The HA12226F/HA12227F are silicon monolithic bipolar IC providing Dolby noise reduction system*1,
music sensor system, REC equalizer system and each electronic control switch in one chip.
Note: 1. Dolby is a trademark of Dolby Laboratories Licensing Corporation.
A license from Dolby Laboratories Licensing Co r por ation is required for the use of this IC.
The HA12227F is not built-in Dolby B-NR.
Functions
• Dolby B-NR*2× 2 channel
• REC equalizer× 2 channel
• Music sensor× 1 channel
• Pass amp.× 2 channel
• Each electronic control switch to change REC equalizer, bias, etc.
Note: 2. The HA12227F is not built-in Dolby B-NR.
Features
• REC equalizer is very small number of external parts and have 4 types of frequency characteristics
built-in.
• 2 types of input for PB, 1 type of input for REC.
• 70µ - PB equalizer changing system built-in.
• Dolb y NR*
Unprocessed signal output available from recording out terminals during PB mode.
• Provide stable music sensor system, available to design music sensing time and level.
• Controllable from direct micro-computer output.
• Bias oscillator control switch built-in.
• NR ON / OF F and REC / PB fully electronic control switch ing built-in.
• Normal-speed / high-speed, Normal / Crom and PB equalizer fully electronic control switching built-in.
• Available to reduce substrate-area because of high integration and small external parts.
HA12226F❍❍❍❍❍❍
HA12227F×❍❍❍❍❍
Note: Depending on the employed REC / PB head and test tape characteristics, there is a rare case that
the REC-EQ characteristics of this LSI 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 the adjustment built-in resistor is necessary.
SensorPass Amp.
REC / PB
SelectionALC
Difference of HA12215F and HA12226F/HA12227F
Tape Correspondence
ProductSupply VoltageNORMCROMMETAL
HA12226F/HA12227FSingle supply voltage❍❍×
HA12215FSplit supply voltage❍❍❍
Note: The HA12226F/HA12227F became single power supply for the HA12215F and deleted metal
correspondence. The HA12227F is not built-in Dolby B-NR.
Other characteristic aspects are similar as the HA12215F.
Rev.6, Dec. 2000, page 2 of 86
HA12226F/HA12227F
Pin Description, Equivalent Circuit (VCC = 12 V, A system of single supply voltage,
Ta = 25°C, No Signal, The value in the show typical value.)
LoLoFLATFLAT
LoMid or HiFLAT70 µ
HiLo70 µFLAT
HiMid or Hi70 µ70 µ
“Pin Open”
Lo
1
Lo
2. The HA12226F only.
Rev.6, Dec. 2000, page 9 of 86
HA12226F/HA12227F
Functional Description
Power Supply Range
These ICs are designed to operate on single supply.
Table 1Supply Voltage
ProductPower Supply Range (Single Supply)
HA12226F11.0 V to 15.0 V
HA12227F
Note: The lower limit of supply voltage depends on the line output reference level.
The minimum value of the overload margin is specified as 12 dB by Dolby Laboratories (Dolby IC
HA12226F).
Reference Voltage
The reference voltage are provided for the left channel and the right channel separately. The block diagram
is shown as figure 1.
9.5 V to 15.0 V
V
CC
21
+
−
V
CC
50
GND
49
+
RIP
1µ
+
−
+
−
L channel reference
Music sensor reference
R channel reference
Unit C: F
Figure 1 Reference Voltage
Rev.6, Dec. 2000, page 10 of 86
HA12226F/HA12227F
Operating Mode Control
The HA12226F/HA12227F provide fully electronic switching circuits. And each operating mode control is
controlled by parallel data (DC voltage).
Table 2Control Voltage
Pin No.LoMidHiUnitTest Condition
15, 16, 17, 18, 20,
4
22, 23*
, 25
−0.2 to 1.04.0 to V
CC
V
Input PinMeasure
19, 24−0.2 to 1.02.0 to 3.04.0 to V
CC
Notes: 1. Each pins are on pulled down with 100 kΩ inter nal resi stor.
Therefore, it will be low-level when each pins are open.
But pin 24 is mid-level when it is open.
2. Over shoot level and under shoot level of input signal must be the standardized (High: V
Low: −0.2 V).
3. For reduction of pop noise, connect 1 µF to 22 µF capacitor with mode control pins.
But it is impossible to reduce completely in regard to Line mute, therefore, use external mute at
the same time.
4. Non connection regarding the HA12227F.
Input Block Diagram and Lev e l Diagram
The each level shown above is typical value
when offering PBOUT level to PBOUT pin.
R3
12k
C2
FLAT
(120µ)
70µs
R4
15k
25.5mVrms
200mVrms
AIN
BIN
Note: 1. The HA12227F is not built-in Dolby B-NR.
25.9mVrms
21.3dB
300mVrms
4700pF
MSREF
300mVrms
PB/REC,
PASS=0dB/21.4dB
C1
0.1µF
R1
15k
RIN
PB
REC
PASS
0dB
R2
2.2k
PASS
300mVrms
0.1µF
V
Dolby
B-NR
ALC
C3
REC
PB
PASS/REC,
PB=5.7dB/5.7dB
300mVrms
1
*
,
CC
PBOUT
580mVrms
RECOUT
300mVrms
Figure 2 Input Block Diagram
Rev.6, Dec. 2000, page 11 of 86
HA12226F/HA12227F
PB Equalizer
By switching logical input level of pin 17 (for Ain) and pin 19 (for Bin), you can equalize corresponding to
tape position at play back mode.
G
V
t1 = C2 ⋅ (12k + 15k)
t2 = C2 ⋅ 15k
t1t2
Figure 3 Frequency Characteristic of PB Equalizer
The Sensitivity Adjustment o f Music Sensor
Adjusting MS Amp gain by external resistor , the sensitivity of music sensor can set up.
REP
f
V
CC
D V
CC
PB (L)
−6dB
PB (R)
8.2k
LPF
25kHz
C16
+
MAI
100k
−
+
1000p
MA
OUT
MS AMP
R13
330k
MSIN
50k
Figure 4 Music Sensor Block Diagram
DET
MS
DET
+
C13
0.33µ
MS OUT
GND
R
L
Microcomputer
GND
Rev.6, Dec. 2000, page 12 of 86
HA12226F/HA12227F
The Sensitivity of Music Sensor
A standard level of MS input pin 25.9 mVrms, therefore, the sensitivity of music sensor (S) can request
it, by lower formulas.
A = MS Amp Gain*
B = PB input Gain × (1/2)*
C = Sensed voltage
20log (A × B) = D [dB]
C = 130 [mVrms] (Intenally voltage in a standard)
PB input Gain = 21.3 [dB]
Notes: 1. When there is not a regulation outside.
2. Case of one-sided channel input.
But necessary to consider the same attenuation quantity practically, on account of A(B) h ave made
frequency response.
37.7dB
1
2
S = 20log
S = 14 − D [dB]
G
V
C
25.9 ⋅ A ⋅ B
[dB]
f1 =
f2 = 25k [Hz]
f
f1f2
1
2π⋅ C16 ⋅ 50k
[Hz]
Figure 5 Frequency Characteristic of MSIN
Occasion of the external component of figure 4, f1 is 3.18 kHz.
Time constant of detection
Figure 6(1) generally shows that detection time is in proportion to value of capacitor C13. But, with
Attack*
2
and Recovery*3 the detection time differs exceptionally.
Notes 2. Attack: Non-music to Music
3. Recovery : Music to Non-music
Recovery
Attack
Detection time
C13
(1)(2)(3)
RecoveryRecovery
AttackAttack
Detection time
R13
Detection level
Detection time
Input level
Figure 6 Function Characteristic of MS
Like the figure 6(2), Recovery time is variably possible by value of resistor R13. But Attack time gets
about fixed value. Attack time has dependence by input level. When a large signal is inputted, Attack time
is short tendency.
Rev.6, Dec. 2000, page 13 of 86
HA12226F/HA12227F
Music Sensor Output (MSOUT)
As for internal circuit of music sensor block, music sensor output pin is connected to the collector of
NPN type directly, output level will be “high” when sensing no signal. And output level will be “low”
when sensing signal.
Connection with microcomputer, it is requested to use external pull up resistor (R
Note: Supply voltage of MSOUT pin must be less than V
voltage.
CC
= 10 kΩ to 22 kΩ)
L
The Tolerances of External Components for Dolby NR-Block
(Only the HA12226F)
For Dolby NR precision securing, please use external components shown at figure 7. If leak-current are a
few electrolytic-capacitor, it can be applicable to C5 and C23.
C23
0.1µ±10%
42
DET (L)
HA12226F
DET (R)
C5
0.1µ
±10%
BIAS1
1
2
R5
33k
±2%
Figure 7 Tolerance of External Components
Low-Boost
EQIN
24.6dB
4.8k
4.8k
BOOST
+
C9(C19)
0.47µ
REC EQ
EQOUT
Figure 8 Example of Low Boost Circuit
External components shown figure 8 gives frequency response to take 6 dB boost. And cut off frequency
can request it, by C9 (C19).
Rev.6, Dec. 2000, page 14 of 86
HA12226F/HA12227F
REC Equalizer
The outlines of REC Equalizing frequency characteristics are sh own by figure 9. Those peak level can be
set up by supplying voltage. (0 V to 5 V, GND = 0 V) to pin 10 (GPCAL).
And whole band gain can be set up by supplying voltage (0 V to 5 V, GND = 0 V) to pin 11 (RECCAL).
Both setting up range are ±4.5 dB. In case that you do not need setting up, pin 10, pin 11 should be open
bias.
Note: Depending on the employed REC/PB head and test tape characteristics, there is a rare case that the
REC-EQ characteristics of this LSI can not be matched to the required characteristics because of
built-in resistors which determined the REC-EQ parameters in this care, please inquire the
responsible agent because of the adjustment of built-in resistor is necessary.
RECCAL
GPCAL
Gain (dB)
Frequency (Hz)
Figure 9 Frequency Characteristics of REC Equalizer
Bias Switch
The HA12215F built-in DC voltage generato r for bias oscillator and its bias switches.
External resistor R20, R21 which corresponded with tape positions and bias out voltage are relater with
below.
.
Vbias = × (VCC − 0.7) [V]
.
(R20 or R21) + R22
R22
Bias switch follows to a logic of pin 19 (B / Nor m / Crom).
Note: A current that flows at bias out pin, please use it less than 5 mA.
Rev.6, Dec. 2000, page 15 of 86
HA12226F/HA12227F
BIAS (N)
Pin 33
BIAS (C)
Pin 32
R21
R20
Vbias
R22
Figure 10 External Components of Bias Block
Automatic Level Control
ALC is the input decay rate variable system. It has internal variable resistors of pin 55 (pin 44) by
RECOUT signal that is inputted to p in 9 (pin 34 ) .
The operation is similitude to MS, detected by pin 13.
The signal input pin is pin 56 (pin 43). Resistor R1, R2 and capacitor C2, external components, for the
input circuit are commended as figure 12. There are requested to use value of the block diagram figure for
performance maintenance of S/N, T.H.D. etc.
Figure 11 shows the relation with R1 front RIN point and ROUT.
ALC operation level acts for the center of +4.5 dB at tape position TYPE I and the center of +2.5 dB at tape
position TYPE II, to standard level (300 mVrms).
Then, adopted maximum value circuit, ALC is operated by a large channel of a signal.
ALC ON/OFF can switch it by pin 15. Please do ALC ON, after it does for one time ALC OFF inevitably,
for ALC time to start usefully (when switching PB → PASS, when switching PB → PASS), in order to
reset ALC circuit.
TYPE I
4.5dB
RIN
300mV
ROUT
TYPE II
2.5dB
Figure 11 ALC Operation Level
Rev.6, Dec. 2000, page 16 of 86
HA12226F/HA12227F
R1
15k
RINROUT
25.5mV21.4dB
C2
0.1µ
R2
2.2k
56
55
ALC
ALC
8OutputInput
9
13
300mV
C4
ALCIN
ALCDET
R12
C12
V
+
CC
Figure 12 ALC Block Diagram
ALC Operation Level Necessary
ALC operation level is variable to pin 12 bias (ALC-CAL: 0 to 5 V), and its range is ±4.0 dB.
Unnecessary, pin 12 is unforced.
ALC-CAL = 5V
ALC-CAL = 0V
ROUT
RIN
Figure 13 ALC-CAL Characteristics
About a Test Pin
(Pin 2)
The HA12227F does for testing exclusive terminal for pin 2.
In mount circuit, this terminal is open or connected to GND with a resistor of 33 kΩ.
Rev.6, Dec. 2000, page 17 of 86
HA12226F/HA12227F
Absolute Maximum Ratings
ItemSymbolRatingUnitNote
Max supply voltageV
Power dissipationPd625mWTa ≤ 75°C
Operating temperatureTopr−40 to +75°C
Storage temperatureTstg−55 to +125°C