AD8290ACPZ-R21 datasheet(16/21 Pages) AD

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AD8290ACPZ-R21 数据表(PDF) 16 Page - Analog Devices

部件名	AD8290ACPZ-R21

功能描述	G = 50, CMOS Sensor Amplifier with Current Excitation

PDF	21 Pages

Scroll/Zoom	100%

制造商	AD [Analog Devices]

网页	http://www.analog.com

标志

16 / 21 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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