LM1036.PDF

January 1995

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 loud-

ness compensation to be simply effected.

Four control inputs provide control of the bass, treble, bal-

ance and volume functions through application of DC volt-

ages from a remote control system or, alternatively, from four

potentiometers 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

n Wide supply voltage range, 9V to 16V

n Large volume control range, 75 dB typical

n Tone control, ± 15 dB typical

n Channel separation, 75 dB typical

n Low distortion, 0.06% typical for an input level of 0.3

Vrms

n High signal to noise, 80 dB typical for an input level of

0.3 Vrms

n Few external components required

Block and Connection Diagram

Dual-In-Line Package

DS005142-1

Order Number LM1036N

See NS Package Number N20A

DS005142

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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

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.

Control Pin Voltage (Pins 4, 7, 9, 12, 14)

V CC

Operating Temperature Range

0˚C to +70˚C

Electrical Characteristics

V CC = 12V, T A = 25˚C (unless otherwise stated)

Parameter

Conditions

Min

Typ

Max

Units

Supply Voltage Range

Pin 11

Supply Current

Zener Regulated Output

Pin 17

Voltage

5.4

Current

Maximum Output Voltage

Pins 8, 13; f = 1 kHz

V CC = 9V, Maximum Gain

0.8

Vrms

V CC =12V

0.8

1.0

Vrms

Maximum Input Voltage

Pins 2, 19; f=1 kHz, V CC 2V

1.3

1.6

Vrms

Gain=−10 dB

Input Resistance

Pins 2, 19; f=1 kHz

Output Resistance

Pins 8, 13; f=1 kHz

Maximum Gain

V(Pin 12)=V(Pin 17); f=1 kHz

−2

Volume Control Range

f=1 kHz

Gain Tracking

f=1 kHz

Channel 1–Channel 2

0 dB through −40 dB

−40 dB through −60 dB

Balance Control Range

Pins 8, 13; f=1 kHz

−26

−20

Bass Control Range

f = 40 Hz, C b =0.39 µF

(Note 3)

V(Pin 14) = V(Pin 17)

V(Pin 14) = 0V

−12

−15

−18

Treble Control Range

f = 16 kHz, C t , = 0.01 µF

(Note 3)

V(Pin 4) = V(Pin 17)

V(Pin 4) = 0V

−12

−15

−18

Total Harmonic Distortion

f = 1 kHz, V IN = 0.3 Vrms

Gain = 0 dB

0.06

0.3

Gain = −30 dB

0.03

Channel Separation

f = 1 kHz, Maximum Gain

Signal/Noise Ratio

Unweighted 100 Hz–20 kHz

Maximum Gain, 0 dB = 0.3 Vrms

CCIR/ARM (Note 4)

Gain = 0 dB, V IN = 0.3 Vrms

Gain = −20 dB, V IN = 1.0 Vrms

Output Noise Voltage at

CCIR/ARM (Note 4)

µV

Minimum Gain

Supply Ripple Rejection

200 mVrms, 1 kHz Ripple

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)

Note 2: The maximum permissible input level is dependent on tone and volume settings. See Application Notes.

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Electrical Characteristics (Continued)

Note 3: The tone control range is defined by capacitors C b and C t . 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

Balance Control

Characteristic

Tone Control Characteristic

DS005142-22

DS005142-20

DS005142-21

Tone Characteristic (Gain

vs Frequency)

Tone Characteristic (Gain

vs Frequency)

Loudness Compensated

Volume Characteristic

DS005142-23

DS005142-24

DS005142-25

Input Signal Handling vs

Supply Voltage

THD vs Gain

Channel Separation vs

Frequency

DS005142-27

DS005142-28

DS005142-26

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Typical Performance Characteristics (Continued)

Loudness Control

Characteristic

Output Noise Voltage

vs Gain

THD vs Input Voltage

DS005142-31

DS005142-29

DS005142-30

Application Notes

TONE RESPONSE

The maximum boost and cut can be optimized for individual

applications by selection of the appropriate values of C t

(treble) and C b (bass).

The tone responses are defined by the relationships:

maximum boost defined by C b and C t . There is no loudness

compensation when pin 7 is connected to pin 17. Pin 7 can

be connected to pin 12 to give the loudness compensated

volume characteristic as illustrated without the addition of

further external components. (Tone settings are for flat re-

sponse, C b and C t as given in Application Circuit.) Modifica-

tion to the loudness characteristic is possible by changing

the capacitors C b and C t for a different basic response or, by

a resistor network between pins 7 and 12 for a different

threshold and slope.

Where a b =a t =0 for maximum bass and treble boost respec-

tively and a b = a t = 1 for maximum cut.

For the values of C b and C t 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.

SIGNAL HANDLING

The volume control function of the LM1036 is carried out in

two stages, controlled by the DC voltage on pin 12, to im-

prove 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 reduction, 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, V CC = 12V (0.8 Vrms, V CC = 9V). At reduced gain

( < −6 dB)the input stage will overload if the input level ex-

ceeds 1.6 Vrms, V CC = 12V (1.1 Vrms, V CC = 9V). As there is

volume control on the input stages, the inputs may be oper-

ated with a lower overload margin than would otherwise be

acceptable, allowing a possible improvement in signal to

noise ratio.

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 condi-

tion. 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 apply-

ing a DC control voltage to pin 7. This operates on the tone

control stages to produce an additional boost limited by the

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Application Circuit

DS005142-3

Applications Information

OBTAINING MODIFIED RESPONSE CURVES

The LM1036 is a dual DC controlled bass, treble, balance

and volume integrated circuit ideal for stereo audio systems.

In the various applications where the LM1036 can be used,

there may be requirements for responses different to those

of the standard application circuit given in the data sheet.

This application section details some of the simple variations

possible on the standard responses, to assist the choice of

optimum characteristics for particular applications.

Figure 2 and Figure 3 show the effect of changing the re-

sponse defining capacitors C t and C b to 2Ct, C b /2 and 4C t ,

C b /4 respectively, giving increased tone control ranges. The

values of the bypass capacitors may become significant and

affect the lower frequencies in the bass response curves.

TONE CONTROLS

Summarizing the relationship given in the data sheet, basi-

cally for an increase in the treble control range C t must be in-

creased, and for increased bass range C b must be reduced.

Figure 1 shows the typical tone response obtained in the

standard application circuit. (C t = 0.01 µF, C b = 0.39 µF). Re-

sponse curves are given for various amounts of boost and

cut.

DS005142-5

FIGURE 2. Tone Characteristic (Gain vs Frequency)

DS005142-4

FIGURE 1. Tone Characteristic (Gain vs Frequency)

DS005142-6

FIGURE 3. Tone Characteristic (Gain vs Frequency)

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