MUX508 Datasheet, PDF (21/37 Pages) Texas Instruments – Low-Capacitance, Low-Charge-Injection, Precision, Analog Multiplexers

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MUX508, MUX509
SBAS758A – JANUARY 2016 – REVISED MARCH 2016
8.11 Bandwidth
Bandwidth is defined as the range of frequencies that are attenuated by < 3 dB when the input is applied to the
source pin of an on-channel and the output is measured at the drain pin of the MUX50x. Figure 35 shows the
setup used to measure bandwidth of the mux. Use Equation 4 to compute the attenuation.
VDD
0.1 µF
VSS
0.1 µF
VDD
VSS
V1
S
D
V2
GND
Network Analyzer
50
VS
RL
50 Ÿ
VOUT
Figure 35. Bandwidth Measurement Setup
Attenuation
20
˜
§
Log_¨
V₂
·
¸
© ^V1 ¹
(4)
8.12 THD + Noise
The total harmonic distortion (THD) of a signal is defined as the ratio of the sum of the powers of all harmonic
components to the power of the fundamental frequency at the mux output. The on-resistance of the MUX50x
varies with the amplitude of the input signal and results in distortion when the drain pin is connected to a low-
impedance load. Total harmonic distortion plus noise is denoted as THD+N. Figure 36 shows the setup used to
measure the THD+N of the MUX50x.
VDD
0.1 µF
VSS
0.1 µF
VDD
IN
VIN
S
D
VSS
GND
Audio Precision
RS
RL
10 NŸ
VOUT
VS
5 Vrms
Figure 36. THD+N Measurement Setup
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