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ISL28227FRTBZ Folha de dados(PDF) 11 Page - Intersil Corporation

Nome de Peças ISL28227FRTBZ
Descrição Electrónicos  Precision Single and Dual Low Noise Operational Amplifiers
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL28227FRTBZ Folha de dados(HTML) 11 Page - Intersil Corporation

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ISL28127, ISL28227
11
FN6633.3
March 18, 2010
Applications Information
Functional Description
The ISL28127 and ISL28227 are single and dual, low
noise 10MHz BW precision op amps. Both devices are
fabricated in a new precision 40V complementary bipolar
DI process. A super-beta NPN input stage with input bias
current cancellation provides low input bias current (1nA
typical), low input offset voltage (10µV typ), low input
noise voltage (3nV/√Hz), and low 1/f noise corner
frequency (5Hz). These amplifiers also feature high open
loop gain (1500V/mV) for excellent CMRR (120dB) and
THD+N performance (0.0002% @ 3.5VRMS, 1kHz into
2kΩ). A complimentary bipolar output stage enables high
capacitive load drive without external compensation.
Operating Voltage Range
The devices are designed to operate over the 4.5V
(±2.25V) to 40V (±20V) range and are fully
characterized at 10V (±5V) and 30V (±15V). Parameter
variation with operating voltage is shown in the “Typical
Performance Curves” beginning on page 7.
Input ESD Diode Protection
The input terminals (IN+ and IN-) have internal ESD
protection diodes to the positive and negative supply
rails, and an additional anti-parallel diode pair across
the inputs (see Figures 26 and 27).
For unity gain applications (see Figure 26) where the
output is connected directly to the non-inverting input a
current limiting resistor (RIN) will be needed under the
following conditions to protect the anti-parallel
differential input protection diodes.
• The amplifier input is supplied from a low impedance
source.
• The input voltage rate-of-rise (dV/dt) exceeds the
maximum slew rate of the amplifier (±3.6V/µs).
If the output lags far enough behind the input, the
anti-parallel input diodes can conduct. For example, if
an input pulse ramps from 0V to +10V in 1µs, then the
output of the ISL28x27 will reach only +3.6V (slew
rate = 3.6V/µs) while the input is at 10V, The input
differential voltage of 6.4V will force input ESD diodes to
conduct, dumping the input current directly into the
output stage and the load. The resulting current flow
can cause permanent damage to the ESD diodes. The
ESD diodes are rated to 20mA, and in the previous
example, setting RIN to 1k resistor (see Figure 26)
would limit the current to < 6.4mA, and provide
additional protection up to ±20V at the input.
In applications where one or both amplifier input
terminals are at risk of exposure to high voltage, current
limiting resistors may be needed at each input terminal
(see Figure 27 RIN+, RIN-) to limit current through the
power supply ESD diodes to 20mA.
FIGURE 25. % OVERSHOOT vs LOAD CAPACITANCE, VS = ±15V
Typical Performance Curves V
S = ±15V, VCM = 0V, RL = Open, unless otherwise
specified. (Continued)
CAPACITANCE (pF)
0
10
20
30
40
50
60
70
80
90
10
100
1000
10000
OV
ERS
HO
OT
+
VS = ±15V
RL = 10k
AV = 1
VOUT = 100mVP-P
OV
ERS
HO
OT
-
FIGURE 26. INPUT ESD DIODE CURRENT LIMITING-
UNITY GAIN
-
+
RIN
RL
VIN
VOUT
V+
V-
FIGURE 27. INPUT ESD DIODE CURRENT LIMITING -
DIFFERENTIAL INPUT
-
+
RIN-
RL
VIN-
VOUT
V+
V-
RIN
VIN+


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