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AD8290ACPZ-R7 Datasheet(PDF) 15 Page - Analog Devices

Part # AD8290ACPZ-R7
Description  G = 50, CMOS Sensor Amplifier with Current Excitation
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8290ACPZ-R7 Datasheet(HTML) 15 Page - Analog Devices

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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.
M1
IOUT
VREF = 0.9V
PRECISION CURRENT
MIRROR
CBRIDGE
SENSOR
BRIDGE
RSET
RSET
GND
A1
Figure 44. Current Excitation



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