LM1036N/NOPB National Semiconductor, LM1036N/NOPB Datasheet - Page 5

• Manufacturer Part Number: LM1036N/NOPB
• Description: IC TONE/VOL/BAL DUAL DC 20-DIP
• Manufacturer: National Semiconductor
• Type: Tone Volume/Balance Circuitr

Specifications of LM1036N/NOPB

• Applications: Automotive Systems, Players, TV
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• No. Of Channels: 2
• Supply Voltage Range: 9V To 16V
• Load Impedance: 20ohm
• Operating Temperature Range: 0°C To +70°C
• Amplifier Case Style: DIP
• No. Of Pins: 20
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM1036N; *LM1036N/NOPB; LM1036; LM1036N

Application Notes
TONE RESPONSE
The maximum boost and cut can be optimized for individual
applications by selection of the appropriate values of C
ble) and C
The tone responses are defined by the relationships:
Where a
tively and a
For the values of C
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.
Application Circuit
b
=a
b
b
(bass).
t
=a
=0 for maximum bass and treble boost respec-
t
=1 for maximum cut.
b
and C
t
of 0.39 μF and 0.01 μF as shown
t
(tre-
5
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
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,
C
loudness characteristic is possible by changing the capacitors
C
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, V
(0.8 Vrms, V
will overload if the input level exceeds 1.6 Vrms, V
(1.1 Vrms, V
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.
b
b
and C
and C
t
t
as given in Application Circuit.) Modification to the
for a different basic response or, by a resistor net-
CC
CC
=9V). At reduced gain (<−6 dB)the input stage
=9V). As there is volume control on the input
b
and C
t
. There is no loudness compen-
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CC
CC
=12V
=12V