DG381B Datasheet, PDF (8/9 Pages) Vishay Siliconix – CMOS Analog Switches

DG381B/384B/387B/390B
Vishay Siliconix
APPLICATIONS
The DG381B series of analog switches will switch positive
analog signals while using a single positive supply. This allows
their use in applications where only one supply is available.
The trade-offs or performance given up while using single
supplies are: 1) increased r_DS(on), 2) slower switching speed.
Typical curves for aid in designing with single supplies are
supplied (see Typical Characteristics). The analog voltage
should not go above or below the supply voltages which in
single operation are V+ and 0 V.
In the integrator of Figure 4, R_D controls the discharge rate of
the capacitor so that the pulsed or continuous current ratings
are not exceeded. During reset SW₁ is closed and SW₂ is
open. Opening SW₂ with SW₁ also open will hold the integrator
output at its present value.
Reset
V_IN
Start/Stop
SW₁
SW₂
DG381B
R_D
C
R
–
+
R
ŕ ¹
V_O + _RC V_IN ·Ădt
FIGURE 5. Integrator with Reset and Start/Stop
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Document Number: 71404
S-02968—Rev. A, 22-Jan-01