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+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
V CC
0.1 μ F
V CC
0.1 μ F
V CC
0.1 μ F
V CC
V CC
V CC
DIN
DIN
DOUT
DIN
DOUT
DIN
DOUT
MAX4823 OUT1
MAX4823 OUT1
MAX4823 OUT1
SCLK
SCLK
OUT8
SCLK
SCLK
OUT8
SCLK
SCLK
OUT8
CS
GND
PGND
CS
GND
PGND
CS
GND
PGND
CS
Figure 8. Daisy-Chain Configuration
V CC
0.1 μ F
V CC
0.1 μ F
V CC
0.1 μ F
V CC
V CC
V CC
DIN
DIN
DOUT
DIN
DOUT
DIN
DOUT
PSAVE
MAX4822 OUT1
PSAVE
MAX4822 OUT1
PSAVE
MAX4822 OUT1
0.47 μ F
SCLK
OUT8
0.47 μ F
SCLK
OUT8
0.47 μ F
SCLK
OUT8
CS
GND
PGND
CS
GND
PGND
CS
GND
PGND
SCLK
CS
Figure 9. Daisy-Chained MAX4822s with a Capacitor Connected to PSAVE
where N is the total number of MAX4822 devices in a
single chain, and R ON is the on-resistance of the
n-channel MOSFET in ? s.
For example, if N = 10:
R ON < 142 ?
An n-channel MOSFET with R ON less than 142 ? is
required for a daisy chain of 10 MAX4822 devices.
Inductive Kickback Protection with
Fast Recovery Time
The MAX4822–MAX4825 feature built-in inductive kick-
back protection to reduce the voltage spike on OUT_
generated by a relay’s coil inductance when the output
is suddenly switched off. An internal Zener clamp
allows the inductor current to flow back to ground. The
Zener configuration significantly reduces the recovery
time (time it takes to turn off the relay) when compared
to protection configurations with just one diode across
the coil.
14
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