HIT HA12219NT Datasheet

HA12219NT

Audio Signal Processor for Cassette Deck

ADE-207-258A

2nd Edition July 1998

Description

HA12219NT 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 are possible with TYPE I/II.

•Controllable from direct micro-computer output.

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

HA12219NT

Pin Description, Equivalent Circuit (VCC = 12 V, Vref = 5.6 V, 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

REC-OUT(L)

V = Vref

VCC

REC-EQ output

GND

3	REC-OUT(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
			10 k
			V	V,
			10 k
				GND
8	PB-IN A(L)	V = Vref	VCC		PB A deck input

PB-NF

9	PB-IN A(R)

Rev.2, Jul. 1998, page 2 of 29

HA12219NT

Pin Description, Equivalent Circuit (VCC = 12 V, Vref = 5.6 V, Ta = 25°C, No signal, The value in the table show typical value.) (cont)

Pin No.

Pin Name

Note

Equivalent Circuit

Pin Description

12

PB-NF(R)

PB-IN = Vref

VCC

PB-EQ feed back

PB-IN

17

PB-NF(L)

13

PB-EQ(R)

PB-OUT = Vref

NAB output

PB-OUT

GND

16

PB-EQ(L)

21

REC-IN(R)

V = Vref

VCC

REC-EQ input

100 k

Vref 7

22

REC-IN(L)

14

PB-OUT(R)

V = Vref

VCC

PB output

									GND
15	PB-OUT(L)
18	A 120/70	I = 20 A							VCC	Mode control input
				I

22k

100 k

GND

19A/B

20B I/II

Rev.2, Jul. 1998, page 3 of 29

HA12219NT

Pin Description, Equivalent Circuit (VCC = 12 V, Vref = 5.6 V, Ta = 25°C, No signal, The value in the table show typical value.) (cont)

Pin No.	Pin Name	Note	Equivalent Circuit			Pin Description
10	IREF	V = 1.2 V				Equalizer
						reference current
						input

11	GND	GND pin

Rev.2, Jul. 1998, page 4 of 29

HA12219NT

Block Diagram

R : Ω C : F

12

A

GND

11

Unit

B

+ −

13

120/70

IREF

10

14

PB-OUT(R)

PB-INA(R)

9

15

PB-OUT(L)

PB-INA(L)

8

16

120/70

VREF

7

+

− +

17

6

PB-INB(R)

A

/70

A

18

B

SW

5

PB-INB(L)

A/

19

Return

4

REC-RETURN

/II

B

20

REC-OUT(R)

3

+

+

21

REC-IN(R)

REC-EQ(R)

REC-OUT(L)

2

+

+

22

)

L

REC-EQ

CC

V

1

REC-IN(L)

(

CC

V

Rev.2, Jul. 1998, page 5 of 29

HA12219NT

Parallel Data Format

Pin No.	Pin Name	Lo	Mid	Hi
18	A 120/70	*	—	*
19	A/B	B	A	A
		Return SW OFF	Return SW ON	Return SW ON
		REC Mute ON	REC Mute ON	REC Mute OFF
20	B I/II	REC-EQ *	—	REC-EQ *
		TYPE I		TYPE II
Note: PB-EQ 120/70 logic
		A/B
A 120/70	B I/II
		Lo	Mid	Hi
Lo	Lo	120	120	120
Lo	Hi	70	120	120
Hi	Lo	120	70	70
Hi	Hi	70	70	70

Rev.2, Jul. 1998, page 6 of 29

HA12219NT

Functional Description

Power Supply Range

HA12219NT is designed to operate on single supply, shown by table 1.

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

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
470 Ω		Lch REC-EQ Reference voltage
		Rch REC-EQ Reference voltage
11 GND	7 Vref	Rch PB-EQ Reference voltage
	+470	µ F

Figure 1 Reference Voltage Circuit

Rev.2, Jul. 1998, page 7 of 29

HA12219NT

Operating Mode Control

HA12219NT 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

Mid

Hi

Unit

Test Condition

18, 20

0.0 to 0.5

—

2.4 to V CC

V

Input Pin Measure

V

19

0.0 to 0.5

1.2 to 1.8

2.4 to VCC

V

Note: 1. Each pin is pulled down with 100 kΩ

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 –0.2 V)

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.

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

	REC-OUT(L)			REC - EQ	REC-IN
		2			22
		4
B head			Return SW
		5	B
	PB-IN B(L)				PB-OUT
				+
					15
		8	A	−
A head	PB-IN A(L)
		7
			10	13	Normal Speed
					PB-A
Vref

Figure 2 Block Diagram (Lch)

Rev.2, Jul. 1998, page 8 of 29

HA12219NT

Level Block Diagram

The gain establishment of PB-EQ considers PB output level

{(external AMP+PB AMP <HA12136A>) = 580 mV (Dolby Level)} like figure 3 as the target.

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

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

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.

580 mV

(Dolby level)

HA12136A

63.6 mV

0.6 mV

40.5 dB	26 dB
PB-EQ	Dolby IC

Figure 3 PB Level Block Diagram (120 s, 1 kHz)

Rev.2, Jul. 1998, page 9 of 29