MAX4524C Просмотр технического описания (PDF) - Maxim Integrated
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MAX4524C Datasheet PDF : 14 Pages
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Low-Voltage, Single-Supply
Multiplexer and Switch
__________Applications Information
Power-Supply Considerations
The MAX4524/MAX4525’s construction is typical of
most CMOS analog switches. They have two supply
pins: V+ and GND. V+ and GND are used to drive the
internal CMOS switches and set the limits of the analog
voltage on any switch. Reverse ESD-protection diodes
are internally connected between each analog signal
pin and both V+ and GND. If any analog signal
exceeds V+ or GND, one of these diodes will conduct.
During normal operation, these (and other) reverse-
biased ESD diodes leak, forming the only current drawn
from V+ or GND.
Virtually all the analog leakage current comes from the
ESD diodes. Although the ESD diodes on a given sig-
nal pin are identical, and therefore fairly well balanced,
they are reverse-biased differently. Each is biased by
either V+ or GND and the analog signal. This means
that leakage will vary as the signal varies. The differ-
ence in the two diode leakages to the V+ and GND
pins constitutes the analog signal-path leakage current.
All analog leakage current flows between each pin and
one of the supply terminals, not to the other switch ter-
minal. This is why both sides of a given switch can
show leakage currents of either the same or opposite
polarity.
______________________________________________Test Circuits/Timing Diagrams
V+
VADD
V+
ADDA
NO0
V+
ADDB
50Ω
NO1–NO2
MAX4524 NO3
INH
COM
GND
300Ω
VOUT
35pF
V+
VADD
V+
ADD
NO
50Ω
MAX4525 NC
V+
INH
COM
GND
300Ω
VOUT
35pF
V+
VADD
0V
VNO0
VOUT
0V
tTRANS
V+
VADD
0V
VNC
VOUT
0V
tTRANS
50%
90%
50%
90%
90%
tTRANS
90%
tTRANS
REPEAT TEST FOR EACH SECTION.
Figure 1. Address Transition Time
_______________________________________________________________________________________ 7
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