NTE727 Integrated Circuit Four Independent AC Amplifiers Description: The NTE727 is a silicon monolithic integrated circuit in a 16–Lead DIP type package consisting of four independent identical AC amplifiers which can operate from a single–ended power supply. The amplifiers include internal DC bias and feedback to provide temperature–stabilized operation. They may be used in a wide variety of AC applications in which operational amplifiers have previously been used. Each high gain amplifier has a high impedance non–inverting input, and a lower impedance inverting input for the application of feedback. Two power–supply terminals and two ground terminals are provided to reduce internal and external coupling between amplifiers. Features: D Four AC Amplifiers on a Common Substrate D Independently Accessible Inputs and Outputs D Operates from a Single–Ended Supply D Noise Figure (Each Amp): 2dB Typ @ 1kHz D High Voltage Gain (Each Amp): 53dB Min D High Input Resistance (Each Amp): 90kΩ Typ D Undistorted Output Voltage (Each Amp): 2Vrms Min D Output Impedance (Each Amp): 1kΩ Typ D Open–Loop Bandwidth (Each Amp): 300kHz Typ Applications: D Multi–Channel or Cascade Operation D Low–Level Preamplifiers D Equalizers D Linear Signal Mixers D Tone Generators D Multivibrators D AC Intergrators Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Power Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16V AC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5Vrms Power Dissipation (TA = +55°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW Derate Above 55°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7mW/°C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Electrical Characteristics: (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Static (VCC = 12V) Current Drain Per Amplifier Pair I12 or I15 9.5 13.5 17.5 mA DC Voltage at Output Terminals V1, V6, V11, V16 6.1 6.9 8.1 V DC Voltage at Feedback Terminals V3, V7, V10, V14 1.7 2.0 2.3 V DC Voltage at Input Terminals V4, V8, V9, V13 2.2 2.5 2.8 V Dynamic (Characteristics given are for each amplifier with no AC feedback) Open–Loop Gain Output Voltage Swing AOL VCC = 12V, EIN = 2mV, f = 10kHz 53 58 – dB VO(rms) VCC = 12V, f = 1kHz, THD = 5% 2.0 2.4 – V 250 300 0 kHz Open–Loop –3dB Bandwidth BW VCC = 12V, EIN = 2mV Total Harmonic Distortion THD VCC = 12V, f = 1kHz, EOUT = 2Vrms – 0.65 – % Input Resistance RIN Open Loop, f = 1kHz, Note 1 – 90 – kΩ Input Capacitance CIN f = 1MHz – 9 – pF Output Resistance ROUT Note 1 – 1 – kΩ Output Capacitance COUT f = 1MHz – 18 – pF Feedback Capacitance (Output to Non–Inverting Input CFB VCC = 12V, f = 1MHz – <0.1 – pF Broad–Band Output Noise Voltage EN VCC = 12V, RS = 10kΩ, A = 40dB, Equivalent Noise BW = 50kHz – 0.3 1.0 mV – 0.5 2.2 mV f = 10Hz – 10.0 – dB f = 100Hz – 5.8 – dB f = 1kHz – 2.0 – dB f = 10kHz – 1.1 – dB f = 100kHz – 0.6 – dB Output Noise Voltage “Weighted” Noise Figure EN(WT) NF RS = 5kΩ Inter–Amplifier Audio Separation “Crosstalk” CT VCC = 12V, f = 1kHz, 0dB = 0.78V – <–45 – dB Inter–Amplifier Capacitance (Any amplifier output to any other amplifier input) C VCC = 12V, f = 1MHz – <0.02 – pF Note 1. Pin3, Pin7, Pin10, and Pin14 are bypassed to GND. Pin Connection Diagram Output Amp 1 1 16 Output Amp 4 15 (+) VCC 1 GND 1 2 –Input Amp 1 3 14 –Input Amp 4 +Input Amp 1 4 13 _Input Amp 4 12 (+) VCC 2 GND 2 5 Output Amp 2 6 11 Output Amp 3 –Input Amp 2 7 10 –Input Amp 3 +Input Amp 2 8 9 +Input Amp 3 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)