Document
HA12230NT
Audio Signal Processor for Cassette Deck
ADE-207-322E (Z) 6th Edition Nov. 2000 Description
HA12230NT is silicon monolithic bipolar IC providing PB equalizer, REC equalizer system and each electronic control switch in one chip.
Functions
• PB equalizer • REC equalizer × 2 channel × 2 channel
• MS use Mixing Amp. • Each electronic control switch to change tape type and mute etc. • REC mute • REC head return switch • Line Amp. • Line mute
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
HA12230NT
Pin Description, Equivalent Circuit (VCC = 12 V, Ta = 25°C, No signal, The value in the table show typical value.)
Pin No. 17 16 Pin Name VCC RECOUT(L) Note V = VCC V = VCC/2
VCC
Equivalent Circuit
Pin Description VCC pin REC-EQ output
GND
15 10 1 30
RECOUT(R) MAOUT VREF REC-RETURN V = V’ = VCC/2
VCC
MS Amp. output Reference REC return
V pin 3, pin 29 I GND
, 30 V
29 3 28
BIN(L) BIN(R) AIN(L) V = VCC/2 VCC
PB B deck input
PB A deck input
PB-NF 4 11 AIN(R) MAI V = VCC/2
MAOUT 100 k V 45 k VCC/2 VCC
MS Amp. input
Rev.6, Nov. 2000, page 2 of 32
HA12230NT
Pin Description, Equivalent Circuit (VCC = 12 V, Ta = 25°C, No signal, The value in the table show typical value.) (cont)
Pin No. 23 Pin Name PBOUT(L) Note V = VCC/2 Equivalent Circuit
VCC
Pin Description PB output
V
GND
9 25 7 26
PBOUT(R) EQOUT(L) EQOUT(R) PB-EQ(L) V = VCC/2
VCC
EQ output (120 µ) EQ output (70 µ)
V EQOUT GND
6 13
PB-EQ(R) RECIN(R) V = VCC/2
VCC
REC-EQ input
100 k VCC/2
18 24 8 19
RECIN(L) TAI(L) TAI(R) MUTE I = 20 µA
I VCC
Tape input
Mode control input
22 k 100 k GND
20 21 22
A 120/70 A/B B I/II
Rev.6, Nov. 2000, page 3 of 32
HA12230NT
Pin Description, Equivalent Circuit (VCC = 12 V, Ta = 25°C, No signal, The value in the table show typical value.) (cont)
Pin No. 12 Pin Name IREF Note V = 1.2 V Equivalent Circuit Pin Description Equalizer reference current input
2 27
GND PB-NF(L) PB-IN = Vref
VCC
GND pin PB EQ feed back
PB-IN
180 7
330 k
5 14
PB-NF(R) RIP PBOUT = Vref
VCC
NAB output
V
GND
Rev.6, Nov. 2000, page 4 of 32
Block Diagram
PBOUT(L)
RECIN(L)
RECOUT(L)
+
REC Return
PB-NF(L)
PB-EQ(L)
EQOUT(L)
TAI(L)
+
B I/II
A/B
A120/70
MUTE
30 REC-EQ 120/70
− +
29
28
27
26
25
24
23
22
21
20
19
18
VCC
17
BIN(L)
AIN(L)
A Mute
− +
REC Return
+ −
B LPF +
−
REC Return Mute 120/70
+ −
B
A
+ −
Vref
GND
BIN(R)
1
+
2
3
AIN(R)
4
5
6
7
8
9
10
11
12
MAI
IREF
TAI(R)
PB-NF(R)
PB-EQ(R)
EQOUT(R)
Rev.6, Nov. 2000, page 5 of 32
PBOUT(R)
MAOUT
HA12230NT
RECIN(R)
+
16
REC-EQ 13
+
RIP 14
+
15
+
RECOUT(R)
Unit R : Ω C:F
HA12230NT
Parallel Data Format
Pin No. 19 20 21 Pin Name MUTE A 120/70 A/B Lo MUTE OFF * B Return SW OFF REC Mute ON REC-EQ * TYPE I A/B A 120/70 Low Low High High B I/II Low High Low High Lo 120 µ 70 µ 120 µ 70 µ Mid 120 µ 120 µ 70 µ 70 µ Hi 120 µ 120 µ 70 µ 70 µ Mid — — A Return SW ON REC Mute ON — Hi MUTE ON * A Return SW ON REC Mute OFF REC-EQ * TYPE II
22
B I/II
Note: PB-EQ 120/70 logic
Rev.6, Nov. 2000, page 6 of 32
HA12230NT
Functional Description
Power Supply Voltage Range HA12230NT is designed to operate on single supply, shown by table 1. Table 1
Item Single Supply
Operating Power Supply Voltage
Power Supply Voltage Range 6.5 V to 15.0 V
Reference Voltage 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 block diagram is shown as figure 1.
+ − + − + − + −
17 VCC
Line Amp. block MS mixing Amp. block Lch REC-EQ block Rch REC-EQ block PB-EQ block 1
14 2
+
1 µF
+ −
Figure 1 The Block Diagram of Reference Supply Voltage
Rev.6, Nov. 2000, page 7 of 32
HA12230NT
Operating Mode Control HA12230NT provide fully electronic switching circuits. And each operating mode control is controlled by parallel data (DC voltage). Table 2
Pin No. 19, 20, 22
Threshold Voltage (Vth)
Lo 0.0 to 0.5 Mid — Hi 2.4 to VCC Unit V Test Condition
Input Pin Measure V
21 Note:
0.0 to 0.5
1.2 to 1.8
2.4 to VCC
V
1. Each pins are on pulled down with 100 kΩ internal resistor. Therefore, it will be low-level when each pins are open. 2. Over shoot level and under shoot level of input signal must be the standardized. (High: VCC, Low: –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) 16 2.2 µ 8.2 k
+
REC - EQ
REC-IN(L) 18 0.47 µ 5.1 k
+
30 B head BIN(L) AIN(L) A head Return SW 29 28 .