NTE1578 Integrated Circuit FM Mixer/IF Amp Description: The NTE1578 is an FM front–end integrated circuit in a 16–Lead DIP type package designed for use in car radio and home stereo applications. This device has a built–in AGC driver circuit which improves interference characteristics. It thereby offers advantages such as improved interference characteristics without sacrificing usable sensitivity and the conventional DX–LOCAL change–over switch. Features: D Double–Balanced Type MIX (Improved Spurious Characteristic) D Keyed AGC/Keyed Classical AGC (Improved Intermodulation, Cross Modulation Characteristic) D Differential IF Amplification (Improved Limiting Characteristic) Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Maximum Supply Voltage (Pin12, Pin15), VCC1max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5V Maximum Supply Voltage (Pin5, Pin6), VCC2max . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Allowable Power Dissipation (TA ≤ +50°C, Note 1), PDmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mW Operating Temperature Range, Topg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Note 1. PDmax = 460mW at TA = +70°C Recommended Operation Condition: (TA = +25°C unless otherwise specified) Recommended Supply Voltage (Pin12, Pin15), VCC1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V Recommended Supply Voltage (Pin5, Pin6), VCC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13V Electrical Characteristics: (TA = +25°C, VCC1 = 8V, VCC2 = 13V unless otherwise specified) Parameter Dissipation Current Symbol Test Conditions Min Typ Max Unit ICC1 Pin 12, 15 17 25 36 mA ICC2 Pin 5, 6 5 8 11 mA Local OSC Input Offset ∆VINOSC –20 0 20 mV MIX Input Offset ∆VINMIX –20 0 20 mV ∆IOUT MIX –600 0 600 µA MIX Output Offset High Level AGC Output VAGC H Vi = 0dBu, VCL = 4V 7.6 7.9 – V Low Level AGC Output VAGC L Vi = 100dB, VCL = 4V – 0.5 1 V Electrical Characteristics (Cont’d): (TA = +25°C, VCC1 = 8V, VCC2 = 13V unless otherwise specified) Parameter Symbol AGC Control Input Test Conditions Min Typ Max Unit VCL 7 Vi = 100dBu, VAGC = 7V – 0.35 0.6 V VCL 2 Vi = 100dBu, VAGC = 2V 1.2 1.7 2.2 V 230 330 430 ohm IF Input Resistance RIN Voltage Gain VG Vi = 62dBu 80 85 90 dBµ Vi lim VAGC = 2V 62 71 80 dBµ AGC Input Voltage Vi AGC VAGC = 2V 62 71 80 dBµ Saturation Output Voltage VOUT Vi = 100dBµ 91 95 – dBµ Input Limiting Voltage Pin Connection Diagram IF Input 1 IF Decoupling 2 GND 3 AGC Input 4 16 IF Output 15 VCC 14 AGC Inhibit 13 AGC Output Mixer Output 5 12 VCC Mixer Output 6 11 GND OSC Input 7 10 RF Input OSC Input 8 9 RF Input 16 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7)