) DP-64S

(L)

NRIN

(L)

DGND IAOUT

(L)

BIAS PBI

(L)

RPI

(L)

CNT

(L)

VRI

(1)

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

DATA CLK STB GND

R35

R34

R33

R32

R31

R30

+

4.7 µ

C19

EQ

OUT (R) FM FQ FQ GH GL GP

IREF

++

EQ

IN (R)

C18

LM

OUT (R)

LM

DET (R)

C16

LM

IN (R)

+

C15

2.2 µ

REC

OUT (R)

LLS

DET (R)

HLS

DET (R)

(R)

CCR

C12 C13 C14

(R)

SS2

R13

560

(R)

SS1

R11

22 k

(R)

PBOUT

(R)

Vref

R10

5.6 k

(R)

NRIN

R9

2.4 k

(R)

IAOUT

R8

PBI

(R) INJ

(R) REF

PRI

++++

(R)

CNT

C5 C6 C7 C8

1µ 0.47µ 1µ 0.47µ

+

(R)

VRI

C4

0.47µ

CC

MPX

ON/OFF V

R3

22 k

R2

22 k

1234567891011121314151617181920212223242526272829303132

NR

ON/OFF C/B

R1

22 k

R41

R40

R39

R38

R37

R36

R17

0.47µ

0.1 µ 0.1 µ

2200 p

*1

HA12155NT/HA12157NT

R47

R53

R59

R65

R46

R52

R58

R64

R45

R51

R57

R63

R44

R50

R56

R62

R43

R49

R55

R61

EQOUT (R)

R42

R48

R54

R60

R18

10 k

R15

7.5 k R70

51 k

R16

100 k

1 µ

C17

0.1 µ

R12

R75

10 k

C9 C10

R14

20 k

2200 p2200 p

C11 +

2.2 µ

TP2

R7

10 k

R69

5.1 k

R68

5.1 k

VRI (R)

RPI (R)

100 k 51 k 51 k 33 k 33 k 33 k

EQIN (R)

16 k

TP1

RBI (R)

LMOUT (R)

RECOUT (R)

PBOUT (R)

C34

100µ

+

CC

Ω

3.6

INJ EE

V – V – 0.7

R8 = (k )

The value of external resistor R8 is obtained by using following equations.

Note 1: The pin 10 can connect to V 1 through R8.

C32

100µ

+

CN1

1

STB

2

CLK

3

DATA

4

5

MPX

DGND

ON/OFFNRON/OFF

1

2

GND

3

1

EE

CC

V

CN2

6

7

8

2

C/B

CC

V

(+5 V)

Rev.4, Jun. 1997, page 7 of 57

HA12155NT/HA12157NT

Mode Controller

CC

V (+5 V)

GND

SW1 SW2 SW3

+

3

R

NR•ON/OFF

1

JP1

5

R

22 K

4

R

22 K

2.2 µ

+

1 M

2

R

22 k

µ

4

C

100

17

R

N13 IC8

N1 IC6

PR

TRIGGER

Q

1

C

1

R

C/B

6

22 k

Q

22 k

JP2

Q D

Q

MPX•ON/OFF

5

CLR

JP3

9

D IC9

Q

Q D

PR

D

Q

C

Q

B

Q

A

Q

2

D IC2

1

D IC2

TRIGGER

SW9

CLR

3

D IC3

N5 IC8

IC 1

N3 IC6 N4 IC8

N2 IC8

X'tal OSC

N11 IC8 N12 IC8

MCLK

8

D IC3

STB

1

GND

4

CC

CLK

V (+5 V)

8

2

DATA

3

N8 IC7

6

D IC5

N6 IC6

Q

Q D

5

D IC5

Q

Q D

4

D IC5

Q

Q D

CLR

N7 IC6

N9 IC7

N10 IC7

Ω

µ

H

Q

SHIFT

LOAD

CLK

SW10

62.5 kHz

125 kHz

250 kHz

500 kHz

3

C

2

C

X'tal

120 p

1 MHz

10 p

14

R

22 k

13

R

22 k

12

R

22 k

11

R

22 k

10

R

22 k

9

R

22 k

8

R

22 k

7

R

22 k

D

Q

C

Q

B

Q

A

Q

CLR

4

R

510

22

R

1M

SW1

SW7 SW6 SW5 SW4 SW3 SW2

SW8

INHIBIT

CLK

ABCDEFG H

Type

Parts No.

Ω

7

D IC4

4: Unit R : , C : F

2: As for IC1-IC9, input pins which are not used should be pulled up with resistor of 22 k .

3: As for IC1-IC9, required to put 0.1 F-capacitor between near GND pin and Voltage source pin for bypass.

Notes 1: HC type IC which operate eqaully is also applicable instead of IC1-IC9.

HD74HC221

HD74HC74

HD74HC393

HD74HC165

HD74HC175

HD74HC00

HD74HC04

HD74HC74

IC1

IC2

IC3

IC4

IC5

IC6

IC7

IC8

IC9

Rev.4, Jun. 1997, page 8 of 57

HA12155NT/HA12157NT

Pin Description (VCC = 14 V, Ta = 25°C, No signal, the value in the table show typical

value)

Pin No. Terminal DC DP-64S name Zin voltage Equivalent circuit Description

7 RPI 100 kΩ VCC/2 Recording input 58

9 PBI Play back input 56 21 LM IN HA12155

---75 kΩ

44 HA12157

---100 kΩ 24 EQ IN 100 kΩ Equalyzer input 41 5 VRI 100 kΩ VCC/2 Volume input 60 +0.7 V 4VCC—VCC— Power supply 8REF—V 12 NR IN — VCC/2 NR processor input 53

/2 — Ripple filter

CC

Level met er input

15 SS 1 — VCC/2 Spectral skewing amp

input

50

Rev.4, Jun. 1997, page 9 of 57

HA12155NT/HA12157NT

Pin Description (VCC = 14 V, Ta = 25°C, No signal, the value in the table show typical

value) (cont)

Pin No. Terminal DC DP-64S name Zin voltage Equivalent circuit Description

17 CCR — VCC/2 Current controled 48 resistor output

11 IA OUT — VCC/2 Input amp output 54

V

CC

GND

13 VREF Reference voltage 52 buffer output 14 PB OUT Play back (Decode) 51 output 16 SS 2 Spectral skewing 49 amp. output 20 REC OUT Recording (Encode) 45 output 26 EQ OUT Equalyzer output 39

Rev.4, Jun. 1997, page 10 of 57

HA12155NT/HA12157NT

Pin Description (VCC = 14 V, Ta = 25°C, No signal, the value in the table show typical

value) (cont)

Pin No. Terminal DC DP-64S name Zin voltage Equivalent circuit Description

18 HLS DET — 2.3 V Time constant pin for 47 rectifier

19 LLS DET 46 57 BIAS — 0.28 V

GND

25 IREF — 1.2 V EQ Reference current

Dolby NR Reference current input

input

27 FM EQ Parameter current 28 fQ input 29 f/Q 30 GH 31 GL 32 GP

Rev.4, Jun. 1997, page 11 of 57

HA12155NT/HA12157NT

Pin Description (VCC = 14 V, Ta = 25°C, No signal, the value in the table show typical

value) (cont)

Pin No. Terminal DC DP-64S name Zin voltage Equivalent circuit Description

33 HM — —

GND

34 HC 35 HN 36 NM 37 NC 38 NN 6 CNT 5.2 kΩ VCC/2- DAC output Volume 59 1.5 V to

/2

V

CC

V / 2

CC

EQ Parameter selector

control input

DAC

out

22 LMD — 0.2 V Time constant Pin for 43

LM OUT

GND

LMD

23 LM OUT — 0.2 V Level meter output 42

level meter

Rev.4, Jun. 1997, page 12 of 57

HA12155NT/HA12157NT

Pin Description (VCC = 14 V, Ta = 25°C, No signal, the value in the table show typical

value) (cont)

Pin No. Terminal DC DP-64S name Zin voltage Equivalent circuit Description

1NR

ON/OFF

2C/B 3MPX

ON/OFF 62 STB 63 CLK 64 DATA 10 INJ — 0.7 V — Injection current input

55 D-GND — 0.0 V — Digital (Logic) ground 40 GND — 0.0 V — Ground 61

100 kΩ —

GND

D - GND

Mode control input

2

L

for I

Application Note

Power Supply Range

HA12155NT/HA12157NT are designed to operate on either single supply or split supply.

The operating range of the supply voltage is shown in table 1.

Table 1 Supply Voltage

Type No. Single supply Split supply

HA12155NT 9.5 V to 16 V ±6 V to 8 V HA12157NT 12 V to 16 V ±6 V to 8 V

The lower limit of supply voltage depends on the line output reference level.

Rev.4, Jun. 1997, page 13 of 57

HA12155NT/HA12157NT

The minimum value of the headroom margin is specified as 12 dB by Dolby Laboratories. HA12155 series are provided with two line output level, which will permit an optimum headroom margin for power supply conditions.

Reference Voltage

For the single supply operation these devices provide the reference voltage of half the supply voltage that is the signal grounds. As the peculiarity of these devices, the capacitor for the ripple filter is very small about 1/100 compared with their usual value. The Reference voltage are provided for the left channel and the right channel separately. The block diagram is shown as figure 1.

V

CC

+

–

8

+

1 F

µ

–

+

52

L channel reference

R channel reference

13

Figure 1 The Block Diagram of Reference Voltage Supply

Operating Mode Control

HA12155NT/HA12157NT provides fully electronic switching circuits. NR-ON/OFF, C/B, and MPX ON/OFF switches are controlled by parallel data (DC voltage) and other switches are controlled by serial data.

Rev.4, Jun. 1997, page 14 of 57

HA12155NT/HA12157NT

Table 2 Threshold Voltage (VTH)

Pin No. Lo Hi Unit

1, 2, 3 –0.2 to 1.0 3.5 to 5.3 V 62, 63, 64 –0.2 to 1.0 3.5 to 5.3 V Notes: 1. Voltages shown above are determined by internal circuits of LSI when take pin 55 (DGND pin) as

reference pin. On split supply use, same V pin.

This means that it can be controlled directly by micro processor.

2. Each pins are on pulled down with 100 kΩ inter nal resi stor. Therefore, it will be low-level when each pins ar open.

3. Note on serial data inputting (a) The clock frequency on CLK must be less than 500 kHz. (b) Over shoot level and under shoot level of input signal must be the value shown below. (c) The serial input pins (pins 62, 63, and 64) are extremely sensitive to undershoot, overshoot,

ringing, and noise. This can result in malfunctions due to problems with the wiring pattern. We recommend attaching capacitors in parallel with the serial input pins to ameliorate this problem.

Figure 2-b shows an example of this circuit appropriate when the clock frequency is 500 kHz. The value of the capacitor should be set in accordance with the clock frequency actually used.

4. NR Mode Switching In actual use, pop noises may accompany NR on/off switching in C mode. To avoid these

noises, use the following sequences to turn NR on and off. From C mode NR off to C mode NR on: (C mode, NR off) → (B mode, NR off) → (B mode, NR on) → (C mode, NR on). From C mode NR on to C mode NR off: (C mode, NR on) → (B mode, NR on) → (B mode, NR off) → (C mode, NR off).

can be offered by connecting DGND pin to GND

TH

Table 3 Switching Truth Table

Pin No. Lo Hi

1 NR-OFF NR-ON 2 B-NR C-NR 3 MPX-ON MPX-OFF Notes: 1. Low level will be offered when each pins are open.

2. Please refer to next term as for the serial data for formatting.

When connecting microcomputer or Logic-IC with HA12155NT/HA12157NT directly, there is apprehension of rash-current under some transition timming of raising voltage or falling voltage at V ON/OFF.

For this countermeasure, connect 10 kΩ to 20 kΩ resistor with each pins. It is shown in test circuit.

Rev.4, Jun. 1997, page 15 of 57

CC

HA12155NT/HA12157NT

under 5.3 V

0

within –0.2 V

Figure 2 Input Level

Serial Data Formatting

8 bit shift register is employed. CLK and DATA are stored during STB being high and data is ratched when STB goes high to low. The clock frequency on CLK must be less than 500 kHz.

5 V

CLK

0 V

STB

5 V 0 V 5 V 0 V

01234567

latch of data

DATA

Figure 3 Serial Data Timming Chart

Rev.4, Jun. 1997, page 16 of 57

HA12155NT/HA12157NT

Table 4 Serial Data Formatting

Bit

Control

No.

register

0 TAPE H DAC0

SELECT 1 L

1 TAPE H DAC1 *mute is implemented when all

SELECT 2 L bits are high.

2 TAPE H High (double) speed selection DAC2

SPEED L Normal speed selection

3 METER H Meter sensitivity 20 dB up DAC3

SENSITIVITY L Meter sensitivity normal

4 INPUT H DAC4

SELECT 1 L

Volume register

TS1

TS2

H

L

IS2

H

HL

TAPE

IS1

HL

PB

IV

II

I

TAPE

VR

bit No.

I

LLLLLL LLLLLH

543210

gain

increase

LLLLHL LLLLHH

HHHHLH HHHHHL HHHHHH

decrese

mute

I

VR

RP

L

I

5 INPUT H DAC 5

SELECT 2 L

6 REC/PB H PB mode selection R/L SELECT H Rch register selection

L REC mode selection L Lch register selection

7REGISTER

SELECT

H Control register selection REGISTER

SELECT

L Volume register selection

Note: TAPE I: Normal tape, TAPE II: Chrome tape, TAPE IV: Metal tape

Rev.4, Jun. 1997, page 17 of 57

HA12155NT/HA12157NT

Input Block Diagram and Lev e l Diagram

RPI PBI

IA OUT

–3 dB

MPX Filter

NR lN

PB - OUT

HA12155 580 mVrms (–2.5 dBs)

VRI

47 mVrms (–24.3 dBs)

VRI

33 mVrms (–27.4 dBs)

43 mVrms

(–25.2 dBs)

Elect-

rical

VR

30 mVrms

(–28.2 dBs)

Elect-

rical

VR

RPI PBI

43 mVrms

(–25.2 dBs)

Input

Amp

b) REC mode

30 mVrms

(–28.2 dBs)

Input

Amp

IA OUT

426 mVrms

(–5.2 dBs)

MPX ON

300 mVrms

(–8.2 dBs)

MA

HA12157 775 mVrms (0 dBs)

MPX OFF

– 3 dB

The each level shown above is typical value when offering Dolby level to test point pin (NR IN) with the gain of electrical volume is under the condition of max.

MPX Filter

300 mVrms

(–8.2 dBs)

NR lN

PB - OUT

HA12157 775 mVrms (0 dBs)

MA

NR circuit

NR

circuit

HA12155 580 mVrms (–2.5 dBs)

NR

circuit

Rev.4, Jun. 1997, page 18 of 57

The each level shown above is typical value when

a) PB mode

offering Dolby level to test point pin (IA OUT) with the gain of electrical volume is under the condition of max.

Figure 4 Input Block Diagram