LM13700M National Semiconductor, LM13700M Datasheet - Page 7

• Manufacturer Part Number: LM13700M
• Description: Operational Amplifier (Op-Amp) IC
• Manufacturer: National Semiconductor

Specifications of LM13700M

• No. Of Amplifiers: 2
• No. Of Pins: 16
• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Package / Case: 16-NSOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Applications:
Voltage Controlled Amplifiers
maximizes their linearizing action when balanced against
R
cific application demands otherwise.
Stereo Volume Control
The circuit of Figure 4 uses the excellent matching of the two
LM13700 amplifiers to provide a Stereo Volume Control with
a typical channel-to-channel gain tracking of 0.3 dB. R
provided to minimize the output offset voltage and may be
replaced with two 510 resistors in AC-coupled applications.
For the component values given, amplifier gain is derived for
Figure 2 as being:
(Continued)
IN
. A value of 1 mA is recommended for I
FIGURE 3. Equivalent VCA Input Circuit
D
FIGURE 2. Voltage Controlled Amplifier
unless the spe-
P
is
7
If V
becomes an amplitude modulator or two-quadrant multiplier
as shown in Figure 5 , where:
The constant term in the above equation may be cancelled
by feeding I
ure 6 adds R
four-quadrant multiplier where R
0V for V
C
is derived from a second signal source then the circuit
IN2
S
= 0V. R
x I
M
D
R
to provide this current, resulting in a
C
M
/2(V− + 1.4V) into I
also serves as the load resistor for I
DS007981-10
C
DS007981-9
is trimmed such that V
O
. The circuit of Fig-
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O
O
=
.