TMUX8108 datasheet(21/37 Pages) TI

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8.7 Charge Injection

Charge injection is a measure of the glitch impulse transferred from the digital input to the analog output during

switching, and is denoted by the symbol QINJ. Figure 8-7 shows the setup used to measure charge injection from

the source to drain.

VOUT

Output

0 V

3 V

VEN

QINJ = CL ×

VOUT

GND

Decoder

GND

VEN

Output

tr < 20 ns

tf < 20 ns

VDD

VSS

VDD

VSS

GND

0.1 µF

GND

0.1 µF

Figure 8-7. Charge-Injection Measurement Setup

8.8 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 for the measurement (ZO) is 50 Ω. Figure 8-8

shows the setup used to measure off isolation.

Ax, EN

GND

VAX

VEN

D/ DX

Other

Sx/ Dx

Pins

VOUT

N.C.

50Ÿ

Network Analyzer

1BB +OKH=PEKJ = 20 × .KC

8176

VDD

VSS

VDD

VSS

GND

0.1 µF

GND

0.1 µF

Figure 8-8. Off Isolation Measurement Setup

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TMUX8108, TMUX8109

SCDS435A – SEPTEMBER 2021 – REVISED DECEMBER 2021

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