LM13700MX National Semiconductor, LM13700MX Datasheet - Page 9

• Manufacturer Part Number: LM13700MX
• Description: IC,Operational Amplifier,DUAL,BIPOLAR,SOP,16PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LM13700MX

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Applications
Voltage Controlled Amplifiers
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 510Ω resistors in AC-coupled applications.
For the component values given, amplifier gain is derived for
Figure 2 as being:
FIGURE 3. Equivalent VCA Input Circuit
(Continued)
P
is
9
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
Figure 6 adds R
four-quadrant multiplier where R
0V for V
C
is derived from a second signal source then the circuit
IN2
= 0V. R
S
x I
D
M
R
M
to provide this current, resulting in a
C
also serves as the load resistor for I
/2(V− + 1.4V) into I
C
00798110
is trimmed such that V
O
. The circuit of
www.national.com
O
O
=
.