Datasheet
Data Sheet ADG714/ADG715
Rev. E | Page 19 of 21
APPLICATIONS INFORMATION
MULTIPLE DEVICES ON ONE BUS
Figure 27 shows four ADG715 devices on the same serial bus.
Each has a different slave address because the state of the A0
and A1 pins is different. This difference allows each switch to be
written to or read from independently.
DAISY-CHAINING MULTIPLE ADG714 DEVICES
A number of ADG714 switches can be daisy-chained simply by
using the DOUT pin. Figure 28 shows a typical implementation.
The
SYNC
pin of all three devices in the example are tied
together. When
SYNC
is brought low, the input shift registers of
all devices are enabled, data is written to the devices via DIN
and clocked through the shift registers. When the transfer is
complete,
SYNC
is brought high, and all switches are updated
simultaneously. Further shift registers may be added in a series.
POWER SUPPLY SEQUENCING
When using CMOS devices, take care to ensure correct power
supply sequencing. Incorrect power supply sequencing can
result in the devices being subjected to stresses beyond the
absolute maximum ratings listed in Table 6. Digital and analog
inputs are always applied after power supplies and ground. In
dual-supply applications, if digital or analog inputs are applied
to the devices prior to the V
DD
and V
SS
supplies, the addition of
a Schottky diode connected between V
SS
and GND ensures that
the devices power on correctly. For single-supply operation, V
SS
is tied to GND as close to the devices as possible.
SDA SCL
A1
A0
A1
A0
A1
A0
A1
A0
ADG715
SDA SCL
ADG715
SDA SCL
ADG715
SDA SCL
ADG715
SDA
SCL
MASTER
R
P
R
P
V
DD
V
DD
V
DD
V
DD
00043-026
Figure 27. Multiple ADG715 Devices on One Bus
SCLK
DIN
DOUT
ADG714
SYNC
TO
OTHER
SERIAL
DEVICES
SCLK
DIN
SYNC
SCLK
DIN
DOUT
ADG714
SYNC
SCLK
DIN
DOUT
ADG714
SYNC
V
DD
V
DD
V
DD
R R R
00043-027
Figure 28. Multiple ADG714 Devices in a Daisy-Chained Configuration
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