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TA7784P LINEAR INTEGRATED CIRCUIT
DUAL PRE-AMPLIFIER FOR AUTOREVERSE
DESCRIPTION
The Contek TA7784P is a dual pre-amplifier for auto-reverse
type and W-cassette type tape player. This IC contains dual
pre-amplifier, forward/ reverse control switches and metal/
normal tape equalizer control switches.
FEATURES
*High voltage gain: GVO=95dB(typ) at Vcc=6V f=1kHz
*Wide operating supply voltage(V
*No input coupling capacitor
*Low noise( VNI=1mVrms(typ) at Rg=600W ,
BW=20Hz~20kHz, NAB EQ)
BLOCK DIAGRAM
CC= 3.5V~15V)
DIP-16
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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TA7784P LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUN RATINGS(Ta=25 C)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vcc 16 V
Power Dissipation PD 750 mW
Operating Temperature Topr -25~75 C
Storage Temperature Tstg -55~150 C
Note: de-rated above Ta=25 C in the proportion of 6mW/ C.
ELECTRICAL CHARACTERISTICS(Ta=25 C,Vcc=6V,Rg=600 W, f=1kHz, unless otherwise specified
PARAMETER SYMBOL TEST
CIRCUIT
Quiescent Current ICCQ1 1 VIN=0, Normal EQ 5.5 mA
ICCQ1 1 VIN=0, Metal EQ 7 11
Open Loop Voltage Gain GVo 1 Cf=100mF,Rf=0 95 dB
Maximum Output Voltage VOM 1 THD=0.5% 1.1 1.5 Vrms
Total Harmonic Distortion THD 1 Vout=0.5Vrms 0.035 0.12 %
Equivalent Input Noise VNI 1 Rg=620W,NAB
Ripple Rejection RR 1 f=100Hz,Vin=1Vrms 55 dB
Cross Talk CT 1 Vout=0dBm 50 60 dB
Forward/ Reverse Cross
Talk
CT(F/R) Vout=0dBm 60 70 dB
TEST
CONDITIONS
BW:20Hz~20kHz
Metal EQ
MIN TYP MAX UNIT
11.7mVrms
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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TA7784P LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT(Pin Configuration and DC Voltage
C8
Ch1
Out
Vcc
=10kW
L
R
C10
100 mF
f=22 mF
SW2-1
NF =330k WRf=180k W
R
SW1-1
100 mFC
a
b
0.01 mF
R3=12k W
C6
R4=18k W
4.7 mF
4 26 1
5
SW1-2
AMP
AMP
10
C7
0.01 mF
R4=18k
R3=12k W
RNF =330k WRf=180k W
EQ SW
F/R SW
W
C8
4.7 mF
R6
Rg
R9
620 Wx4
R7
R8
SG
=100 mF
1
C
7
C3
C4
Bias
9
13
C5
11
SW2-2
f=22 m F
b
a
Contek
100 mFC
*Gvo Test: SW1-1, 2: Off, SW2-1, 2:B
Pin Configuration and DC Voltage( Vcc=6V, Ta=25 C, Unless otherwise specified)
DC VOLTAGE
PIN
12 3 4567 8 91011121314 15 16
NO.
VALUE
Vcc 2.3 Vcc/GND 2.2 2.2 2.2 2.2 GND 2.2 NC 2.2 2.2 2.2 2.2 Vcc/GND 2.2
(V)
Vcc
15
W
47k
3
1 mF
M
N
F
R
8161412
Ch2
Out
=10kW
L
R
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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TA7784P LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
1.Forward/Reverse select switch
1 Threshold voltage: Pin 3 is coupled to the base of
Q1( PNP-Tr) as Fig. 1 The threshold voltage is 0~0.3V
at reverse stage and is 1.1~Vcc at the Forward stage.
2 The recommended Forward/ Reverse select circuit is
shown in Fig. 2
3 I3(Fig. 1)=12mA,Ta=25 C
2.Equalizer control switch
Pin 15 is coupled to the base of Q2 ( PNP Tr) as shown
Fig. 3. The emitter potential of Q2 is 2.6V. The threshold
voltage is 21~Vcc at Metal EQ stage and is 0~1.2V at the
Normal EQ stage.
3.C2/C3/C4/C5
Capacitor C2~C5 may be required for preventing a
instability caused by the pattern layout or interference of
external high frequency signal.
IE=100 mA
3
3
2.6V
I
3
30~50W
1mF
Fig 1
1.5V
F
R
Fig 2
CONTEK
15
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
Fig 3
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