TMUX1111 datasheet(20/44 Pages) TI2

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7.7 Off isolation

Off isolation is defined as the ratio of the signal at the drain pin (Dx) of the device when a signal is applied to

the source pin (Sx) of an off-channel. The characteristic impedance, Z0, for the measurement is 50Ω. Figure 7-7

shows the setup used to measure off isolation. Use off isolation equation to compute off isolation.

GND

NETWORK

ANALYZER

VOUT

50Ÿ

VSIG

50Ÿ

SX/DX

50Ÿ

VDD

0.1µF

Figure 7-7. Off Isolation Measurement Setup

OUT

Off Isolation

20 Log

(1)

7.8 Channel-to-Channel Crosstalk

Crosstalk is defined as the ratio of the signal at the drain pin (Dx) of a different channel, when a signal is applied

at the source pin (Sx) of an on-channel. The characteristic impedance, Z0, for the measurement is 50Ω. Figure

7-8 shows the setup used to measure, and the equation used to compute crosstalk.

NETWORK

ANALYZER

VDD

0.1µF

VDD

GND

VSIG = 200 mVpp

VBIAS = VDD / 2

50Ÿ

VOUT

50Ÿ

SX / DX

50Ÿ

Figure 7-8. Channel-to-Channel Crosstalk Measurement Setup

TMUX1111, TMUX1112, TMUX1113

SCDS408C – FEBRUARY 2019 – REVISED DECEMBER 2023

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