MAX399MJE Ver la hoja de datos (PDF) - Maxim Integrated
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MAX399MJE Datasheet PDF : 12 Pages
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Precision, 8-Channel/Dual 4-Channel,
Low-Voltage, CMOS Analog Multiplexers
__________Applications Information
Operation with Supply Voltages
Other than ±5V
Using supply voltages less than ±5V reduces the analog
signal range. The MAX398/MAX399 muxes operate with
±3V to ±8V bipolar supplies or with a +3V to +15V single
supply. Connect V- to GND when operating with a single
supply. Both device types can also operate with unbal-
anced supplies, such as +10V and -5V. The Typical
Operating Characteristics graphs show typical on-resis-
tance with ±3V, ±5V, +3V and +5V supplies. (Switching
times increase by a factor of two or more for operation at
5V.)
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings can cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs, NO, or COM. If power-supply sequencing
is not possible, add two small signal diodes (D1, D2) in
series with supply pins for overvoltage protection
(Figure 1). Adding diodes reduces the analog signal
range to one diode drop below V+ and one diode drop
+5V
D1
V+
MAX398
MAX399
*
*
COM
NO
*
*
V-
D2
-5V * INTERNAL PROTECTION DIODES
Figure 1. Overvoltage Protection Using External Blocking Diodes
above V-, but does not affect the devices’ low switch
resistance and low leakage characteristics. Device
operation is unchanged, and the difference between
V+ and V- should not exceed 17V. These protection
diodes are not recommended when using a single supply.
______________________________________________Test Circuits/Timing Diagrams
+5V
V+
A2
NO1
+5V
A1
NO2-NO7
A0
MAX398 NO8
-5V
VEN EN
COM
GND
50Ω
V-
300Ω
+5V -5V
V+
A1
NO1B
+5V
A0
NO1A-NO4A
NO4B
-5V
VEN EN
MAX399
COMB
GND
V-
50Ω
300Ω
-5V
VOUT
35pF
VOUT
35pF
LOGIC +3V
INPUT
VEN
0V
VNO1
SWITCH
OUTPUT
VOUT 0V
VNO8
tTRANS
ON
50%
90%
tR < 20ns
tF < 20ns
90%
tTRANS
Figure 2. Transition Time
8 _______________________________________________________________________________________
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