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ADA4177-1ARMZ-R7 датащи(PDF) 25 Page - Analog Devices

номер детали ADA4177-1ARMZ-R7
подробное описание детали  OVP and EMI Protected, Precision, Low Noise and Bias Current Op Amps
PDF  33 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADA4177-1ARMZ-R7 датащи(HTML) 25 Page - Analog Devices

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Data Sheet
ADA4177-1/ADA4177-2/ADA4177-4
Rev. E | Page 25 of 33
THEORY OF OPERATION
The ADA4177-1/ADA4177-2/ADA4177-4 are precision,
bipolar op amps that integrate both input overvoltage protection
(OVP) and input EMI filtering while maintaining a low 2 nA
maximum bias current and a rail-to-rail output operation.
Figure 84 shows a conceptual schematic of the main amplifier
that uses super beta, bipolar input transistors and bias current
cancellation to minimize the input bias current. The inputs are
cascoded to protect the super beta input devices from damage
during overvoltage conditions. The cascoded inputs feed into an
active load that makes up the primary gain stage. A buffered
transconductance (gm) stage converts a differential voltage to a
differential current to drive the output stage. The rail-to-rail
output can swing to 50 mV maximum (for example, the
guaranteed room temperature limit for VOH is 14.95 V when
the positive supply is 15 V) with a 1 mA load at 25°C.
gm
Figure 84. Conceptual Schematic



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