HIT HA12157NT, HA12155NT Datasheet

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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 volume 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 Corporation 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

							REC		LM
GNDVRI	CNT RPI	PBI	IA OUT				OUT(L)	LM	OUT(L)	GND EQ
				(L)		PB OUT		IN(L)
					NRIN Vref					(2) OUT(L)
DATA CLK STB (1) (L)	(L) (L) BIAS	(L) DGND
						(L)

											M (L)	(L)											EQ
											P												EQ
											X												IN(L)			NN NC NM HN HC
																										NN NC NM HN HC						HM
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	HM

Shift	6BIT		RECT
register	6BIT		Dolby B/C NR
Latch	DAC	IA	+
		IA	+	REC
			LMA	REC
			LMA	EQ
			–	EQ
Decoder	E VOL
SW	E VOL		–	REC
SW			LMA	REC
			LMA	EQ
		IA	+	EQ
			+
BIAS	6BIT		Dolby B/C NR	EQ-Controller
BIAS	6BIT		Dolby B/C NR	EQ-Controller
	DAC		RECT

	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		29	30	31	32
Rev																												FM	fQ		f/Q	GH	GL	GP
Rev												P
												M
.												X NRIN												EQ
4,												X NRIN												EQ
4,	NR	C/B	MPX VCC VRI			CNT RPI REF PBI INJ					IA OUT (R)			PBOUT										IN(R)IREF EQ
.Jun	NR	C/B	MPX VCC VRI			CNT RPI REF PBI INJ					IA OUT (R)		Vref	PBOUT							LM			IN(R)IREF EQ
	ON/OFF		ON/OFF		(R)	(R)	(R)		(R)		(R)		Vref	(R)						REC	LM					OUT(R)
											(R)		(R)							REC	IN(R)		LM
57 of 3 page 1997,																			OUT(R)				OUT(R)
																							OUT(R)

Diagram Block

HA12155NT/HA12157NT

Absolute Maximum Ratings

Item	Symbol	Ratings	Unit
Supply voltage	VCC	16	V
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		IQ		—	29.0	37.0	mA		no signal

Input amp gain		GVIA RPI		18.5	20.0	21.5		dB		Vin = 0 dB, f = 1 kHz

		GVIA PBI		18.5	20.0	21.5

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%,		*1
										VCC = 12 V

Signal to noise ratio		S/N		60.0	63.0	—	dB		Rg = 5.1 k Ω , 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	VcH		3.5	—	5.3	V		MPX ON/OFF, NR
voltage	Lo level	VcL		–0.2	—	1.0			ON/OFF C-NR/B-NR
Serial data	Hi level	VsH		3.5	—	5.3	V		CLK, DATA, STB
voltage	Lo level	VsL		–0.2	—	1.0
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		∆ GV		–1.0	0.0	1.0		dB		Vin = 0 dB, f = 1 kHz

Volume gain		GVVR (MAX)		17.5	19.3	21.5		dB		Vin = 100 mVrms, f =1 kHz
		GVVR (MIN)		—	—	–55.0		Vin = 3 Vrms, f = 1 kHz

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	GVVR (MUT)	—	—	–80.0	dB		Vin = 3 Vrms, f = 1 kHz
Max-input level to volume	Vin max (VR)	11.0	12.6	—	dBs		f = 1 kHz, THD = 1%,
								VCC = 12 V

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

Volume THD	THD (VR)	—	0.04	0.3	%		Vin = 100 mVrms, f = 1
								kHz

Equalizer gain	GV EQ (500)	13.0	15.0	17.0		dB		Vin = 77.5 mVrms,
								f = 500 Hz

	GV EQ (1K)	13.0	15.0	17.0				Vin = 77.5 mVrms,
								f = 1 kHz

	GV EQ (5K)	14.5	16.5	18.5				Vin = 77.5 mVrms,
								f = 5 kHz

	GV EQ (10K)	18.5	20.5	22.5				Vin = 77.5 mVrms,
								f = 10 kHz

	GV EQ (20K)	29.5	32.0	34.5				Vin = 77.5 mVrms,
								f = 20 kHz

Equalizer maximum input	Vin max (EQ)	–8.0	–7.0	—	dBs		f = 1 kHz, THD = 1%,		*1
								VCC = 12 V

Equalizer S/N	S/N (EQ)	57.0	62.0	—	dB		Rg = 5.1 k Ω , A-WTG

Equalizer THD	THD (EQ)	—	0.2	0.5	%		Vin = 77.5 mVrms,
								f = 1 kHz

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,
								–20 dB range

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

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

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

DC VM 2

SW16

OFF

SW14

Mode

REC

controller

SW15

AC VM 2

REC

R72

SW12

16 k

SW4

SW8

R25

R22

10 k

TP3

TP4

SW10

7.5 k

C30

R67

R66

OFF

2.2

R20 R71

R19

R28

SW25

C61

C62

5.1 k

10 k Degital

C28

C29

R21

C60

20 k

10p

C33

GND ON

2200p 2200p

C27

C26

C25

C24

C23

C21

C20

10p

0.47

10 k

R29

R27

R26

R24

R23

2200p

0.1 0.1

0.1

+ 4.7

10k

+ 1

+ 0.47 18 k + 0.47

2.4 k

5.6 k

22 k

560

2.2

+ 0.47

10 k

DATA CLK

STB

GND

VRI

CNT

RPI

BIAS PBI DGND IA OUT NRIN V REF

PBOUT SS1

SS2

CCR

HLS

LLS

REC

GND

(1)

(L)

DET(L)

DET(L)OUT(L) IN(L) DET(L) OUT(L) IN(L)

(2)

OUT(L)

HA12155/7 NT (REC 1 CHIP)

DP-64S

MPX

VRI

CNT RPI

PBI

IA OUT NRIN V REF

PBOUT SS1

SS2

CCR

HLS

LLS

REC

ON/OFFC/B

ON/OFF V CC

(R)

REF

(R)

INJ

(R)

DET(R)

DET(R)OUT(R) IN(R) DET(R) OUT(R)IN(R)

IREF OUT(R) FM

F/Q

C4 +

C5 + C6 + C7

+ C8 +

R10

R11

R13

C12

C13

C14

C15

C18 +

R17

+ C19

R30

R31

R32

R33

R34

R35

2.4 k 5.6 k

560

C16

22 k

0.47

1.2 k

22 k

2.2

0.47

24 k

4.7

2200p

0.1

SW18

SW19 SW20

R36

R37

R38

R39

R40

R41

R68

R69

OFF

0.1

SW24 C11

C10

R14

C17

5.1 k

10 k

20 k

R16

R42

R43

R44

R45

R46

R47

2.2

2200 p 2200 p

OFF ON b c

ON OFF

C32

100 k

100

TP1

TP2

R12

SW9

R15

R18

R48

R49

R50

R51

R52

R53

SW21

SW22

SW23

10 k

7.5 k

SW7

10 k

R54

R55

R56

R57

R58

R59

S3 S2

S3 S2 S3

R70

R60

R61

R62

R63

R64

R65

51k

R75

16 k

100k

51 k

33 k

SW3

AC VM 3

REC

SW11

SW17

SW13

OFF

REC

SW1

Audio SG

AC VM 1

AC VM 4

Distortion

Oscilloscope

Noise meter

Source 1

Source 2

Source 3

analyzer

14 V

5 V

Noise meter

with CCIR/ARM filter

and A–WTG filter

Notes

1: Registor tolerance are ±1 %

2: Capacitor tolerance are ±1 %

3: Unit R:Ω

C:F

Circuit Test	HA12155NT/HA12157NT

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

CN1

STB

PBI (L)

PBOUT (L)

CLK

RECOUT (L)

RPI (L)

LMOUT (L)

DATA

TP3

DGND

R72

EQIN (L)

TP4

16 k

EQOUT (L)

MPX

ON/OFF

C/B

VRI (L)

R25

R22

10 k

ON/OFF

7.5 k

VCC2

C30

R20

R71

(+5 V)

R67

2.2

R19

C22 100 k 51 k

C60

C61

C62

R66

R28

R21

10 k

5.1 k

C28 C29

10p

5.1 k

10 k

20 k

Degital GND

2200 p 2200 p

C27

C26

C25

C23

C33

R29

C24

0.1

C21

C20

R27

R26

R24

R23

0.1

10 k

+ 0.47 +

+ 0.47

18 k+

0.47

2200 p

+ 2.2

0.47

+ 0.47

2.4 k 5.6 k

22 k

560

DATA CLK

STB

GND

VRI

CNT

RPI

BIAS

PBI

DGND IAOUT NRIN

Vref PBOUT SS1

SS2

CCR

HLS

LLS

REC

GND

(1)

(L)

DET (L) DET (L) OUT (L) IN (L)

DET (L) OUT (L)

IN (L)

(2)

OUT (L)

HA12155/7 (REC 1 CHIP)

DP-64S

MPX

VRI

CNT

PRI

PBI

IAOUT NRIN

Vref PBOUT SS1

SS2

CCR

HLS

LLS

REC

ON/OFF C/B ON/OFF VCC

(R)

REF

(R)

INJ

(R)

DET (R) DET (R)OUT (R) IN (R) DET (R)OUT (R) IN (R)

IREF OUT (R)

C4 + C5 + C6 + C7 +

C8 +

R10

R11

R13

C12

C13

C14

C15

C16

C18

C19

R30

R31

R32

R33

R34

R35

0.47

2.4 k

5.6 k

22 k

560

22 k

0.1

2.2

0.1

0.47

R17

4.7

R36

R37

R38

R39

R40

R41

C10

2200 p

R68

R69

R14

C17

5.1 k

10 k

20 k

R42

R43

R44

R45

R46

R47

2200 p

R16

+C11

100 k

VRI (R)

2.2

R15

R18

R48

R49

R50

R51

R52

R53

R12

10 k

7.5 k

R54

R55

R56

R57

R58

R59

10 k

RPI (R)

TP2

R70

R60

R61

R62

R63

R64

R65

R75

51 k

RBI (R)

TP1

16 k EQIN (R)

100 k 51 k

51 k

33 k

EQOUT (R)

CN2

RECOUT (R)

LMOUT (R)

GND

C34

VEE

100

C32

PBOUT (R)

100

VCC1

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

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

R8 = VINJ – VEE – 0.7 (kΩ )

3.6

Circuit Supply Split of Example

HA12155NT/HA12157NT

57of8page1997, .Jun 4,.Rev

(+5 V)

Controller Mode

HA12155NT/HA12157NT

GND

SW1

SW2

SW3

1 M

NR•ON/OFF

100

22 K

JP1

22 k

C1 2.2

N13 IC8

R 17

R 1

TRIGGER

N1 IC6

22 k

PRQ

PR Q

22 k

JP2

C/B

D Q

CLR

MPX•ON/OFF

CLR

D9 IC9

JP3

IC2

PR Q

QA QB Q C QD

SW9

TRIGGER

N5 IC8

D3 IC3

D Q

IC 1

CLR

X'tal OSC

N2 IC8

N3 IC6

N4 IC8

N11 IC8 N12 IC8

MCLK

IC3

R 22

CLR

R 4

STB

QA QB QC QD

510

62.5 kHz SW10

N6 IC6

X'tal

125 kHz

IC5

10 p

1 MHz

120 p

250 kHz

IC5

GND

500 kHz

D Q

R 7

R 8

R 9

R 10

R 11

R 12

R 13

R 14

CLR

VCC (+5 V)

22 k

22 k 22 k

22 k

N7 IC6

N8 IC7

CLK

SW8 SW7 SW6 SW5 SW4 SW3 SW2

SW1

N9 IC7

A B

C D E F G

H CLK CLK

SHIFT

N10 IC7

INHIBITLOAD

Parts No.

Type

3 DATA

IC1

HD74HC221

IC4

IC2

HD74HC74

IC3

HD74HC393

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

IC4

HD74HC165

IC5

HD74HC175

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

IC6

HD74HC00

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

IC7

HD74HC00

IC8

HD74HC04

4: Unit R : Ω , C : F

IC9

HD74HC74

HA12155NT/HA12157NT

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

Pin No.

Terminal

DP-64S

name

Zin

voltage

Equivalent circuit

Description

RPI

100 kΩ

VCC/2

Recording input

9	PBI

56

21	LM IN	HA12155
		---75 kΩ

44		HA12157
		---100 kΩ

24	EQ IN	100 kΩ

41

Play back input

Level meter input

Equalyzer input

5	VRI	100 kΩ	VCC/2			Volume input

60			+0.7 V

4	VCC	—	V CC	—	Power supply
8	REF	—	V CC/2	—	Ripple filter

12	NR IN	—	V CC/2			NR processor input

53
53

15	SS 1	—	V CC/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	—	V CC/2		Current controled

48					resistor output

11	IA OUT	—	V CC/2		Input amp output
54				VCC

		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

DP-64S

name

Zin

voltage

Equivalent circuit

Description

HLS DET

—

2.3 V

Time constant pin for

rectifier

19	LLS DET
46
57	BIAS	—	0.28 V	Dolby NR Reference
				current input
				GND
25	IREF	—	1.2 V	EQ Reference current
				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

DP-64S

name

Zin

voltage

Equivalent circuit

Description

—

EQ Parameter

GND

selector

CNT

5.2 kΩ

VCC/2-

DAC output Volume

VCC / 2

1.5 V to

control input

VCC/2

DAC

out

LMD

—

0.2 V

Time constant Pin for

level meter

LM OUT

GND

LMD

LM OUT —

0.2 V

Level meter output

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

DP-64S

name

Zin

voltage

Equivalent circuit

Description

100 kΩ

—

Mode control input

ON/OFF

						D - GND
						D - GND
					GND

2	C/B

3	MPX
	ON/OFF

62	STB

63	CLK

64	DATA

10	INJ	—	0.7 V	—		Injection current input
						for I2L

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

40	GND	—	0.0 V	—		Ground

61

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.

	52
	VCC
	+
	–
	L channel
	reference
	R channel
8	reference
+	–
+
1 F	+
	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 VTH can be offered by connecting DGND pin to GND pin.

This means that it can be controlled directly by micro processor. 2. Each pins are on pulled down with 100 kΩ internal resistor.

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).

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 VCC 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

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.

CLK	5 V
CLK	0 V
	0 V
DATA	5 V	0	1	2	3	4	5	6	7
	0 V
STB	5 V
	0 V								latch of data
									latch of data

Figure 3 Serial Data Timming Chart

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

HA12155NT/HA12157NT

Table 4 Serial Data Formatting

Bit	Control	Volume register
No.	register

0	TAPE	H			DAC0

	SELECT 1	L	TS1	H	L
			TS2	H	L
			TS2
			H	TAPE IV	TAPE I
			L	TAPE II	TAPE I

1	TAPE	H					DAC1

	SELECT 2	L

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	IS2	IS1	H	L
					H	L

		bit No.
5	4	3	2	1	0	gain
L	L	L	L	L	L	increase
L	L	L	L	L	H
L	L	L	L	H	L
L	L	L	L	H	H

H H H H L H
H H H H L H
H	H	H	H	H	L	decrese
H	H	H	H	H	H	mute

*mute is implemented when all bits are high.

			H	PB I	VR I
			L	RP I	VR 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

7	REGISTER	H	Control register selection			REGISTER L		Volume register selection
	SELECT					SELECT

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 Level Diagram

–3 dB

		IA	MPX	NR	PB - OUT
		IA	MPX	NR
		OUT	Filter	lN	HA12155
	RPI PBI				580 mVrms
					(–2.5 dBs)
	43 mVrms	43 mVrms	426 mVrms	300 mVrms	HA12157
	(–25.2 dBs)	(–25.2 dBs)	(–5.2 dBs)	(–8.2 dBs)	775 mVrms
	(–25.2 dBs)				(0 dBs)
VRI		Input	MPX ON	MA	NR
	Elect-	Amp	MPX OFF	MA	NR
	Elect-	Amp			circuit
	rical				circuit
	rical		– 3 dB
47 mVrms	VR		– 3 dB
47 mVrms
(–24.3 dBs)

The each level shown above is typical value when b) REC mode offering Dolby level to test point pin (NR IN) with

the gain of electrical volume is under the condition of max.

		IA	MPX	NR	PB - OUT
		IA	MPX	NR
		OUT	Filter	lN	HA12155
	RPI PBI				580 mVrms
					(–2.5 dBs)
	30 mVrms	30 mVrms	300 mVrms		HA12157
	(–28.2 dBs)	(–28.2 dBs)	(–8.2 dBs)		775 mVrms
					(0 dBs)
VRI	Elect-	Input		MA	NR
	Elect-	Amp			circuit
	rical
	VR
33 mVrms				NR circuit
(–27.4 dBs)				NR circuit
(–27.4 dBs)

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

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

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