Application Note 1867
Author: Kiran Bernard
ISL70444SEH SPICE Macro-Model
Introduction
License Statement
The ISL70444SEH features four low-power amplifiers
optimized to provide maximum dynamic range. These op
amps feature a unique combination of rail-to-rail operation on
the input and output as well as a slew enhanced front-end that
provides ultra fast slew rates. They also offer low power, low
offset voltage, and low temperature drift, making it ideal for
applications requiring both high DC accuracy and AC
performance. Manufactured in Intersil’s PR40 SOI Process, the
ISL70444SEH is immune to latch-up.
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 license 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.
The SPICE model for the ISL70444SEH Rad Hard Quad Op
Amp, was developed to help system designers evaluate the
operation of this IC, prior or in conjunction with proto-typing a
system design. This model accurately simulates typical
performance characteristics at room temperature (+25°C),
such as frequency analysis, noise analysis, and slew rate
analysis. Behaviors not supported are the bias current
cancellation circuit and some temperature analysis.
Functionality has been tested on ORCAD 10.0 and CADENCE
ORCAD 16.5. Other SPICE simulators may be used, however,
the model may require translation.
This macro-model is provided “AS IS, WHERE IS, AND WITH NO
WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED,
INCLUDING, BUT 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.
Reference Documents
• ISL70444SEH Data Sheet; FN8411
• ISL70444SEH SMD 5962-13214
Project Files
The zip file: ISL70444SEH.zip contains the project file
modelcreator.opj to be used in ORCAD simulator. The project
file has the model definition file (.lib), symbol file (.olb) and the
schematic page as shown in Figure 1. The simulation profile is
set up for AC analysis and sweeps parameter RF for various
gain configurations. Figures 2 through 9 show a comparison of
the simulation results versus bench results for various tests
and it can be seen that the model approximates the IC very
well.
VDD
+
-
INP U1
+
V+
VDD
{VDD}
VSS
{VDD}
+
-
0
-
R2
100
INM
-
OUT
RL
{RL}
ISL70444SEH
R1
0
OUT
V-
0.5VAC
0VDC + V1
AC LOOP
AC ANALYSIS
DB(V(OUT)/V(IN))
P(V(OUT)/V(IN))
0
{RF}
VEE
C1
{CL}
0
PARAMETERS:
VDD = 18.0
RL = 10k
CL = 10p
RF = 100k
FIGURE 1. BASIC NON-INVERTING GAIN CONFIGURATION IN ORCAD SPICE FOR AC ANALYSIS
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Application Note 1867
Simulation Performance Curves
70
70
60
60
50
40
40
20
10
G = 10
0
-10
20
0
-20
-20
-30
-30
-40
-40
10k
100k
1M
G = 10
10
G=1
-10
G=1
1k
G = 100
30
G = 100
GAIN (dB)
GAIN (dB)
30
-50
100
G = 1000
50
G = 1000
10M
-50
100
100M
1k
10k
FREQUENCY (Hz)
100k
1M
10
10
68pF
68pF
0
0
27pF
47pF
-10
47pF
-20
GAIN (dB)
GAIN (dB)
-10
12pF
27pF
-20
12pF
-30
-30
-40
-40
-50
100
-50
1k
10k
100k
1M
10M
100M
1
10
100
FIGURE 4. FREQUENCY RESPONSE vs CL
0.03
0.03
0.02
0.02
VOLTAGE (V)
0.04
0.01
0.00
-0.01
-0.03
1.0
1.2
1.4
1.6
TIME (µs)
FIGURE 6. SMALL SIGNAL RESPONSE
2
10M
100M
-0.01
-0.03
0.8
1M
0.00
-0.02
0.6
100k
0.01
-0.02
0.4
10k
FIGURE 5. SIMULATED FREQUENCY RESPONSE vs CL
0.04
0.2
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
VOLTAGE (V)
100M
FIGURE 3. SIMULATED FREQUENCY RESPONSE vs GAIN, VS = ±18V
FIGURE 2. FREQUENCY RESPONSE vs GAIN, VS = ±18V
-0.04
0.0
10M
FREQUENCY (Hz)
1.8
2.0
-0.04
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
TIME (µs)
FIGURE 7. SIMULATED SMALL SIGNAL RESPONSE
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Application Note 1867
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4
3
3
2
2
VOLTAGE (V)
VOLTAGE (V)
Simulation Performance Curves (Continued)
1
0
-1
1
0
-1
-2
-2
-3
-3
-4
0.2
0.4
0.6
0.8
1.0
1.2
TIME (µs)
1.4
1.6
FIGURE 8. LARGE SIGNAL RESPONSE
1.8
2.0
-4
0.0
0.2
0.4
0.6
0.8
1.0
1.2
TIME (µs)
1.4
1.6
1.8
FIGURE 9. SIMULATED LARGE SIGNAL RESPONSE
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is
cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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