ISL28108 INTERSIL [Intersil Corporation], ISL28108 Datasheet - Page 17

• Manufacturer Part Number: ISL28108
• Description: 40V Precision Single Supply Rail-Rail Output Low Power Operational Amplifiers
• Manufacturer: INTERSIL [Intersil Corporation]

Using Only One Channel
If the application only requires one channel, the user must
configure the unused channel to prevent it from oscillating. The
unused channel will oscillate if the input and output pins are
floating. This will result in higher than expected supply currents
and possible noise injection into the channel being used. The
proper way to prevent this oscillation, is to short the output to the
inverting input and ground the positive input (as shown in Figure
54).
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
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
where:
• P
• PD
where:
• T
• θ
• PD
• V
• I
• V
• R
JMAX
PD
FIGURE 54. PREVENTING OSCILLATIONS IN UNUSED CHANNELS
each amplifier in the package (PD
qMAX
MAX
JA
S
OUTMAX
DMAXTOTAL
L
MAX
MAX
MAX
= Total supply voltage
= Load resistance
= Thermal resistance of the package
=
= Maximum ambient temperature
= Maximum quiescent supply current of 1 amplifier
=
T
for each amplifier can be calculated using Equation 2:
= Maximum power dissipation of 1 amplifier
MAX
= Maximum output voltage swing of the application
V
S
×
is the sum of the maximum power dissipation of
+
JMAX
I
θ
qMAX
JA
) for all applications to determine if power
xPD
+
MAXTOTAL
(
V
S
+
-
- V
OUTMAX
17
MAX
)
ISL28108, ISL28208, ISL28408
×
)
V
------------------------
OUTMAX
R
L
(EQ. 2)
(EQ. 1)
ISL28108, ISL28208, ISL28408 SPICE Model
Figure 55 shows the SPICE model schematic and Figure 56 shows
the net list for the 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 voltage, Slew Rate, CMRR, Gain and Phase. The
DC parameters are I
swing. The model uses typical parameters given in the “Electrical
Specifications” Table beginning on page 4. The AVOL is adjusted
for 122dB with the dominant pole at 1Hz. The CMRR is set 128dB,
f = 6kHz. The input stage models the actual device to present an
accurate AC representation. The model is configured for ambient
temperature of +25°C.
Figures 57 through 71 show the characterization vs simulation
results for the Noise Voltage, Open Loop Gain Phase, Closed Loop
Gain vs Frequency, Gain vs Frequency vs RL, CMRR, Large Signal
10V Step Response, Small Signal 0.05V Step and Output Voltage
Swing ±15V supplies.
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.
OS
, total supply current and output voltage
July 1, 2011
FN6935.2