MAX4634EUB Просмотр технического описания (PDF) - Maxim Integrated
Номер в каталоге
Компоненты Описание
Список матч
MAX4634EUB Datasheet PDF : 10 Pages
| |||
Fast, Low-Voltage, 4Ω,
4-Channel CMOS Analog Multiplexer
PIN
µMAX/
TDFN
1
2
3
4
5
6
7
8
9
10
—
Pin Description
NAME
FUNCTION
A0
NO1
GND
NO3
EN
V+
NO4
COM
NO2
A1
EP
Address Input. See the Truth Table
for details.
Normally Open Switch 1
Ground
Normally Open Switch 3
Enable Logic Input. See the Truth
Table for details.
Positive Supply Voltage. Connect
to an external power supply.
Bypass to GND with a 10µF
capacitor placed as close to the
pin as possible.
Normally Open Switch 4
Analog Switch Common Terminal
Normally Open Switch 2
Address Input. See the Truth Table
for details.
Exposed Pad. Internally connected
to GND. Connect to a large PCB
ground plane for proper operation.
Not intended as an electrical
connection point (TDFN package
only).
Detailed Description
The MAX4634 is a low-on-resistance, low-voltage ana-
log multiplexer that operates from a +1.8V to +5.5V sin-
gle supply. CMOS switch construction allows pro-
cessing of analog signals that are within the supply volt-
age range (GND to V+).
To disable all switch channels, drive EN low. All four inputs
and COM become high impedance during this state. If the
disable feature is not needed, connect EN to V+.
+5V
D1
V+
MAX4634
*
*
COM
NO
*
*
D2
GND
*INTERNAL PROTECTION DIODES
Figure 1. Overvoltage Protection Using External Blocking Diodes
Applications Information
Power-Supply Sequencing and
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Always apply V+ before applying
analog signals or logic inputs, especially if the analog or
logic signals are not current limited. If this sequencing is
not possible, and if the analog or logic inputs are not
current limited to < 20mA, add a small-signal diode
(D1) as shown in Figure 1. If the analog signal can dip
below GND, add D2. Adding protection diodes reduces
the analog signal range to a diode drop (about 0.7V)
below V+ for D1 or to a diode drop above ground for D2.
The addition of diodes does not affect leakage. On-resis-
tance increases by a small amount at low supply voltages.
Maximum supply voltage (V+) must not exceed 6V.
Protection diodes D1 and D2 also protect against some
overvoltage situations. A fault voltage up to the
absolute maximum rating at an analog signal input
does not damage the device, even if the supply voltage
is below the signal voltage.
_______________________________________________________________________________________ 7
Share Link: 