HIT HA12207NT Datasheet

HA12207NT

Audio Signal Processor for Cassette Deck

ADE-207-197B (Z)

3rd Edition Jun. 1999

Description

HA12207NT is silicon monolithic bipolar IC providing PB equalizer, REC equalizer system and each electronic control switch in one chip.

Functions

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

•Each electronic control switch to change REC/PB etc.

•REC MUTE

•REC head return switch

Features

•REC equalizer is very small number of external parts, built-in 2 types of frequency characteristics.

•PB equalizer circuit built-in.

•REC /PB of high speed mode are possible with TYPE 1(Normal tape).

•Controllable from direct micro-computer output.

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

•As the pins arrangement resembles HA12185NT, it can design the board that is replaced with HA12185NT.

HA12207NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.6V, 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

							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				Reference
		V’ = VCC	/ 2	+ –		VCC
				PB-IN
					10k
				V		V'
					10k
						GND
8	PB-IN A (L)	V = Vref			VCC	PB A deck input

V

9	PB-IN A (R)

Rev.3, Jun. 1999, page 2 of 27

HA12207NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.6V, Ta = 25°C, No signal, The value in the table show typical value.)

Pin No.	Pin Name	Note	Equivalent Circuit	Pin Description
10	PB-NF (L)	PB-IN = Vref	VCC	PB EQ feed back
			PB-IN
			330k
			180
			7
11	PB-NF (R)
12	PB-EQ (L)	PBOUT = Vref		NAB output
			PBOUT
			GND
13	PB-EQ (R)
20	REC IN (R)	V = Vref	VCC	REC-EQ input
			V
			100k
			Vref 7
21	REC IN (L)
14	PBOUT (R)	V = Vref	VCC	PB output

GND

15	PBOUT (L)

Rev.3, Jun. 1999, page 3 of 27

HA12207NT

Pin Description, Equivalent Circuit (VCC = 10.5V, Vref = 5.6V, Ta = 25°C, No signal, The value in the table show typical value.)

Pin No.	Pin Name	Note	Equivalent Circuit							Pin Description
16	A/B	I = 20 A	I					VCC		Mode control input

22k

100k

GND

17HSP

18MUTE

19	IREF	V = 1.9V		Equalizer
				reference current
				input

V

22	GND	GND pin

Rev.3, Jun. 1999, page 4 of 27

HA12207NT

Block Diagram

CC	GND									: Ω : F
V
										R C
										Unit
						0.01µ
						0.01µ
		)	PB-EQ	12			PB-NF	11
		R				120µ		)
		(			60µ
								R
								(
		)	PB-EQ	13			PB-NF	10
		L				+ –
		(						)
								L
								(
	R	PB-OUT		14		A	IN	9
)								)
	(
					R-ch	B	PB-	R
								(
				15				A
PB-OUT(L)							IN	8
							-	)
							PB	L
								(
								A
		/B		16				VREF		470µ
								7
										+
		HSP		17		L-ch	PB-IN	6
								)
								R
								(
								B
				18			IN	5
							-	)
							PB	L
								(
					12dB			B
		IREF		19		REC-EQ	REC-RETURN	4
				20		R-ch		3
	REC-IN(R)						REC-OUT(R)		5.6k	Bias
	REC-IN(L)			21		L-ch	REC-OUT(L)	2	5.6k
				22	GND		CC	1
							V
								Rev.3, Jun. 1999, page 5 of 27

HA12207NT

Parallel Data Format

Pin No.	Pin Name	L	H
17	HSP	Normal *	Hi speed
16	A/B	Ain active *	Bin active
		Return SW ON *	Return SW OFF
		REC OUT active *	REC OUT HIZ
18	MUTE	MUTE ON *	MUTE OFF
Note: Unforced pin state

Rev.3, Jun. 1999, page 6 of 27

HA12207NT

Functional Description

Power Supply Range

HA12207NT is designed to operate on single supply, shown by table 1.

Table 1	Supply Voltage
Item		Power Supply Range
Single Supply		9.5V to 15.0V

Reference Voltage

As AC reference (Vref) of this IC has not a current drivability, Vref fluctuates by A/B switching of PB-EQ. Provided it causes you anxiety, please supply 7 pin with approximate 1/2 VCC voltage.

For example, a suitable circuit is shown by figure 1.

This IC has a capacitor charger for the Vref, indicated to the pin interface circuit figure.

VCC

1

Lch PB-EQ Reference voltage

Lch REC-EQ Reference voltage 470Ω

Rch REC-EQ Reference voltage

Rch PB-EQ Reference voltage

22		7
	GND	Vref
		+
		470µ F

Figure 1 Reference Voltage Circuit

Rev.3, Jun. 1999, page 7 of 27

HA12207NT

Operating Mode Control

HA12207NT provides fully electronic switching circuits. And each operating mode control is controlled by parallel data (DC voltage).

Table 2 shows the control voltage of each control input pin.

Table 2	Control Voltage (Vth)
Pin No.	Lo	Hi	Unit	Test Condition
16, 17	0.0 to 1.0	4.0 to VCC	V	Input Pin				Measure
								V
18	0.0 to 3.0	4.0 to VCC	V
Note: 1. Each pin is pulled down with 100kΩ			internal resistor. 16 to 18 pins are low-level when each pin is
	open.

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

Block Diagram

Figure 2 shows the block diagram.

As this IC is built-in REC return switch, the configuration system can be simple system using a few external component and the REC/PB head.

As this IC adopted Hi-z SW of REC-EQ output and the input mute system, it realizes REC mute attenuation and pop-noise reduction securing in REC mute.

About these logics, please look at the Parallel Data Format.

B head

A head

Vref

RECOUT		–		REC IN
				21
2			REC - EQ
	Hi-Z SW	+
4
	RETURN SW
5	B			PBOUT
PB IN(B)
		+
				15
	A	–
8
PB IN(A)
7
	10		13	Normal Speed
				PB - A

Figure 2 Block Diagram (Lch)

Rev.3, Jun. 1999, page 8 of 27

HA12207NT

Level Block Diagram

The gain establishment of PB-EQ considers PB output level {(external AMP+PB AMP)=300mV(Dolby Level)} like figure 3 as the target.

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

The level diagram of 1kHz is shown figure 4. (Normal speed)

Similarly to PB, it consider Dolby level as a standard. And R1 needs the value more than 5.6kΩ .

Because mode establishment resistances are built-in, REC-EQ frequency characteristics are respectively fixed value.

In case the change of the frequency characteristics are necessary, please inquire the responsible agent because the adjustment of resistors is necessary.

300mV (Dolby level)

HA12134A

63.6mV

0.6mV

40.5dB	20dB
PB-EQ	Dolby IC

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

Rev.3, Jun. 1999, page 9 of 27