NTE1577 Integrated Circuit Dual, Low Noise Preamp w/Auto Reverse Description: The NTE1577 is a dual preamplifier with tape autoreverse facilityin a 16–Lead DIP type package designed for the amplification of low level signals in applications requiring very low noise performance, as stereo cassette players. Each channel consists of two independent amplifiers. The first has a fixed gain of 30dB while the second one is an operational amplifier optimized for high quality audio application. Features: D Very Low Noise D High Gain D Large Output Voltage Swing D Low Distortion D Tape Autoreverse Facility D Single Supply Operation D Short Circuit Protection D Wide Supply Range Absolute Maximum Ratings: Supply Voltage, VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V Total Power Dissipation (TA = +60°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600mW Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C/W Electrical Characteristics: (TA = +25°C, VS = 14.4V, GV = 60dB unless otherwise specified) Parameter Symbol Supply Current IS Output Current (Pin1 to Pin15) Source IO Test Conditions Min Typ Max Unit VS = 8V to 30V – 10 – mA VS = 8V to 30V – 10 – mA – 1 – mA – 60 – dB Sink Closed Loop Gain GV f = 20Hz to 20kHz Electrical Characteristics (Cont’d): (TA = +25°C, VS = 14.4V, GV = 60dB unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Input Resistance Ri f = 1kHz 50 80 – kΩ Output Resistance (pins 1–15) Ro f = 1kHz – 50 – Ω f = 1kHz – 0.05 – % f = 10kHz – 0.05 – % – 12 – V VS = 30V – 28 – V Rg = 50Ω – 0.25 – µV Rg = 600Ω – 0.4 0.6 µV Rq = 5kΩ – 1.3 – µV Vin = 0.3mV, Rg = 600Ω, Note 1 – 57 – dB Vin = 1mV, Rg = 0, Note 1 – 73 – dB Total Harmonic Distortion THD Output Voltage Swing (Pin1 to Pin15) VO Total Input Noise en Signal–to–Noise Ratio VO = 300mV Peak–to–Peak VS = 14.4V Note 1 S/N Channel Separation CS f = 1kHz – 60 – dB Crosstalk (Differential Input) CT f = 1kHz, Note 3 – 80 – dB Supply Voltage Rejection SVR f = 1kHz, Rg = 600Ω, Note 2 – 120 – dB Supply Voltage Rejection of Reference Voltage (Pin4) SVR f = 1kHz, Rg = 600Ω, Note 2 – 100 – dB Reference Voltage (Pin 4) Vref – 55 – mV Reference Voltage Output Resistance (Pin4) Rref – 100 – Ω Voltage Temperature Coefficient ∆Vref ∆T – 10 – µV/°C Note 1. The weighting filter used for the noise measurement has a curve A frequency response. Note 2. Referred to the input Note 3. Between a disabled input and an input ON. Electrical Characteristics: (VS = 30V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 29 30 30.5 dB f = 1kHz – 0.05 – % f = 10kHz – 0.05 – % Amplifier No. 1 Gain (Pin6 to Pin5) Distortion GV d VO = 300mV Total Input Noise en Rg = 600Ω, Note 1 – 0.4 – µV Output Impedance (Pin5) ZO f = 1kHz – 100 – Ω Output Current (Pin5) IO – 1 – mA DC Output Voltage (Pin5) V5 1.3 2 2.7 V VS = 10V Note 1. The weighting filter used for the noise measurement has a curve A frequency response. Electrical Characteristics (Cont’d): (VS = 30V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Amplifier No. 2 Open Loop Voltage Gain (Pin2 to Pin1) GV – 100 – dB Input Bias Current IB – 0.2 – µA Input Offset Voltage VOS – 2 – mV Input Offset Current Ios – 0.05 – µA Small Signal Bandwidth BW GV = 30dB – 150 – kHz – 2 – µV 150 500 – kΩ Total Input Noise en Rg = 600Ω, Note 1 Input Impedance RI f = 1kHz (Open Loop) Note 1. The weighting filter used for the noise measurement has a curve A frequency response. Autoreverse: V12 < 2V V12 > 4.5V Pin 6 – 10 OFF ON 7–9 ON OFF Pin Connection Diagram Output A 1 Non–Inverting Input A 2 Inverting Input A 3 Voltage Reference 4 Output 5 16 VCC 15 Output B 14 Non–Inverting Input B 13 Inverting Input B 12 Threshold Input 6 11 Output Input 7 10 Input GND 8 9 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)