ADG714 datasheet(19/21 Pages) AD

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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 VDD and VSS supplies, the addition of

a Schottky diode connected between VSS and GND ensures that

the devices power on correctly. For single-supply operation, VSS

is tied to GND as close to the devices as possible.

SDA

SCL

ADG715

SDA

SCL

ADG715

SDA

SCL

ADG715

SDA

SCL

ADG715

SDA

SCL

MASTER

VDD

Figure 27. Multiple ADG715 Devices on One Bus

SCLK

DIN

DOUT

ADG714

SYNC

OTHER

SERIAL

DEVICES

SCLK

DIN

SYNC

SCLK

DIN

DOUT

ADG714

SYNC

SCLK

DIN

DOUT

ADG714

SYNC

VDD

Figure 28. Multiple ADG714 Devices in a Daisy-Chained Configuration

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