TA7784P

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 VALUE 16 750 -25~75 -55~150 ABSOLUTE MAXIMUN RATINGS(Ta=25°C) PARAMETER SYMBOL Supply Voltage Power Dissipation Operating Temperature Storage Temperature Vcc PD Topr Tstg UNIT V mW °C °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 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=100µF,Rf=0 THD=0.5% Vout=0.5Vrms Rg=620Ω,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 % µVrms mA UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R110-010,A UTC TA7784P LINEAR INTEGRATED CIRCUIT C8 4.7 µF RL=10k Ω TEST CIRCUIT(Pin Configuration and DC Voltage Rf=180kΩ SW1-1 C6 0.01 µF RNF=330kΩ Ch1 Out Vcc C10 100 µF R3=12kΩ R4=18kΩ Cf=22 µF a SW2-1 b 100 µF 6 4 2 1 5 R6 Rg AMP Vcc 7 R7 R8 C3 M SG C1=100µF EQ SW Bias F/R SW 15 3 1 µF 47kΩ F R 9 C4 N 13 R9 620Ω x4 C5 AMP 11 SW2-2 a Cf=22 µF b 12 10 C7 0.01 µF SW1-2 14 R4=18kΩ R3=12kΩ 16 8 100 µF C8 4.7 µF Ch2 Out RL=10k Ω Rf=180kΩ RNF=330kΩ *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 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 µA 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)=12µA,Ta=25°C。 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 3 1µF 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