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 |
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Pin Description |
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1 |
VCC |
V = VCC |
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VCC pin |
2 |
RECOUT (L) |
V = Vref |
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VCC |
REC-EQ output |
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GND |
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3 |
RECOUT (R) |
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4 |
REC-RETURN V = Vref |
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VCC REC return |
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V ’= Vref |
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V |
4 |
V’ |
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5 pin, 6 pin |
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I |
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GND |
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5 |
PB-IN B (L) |
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PB B Deck input |
6 |
PB-IN B (R) |
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7 |
VREF |
V = Vref |
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Reference |
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V’ = VCC |
/ 2 |
+ – |
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VCC |
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PB-IN |
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10k |
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V |
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V' |
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10k |
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GND |
8 |
PB-IN A (L) |
V = Vref |
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VCC |
PB A deck input |
V
9 |
PB-IN A (R) |
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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 |
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PB-IN |
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330k |
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180 |
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7 |
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11 |
PB-NF (R) |
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12 |
PB-EQ (L) |
PBOUT = Vref |
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NAB output |
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PBOUT |
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GND |
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13 |
PB-EQ (R) |
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20 |
REC IN (R) |
V = Vref |
VCC |
REC-EQ input |
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V |
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100k |
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Vref 7 |
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21 |
REC IN (L) |
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14 |
PBOUT (R) |
V = Vref |
VCC |
PB output |
GND
15 |
PBOUT (L) |
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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 |
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Pin Description |
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16 |
A/B |
I = 20 A |
I |
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VCC |
Mode control input |
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22k
100k
GND
17HSP
18MUTE
19 |
IREF |
V = 1.9V |
Equalizer |
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reference current |
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input |
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V
22 |
GND |
GND pin |
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Rev.3, Jun. 1999, page 4 of 27
HA12207NT
Block Diagram
CC |
GND |
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: Ω : F |
V |
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R C |
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Unit |
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0.01µ |
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0.01µ |
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) |
PB-EQ |
12 |
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PB-NF |
11 |
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R |
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120µ |
) |
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60µ |
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R |
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PB-EQ |
13 |
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PB-NF |
10 |
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L |
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+ – |
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L |
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R |
PB-OUT |
14 |
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A |
IN |
9 |
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R-ch |
B |
PB- |
R |
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15 |
A |
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PB-OUT(L) |
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IN |
8 |
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- |
) |
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PB |
L |
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A |
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/B |
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16 |
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VREF |
470µ |
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7 |
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+ |
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HSP |
17 |
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L-ch |
PB-IN |
6 |
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) |
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R |
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B |
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18 |
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IN |
5 |
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- |
) |
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PB |
L |
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( |
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12dB |
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B |
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IREF |
19 |
REC-EQ |
REC-RETURN |
4 |
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20 |
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R-ch |
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3 |
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REC-IN(R) |
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REC-OUT(R) |
5.6k |
Bias |
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REC-IN(L) |
21 |
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L-ch |
REC-OUT(L) |
2 |
5.6k |
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22 |
GND |
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CC |
1 |
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V |
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Rev.3, Jun. 1999, page 5 of 27 |
HA12207NT
Parallel Data Format
Pin No. |
Pin Name |
L |
H |
17 |
HSP |
Normal * |
Hi speed |
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16 |
A/B |
Ain active * |
Bin active |
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Return SW ON * |
Return SW OFF |
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REC OUT active * |
REC OUT HIZ |
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18 |
MUTE |
MUTE ON * |
MUTE OFF |
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Note: Unforced pin state |
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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 |
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Power Supply Range |
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Single Supply |
9.5V to 15.0V |
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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 |
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7 |
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GND |
Vref |
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+ |
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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) |
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Pin No. |
Lo |
Hi |
Unit |
Test Condition |
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16, 17 |
0.0 to 1.0 |
4.0 to VCC |
V |
Input Pin |
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Measure |
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V |
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18 |
0.0 to 3.0 |
4.0 to VCC |
V |
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Note: 1. Each pin is pulled down with 100kΩ |
internal resistor. 16 to 18 pins are low-level when each pin is |
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open. |
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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 |
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– |
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REC IN |
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21 |
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2 |
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REC - EQ |
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Hi-Z SW |
+ |
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4 |
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RETURN SW |
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5 |
B |
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PBOUT |
PB IN(B) |
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+ |
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15 |
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A |
– |
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8 |
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PB IN(A) |
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7 |
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10 |
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13 |
Normal Speed |
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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