MAX14759 Maxim, MAX14759 Datasheet - Page 11

• Manufacturer Part Number: MAX14759
• Description: The MAX14759/MAX14761/MAX14763 analog switches are capable of passing bipolar signals that are beyond their supply rails
• Manufacturer: Maxim

The MAX14759/MAX14761/MAX14763 are analog switches
capable of handling signals above and below their rails.
These devices operate from a single +3.0V to +5.5V sup-
ply and support signals in the -25V to +25V range. The
low on-resistance and high bandwidth allow for use in
digital- and analog-signal switching applications.
The devices switch signals in the range from -25V to +25V
that are above and below their rails. The on-resistance for
these devices exhibit a high degree of flatness of 2.4mI
(MAX14759 typ) and 5.1mI (MAX14761/MAX14763 typ)
over the whole input voltage range of -25V to +25V. The
analog switches allow bidirectional current flow, so A, A1,
A2, B, B1, B2, and COM can be used as either inputs or
outputs.
Bias stabilizing capacitors are required on the V
pins. 1FF ceramic capacitors are suggested for effective
operation. V
for other circuitry.
MAX14759 MAX14761 MAX14763
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P
and V
PIN
10
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—
3
6
5
9
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N
are not intended as a power supply
Detailed Description
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5
8
Analog Signal Range
Bypass Capacitors
Low On-Resistance Analog Switches
NAME
EN1
EN2
SEL
B1
A2
B2
EP
MAX14759/MAX14761/MAX14763
Analog Switch 1 Common Terminal
Analog Switch 2 Normally Open Terminal
Analog Switch 2 Common Terminal
Switch 1 Control Input. Drive EN1 high to open switch 1 or drive EN1 low to
close switch 1.
Switch 2 Control Input. Drive EN2 high to close switch 2 or drive EN2 low to
open switch 2.
Switch Control Input. Drive SEL low to connect the COM terminal to A1 or drive
SEL high to connect the COM terminal to A2.
Exposed Pad. Internally connected to V
connection. Leave exposed pad unconnected.
P
and V
Above- and Below-the-Rails
N
Ensure that negative signals are not present on the A_,
B_, or COM inputs until 1 second has passed after apply-
ing V
The MAX14759 can be used to switch a differential termi-
nation resistor in or out. In RS-485 and CAN applications,
both ends of high-speed transmission lines require ter-
mination.
and CAN termination using two equal resistors. These
switches support RS)-485’s high -7V to +12V common-
mode range.
In RS-232/RS-485 multiprotocol applications, the
MAX14759 can be used for switching in the line-termi-
nating resistors for RS-485 usage, and can disable the
termination resistor for RS-232 operation, as shown in
Figure
The MAX14761 is ideal for switching in fail-safe biasing
resistors in RS-485 applications, as shown in
and 12.
Differential Termination Resistor Switch
CC
10.
.
Figures 8
Pin Description (continued)
FUNCTION
Applications Information
and
N
; not intended as an electrical
9
show an application of RS-485
Power-Up Conditions
Figures 11