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TMUX8212 Datasheet(PDF) 19 Page - Texas Instruments

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Part # TMUX8212
Description  TMUX821x 100-V, Flat Ron, 1:1 (SPST), 4-Channel Switches with Latch-Up Immunity and 1.8-V Logic
PDF  32 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMUX8212 Datasheet(HTML) 19 Page - Texas Instruments

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8.5 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 8-5 shows the setup used to measure charge injection from
the source to drain.
VOUT
Output
VS
0 V
3 V
VSELx
QINJ = CL ×
VOUT
tr < 20 ns
tf < 20 ns
S1
GND
D1
S4
D4
SW
SW
GND
VS
GND
VS
GND
CL
GND
CL
Output
Output
VDD
VSS
VDD
VSS
GND
0.1 µF
GND
0.1 µF
SELx
VSELx
Figure 8-5. Charge-Injection Measurement Setup
8.6 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, ZO, for the measurement is 50 Ω. Figure 8-6
shows the setup used to measure off isolation.
SELx
GND
VSELx
SX
Dx
VS
VOUT
RS
SW
50Ÿ
Network Analyzer
1BB +OKH=PEKJ = 20 × .KC
8176
85
VDD
VSS
VDD
VSS
GND
0.1 µF
GND
0.1 µF
50Ÿ
Other
Sx/ Dx
pins
Figure 8-6. Off Isolation Measurement Setup
www.ti.com
TMUX8212
SCDS434A – OCTOBER 2021 – REVISED DECEMBER 2021
Copyright © 2021 Texas Instruments Incorporated
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Product Folder Links: TMUX8212



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