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UTC TA7784P
LINEAR INTEGRATED CIRCUIT
DUAL PRE-AMPLIFIER FOR AUTO-REVERSE
DESCRIPTION
The UTC 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=6Vf=1kHz *Wide operating supply voltage(VCC= 3.5V~15V) *No input coupling capacitor *Low noise( VNI=1Vrms(typ) at Rg=600, BW=20Hz~20kHz, NAB EQ)
DIP-16
BLOCK DIAGRAM
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R110-010,A
UTC TA7784P
LINEAR INTEGRATED CIRCUIT
VALUE
16 750 -25~75 -55~150
ABSOLUTE MAXIMUN RATINGS(Ta=25C) PARAMETER SYMBOL
Supply Voltage Power Dissipation Operating Temperature Storage Temperature Vcc PD Topr Tstg
UNIT
V mW C C
Note: de-rated above Ta=25C in the proportion of 6mW/C.
ELECTRICAL CHARACTERISTICS(Ta=25C,Vcc=6V,Rg=600, f=1kHz, unless otherwise specified PARAMETER SYMBOL TEST TEST MIN TYP MAX UNIT CIRCUIT CONDITIONS
Quiescent Current Open Loop Voltage Gain Maximum Output Voltage Total Harmonic Distortion Equivalent Input Noise ICCQ1 ICCQ1 GVo VOM THD VNI 1 1 1 1 1 1 VIN=0, Normal EQ VIN=0, Metal EQ Cf=100F,Rf=0 THD=0.5% Vout=0.5Vrms Rg=620,NAB BW:20Hz~20kHz Metal EQ Ripple Rejection Cross Talk Forward/ Reverse Cross Talk RR CT CT(F/R) 1 1 f=100Hz,Vin=1Vrms Vout=0dBm Vout=0dBm 50 60 55 60 70 dB dB dB 1.1 5.5 7 95 1.5 0.035 1 0.12 1.7 11 dB Vrms % Vrms mA
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R110-010,A
UTC TA7784P
LINEAR INTEGRATED CIRCUIT
C8 4.7 F RL=10k
TEST CIRCUIT(Pin Configuration and DC Voltage
Rf=180k SW1-1 R3=12k Cf=22 F a SW2-1 b 100 F C6 0.01 F R4=18k RNF=330k
Ch1 Out Vcc
C10 100 F
6
4
2
1
5
R6 Rg
AMP
Vcc
7
R7 R8 C3
M
SG
C1=100F
EQ SW Bias F/R SW
15 3
1 F 47k F R
9
C4
N
13
R9 620x4 C5
AMP
11
SW2-2 a Cf=22 F
b
12
10
C7 0.01 F SW1-2
14
R4=18k R3=12k
16
8
100 F
C8 4.7 F
Ch2 Out
RL=10k
Rf=180k
RNF=330k
*Gvo Test: SW1-1, 2: Off, SW2-1, 2:B
Pin Configuration and DC Voltage( Vcc=6V, Ta=25C, Unless otherwise specified)
DC VOLTAGE PIN 12 NO.
VALUE (V)
3
4
5
2.2
6
2.2
7
2.2
8
GND
9 10 11 12 13 14
2.2 NC 2.2 2.2 2.2 2.2
15
Vcc/GND
16
2.2
Vcc 2.3 Vcc/GND 2.2
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R110-010,A
UTC TA7784P
LINEAR INTEGRATED CIRCUIT
IE=100 A
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)=12A,Ta=25C
3
I3
Fig 1
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.
30~50W 1.5V F R 1F
3
Fig 2 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.
2.6V
15
Fig 3
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R110-010,A

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