MUX508 Datasheet, PDF (15/37 Pages) Texas Instruments – Low-Capacitance, Low-Charge-Injection, Precision, Analog Multiplexers

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MUX508, MUX509
SBAS758A – JANUARY 2016 – REVISED MARCH 2016
8.2 On-Resistance
The on-resistance of the MUX50x is the ohmic resistance across the source (Sx, SxA, or SxB) and drain (D, DA,
or DB) pins of the device. The on-resistance varies with input voltage and supply voltage. The symbol R_ON is
used to denote on-resistance. The measurement setup used to measure R_ON is shown in Figure 26. Voltage (V)
and current (I_CH) are measured using this setup, and R_ON is computed as shown in Equation 1.
V
S
D
ICH
VS
Figure 26. On-Resistance Measurement Setup
R_ON = V / I_CH
(1)
8.3 Off-Leakage Current
There are two types of leakage currents associated with a switch during the off state:
1. Source off-leakage current
2. Drain off-leakage current
Source off-leakage current is defined as the leakage current flowing into or out of the source pin when the switch
is off. It is denoted by the symbol I_S(OFF).
Drain off-leakage current is defined as the leakage current flowing into or out of the drain pin when the switch is
off. It is denoted by the symbol I_D(OFF).
The setup used to measure both types of off-leakage currents is shown in Figure 27
Is (OFF)
S
A
ID (OFF)
D
A
VS
VD
Figure 27. Off-Leakage Measurement Setup
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