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LM1036 Dual DC Operated Tone/Volume/Balance Circuit Literature Number: SNAS525B
February 25, 2008 LM1036 Dual DC Operated Tone/Volume/Balance Circuit General Description The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of the bass, treble, balance and volume functions through application of DC voltages from a remote control system or, alternatively, from four poten- tiometers which may be biased from a zener regulated supply provided on the circuit. Each tone response is defined by a single capacitor chosen to give the desired characteristic.
Features
■ Wide supply voltage range, 9V to 16V ■ Large volume control range, 75 dB typical ■ Tone control, ±15 dB typical ■ Channel separation, 75 dB typical ■ Low distortion, 0.06% typical for an input level of 0.3 Vrms ■ High signal to noise, 80 dB typical for an input level of 0.3 Vrms ■ Few external components required Block and Connection Diagram Dual-In-Line (DIP) and Small Outline (SO) Package 514201 Order Number LM1036N, LM1036M or LM1036MX See NS Package Number N20A or M20B © 2008 National Semiconductor Corporation 5142 www.national.com LM1036 Dual DC Operated Tone/Volume/Balance Circuit
Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 16V Control Pin Voltage (Pins 4, 7, 9, 12, 14) VCC Operating Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Power Dissipation 1W Lead Temp. (Soldering, 10 seconds) 260°C Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits.
Electrical Characteristics
VCC=12V, TA=25°C (unless otherwise stated) Parameter Conditions Min Typ Max Units Supply Voltage Range Pin 11 9 16 V Supply Current 35 45 mA Zener Regulated Output Pin 17 Voltage 5.4 V Current 5 mA Maximum Output Voltage Pins 8, 13; f=1 kHz VCC=9V, Maximum Gain 0.8 Vrms VCC=12V 0.8 1.0 Vrms Maximum Input Voltage Pins 2, 19; f=1 kHz, VCC 2V 1.3 1.6 Vrms Gain=−10 dB Input Resistance Pins 2, 19; f=1 kHz 20 30 kΩ Output Resistance Pins 8, 13; f=1 kHz 20 Ω Maximum Gain V(Pin 12)=V(Pin 17); f=1 kHz −2 0 2 dB Volume Control Range f=1 kHz 70 75 dB Gain Tracking f=1 kHz Channel 1–Channel 2 0 dB through −40 dB 1 3 dB −40 dB through −60 dB 2 dB Balance Control Range Pins 8, 13; f=1 kHz 1 dB −26 −20 dB Bass Control Range f=40 Hz, Cb=0.39 μF (Note 3) V(Pin 14)=V(Pin 17) 12 15 18 dB V(Pin 14)=0V −12 −15 −18 dB Treble Control Range f= 16 kHz, Ct,=0.01 μF (Note 3) V(Pin 4)=V(Pin 17) 12 15 18 dB V(Pin 4)=0V −12 −15 −18 dB Total Harmonic Distortion f=1 kHz, VIN=0.3 Vrms Gain=0 dB 0.06 0.3 % Gain=−30 dB 0.03 % Channel Separation f=1 kHz, Maximum Gain 60 75 dB Signal/Noise Ratio Unweighted 100 Hz–20 kHz 80 dB Maximum Gain, 0 dB=0.3 Vrms CCIR/ARM (Note 4) Gain=0 dB, VIN=0.3 Vrms 75 79 dB Gain=−20 dB, VIN=1.0 Vrms 72 dB Output Noise Voltage at CCIR/ARM (Note 4) 10 16 μV Minimum Gain Supply Ripple Rejection 200 mVrms, 1 kHz Ripple 35 50 dB Control Input Currents Pins 4, 7, 9, 12, 14 (V=0V) −0.6 −2.5 μA Frequency Response −1 dB (Flat Response 250 kHz
20 Hz–16 kHz)
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Note 2: The maximum permissible input level is dependent on tone and volume settings. See Application Notes. Note 3: The tone control range is defined by capacitors Cb and Ct. See Application Notes. Note 4: Gaussian noise, measured over a period of 50 ms per channel, with a CCIR filter referenced to 2 kHz and an average-responding meter. Typical Performance Characteristics Volume Control Characteristics 514220 Balance Control Characteristic 514221 Tone Control Characteristic 514222 Tone Characteristic (Gain vs Frequency) 514223 Tone Characteristic (Gain vs Frequency) 514224 Loudness Compensated Volume Characteristic 514225 3 www.national.com LM1036
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The maximum boost and cut can be optimized for individual applications by selection of the appropriate values of Ct (tre- ble) and Cb (bass). The tone responses are defined by the relationships: Where ab=at=0 for maximum bass and treble boost respec- tively and ab=at=1 for maximum cut. For the values of Cb and Ct of 0.39 μF and 0.01 μF as shown in the Application Circuit, 15 dB of boost or cut is obtained at 40 Hz and 16 kHz. ZENER VOLTAGE A zener voltage (pin 17=5.4V) is provided which may be used to bias the control potentiometers. Setting a DC level of one half of the zener voltage on the control inputs, pins 4, 9, and 14, results in the balanced gain and flat response condition. Typical spread on the zener voltage is ±100 mV and this must be taken into account if control signals are used which are not referenced to the zener voltage. If this is the case, then they will need to be derived with similar accuracy. LOUDNESS COMPENSATION A simple loudness compensation may be effected by applying a DC control voltage to pin 7. This operates on the tone control stages to produce an additional boost limited by the maximum boost defined by C b and C t. There is no loudness compen- sation when pin 7 is connected to pin 17. Pin 7 can be connected to pin 12 to give the loudness compensated vol- ume characteristic as illustrated without the addition of further external components. (Tone settings are for flat response, Cb and Ct as given in Application Circuit.) Modification to the loudness characteristic is possible by changing the capacitors Cb and Ct for a different basic response or, by a resistor net- work between pins 7 and 12 for a different threshold and slope. SIGNAL HANDLING The volume control function of the LM1036 is carried out in two stages, controlled by the DC voltage on pin 12, to improve signal handling capability and provide a reduction of output noise level at reduced gain. The first stage is before the tone control processing and provides an initial 15 dB of gain re- duction, so ensuring that the tone sections are not overdriven by large input levels when operating with a low volume setting. Any combination of tone and volume settings may be used provided the output level does not exceed 1 Vrms, VCC=12V (0.8 Vrms, VCC=9V). At reduced gain (<−6 dB)the input stage will overload if the input level exceeds 1.6 Vrms, VCC=12V (1.1 Vrms, VCC=9V). As there is volume control on the input stages, the inputs may be operated with a lower overload margin than would otherwise be acceptable, allowing a pos- sible improvement in signal to noise ratio. Application Circuit 514203 5 www.national.com LM1036
Simplified Schematic Diagram (One Channel) 514219 *Connections reversed www.national.com 10 LM1036
Physical Dimensions inches (millimeters) unless otherwise noted Molded Dual-In-Line Package (N) Order Number LM1036N Small Outline (SO) Package Order Number LM1036M or LM1036MX 11 www.national.com LM1036
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