NTE1803 Integrated Circuit Stereo Audio Control Description: The NTE1803 is an linear integrated circuit in a 18–Lead DIP type package designed as an active stereo tone/volume control for car radios, TV receivers, and audio equipment. It includes functions for bass and treble control, volume control with built–in contour (can be switched off), and balance. All these functions can be controlled by DC voltages or by single linear potentiometers. The bass and treble responses are defined by a single capacitor per control per channel. Features: D Few External Components Necessary D Low Noise due to Internal Gain D Bass Emphasis can be Increased by a Double–Pole Low–Pass Filter D Wide Power Supply Range Applications: D Hi–Fi Radio D Auto Radio D TV D Audio Systems Absolute Maximum Ratings: Supply Voltage (V3–18), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Total Power Dissipation, PTOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200mW Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +80°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C DC Electrical Charactertistics: (VCC = 12V, TA = +25°C, RG ≤ 600Ω, RL ≤ 4.7kΩ, CL ≤ 200pF unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 7.5 – 16.5 V VCC = 8.5V 19 27 36 mA VCC = 12V 25 35 45 mA VCC = 15V 30 43 56 mA VCC = 8.5V 3.8 4.25 4.7 V VCC = 12V 5.3 5.9 6.6 V VCC = 15V 6.5 7.3 8.2 V VCC = 8.5V 3.3 4.25 5.2 V VCC = 12V 4.6 6.0 7.4 V VCC = 15V 5.7 7.5 9.3 V VCC = 8.5V 3.5 3.75 4.0 V – – 0.5 mA Linear (Switch Open) 1.5 – 10 mA VCC ≥ 10.8V, voltage range forced to Pin17(Contour cannot be switched OFF) 4.5 – VCC/2–VBE V 1.0 – 4.25 V 0.25 – 3.8 V – – 5 µA Supply (Pin3) Supply Voltage (VCC) V3–18 Supply Current (IC) DC Input Levels (Pin4 and Pin15) DC Output Levels (Pin8 and Pin11) under all control voltage conditions with DC feedback I3 V4, 15–18 V8, 11–18 Pin17 Application with Internal Potentiometer V17–18 Contour ON/OFF Switch (Control by I17) –I17 Application without Internal Potentiometer Contour (Switch Open) V17–18 DC Control Voltage Range for volume, V1, 9, 10, 16 V17–18 = 5V bass, treble, and balance (Pin1, Using internal supply Pin9, Pin10, and Pin16 respectively) Input Current of Control Inputs (Pin1, –I1, 9, 10, 16 Pin9, Pin10, and Pin16) AC Electrical Charactertistics: (VCC = V3–18 = 12V, TA = +25°C, contour switch closed (linear posi tion), volume, balance, bass, and treble controls in mid–position, RG ≤ 600Ω, RL ≤ 4.7kΩ, CL ≤ 200pF, f = 1kHz unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 20.5 21.5 23 dB Control Range Maximum Gain of Volume AVmax Volume Control Range ∆AV AVmax/AVmin 90 100 – dB Balance Control Range ∆AV AV = 0dB – –40 – dB Bass Control Range at 40Hz ∆AV ±12 ±15 – dB Treble Control Range at 16kHz ∆AV ±12 ±15 – dB AV = 20dB, Note 1 10 – – kΩ AV = –40dB, Note 1 – 160 – kΩ – – 300 Ω Signal Inputs, Outputs Input Resistance (Pin4 and Pin15) Output Resistance (Pin8 and Pin11) R14,15 RO8,11 Note 1. Equation for input resistance: RI = 160kΩ ; AVmax = 12. 1 + AV AC Electrical Charactertistics (Cont’d): (VCC = V3–18 = 12V, TA = +25°C, contour switch closed (linear position), volume, balance, bass, and treble controls in mid–position, RG ≤ 600Ω, RL ≤ 4.7kΩ, CL ≤ 200pF, f = 1kHz unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit VCC(RMS) ≤ 200mV, f = 100Hz, AV = 0dB 35 50 – dB Signal Processing Power Supply Ripple Rejection PSRR Channel Separation (250Hz to 10kHz) αCS AV = –20dB to +21.5dB 46 60 – dB Spread of Volume Contol with Constant Control Voltage ∆AV V1–18 = 0.5V17–18 – – ±3 dB Gain Tolerance Between Left and Right Channel ∆AV, L–R V16–18 = V1–18 = 0.5V17–18 – – 1.5 dB AV = 21.5dB to –26dB, f = 250Hz to 6.3kHz, balance adjusted at AV = 10dB – – 2.5 dB VCC = 8.5V, THD = 0.5%, f = 1kHz (RMS Value) 1.4 – – V VCC = 8.5V, THD = 0.7%, f = 1kHz (RMS Value) 1.8 2.4 – V VCC = 12V, THD = 0.5%, f = 40Hz to 16kHz (RMS Value) 1.4 – – V VCC = 12V, THD = 0.7%, f = 40Hz to 16kHz (RMS Value) 2.0 3.2 – V VCC = 15V, THD = 0.5%, f = 40Hz to 16kHz (RMS Value) 1.4 – – V VCC = 15V, THD = 0.7%, f = 40Hz to 16kHz (RMS Value) 2.0 3.2 – V VCC = 8.5V, THD = 0.5%, f = 1kHz (RMS Value) 1.8 2.0 – V VCC = 8.5V, THD = 10%, f = 1kHz (RMS Value) – 2.2 – V VCC = 12V, THD = 0.5%, f = 40Hz to 16kHz (RMS Value) 2.5 3.0 – V VCC = 15V, THD = 0.5%, f = 40Hz to 16kHz (RMS Value) – 3.5 – V – 260 – µV AV = –3dB, Not e 4 – 70 140 µV for maximum voltage gain, Note 4 – 890 – µV for maximum emphasis of bass and treble (contour OFF, AV = –40dB), Note 4 – 360 – µV ∆AV Tracking Between Channels Signal Handling with DC Feedback Input Signal Handling Output Signal Handling (Note 2, Note 3) VI(RMS) VO(RMS) Noise Performance (VCC = 8.5V) Output Noise Voltage (Unweighted) at f = 20Hz to 20kHz (RMS value) Output Noise Voltage (Weighted) CCIR recommendation 468–2 (peak value) VNO(RMS) for maximum voltage gain, Note 4 VNO(M) Note 2. Frequencies below 200Hz and above 5kHz have reduced voltage swing. The reduction at 40Hz and at 16kHz is 30%. Note 3. In the event of bass boosting the output signal handling is reduced. The reduction is 1dB for maximum bass boost. Note 4. Linear frequency response. AC Electrical Charactertistics (Cont’d): (VCC = V3–18 = 12V, TA = +25°C, contour switch closed (linear position), volume, balance, bass, and treble controls in mid–position, RG ≤ 600Ω, RL ≤ 4.7kΩ, CL ≤ 200pF, f = 1kHz unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit – 310 – µV AV = –16dB, Note 4 – 100 200 µV for maximum voltage gain, Note 4 – 940 – µV for maximum emphasis of bass and treble (contour OFF, AV = –40dB) – 400 – µV – 350 – µV AV = –16dB, Note 4 – 110 220 µV for maximum voltage gain, Note 4 – 980 – µV for maximum emphasis of bass and treble (contour OFF, AV = –40dB) – 420 – µV Noise Performance (VCC = 12V) Output Noise Voltage (Unweighted) at f = 20Hz to 20kHz (RMS value), Note 5 Output Noise Voltage (Weighted) CCIR recommendation 468–2 (peak value) VNO(RMS) for maximum voltage gain, Note 4 VNO(M) Noise Performance (VCC = 15V) Output Noise Voltage (Unweighted) at f = 20Hz to 20kHz (RMS value), Note 5 Output Noise Voltage (Weighted) CCIR recommendation 468–2 (peak value) VNO(RMS) for maximum voltage gain, Note 4 VNO(M) Note 4. Linear frequency response. Note 5. For peak values add 4.5dB to RMS values. Pin Connection Diagram Volume Control 1 18 GND Bypass 2 17 Reference Control Voltage VCC 3 16 Balance Control Rt Ch Input 4 15 Lt Ch Input Rt Ch Bass Capacitor 5 14 Lt Ch Bass Capacitor Rt Ch Bass Capacitor 6 13 Lt Ch Bass Capacitor Rt Ch Treble Capacitor 7 12 Lt Ch Treble Capacitor Rt Ch Output 8 11 Lt Ch Output Bass Control 9 10 Treble Control 18 10 1 9 .250 (6.35) .870 (22.1) Max .150 (3.8) .100 (2.54) .800 (20.3) .125 (3.17) Min