BD87521G-LB Rail-to-Rail Input and Output CMOS Amplifier
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Specifications
- Product Name: ROHM Solution Simulator
- Features: Excellent EMI Immunity, High Output Drive,
Rail-to-Rail Input/Output, CMOS Operational Amplifier
Product Usage Instructions
1. Simulation Schematic
Figure 1 shows the simulation schematic.
2. How to Simulate
The simulation settings can be configured from the ‘Simulation
Settings’ as shown in Figure 2. Table 1 displays the default setup
of the simulation.
3. Simulation Conditions
Table 2 lists the simulation condition parameters including
instance name, type, parameters, default values, variable range,
and units.
4. Op-Amp Model
Table 3 displays the model pin functions used for the
simulation, such as non-inverting input, inverting input, positive
power supply, negative power supply/ground, and output.
5. Peripheral Components
5.1 Bill of Material
Table 4 shows the list of components used in the simulation
schematic along with their default values and variable ranges.
5.2 Capacitor Equivalent Circuits
Figure 3 illustrates the capacitor property editor and
equivalent circuit. The default value of ESR is 2mΩ. Note that
parameters can take any positive value or zero in simulation but it
does not guarantee operation in all conditions.
Recommended Products
Op-Amp: BD87521G-LB – 1ch Excellent EMI
Immunity High Output Drive Rail-to-Rail I/O CMOS Op-Amp.
FAQ
- Q: Can I change the simulation type?
- A: It is recommended not to change the Simulation Type from DC
voltage level range of 0 V to 5 V by 0.1 V. - Q: How do I customize component parameters?
- A: You can customize parameters of components shown in blue,
such as VSOURCE, or peripheral components, to simulate the voltage
follower with desired operating conditions. - Q: Where can I find the published application note for
simulating the circuit? - A: You can find the published application note on Operational
amplifier and Comparator (Tutorial) in multiple languages.
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User’s Guide
ROHM Solution Simulator
Excellent EMI Immunity High Output Drive Rail-to-Rail Input/Output CMOS Operational Amplifier
BD87521G-LB Voltage Follower DC Sweep simulation
This circuit simulates DC sweep response with Op-Amp as a voltage follower. You can observe the output voltage when the input voltage is changed. You can customize the parameters of the components shown in blue, such as VSOURCE, or peripheral components, and simulate the voltage follower with the desired operating condition.
You can simulate the circuit in the published application note: Operational amplifier, Comparator (Tutorial). [JP] [EN] [CN] [KR]
General Cautions Caution 1: The values from the simulation results are not guaranteed. Please use these results as a guide for your design. Caution 2: These model characteristics are specifically at Ta=25°C. Thus, the simulation result with temperature variances may significantly differ from the result with the one done at actual application board (actual measurement). Caution 3: Please refer to the Application note of Op-Amps for details of the technical information. Caution 4: The characteristics may change depending on the actual board design and ROHM strongly recommend to double check those characteristics with actual board where the chips will be mounted on.
1 Simulation Schematic
Figure 1. Simulation Schematic
2 How to simulate
The simulation settings, such as parameter sweep or convergence options, are configurable from the `Simulation Settings’ shown in Figure 2, and Table 1 shows the default setup of the simulation.
In case of simulation convergence issue, you can change advanced options to solve. The temperature is set to 27 °C in the default statement in `Manual Options’. You can modify it.
Simulation Settings
Simulate
Table 1. Simulation settings default setup
Parameters
Default
Simulation Type
DC
Parameter Sweep
VSOURCE
Advanced options
Balanced Convergence Assist
Manual Options
.temp 27
Figure 2. Simulation Settings and execution
Note Do not change Simulation Type VOLTAGE_LEVEL from 0 V to 5 V by 0.1 V –
©2024 ROHM Co., Ltd.
No. 67UG006E Rev.001
Apr.2024 1/3
BD87521G-LB Voltage Follower DC Sweep simulation
User’s Guide
3 Simulation Conditions
Table 2. List of the simulation condition parameters
Instance Name
Type
Parameters
Voltage_level
VSOURCE Voltage Source AC_magnitude
AC_phase
VDD
Voltage Source For Op-Amp
Voltage_level AC_magnitude AC_phase
(Note 1) Set it to the guaranteed operating range of the Op-Amps.
Default Value
5 0.0 0.0 5 0.0 0.0
Variable Range
Min
Max
VSS
VDD
fixed
fixed
4(Note1)
15(Note1)
fixed
fixed
Units
V V ° V V °
4 Op-Amp model
Table 3 shows the model pin function implemented. Note that the Op-Amp model is the behavioral model for its input/output characteristics, and neither protection circuits nor functions unrelated to the purpose are implemented.
Table 3. Op-Amp model pins used for the simulation
Pin Name
Description
+IN
Non-inverting input
-IN
Inverting input
VDD
Positive power supply
VSS
Negative power supply / Ground
OUT
Output
©2024 ROHM Co., Ltd.
No. 67UG006E Rev.001
Apr.2024 2/3
BD87521G-LB Voltage Follower DC Sweep simulation
User’s Guide
5 Peripheral Components
5.1 Bill of Material Table 4 shows the list of components used in the simulation schematic. Each of the capacitors has the parameters
of equivalent circuit shown below. The default values of equivalent components are set to zero except for the ESR of C. You can modify the values of each component.
Table 4. List of capacitors used in the simulation circuit
Type
Instance Name
Default Value
Resistor
R1_1 RL1
0 10k
Capacitor
C1_1 CL1
0.1 10
Variable Range
Min
Max
0
10
1k
1M, NC
0.1
22
free, NC
Units
k pF pF
5.2 Capacitor Equivalent Circuits
(a) Property editor
(b) Equivalent circuit
Figure 3. Capacitor property editor and equivalent circuit
The default value of ESR is 2m . (Note 2) These parameters can take any positive value or zero in simulation but it does not guarantee the operation
of the IC in any condition. Refer to the datasheet to determine adequate value of parameters.
6 Recommended Products
6.1 Op-Amp
BD87521G-LB : 1ch Excellent EMI Immunity High Output Drive Rail-to-Rail I/O CMOS Op-Amp. [JP] [EN] [CN] [KR] [TW] [DE]
BD87522FJ-LB : 2ch Excellent EMI Immunity High Output Drive Rail-to-Rail I/O CMOS Op-Amp. [JP] [EN] [CN] [KR] [TW] [DE]
BD87524FV-LB : 4ch Excellent EMI Immunity High Output Drive Rail-to-Rail I/O CMOS Op-Amp. [JP] [EN] [CN] [KR] [TW] [DE]
Technical Articles and Tools can be found in the Design Resources on the product web page.
©2024 ROHM Co., Ltd.
No. 67UG006E Rev.001
Apr.2024 3/3
Datasheet
General Precaution
1. Before you use our Products, you are requested to carefully read this document and fully understand its contents. ROHM shall not be in any way responsible or liable for failure, malfunction or accident arising from the use of any ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this document is current as of the issuing date and subject to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the latest information with a ROHM sales representative.
3. The information contained in this document is provided on an “as is” basis and ROHM does not warrant that all information contained in this document is accurate and/or error-free. ROHM shall not be in any way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccuracy or errors of or concerning such information.
Notice WE
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.001
Documents / Resources
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