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KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
PLAYBACK / RECORD PRE AMPLIFIER FOR DOUBLE DECK
30-SDIP-400 KA22296 is a monolithic intergrated circuit consisting of a dual input playback amplifier, two channel recording amplifier, 3 outside input selecting switch, and MIC Amp. Due to KA22296 possessing MIC input mixing function, it is practical to apply to systems like CD and radio cassette set.
ORDERING INFORMATION
Device KA22296 Package 30-SDIP-400 Operating Temperature -25C ~ +75C
FEATURES
* * * * * * * *
Dual input two - channel playback amplifier. Recording / Playback function Tape dubbing function NAB EQ ( 60us) for High speed recording function Allowing 3 ( Line 1, Line 2 and AUX ) outside inputs MIC function ( Independent and mixture ) ALC function Operating voltage ( 4V ~ 10V ) : recommended voltage 6 ~ 9 Volt 30 SDIP
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
BLOCK DIAGRAM
CH1-MONOTOR output
CH2-MONITOR utput
CH1-PLAY output
CH2-PLAY output
CH1-REC output
CH2-REC output
CH1-PLAY NF
CH2-PLAY NF
CH1-REC NF
30
29
28
27
26
25
24
23
22 LEVEL DET
21
20
20KO REC
X2
+ AMP-
REC + AMP-
20KO 1KO
1KO
CH2-REC NF 19
ALC R/R
L1 switch L0 switch
X2
CCA
CCA 18 20KO
INV + AMP -
20KO
3.3KO 1.8KO 3.3KO 1.8KO INV + AMP -
20KO 20KO
SWITCH CONTROL
17
MIC swith
16 A/B switch 20KO 15 R/P switch
20KO
NAB + AMP NAB + AMP -
INPUT SELECTOR Voltage Regulator
INPUT SELECTOR
INV + AMP -
20KO
2KO 8 CH1-LINE1 input 9 CH1-LINE2 input 10 CH1-AUX input 11 12 13 CH2-LINE2 Input CH2-LINE1 input CH2-AUX input 14
1
2
3
4
5
6
7
CH1-A input
CH1-B input
CH2-B input
CH2-A input
ABSOLUTE MAXIMUM RATING ( Ta = 25 C)
Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC PD T OPR T STG Value 12 300 -25 ~ +75 -55 ~ +125 Unit V mW C C
Mic input
VREF
GND
VCC
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
ELECTRICAL CHARACTERISTICS (VCC = 6V, Ta = 25C, f = 1Khz unless otherwise specified) Characteristic Quiescent Circuit Current Reference Bias Voltage Swtich Control Voltage A/B Pin16 MIC Pin17 R/P Pin 15 Symbol ICC Vref VSW1 VSW1 VSW1 VSW1 VSW1 VSW1 VSW1 VSW1 L0, L1 Pin 18 / Pin 19 Voltage Gain Max Output Line/ AUX Mode Output Noise Voltage Play Hormonic Distortion back Crosstalk CT1 VSW1 VSW1 GV1 Vom1 Vno1 THD1 Play REC High speed REC A - deck B - deck Mic off Mic only Mic Mix Low High VO = 0.5Vrms THD = 1% Rg = 600, BW = 20-20KHz VO = 0.5Vrms BW = 20-20KHz VO = 0.5Vrms BW = 20-20KHz Ripple Rejection Voltage Gain Max Output R e c o r d Output Noise Voltage ALC Ouptut Hormonic Distortion RR1 GV2 Vom2 Vno2 VA1 THD2 ripple = 0.1Vrms/120Hz VO = 0.5Vrms THD = 1% Rg = 600BW = 20-20KHz Vin = 0.5Vrms VO = 0.5Vrms BW = 20-20KHz Crosstalk CT2 VO = 0.5Vrms BW = 400-20KHz Ripple Rejection RR2 ripple = 0.1V/120Hz -30 dB -65 dB 25 0.9 0.6 -55 27 1.2 500u 0.75 0.3 29 750u 0.9 1.0 dB dB Vrms Vrms Vrms % -65 dB Test Condition A test mode, VCC = 4V Min 7 1.7 Below 0.4V Open or 1.3V-1.9V Above 3V Open or Below 0.5V Above 2V Below 0.4V Open or 1.3V-1.9V Above 3V 0.6--0.8V Above 2V 4 0.75 5.7 1 35u 0.2 8 100u 0.5 dB Vrms Vrms % Typ 12.5 2.1 Max 20 2.4 Unit mA V
KA22296
Characteristic
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
Symbol GV3 Vom3 Vni1 THD3 Test Condition VO = 0.5Vrms THD = 1% Rg = 600, BW = 20-20KHz VO = 0.5Vrms BW = 20-20KHz RR3 GV4 Vom4 Vni2 VA2 THD4 ripple = 0.1V/120Hz VO = 0.5Vrms THD = 1% Rg = 600, BW = 20-20KHz Vin = 0.05Vrms VO = 0.5Vrms BW = 20-20KHz Ripple Rejection Voltage Gain RR4 GV5 ripple = 0.1V/120Hz VO = 0.5Vrms, Normal, 1KHz VO = 0.5Vrms, High, 1KHz Max Output Input Noise Voltage Vom5 Vni3 THD5 THD = 1% Rg = 600, BW = 20-20KHz VO = 0.5Vrms BW = 20-20KHz CT3 VO = 0.5Vrms BW = 20-20KHz Ripple Rejection Voltage Gain Max Output Input Noise Voltage RR5 GV6 Vom6 Vni4 VA3 THD6 ripple = 0.1V/120Hz VO = 0.5Vrms, Normal, 1KHz THD = 1% Rg = 600, BW = 20-20KHz Vin = 5mVrms VO = 0.5Vrms BW = 20-20KHz Crosstalk CT4 VO = 0.5Vrms BW = 20-20KHz Ripple Rejection RR6 ripple = 0.1V/120Hz -17 dB -60 dB 62 0.9 0.6 -36 64 1 2.0m 0.75 0.3 66 3.0m 0.9 1.0 dB dB Vrms Vrms Vrms % -65 dB 40.1 38.6 0.75 -25 42.1 40.6 1 240u 0.3 44.4 42.6 350u 0.5 dB dB dB Vrms Vrms % 45 0.9 0.6 -45 47 1.2 0.8m 0.75 0.3 49 1.2m 0.9 1.0 dB dB Vrms Vrms Vrms % Min 23.6 0.75 Typ 25.6 1 60u 0.3 Max 27.6 150u 0.5 Unit dB Vrms Vrms %
Voltage Gain Max Output Line/ AUX Mode Input Noise Voltage Playba Harmonic Distortion ck Ripple Rejection Voltage Gain Mak Output Recor Input Noise Voltage d ALC Output Harmonic Distortion
Playba Harmonic Distortion ck Tape Mode Crosstalk
Recor ALC Output d Harmonic Distortion
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
PIN DESCRIPTION
No. 1/4 Symbol A - input I/O Playback Amplifier A - input Internal Equivalance Circuit
VCC
1/4 27/30
2/3
B - input
Playback Amplifier B-input
GND
VCC
2/3 27/30
5 6
GND VREF
GND Reference Voltage
-
GND
VCC
6
GND
7 8/11
VCC LINE1 input
Supply Voltage LINE 1 External Input Terminal LINE2 External Input Terminal AUX External Input Terminal
30U 30U 30U
VCC
9/12
LINE2 input
10/13 9/12 8/11
10/3
AUX input
GND
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
No. 14
Symbol MIC input
I/O Input Terminal
Internal Equivalance Circuit
VCC
30U
20U
14
2U
GND
15
R/P switch
Selecting Terminal
VCC
16
A/B switch
A, B Playback Input Selecting Terminal MIC Input Selecting Terminal
15 17
2 0U
17
MIC switch
1 2U
1 2 U GND VCC
18
L0 switch EXTERNAL LINE
16 18 19 2 0U
19
L1 switch
Selecting Terminal
1 0 U 1 2 U GND
20/24
REC NF
REC Amplifier, negative terminal
VCC
20U
100
21/23
REC output
REC Amplifier Output Terminal
20/24
1U
21/23
GND
KA22296
No. 22 Symbol ALC R/R
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
I/O Ripple Rejection Termianl of ALC Detecting Output
22
Internal Equivalance Circuit
VCC
GND
25/26
Monitor output
Monitor Output Terminal
VCC
20U 20U
100
25/26
GND
27/30
PB NF
Playback Amplifier
VCC
2/3 27/30
28/29
PB output
Playback Amplifier Output Terminal for NAB EQ
GND
VCC
int
3.3U 1.8U
28/29
GND
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
APPLICATION INFORMATION
1. SWITCH INPUT CONDITION Tabel 1. Pin Function Pin 15 REC/PB switch Pin 16 A/B deck switch Pin 17 Mic switch A deck enable Mic off Mic only LOW Play only Open Record only B deck enable Mic mixing High High speed record Remark
* NAB automatically alters to High
EQ. within ( pin 15 = high ) high speed rec. mode.
*Due to external RC time constant,
it is possible to delay the time of switching.
*It is prohibited to mic input into the
( pin 15 = high ) high speed rec. mode.
Talbe 2. Function Condition Line 1 Line 2 Aux Tape Pin 18 Open High High Open Pin 19 High Open High Open In Mic only mode ( pin 17 = open ), all of ( line 1, line 2, AUX, Tape function ) will be somewhat disabled. Refer to note 3 open condition. High Remark
* According to each mode, function selection basically moved due to the conditions of above table 1,2 * Each function Pins possess characteristical representation of functions not in movement, in respect to its reprenting functions. * By the virtue of each pin's combinations changing frequency, it is wise to set up or plan the circuit
according to above table 1,2 input conditions.
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
2. DESCRIPTION OF SWITCH FUNCTION
2 - 1. Controlling the selection switch of pin 15 play / record Pin 15 is not constructed with logic from inside, however it is constructed by controlling 3 level switches caused by external voltage input. As soon as the power is on, it really doesn't matter if the attach switch is in play ( low mode ). Nevertheless is open ( record mode), it will turn to record stage and depending on it, the ALC circuit will function. After and at the incident of source of electric power being approved, all of the circuits will eventuate unstable and results in tendency not known. Sometime in the begining, it is necessary to find a method to stop ALC movement for a set period of time, and is developed through using original switch period.
100uA
Control Voltage
47uF
15
12U
Immediately after the approval of source of electric power, through 100UA's current source with capacitor and resistance in the Pin 15, the Pin 15's current gradually increased. Until it reaches the setted voltage level, the record state can not be accomodated. While under this process, the circuit in record part will not receive any inputs, and by disc harging the generated increase voltage of ALC P/R, turn it into initiation.
Fig 2 - 1
In the section of high speed recording, 3.5 Volts of control voltage must be inflicted. But under this condition, it is wise to operate at high speed recording after delaying the time by connecting the resistance with the outside electrical series or just approval it first and apply the procedure next.
Low
Open
High
0.5V
0.9V
2.1V
2.6V
switch input control
Note 1 : 3 steps of input switch ( Pin 15, 17 ) controlled voltage. In the 3 stepped switch recording system, play deciding Pin 15 exist and Mic mode deciding function P17 also exists as well. Voltage in the high mode is more than enough. Low mode's voltage will be achieved if the voltage goes below 0.3 V. The open mode does not deal with any other voltage so just open it.
0 ~ 0.3V
open state
3.5V ~ VCC
Fig 2 - 3
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
2-2 Pin 16 A/B deck selecting switch control Pin 16 is not set up interiorily through logic, but depending on the outside voltage input the changing procedure of voltage range exists as deck A or B. In order to delete the pop - noise which occurs at the time of A/B changing state, this transmission range is selected under the consideration of its design. Even by delaying and reducing or creasing the pin 16 input voltage, the pop noise changes in 's sound can not be heard through our naked eye. Note 2 : double input switch ( Pin16 ) control voltage
100uA 10K
The two step switch is Pin 16 which selects the A/B deck. This control voltage is as Fig 2.6. 1. High mode's voltage is more than 2V which is more than sufficient. It is nice to have the low mode in 0.3 voltage or just open it as it is. When it isopened, Pin's voltage is almost zero and in turn results in low voltage.
VCC
C1 : 22 ~ 47uF
16
10U
Fig 2 - 4 Bias A - on B - on
2. As seen in the Fig 2.6 graph, if 0 volts is inputted into DC direction under low condition, special blazing fire could result so it is wise to switch to low when using at open state or at pull down resistance state.
B - off
0.9V 1.2V 80 mSec at C1:22uF
A - off
1.6V
Control Voltage
Fig 2 - 5
Note 3: Double input switch ( Pin 18, Pin 19 ) controlled voltage It is constructed into logic formation as different from A/B switch, and the input condition which applies to binary switch formation seem
Bias *2 Open State
ON
rather difficult. About the Low = 0.6 to 0.8 V should be inserted. This under Pin 6 connects to Pin 18, Pin 19 with resisting value of 15U At open state, it becomes 0.7 Volt. High is more than 2 Volt. .
OFF 0.9V 1.6V Control Voltage About 10mV at floating
Fig 2 - 6
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
3. Head Connection Method
3-1 Tape Head connecting method By the virtue of NAB amplifiers input construction layout of this product, the input voltage bias is ' systemised to be supplied from an outside source and head's connection follow below constructed plan / layout's style.
2
3 *N 1
4
6
15
16
+
7
21
23
REC
P R H
+
+
OSC
+
+
VCC
Fig 3 - 1
In employing record signal, the A/B switch
input of pin 16 must be turned into B deck mode. ( It only applies to the above situation ). To suite the user's conviences A and B's extremeties are designed to be replaced. If the record OSC's ingredients exist in play back input, it will have damaging effect within the KA22296. That is why precautions are neccessary. And within recording output pin the ALC DET is internally connected, if recording AC bias appears in this terminal the ALC moves distortly, use the trap to make the recording output terminal bias as small as possible and choose the ' appropriate OSC frequency for the trap. Also at the play mode, since the recording terminals output D.C is bound by 2.1V and abandon it. N : Use/ apply the above switch if OSC frequency find within record mode at the system for mation.
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
3 - 2. Head Input Circuit ( FET switch )
RECORD OUT
REC(High) Play(Open)
At this point, in order to make OSC as low as possible control the OSC frequency and trap.
To Pin6 (Vref)
PLAY HEAD
R/P HEAD
+
+
Play(High) REC(Open)
If in case the capacitor is not sufficiently large enough, at the time of recording blocking eruption will occur within the specfied frequency.
Tape in-B
Tape in-A
Fig 3- 2
After switching the play head signal will be inputed into tape, and be aware of many forming Hums.
21/23 Rec out
20/24 Rec NF
Open the capacitor between the output and the NF Fig 3- 3
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
4. Outside Input
This product is so designed to accomdate 3 types of outside input and 3 paired input terminals are also present too. It is possible to use each of them independently and their selection lies within the switch output condition of table 1,2. Under the condition of usage it is wise to be aware of situations since it could be inputed through reduction from outside. Take it as a reference when input impedance is reduced to approximately 30U especially the input dynamic range is 0.6Vrms. , The input monitor output gain is 6dB, and take it into an account that record output's gain is 26dB.
30U
8/11 Line 1
30U
0dB
6dB
25/26 Monitor Output
9/12 Line 2
30U
0dB 26dB 0dB NAB AMP Fig 4 - 1
21/23 Record Output
10/13 AUX
5. Mic Input
The MIC amplifier's advantage is 20dB. Attention MIC input signal level at MIC mixing mode or another input signal with mixing input signal can reduce because of ALC operating from excessing MIC input signal.
+
MIC +
14
Mic input
17
Mic switch
VCC Fig 5 - 1
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
6. NAB CIRCUIT DESIGN
NAB device is comprised of R1, R2, C1 and its impedance is as expressed and given.
to input selector R2 = 1.8K
+ R2 = 3.3K
1 + j w C1 { R1 R2 / ( R1 + R2)}
H N
28/29
Z =(R1 + R2) 1 + j w C1 R1
27/30
R1=82K
And T1 = C1R1,
Rnt = 82 47uF
C1=0.039uF
T2 = C1 ( R1 // R2), T1 = 3198mSec, Fig 6 - 1
** Internal resistance R2's processor distribution is 3/4 20%.
T2 = 123mSec (Nomal) 3/4 24mSec, = 70mSec (High) 3/4 14mSec
Frequency gain can be esaily discovered as per given. Gv = 20log ((Rnf + Z) / Rnf)
7. Etc
* At
the time of High speed copying mode, the ALC will be off and actual recorded system is used while for normal speed it is recorded through ALC. advisable to keep the voltage below 6V for security. peaking circuit for recording at high speed recording mode. The head switching is used as mechanical switch or FET switch for recording circuit.
* Within the switch input, it is * It may consider the external
KA22296
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
8. AMP GAIN DIAGRAM OF EACH MODE
8 - 1. Tape Playback ae Monitor output 36dB/1KHz
NABAMP
-64dBm -28dBm
0dB
Input selector
-28dBm
0dB
INVAMP
-28dBm
6dB (Gain)
MONAMP
-22dBm
8 - 2. EXT Playback ae Monitor output 0dB
Input selector
-28dBm -28dBm
0dB
INVAMP
-28dBm
6dB (Gain)
MONAMP
-22dBm
8 - 3. MIC Playback ae Monitor output 20dB
MICAMP
-48dBm -28dBm
0dB
Input selector
-28dBm
0dB
INVAMP
-28dBm
6dB (Gain)
MONAMP
-22dBm
8 - 4. Tape Playback aeRecord output 36dB/1KHz
NABAMP
-68dBm -32dBm
0dB
Input selector
-32dBm
0dB
INVAMP
-32dBm
28dB (Gain)
RECAMP
-4dBm
8 - 5. EXT Playback aeRecord output 0dB
Input selector
-32dBm -32dBm
0dB
INVAMP
-32dBm
28dB (Gain)
RECAMP
-4dBm
8 - 6. MIC Playback ae Record output 20dB
MICAMP
-52dBm -32dBm
0dB
Input selector
-32dBm
0dB
INVAMP
-32dBm
28dB (Gain)
RECAMP
-4dBm
KA22296
9. TEST CIRCUIT
DOUBLE DECK SYSTEM FOR RADIO CASSETTE
82U 82U 47uF
30
3.3U
22uF
NAB - AMP +
1
VT1
29
220U 22uF
A B
VT2
220U 22uF
0.039uF 82U 0.039uF 82U 47uF
1.8U
28
2
27
3.3U
VT3
220U 22uF
3
NAB - AMP + B A
VT4
220U
10uF
1.8 U
4 5 6
Voltage Regulator
26
10uF
10U
TMON1 TMON2
25
10U
X2
X2
VCC
S9
100 uF
7
100 uF
1uF INV + AMP -
VE1
680U 1uF
8
INPUT SELECTOR
20U
24
VE2
680U 1uF
9 10
10uF
1U
20U
VE3
680U 1uF
20U REC - AMP +
20U
CCA
10uF
11
VE4
680U 1uF
23
10U
TREC1
INV + AMP -
INPUT SELECTOR
12
VE5
680U 1uF
LEVEL DET
CCA
22
20U
VE6
680U 1uF
0.47uF 10uF
S8
13 14
20U
20U
REC + AMP -
21
VM
680U
10U
TREC2
MIC + AMP -
20U
1U
SWITCH CONTROL
20U
2U
20
10uF
15
16
17
18
19
S1 22U
S2 S3 22U
S4 22U 10U
S5 22U
S6
S7
VCC
10U
10U 15U 15U

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