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ISL28433 数据表(PDF) 11 Page - Intersil Corporation

部件名 ISL28433
功能描述  Single, Dual, and Quad Micropower, Zero-Drift, RRIO Operational Amplifiers
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL28433 数据表(HTML) 11 Page - Intersil Corporation

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11
FN6560.1
May 29, 2009
voltage supplies are not practical using typical low offset
precision op amps. For example, the typical ±100µV VOS
and offset drift 0.5µV/°C of a low offset op amp would
produce a DC error of >1V with an additional 5mV°C of
temperature dependent error making it difficult to resolve DC
input voltage changes in the micro-volt range.
The ±8µV max VOS and 0.075µV/°C of the ISL28133
produces a temperature stable maximum DC output error of
only ±80mV with a maximum temperature drift of 0.75µV/°C.
The additional benefit of a very low 1/f noise corner
frequency and some feedback filtering enables DC voltages
and voltage fluctuations well below 100nV to be easily
detected with a simple single stage amplifier.
ISL28133 SPICE Model
Figure 38 shows the SPICE model schematic and Figure 39
shows the net list for the ISL28133 SPICE model. The model
is a simplified version of the actual device and simulates
important parameters such as noise, Slew Rate, Gain and
Phase. The model uses typical parameters from the
ISL28133. The poles and zeros in the model were
determined from the actual open and closed-loop gain and
phase response. This enables the model to present an
accurate AC representation of the actual device. The model
is configured for ambient temperature of +25°C.
Figures 40 through 47 show the characterization vs
simulation results for the Noise Density, Frequency
Response vs Close Loop Gain, Gain vs Frequency vs CL
and Large Signal Step Response (4V).
FIGURE 37. HIGH GAIN, PRECISION DC COUPLED AMPLIFIER
-
+
100
Ω
RL
VIN
VOUT
1M
Ω
1M
Ω,
100
Ω
ISL28133
-2.5V
+2.5V
ACL = 10kV/V
CF
0.018µF
ISL28133, ISL28233, ISL28433


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