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ISL28230CBZ Datasheet(PDF) 10 Page - Intersil Corporation

No. de pieza ISL28230CBZ
Descripción Electrónicos  Single, Dual, and Quad Micropower, Low Drift, RRIO Operational Amplifiers
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL28230CBZ Datasheet(HTML) 10 Page - Intersil Corporation

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ISL28130, ISL28230, ISL28430
10
FN7623.0
August 17, 2010
Applications Information
Functional Description
The ISL28130, ISL28230 and ISL28430 are low offset
low drift operational amplifiers with a very high open loop
gain (150dB). The ISL28130, ISL28230 and ISL28430
operate on a single supply range of 1.65V to 5.5V or dual
supply range of ±0.825V to ±2.75V while consuming
only 20µA of supply current per channel. The ISL28130,
ISL28230 and ISL28430 has a 400kHz gain-bandwidth.
The high open loop gain, low offset voltage, high
bandwidth and low 1/f noise make the ISL28130,
ISL28230 and ISL28430 ideal for precision applications.
Rail-to-rail Input and Output (RRIO)
The RRIO CMOS amplifier uses parallel input PMOS and
NMOS that enable the inputs to swing 100mV beyond
either supply rail. The inverting and non-inverting inputs
do not have back-to-back input clamp diodes and are
capable of maintaining high input impedance at high
differential input voltages. This is effective in eliminating
output distortion caused by high slew-rate input signals.
The output stage uses common source connected PMOS
and NMOS devices to achieve rail-to-rail output drive
capability with 15mA current limit and the capability to
swing to within 50mV of either rail while driving a 10kΩ
load.
IN+ and IN- Protection
All input terminals have internal ESD protection diodes
to both positive and negative supply rails, limiting the
input voltage to within one diode beyond the supply
rails. For applications where either input is expected to
exceed the rails by 0.5V, an external series resistor
must be used to ensure the input currents never exceed
20mA (see Figure 21).
Layout Guidelines for High Impedance
Inputs
To achieve the maximum performance of the high input
impedance and low offset voltage of the ISL28130,
ISL28230 and ISL28430 amplifiers, care should be
taken in the circuit board layout. The PC board surface
must remain clean and free of moisture to avoid
leakage currents between adjacent traces. Surface
coating of the circuit board will reduce surface moisture
and provide a humidity barrier, reducing parasitic
resistance on the board.
High Gain, Precision DC-Coupled Amplifier
The circuit in Figure 22 implements a single-stage
DC-coupled amplifier with an input DC sensitivity of
under 100nV that is only possible using a low VOS
amplifier with high open loop gain. High gain DC
amplifiers operating from low voltage supplies are not
practical using typical low offset precision op amps. For
example, a typical precision amplifier in a gain of 10kV/V
with a ±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 mV range.
The ±40µV max VOS and 150nV/°C of temperature drift
of the ISL28130, ISL28230, ISL28430 produces a
temperature stable maximum DC output error of only
±400mV with a maximum output temperature drift of
1.5mV/°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 10µV to be
easily detected with a simple single stage amplifier.
FIGURE 21. INPUT CURRENT LIMITING
-
+
RIN
RL
VIN
VOUT
FIGURE 22. HIGH GAIN, PRECISION DC-COUPLED
AMPLIFIER
-
+
100
Ω
RL
VIN
VOUT
1M
Ω
1M
Ω,
100
Ω
-2.5V
+2.5V
ACL = 10kV/V
CF
0.018µF


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