ISL76627 Datasheet, PDF (11/18 Pages) Intersil Corporation – Precision Low Noise Operational Amplifier

ISL76627
Output Phase Reversal
Output phase reversal is a change of polarity in the amplifier
transfer function when the input voltage exceeds the supply
voltage. The ISL76627 is immune to output phase reversal, even
when the input voltage is 1V beyond the supplies.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power supply conditions. It
is therefore important to calculate the maximum junction
temperature (T_JMAX) for all applications to determine if power
supply voltages, load conditions, or package type need to be
modified to remain in the safe operating area. These parameters
are related using Equation 1:
T_JMAX = T_MAX + θ_JAxPD_MAX
(EQ. 1)
where:
• P_DMAX is the maximum power dissipation of the amplifier in
the package, and can be calculated using Equation 2:
PD_MAX
=
V_S × I_qMAX + (V_S
-
V_OU
T
M
AX
)
×
-^V---^O----^U---^T---^M-----^A---^X--
R_L
(EQ. 2)
where:
• T_MAX = Maximum ambient temperature
• θ_JA = Thermal resistance of the package
• V_S = Total supply voltage
• I_qMAX = Maximum quiescent supply current of the amplifier
• V_OUTMAX = Maximum output voltage swing of the application
• R_L = Load resistance
ISL76627 SPICE Model
Figure 30 shows the SPICE model schematic and Figure 31 shows
the net list for the ISL76627 SPICE model. The model is a
simplified version of the actual device and simulates important AC
and DC parameters. AC parameters incorporated into the model
are: 1/f and flatband noise, Slew Rate, CMRR, Gain and Phase.
The DC parameters are V_OS, I_OS, total supply current and output
voltage swing. The model does not model input bias current. The
model uses typical parameters given in the “Electrical
Specifications” table beginning on page 3. The AVOL is adjusted
for 128dB with the dominate pole at 5Hz. The CMRR is set higher
than the “Electrical Specifications” table to better match design
simulations (150dB,f = 50Hz). The input stage models the actual
device to present an accurate AC representation. The model is
configured for ambient temperature of +25°C.
Figures 32 through 47 show the characterization vs simulation
results for the Noise Voltage, Closed Loop Gain vs Frequency,
Closed Loop Gain vs Rf/Rg, Closed Loop Gain vs R_L, Closed Loop
Gain vs C_L, Large Signal 10V Step Response, Open Loop Gain
Phase and Simulated CMRR vs Frequency.
LICENSE STATEMENT
The information in this SPICE model is protected under the
United States copyright laws. Intersil Corporation hereby grants
users of this macro-model hereto referred to as “Licensee”, a
nonexclusive, nontransferable licence to use this model as long
as the Licensee abides by the terms of this agreement. Before
using this macro-model, the Licensee should read this license. If
the Licensee does not accept these terms, permission to use the
model is not granted.
The Licensee may not sell, loan, rent, or license the
macro-model, in whole, in part, or in modified form, to anyone
outside the Licensee’s company. The Licensee may modify the
macro-model to suit his/her specific applications, and the
Licensee may make copies of this macro-model for use within
their company only.
This macro-model is provided “AS IS, WHERE IS, AND WITH NO
WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED,
INCLUDING BUY NOT LIMITED TO ANY IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.”
In no event will Intersil be liable for special, collateral, incidental,
or consequential damages in connection with or arising out of
the use of this macro-model. Intersil reserves the right to make
changes to the product and the macro-model without prior
notice.
11
FN7725.0
July 12, 2011