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SSM2018P Fiches technique(PDF) 16 Page - Analog Devices

No de pièce SSM2018P
Description  Trimless Voltage Controlled Amplifiers
PDF  16 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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SSM2018P Fiches technique(HTML) 16 Page - Analog Devices

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REV. A
–16–
SSM2018T/SSM2118T
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
16-Pin Plastic DIP (N-16) Package
PIN 1
0.280 (7.11)
0.240 (6.10)
9
16
18
0.210
(5.33)
MAX
0.160 (4.06)
0.115 (2.93)
0.022 (0.558)
0.014 (0.356)
0.100 (2.54)
BSC
SEATING
PLANE
0.060 (1.52)
0.015 (0.38)
0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
0.840 (21.33)
0.745 (18.93)
0.325 (8.25)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.115 (2.93)
16-Pin SOIC (R-16) Package
PIN 1
0.2992 (7.60)
0.2914 (7.40)
0.4193 (10.65)
0.3937 (10.00)
1
16
9
8
0.0192 (0.49)
0.0138 (0.35)
0.0500 (1.27)
BSC
0.1043 (2.65)
0.0926 (2.35)
0.4133 (10.50)
0.3977 (10.00)
0.0118 (0.30)
0.0040 (0.10)
0.0500 (1.27)
0.0157 (0.40)
8
°
0
°
0.0291 (0.74)
0.0098 (0.25)
x 45
°
0.0125 (0.32)
0.0091 (0.23)
Voltage Controlled Panner
An interesting circuit that is built with the OVCE building block
is a voltage controlled panner. Figure 48 shows the feedback
connection for the circuit. Notice that the average of both out-
puts is fed back to the input. Thus, the average must be equal
to the input voltage. When the control voltage is set for gain at
VG, this causes V1-G to attenuate (to keep the average the same).
On the other hand, when VG is attenuated, V1-G is amplified.
The result is that the control voltage causes the input to “pan”
from one output to the other. The following expressions show
how this circuit works mathematically:
V
G = 2 K × V IN and V I –G = 2(1 – K ) × V IN
where K varies between 0 and 1 as the control voltage is
changed from full attenuation to full gain respectively. When
VC = 0, then K = 0.5 and VG = V1-G = VIN. Again, trimming is
required for best performance. Pin 9 should be grounded. This
is possible because the feedback is constant and the adaptive
network is not needed. The VCP is the only application shown
in this data sheet where Pin 9 is grounded.
VIN
VC
VG
V1–G
18k
Ω
18k
Ω
Figure 48. Basic VCP Connection
OBSOLETE



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