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=6V，f=1kHz *Wide operating supply voltage(VCC= 3.5V~15V) *No input coupling capacitor *Low noise( VNI=1µVrms(typ) at Rg=600Ω, BW=20Hz~20kHz, NAB EQ) DIP-16 BLOCK DIAGRAM UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R110-010,A UTC 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=600Ω, f=1kHz, unless otherwise specified） PARAMETER SYMBOL TEST TEST MIN TYP MAX UNIT CIRCUIT CONDITIONS Quiescent Current ICCQ1 1 VIN=0, Normal EQ 5.5 ICCQ1 1 VIN=0, Metal EQ 7 Open Loop Voltage Gain GVo 1 Cf=100µF,Rf=0 Maximum Output Voltage VOM 1 THD=0.5% Total Harmonic Distortion THD 1 Vout=0.5Vrms 0.035 0.12 % Equivalent Input Noise VNI 1 Rg=620Ω,NAB 1 1.7 µVrms 1.1 mA 11 95 dB 1.5 Vrms BW:20Hz~20kHz Metal EQ Ripple Rejection RR 1 f=100Hz,Vin=1Vrms 55 dB Cross Talk CT 1 Vout=0dBm 50 60 dB Vout=0dBm 60 70 dB Forward/ Reverse Cross CT(F/R) Talk UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R110-010,A UTC TA7784P LINEAR INTEGRATED CIRCUIT TEST CIRCUIT(Pin Configuration and DC Voltage C8 4.7 µF RNF=330kΩ SW1-1 R3=12kΩ Cf=22 µF C6 0.01 µF 100 µF a b SW2-1 R4=18kΩ 6 4 Ch1 Out RL=10kΩ Rf=180kΩ Vcc C10 100 µF 2 1 5 Vcc AMP R6 Rg M 7 SG C1=100µF R7 9 R8 15 EQ SW C3 Bias C4 3 F/R SW F R 1 µF 13 N 47kΩ R9 620Ωx4 C5 AMP 11 12 b SW2-2 10 14 16 8 a C7 0.01 µF 100 µF R4=18kΩ R3=12kΩ SW1-2 Rf=180kΩ Ch2 Out C8 4.7 µF RNF=330kΩ RL=10kΩ Cf=22 µF *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 1 2 NO. VALUE 3 4 Vcc 2.3 Vcc/GND 2.2 5 6 7 8 2.2 2.2 2.2 GND 9 10 11 12 13 14 2.2 NC 2.2 2.2 2.2 2.2 15 16 Vcc/GND 2.2 (V) UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R110-010,A UTC TA7784P LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION 1.Forward/Reverse select switch 1） Threshold voltage: Pin 3 is coupled to the base of IE=100 µA 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 3 I3 shown in Fig. 2 3） I3(Fig. 1)=12µA,Ta=25°C。 Fig 1 2.Equalizer control switch Pin 15 is coupled to the base of Q2( PNP Tr) as shown 1.5V 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 3 Normal EQ stage. 30~50W F R 1µF Fig 2 3.C2/C3/C4/C5 Capacitor C2~C5 may be required for preventing a 2.6V instability caused by the pattern layout or interference of external high frequency signal. 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