HIT HA12211NT Datasheet

HA12211NT

Audio Signal Processor for Cassette Deck (Deck 1 Chip)

ADE-207-223A (Z)

2nd. Edition June 1997

Description

HA12211NT is silicon monolithic bipolar IC providing REC equalizer system, PB equalizer system and each electronic control switch in one chip.

Functions

•	PB equalizer	×	2 channel
•	REC equalizer	×	2 channel

•Each electronical control switch to change equalizer characteristics

•REC mute

•REC head return switch

Features

•REC equalizer is very small number of external parts.(4 types of frequency characteristics built-in)

•PB equalizer built-in. (A/B input changing system, 4 types of frequency characteristics)

•Independent PB sensitivity for A deck, B deck.

•Normal-speed/high-speed, normal tape/chrome tape switching built-in.

•Controllable from direct micro-computer output.

•Available to reduce substrate-area because of high integration and small external parts.

HA12211NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.25V, Ta = 25°C, No signal, The value in the table show typical value.)

Pin No.	Pin Name	Note	Equivalent Circuit		Pin Description
1	VCC	V = VCC			VCC Pin
2	RECOUT (L)	V = Vref		VCC	REC-EQ output
			V
				GND
3	RECOUT (R)
4	REC-RETURN	V = Vref		VCC	REC Return
		V’ = Vref		I
			V	4 V’
			5 pin, 6 pin
				I
			GND
5	PB-IN B (L)				PB B Deck input
6	PB-IN B (R)
7	VREF	V = Vref		VCC	Reference
		V’ = VCC / 2
			10k
			V	V’
			10k
				GND
8	PB-IN A(L)	V = Vref		VCC	PB A Deck input
				V
9	PB-IN A(R)

Rev.2, Jun. 1997, page 2 of 34

HA12211NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.25V, Ta = 25°C, No signal, The value in the table show typical value.) (cont)

Pin No.	Pin Name	Note	Equivalent Circuit	Pin Description
10	PB-NF (L)	V = Vref	VCC	PB EQ Feed back

			139k
11	PB-NF (R)
12	PB-EQ (L)	V = Vref		NAB Output
				V
			GND
13	PB-EQ (R)
14	PB-Cal A(L)	V = Vref	VCC	Feed back input
				for gain
				adjustment
			10k
		Vref 7	V

15PB-Cal A(R)

16PB-Cal B(R)

17PB-Cal B(L)

26	AUX (R)	V = Vref	VCC	REC-EQ input
			100k
		Vref 7	V

27AUX (L)

28TAPE (R)

29TAPE (L)

Rev.2, Jun. 1997, page 3 of 34

HA12211NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.25V, Ta = 25°C, No signal, The value in the table show typical value.) (cont)

Pin No.	Pin Name	Note	Equivalent Circuit		Pin Description
18	PBOUT (R)	V = Vref		VCC	PB output

GND

19	PBOUT (L)
20	A/B	I = 20 A	I	VCC	Mode control input
20	A/B	I = 20 A		VCC	Mode control input

22k

100k

GND

21HSP

22Acr

23Bcr

24	REC-SEL	I = 20 A	VCC	Mode control input
		V = 2.5V	I
			100k
			V
			50k
			GND
25	IREF	V = 1.2V		Equalizer
				reference current
				input
			V
30	GND			GND Pin

Rev.2, Jun. 1997, page 4 of 34

HA12211NT

Block Diagram

GND

100kB

: Ω : F

: 100kB

Unit R

PB-CAL

)

(

PB-CAL

14 A

)

(

to Dolby

(R)

PB-EQ PB-EQ

)

PB-OUT

(

PB-OUT(L)

+ –

10k

0.022µ

)

(

A/B

22 21 20

PB-IN PB-NF PB-NF

)

0.022µ

470 470

(

from logic

HSP

2.7k 2.26k 1.12k

)

L-ch

R-ch

(

ACr

)

(

9 A

BCr

)

139k

PB-

(

REC-SEL

+ –

7 A

470µ

VREF

-IN

IREF

)

(

AUX(R)

PB-IN

12dB

)

(

REC-EQ

AUX(L)

REC-RETURN

REC

R-ch

TAPE(R)

REC-OUT(R)

5.6k

Bias

TAPE(L)

L-ch

REC-OUT(L)

5.6k

GND

470

Rev.2, Jun. 1997, page 5 of 34

HA12211NT

Parallel Data Format

Pin No.		Pin Name				L			M	H
22		A CrO2			1, 3				—	* 1
23		B CrO2			1, 2, *3				—	* 1, *2
21		HSP				Normal speed *3			—	Hi speed

20		A/B				Ain active 1, 3			—	Bin active * 1

						Return SW ON *3			—	Return SW OFF

						REC OUT active *3			—	REC OUT Hiz

24		REC IN SEL				TAPE			MUTE *3	AUX

Note: 1.	PB-EQ LOGIC
				HSP

				L			H

				A/B

	A CrO2	B CrO2		L	H		L	H

	L	L		120	120		60	60
	L	H		120	70		60	35
	H	L		70	120		35	60
	H	H		70	70		35	35
2. REC-EQ LOGIC
			HSP

	B CrO2		L				H

	L		Normal speed				High speed
			TAPE I				TAPE I

	H		Normal speed				High speed
			TAPE II				TAPE II

3.	Unforced pin state

Rev.2, Jun. 1997, page 6 of 34

HA12211NT

Functional Description

Power Supply Range

This IC is designed to operate on single supply, shown by table 1.

Table 1	Spply Voltage
Item		Power Supply Range

Single Supply		9.5V to 15.0V

Reference Voltage

So little is the current drivability of AC reference (Vref) that the Vref voltage may be altered by A/B switching of PB-EQ.

Provided it causes you anxiety, please use the constant 1/2 VCC voltage circuit, for example, figure 1.

In addition, this IC has a capacitor charger for Vref pin.

VCC

Lch PB-EQ reference voltage

Lch REC-EQ reference voltage 470Ω

Rch REC-EQ reference voltage

Rch PB-EQ reference voltage

30	7
GND	Vref

470µ F

Figure 1 Reference Voltage Circuit

Rev.2, Jun. 1997, page 7 of 34

HA12211NT

Operating Mode Control

This IC provides fully electronic switching circuits. And each operating mode control is controlled by parallel data (DC voltage).

Table 2 Threshold Voltage (Vth)

Pin No.	Lo	Mid	Hi	Unit	Test Condition
20, 21, 22, 23	0.0 to 2.5	—	4.0 to V CC	V	Input Pin	Measure
						V




24	0.0 to 1.0	2.0 to 3.0	4.0 to VCC	V

Note: 1. 20 to 23 pins are pulled down Lo level, and 24 pin is pulled to Mid level by the inside resistor 100kΩ .

2.Over shoot level and under shoot level of input signal must be the standardized. (High: VCC, Low: –0.2V)

Block Diagram

This IC can be constructed for simple system which has little external parts by used the head serving both as Recording and Play back because of REC return SW built-in.

With output Hi-Z of REC-EQ and input muting, this IC is realized not only REC mute attenuation sufficiently but reducing pop noise in REC muting.

Note: Referring to Parallel Data Format also.

B head

A head

							C9
RECOUT		–				29	Tape IN
2		–	REC - EQ				C11
2	Hi-Z SW	+	REC - EQ				C11
R1	Hi-Z SW					27	AUX IN
R1						27	AUX IN
4
	RETURN SW
5	B
PB IN (B)	B						PBOUT
PB IN (B)		+			+
		+			+	19
	A	–			–	19
8	A				–
8
PB IN (A)
Vref	10		12	14	17	R18
Vref						R18
						R9

R7 C7

Normal Speed

Normal Tape

PB - A, Tape IN Select

Figure 2 Block Diagram (Lch)

Rev.2, Jun. 1997, page 8 of 34

HA12211NT

Level Diagram

It is the target that total play back output level is adjusted to 300mV; Dolby level, which the PB system gain in all is included of external amplifier’s (Dolby IC etc.) as follows figure 3. Though A head adjustment is independent of B, select the value of R9, R18 adequately.

Regarding REC-EQ adjust the gain in front of input to this IC.

The level diagram at 1kHz is shown by figure 4.

Note: 1. R1 needs the value more than 1kHz.

2.Depending on the employed REC/PB head and test tape characteristics, there is rare case that the REC-EQ frequency characteristics of this IC can not be matched to the required characteristics because of built-in resistors which determined the REC-EQ parameters in this case, please inquire the responsible agent because of the adjustment of built-in resistors is necessary.

300mV

(Dolby Level)

HA12134A

23.9mV
11.3mV	VR = 11kΩ
100kΩ	VR = 11kΩ

0.6mV

25.5dB 0 to 20.8dB

20dB

–

Dolby IC

100kΩ VR

10kΩ

Figure 3 PB Level Diagram (Normal Speed, Normal Tape, 1kHz)

Rev.2, Jun. 1997, page 9 of 34

HA12211NT
	REC-EQ clip level
1.8V
300mV	263mV
(Dolby Level)
100mV
1kHz	5.6kΩ
	R1

Dolby IC

REC-EQ

Figure 4 REC Level Diagram (Normal Speed, Normal Tape, 1kHz)

Rev.2, Jun. 1997, page 10 of 34

				HA12211NT
Absolute Maximum Rating (Ta = 25°C)
Item	Symbol	Rating	Unit	Note

Max supply voltage	VCC max	16	V

Power dissipation	Pd	500	mW	Ta ≤ 75°C
Operating temperature	Topr	–40 to +75	°C

Storage temperature	Tstg	–55 to +125	°C

Operating voltage	Vopr	9.5 to 15	V

Rev.2, Jun. 1997, page 11 of 34

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