SSM2018TS datasheet(16/16 Pages) AD

16 / 16 page

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)

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)

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)

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:

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

V1–G

18k

Ω

18k

Ω

Figure 48. Basic VCP Connection

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