MUX506 Datasheet, PDF (23/38 Pages) Texas Instruments – 36-V, Low-Capacitance, Low-Leakage-Current, Precision Analog Multiplexers

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MUX506, MUX507
SBAS803 – NOVEMBER 2016
7.11 Bandwidth
Bandwidth is defined as the range of frequencies that are attenuated by less than 3 dB when the input is applied
to the source pin of an on-channel, and the output 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)
7.12 THD + Noise
The total harmonic distortion (THD) of a signal is a measurement of the harmonic distortion, and 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 THD+N of the MUX50x.
VDD
0.1 µF
VSS
0.1 µF
VDD
VSS
IN
VIN
S
D
GND
Audio Precision
RS
RL
10 NŸ
VOUT
VS
5 VRMS
Figure 36. THD+N Measurement Setup
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