AD8290ACPZ-R2 datasheet(15/20 Pages) AD

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AD8290ACPZ-R2 データシート(PDF) 15 Page - Analog Devices

部品番号	AD8290ACPZ-R2

部品情報	G = 50, CMOS Sensor Amplifier with Current Excitation

PDF	20 Pages

Scroll/Zoom	100%

メーカー	AD [Analog Devices]

ホームページ	http://www.analog.com

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15 / 20 page

AD8290

Rev. B | Page 15 of 20

CURRENT SOURCE

The AD8290 generates an excitation current that is

programmable with an external resistor, RSET, as shown in

Figure 44. A1 and M1 are configured to produce 0.9 V across

RSET, which is based on an internal 0.9 V reference and creates a

current equal to 0.9 V/RSET internal to the AD8290. This current

is passed to a precision current mirror and a replica of the current

is sourced from the IOUT pin. This current can be used for the

excitation of a sensor bridge. CBRIDGE is used to filter noise from

the current excitation circuit.

IOUT

VREF = 0.9V

PRECISION CURRENT

MIRROR

CBRIDGE

SENSOR

BRIDGE

RSET

GND

Figure 44. Current Excitation

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