MUX508 Datasheet, PDF (20/37 Pages) Texas Instruments – Low-Capacitance, Low-Charge-Injection, Precision, Analog Multiplexers

MUX508, MUX509
SBAS758A – JANUARY 2016 – REVISED MARCH 2016
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8.9 Off Isolation
Off isolation is defined as the voltage at the drain pin (D, DA, or DB) of the MUX50x when a 1-V_RMS signal is
applied to the source pin (Sx, SxA, or SxB) of an off-channel. Figure 33 shows the setup used to measure off
isolation. Use Equation 2 to compute off isolation.
VDD
0.1 µF
VSS
0.1 µF
VDD
S
VSS
50 Ÿ
Network Analyzer
50
VS
D
GND
VOUT
RL
50 Ÿ
Figure 33. Off Isolation Measurement Setup
Off Isolation
20
˜
§
Log_¨
V_OUT
·
¸
© ^VS ¹
(2)
8.10 Channel-to-Channel Crosstalk
Channel-to-channel crosstalk is defined as the voltage at the source pin (Sx, SxA, or SxB) of an off-channel,
when a 1-V_RMS signal is applied at the source pin of an on-channel. Figure 34 shows the setup used to measure,
and Equation 3 is the equation used to compute, channel-to-channel crosstalk.
VDD
0.1 µF
VSS
0.1 µF
Network Analyzer
VOUT
RL
50 Ÿ
VS
VDD
VSS
S1
S2
GND
R
50 Ÿ
Figure 34. Channel-to-Channel Crosstalk Measurement Setup
Channel-to-Channel Crosstalk
20
˜
§
Log_¨
V_OUT
·
¸
© ^VS ¹
(3)
20
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