AD8366ACPZ-R7 datasheet(17/28 Pages) AD

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Data Sheet

AD8366

Rev. B | Page 17 of 28

APPLICATIONS INFORMATION

BASIC CONNECTIONS

Figure 50 shows the basic connections for operating the AD8366.

A voltage from 4.75 V to 5.25 V must be applied to the supply

pins. Each supply pin must be decoupled with at least one low

inductance, surface-mount ceramic capacitor of 0.1 µF placed as

close as possible to the device.

The differential input impedance is 200 Ω and sits at a nominal

common-mode voltage of VPOS/2. The inputs can be dc-coupled

or ac-coupled. If using direct dc coupling, the common-mode

voltage, VCM, can range from 1.5 V to VPOS/2.

The output buffers of the AD8366 are low impedance around

25 Ω designed to drive ADC inputs. The output common-mode

voltage defaults to VPOS/2; however, it can be adjusted by applying a

desired external voltage to VCMA/VCMB. The common-mode

voltage can be adjusted from 1.6 V to 3.0 V without significant

harmonic distortion degradation.

To enable the AD8366, the ENBL pin must be pulled high. Taking

ENBL low disables the device, reducing current consumption to

approximately 3 mA at ambient temperature.

VPSIA

IPPA

IPMA

ENBL

ICOM

IPMB

IPPB

VPSIB

BIT0/CS

BIT1/SDAT

BIT2/SCLK

BIT3

OCOM

BIT4

BIT5

DENA

VPOS

AD8366

VPOS

0.01µF

8200pF

0.01µF

VPOS

0.1µF

VPOS

0.1µF

VPOS

0.1µF

CHANNEL A

OUTPUT

CHANNEL B

OUTPUT

CHANNEL A

INPUT

CHANNEL B

INPUT

Figure 50. Basic Connections

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