PSoC® Creator™ Component Data Sheet
Operational Amplifier (Opamp)
1.50
Features
•
Follower or Opamp configuration
•
Unity gain bandwidth > 3.0 MHz
•
Input offset voltage 2.0 mV max
•
Rail-to-rail inputs and output
•
Output direct low resistance connection to pin
•
25 mA output current
•
Programmable power and bandwidth
•
Internal connection for follower (saves pin)
General Description
The Opamp component provides a low voltage, low power operational amplifier and may be
internally connected as a voltage follower. The inputs and output may be connected to internal
routing nodes, directly to pins, or a combination of internal and external signals. The Opamp is
suitable for interfacing with high impedance sensors, buffering the output of voltage DACs,
driving up to 25 mA; and constructing active filters in any standard topology.
Input/Output Connections
This section describes the various input and output connections for the Opamp. An asterisk (*) in
the list of I/Os indicates that the I/O may be hidden on the symbol under the conditions listed in
the description of that I/O.
Non-Inverting – Analog
When the Opamp is configured as a follower, this I/O is the voltage input. If the Opamp is
configured as an Opamp, this I/O acts as the standard Opamp non-inverting input.
Inverting – Analog *
When the Opamp component is configured for Opamp mode, this I/O is the normal inverting
input. When the Opamp is configured for Follower mode, this I/O is hard-connected to the output
and the I/O is unavailable.
PRELIMINARY
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-60897 Rev. **
Revised July 26, 2010
Operational Amplifier (Opamp)
PSoC® Creator™ Component Data Sheet
Vout – Analog
The output is directly connected to a pin. It is capable of driving 25 mA and can be connected to
internal loads using the analog routing fabric. When used for internal routing, the output remains
connected to the pin.
Schematic Macro Information
The default Opamp in the Component Catalog is a schematic macro using an Opamp
component with default settings. The Opamp component is connected to an analog Pins
component named Vout_1.
Parameters and Setup
Drag an Opamp component onto your design and double-click it to open the Configure dialog.
Figure 1 Configure Opamp Dialog
The Opamp has the following parameters:
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PSoC® Creator™ Component Data Sheet
Operational Amplifier (Opamp)
Mode
This parameter allows you to select between two configurations: "Opamp" and "Follower". In
Opamp mode, all three terminals are available for connection. In Follower mode, the inverting
input is internally connected to the output to create a voltage follower. Opamp is the default
configuration.
Figure 2 Configuration Options
Power
The Opamp works over a wide range of operating currents. Higher operating current increases
Opamp bandwidth. The Power parameter allows you to select the power level:
•
In High and Medium power modes, the output is a class AB stage, enabling direct drive of
substantial output currents.
•
In Low power mode, the output is a class A stage with limited current drive.
•
In "Low Power Over Compensated" (LPOC) mode, the output is a class A stage. For
PSoC 3 ES3 silicon.
The LPOC mode is used for low-power transimpedance amplifiers (TIAs). This mode has
the same drive capability as low power, but includes additional compensation for circuit
topologies with higher than normal input capacitance as is often seen in photo sensors
and other current-output sensors of various types.
Wider bandwidth TIAs can be implemented using the medium or high power settings. In
this case, exercise the usual care in dealing with compensation for capacitively loaded
sources.
Note The above description of LPOC mode is true for PSoC 3 ES3 silicon only. For PSoC 3 ES2
silicon, LPOC mode is not supported; High Power mode should be used instead. For PSoC 3
ES2 silicon, the High Power setting enables the 1.024 V Vref on the positive input. Any design
with an Opamp that requires this Vref must include at least one Opamp that has this High Power
mode setting.
Placement
Each Opamp is directly connected to specific GPIOs.
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Operational Amplifier (Opamp)
PSoC® Creator™ Component Data Sheet
Non-inverting input
Inverting input
Output
opamp_0
P0[2]
P0[3]
P0[1]
opamp_1
P3[5]
P3[4]
P3[6]
opamp_2
P0[4]
P0[5]
P0[0]
opamp_3
P3[3]
P3[2]
P3[7]
Refer to the device data sheet for the part being used for the specific physical pin connections.
Input signals may use the analog global routing buses in addition to the dedicated input pins.
Using the direct connections utilizes fewer internal routing resources and results in lower route
resistance and capacitance. The output pin associated with each specific location will always be
driven by the Opamp, when enabled.
Ports P0[3] and P3[2] are also used for connection to a capacitor for bypassing the bandgap
reference supplied to the ADC, for a reference output, or for an input from an external reference.
When these reference connections are used, routing to the Opamp inverting inputs must be
done through the analog global routing buses.
The following shows one example of how the Opamp may be connected using the Design-Wide
Resources Pin Editor.
Figure 3 Example placement
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PSoC® Creator™ Component Data Sheet
Operational Amplifier (Opamp)
Resources
The Opamp component uses one Opamp resource per instance. When used in the Opamp
mode with external components (that is, not routing the output through the analog globals), no
routing resources are used.
Application Programming Interface
Application Programming Interface (API) routines allow you to configure the component using
software. The following table lists and describes the interface to each function. The subsequent
sections cover each function in more detail.
By default, PSoC Creator assigns the instance name "Opamp_1" to the first instance of a
component in a given design. You can rename it to any unique value that follows the syntactic
rules for identifiers. The instance name becomes the prefix of every global function name,
variable, and constant symbol. For readability, the instance name used in the following table is
"Opamp".
Function
Description
void Opamp_Init(void)
Initializes or restores default Opamp configuration.
void Opamp_Enable(void)
Enables the Opamp.
void Opamp_Start(void)
Turns on the Opamp and sets the power level to the value chosen
during the parameter selection.
void Opamp_Stop(void)
Disable Opamp (power down)
void Opamp_SetPower(uint8 power)
Set the power level.
void Opamp_Sleep(void)
Stops and saves the user configuration.
void Opamp_Wakeup(void)
Restores and enables the user configuration.
void Opamp_SaveConfig(void)
Empty function. Provided for future usage.
void Opamp_RestoreConfig(void)
Empty function. Provided for future usage.
Global Variables
Variable
Opamp_initVar
Description
Indicates whether the Opamp has been initialized. The variable is initialized to 0 and set to 1 the
first time Opamp_Start() is called. This allows the component to restart without reinitialization
after the first call to the Opamp_Start() routine.
If reinitialization of the component is required, then the Opamp_Init() function can be called
before the Opamp_Start() or Opamp_Enable() function.
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Operational Amplifier (Opamp)
PSoC® Creator™ Component Data Sheet
void Opamp_Init(void)
Description:
Initializes or restores default Opamp configuration.
Parameters:
None
Return Value:
None
Side Effects:
All registers will be reset to their initial values. This will reinitialize the component.
void Opamp_Enable(void)
Description:
Enables the Opamp.
Parameters:
None
Return Value:
None
Side Effects:
None
void Opamp_Start(void)
Description:
Turns on the Opamp and sets the power level to the value chosen during the parameter
selection.
Parameters:
None
Return Value:
None
Side Effects:
None
void Opamp_Stop(void)
Description:
Turn off the Opamp and enable its lowest power state.
Parameters:
None
Return Value:
None
Side Effects:
None
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PSoC® Creator™ Component Data Sheet
Operational Amplifier (Opamp)
void Opamp_SetPower(uint8 power)
Description:
Sets the power level.
Parameters:
(uint8) power: Sets the power level to one of four settings, LPOC, Low, Medium, or High.
Power Setting
Notes
Opamp_LPOCPOWER
Least power, compensated for TIA.
Opamp_LOWPOWER
Least power, reduced bandwidth
Opamp_MEDPOWER
Opamp_HIGHPOWER
Return Value:
None
Side Effects:
None
Highest bandwidth
void Opamp_Sleep(void)
Description:
Stops the component operation. Saves the configuration registers and the component enable
state. Should be called just prior to entering sleep.
Parameters:
None
Return Value:
None
Side Effects:
None
void Opamp_Wakeup(void)
Description:
Restores the component enable state and configuration registers. Should be called just after
awaking from sleep.
Parameters:
None
Return Value:
None
Side Effects:
None
void Opamp_SaveConfig(void)
Description:
Empty function. Provided for future usage.
Parameters:
None
Return Value:
None
Side Effects:
None
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Operational Amplifier (Opamp)
PSoC® Creator™ Component Data Sheet
void Opamp_RestoreConfig(void)
Description:
Empty function. Provided for future usage.
Parameters:
None
Return Value:
None
Side Effects:
None
Sample Firmware Source Code
The following is a C language example demonstrating the basic functionality of the Opamp
component. This example assumes the component has been placed in a design with the default
name "Opamp_1."
Note If you rename your component you must also edit the example code as appropriate to
match the component name you specify.
#include <device.h>
void main()
{
Opamp_1_Start();
}
DC and AC Electrical Characteristics
The following values are based on characterization data. Specifications are valid for -40° C ≤ TA
≤ 85° C and TJ ≤ 100° C except where noted. Unless otherwise specified in the tables below, all
Typical values are for TA = 25° C, Vdda = 5.0 V, Power = High, output referenced to analog
ground, Vssa.
5.0 V/3.3 V DC Electrical Characteristics
Parameter
Vos
TCVos
Description
Input Offset Voltage
Temp. coeff. input
offset voltage,
absolute value
Conditions
Min
Typ
Max
Units
Vdda=3.3 V, 25 C, P=LPOC
na
0.5
2
mV
Vdda=3.3 V, 25 C, P=Low
na
0.5
2
mV
Vdda=3.3 V, 25 C, P=Med
na
0.5
2
mV
Vdda=3.3 V, 25 C, P=High
na
0.5
2
mV
P=LPOC
na
tbc
tbc
uV/°C
P=Low
na
tbc
tbc
uV/°C
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PSoC® Creator™ Component Data Sheet
Parameter
AVOL
Description
Open Loop Gain
Operational Amplifier (Opamp)
Conditions
Min
Typ
Max
Units
P=Med
na
tbc
tbc
uV/°C
P=High
na
tbc
tbc
uV/°C
P=LPOC, Cload=15pF
tbc
tbc
na
dB
P=Low, Cload=15pF
tbc
tbc
na
dB
P=Med, Cload=15pF
tbc
tbc
na
dB
P=High, Cload=15pF
tbc
tbc
na
dB
tbc
tbc
Megohms
na
tbc
tbc
pF
Vssa
-
Vdda
mV
Vssa + 50
-
Vdda - 50
mV
na
tbd
na
ohms
Rin
Input resistance
Positive gain, non-inverting input
Cin
Input capacitance
Not including routing capacitance
Vi
Input voltage range
Vo
Output voltage range
Rout
Open loop output
impedance
Iout
Output current
Output voltage between Vssa
+500 mV and Vdda -500 mV, and
Vdda > 2.7 V
25
na
na
mA
Iout
Output current
Output voltage between Vssa
+500 mV and Vdda -500 mV, and
Vdda > 1.7 V and Vdda < 2.7 V
16
na
na
mA
IoutSCsrc
Short circuit current,
source
IoutSCsink
Short circuit current,
sink
Vout_range
Output swing
Gain = 1, Rload = 100k to Vdda/2
tbc
tbc
tbc
Ge1
Gain accuracy, in
unity gain buffer
mode
G=1, Vdda=5.0 V, P=High,
Rload = 1 kohm
tbc
tbc
tbc
%
CMRR
Common mode
rejection ratio
Vincm=0.5 V to Vdda-0.5 V
70
-
-
dB
PSRR
Power supply
rejection ratio
Gain=1, measured as shift in
offset voltage at DC
tbc
tbc
Idda
Operating current
Vdda=1.71 V, P=Low
na
tbc
tbc
uA
Vdda=5.0 V, P=High
na
tbc
tbc
uA
Output load = 1 mA
dB
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Operational Amplifier (Opamp)
PSoC® Creator™ Component Data Sheet
Figures
Histogram offset voltage 100 parts, 4 per part
Power=High
X axis mV
Y axis % in bins
Voffset vs temperature, Vdda=5.0V
Power=High
X axis: temp -40 to 85 C
Y axis Voffset 1 max
2 typ
3 min
Voffset vs VCM at Temperature, Power=High
X axis: temp -40 to 85 C
Y axis V common morde
1 -40C
2 25C
3 85C
Operating current vs voltage, P=LPOC
X axis Vdda, 1.7, 2.7, 3.3, 5.0
Y axis Op current uA
1 max at worst temp
2 typ at 25C
Operating current vs voltage, P=Low
X axis Vdda, 1.7, 2.7, 3.3, 5.0
Y axis Op current uA
1 max at worst temp
2 typ at 25C
Operating current vs voltage, P=Med
X axis Vdda, 1.7, 2.7, 3.3, 5.0
Y axis Op current uA
1 max at worst temp
2 typ at 25C
Operating current vs voltage, P=High
X axis Vdda, 1.7, 2.7, 3.3, 5.0
Y axis Op current uA
1 max at worst temp
2 typ at 25C
Operating current vs temp, P=LPOC
X axis Temp, -40 to +85C
Y axis op current uA
1 Typ at 2.7V
2 Max at 2.7V
3 Typ at 5.5V
4 Max at 5.5V
Operating current vs temp, P=Low
X axis Temp, -40 to +85C
Y axis op current uA
1 Typ at 2.7V
2 Max at 2.7V
3 Typ at 5.5V
4 Max at 5.5V
Operating current vs temp, P=Med
X axis Temp, -40 to +85C
Y axis op current uA
1 Typ at 2.7V
2 Max at 2.7V
3 Typ at 5.5V
4 Max at 5.5V
Operating current vs temp, P=High
X axis Temp, -40 to +85C
Y axis op current uA
1 Typ at 2.7V
2 Max at 2.7V
3 Typ at 5.5V
4 Max at 5.5V
Output voltage vs load current,
Vdda=2.7V, P=LPOC
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
Output voltage vs load current,
Vdda=2.7V, P=Low
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
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PSoC® Creator™ Component Data Sheet
Operational Amplifier (Opamp)
Output voltage vs load current,
Vdda=2.7V, P=Med
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
Output voltage vs load current,
Vdda=2.7V, P=High
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
Output voltage vs load current,
Vdda=5.0V, P=LPOC
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
Output voltage vs load current,
Vdda=5.0V, P=Low
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
Output voltage vs load current,
Vdda=5.0V, P=Med
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
Output voltage vs load current,
Vdda=5.0V, P=High
X axis output current uA
Y axis output voltage
1 Vdda-Voh at -40
2 Vdda-Voh at 25
3 Vdda-Voh at 85
4 Vol at -40
5 Vol at 25
6 Vol at 85
5.0 V/3.3 V AC Electrical Characteristics
Parameter
Description
Conditions
Min
Typ
Max
Units
GBW_L
Gain Bandwidth
Product, P=Low
Gain=1, Vdda=2.7 V, 25 C
tbc
tbc
na
MHz
GBW_M
Gain Bandwidth
Product, P=Med
Gain=1, Vdda=5.0 V, 25 C
tbc
tbc
na
MHz
GBW_H
Gain Bandwidth
Product, P=High
Gain=1, Vdda=5.0 V, 25 C
tbc
tbc
na
MHz
SR_PLPOC
Slew rate, 2 V step
P=LPOC, Cload=15pF, Rload=100k
tbc
tbc
na
V/us
SR_PLow
P=Low, Cload=15pF, Rload=100k
tbc
tbc
na
V/us
SR_PMed
P=Med, Cload=15pF, Rload=100k
tbc
tbc
na
V/us
SR_PHigh
P=High, Cload=15pF, Rload=100k
tbc
tbc
na
V/us
SR_PHigh200
P=High, Cload=200pF, Rload=2k
tbc
tbc
na
V/us
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Operational Amplifier (Opamp)
PSoC® Creator™ Component Data Sheet
Tsettle_PLPOC Settling time to
0.1%
1.0V step, CLoad= 15pF
Vdda= 5.0 V, G=1, P=LPOC
na
tbc
tbc
nsec
Tsettle_PLow
1.0V step, CLoad= 15pF
Vdda= 5.0 V, G=1, P=Low
na
tbc
tbc
nsec
Tsettle_PMed
1.0V step, CLoad= 15pF
Vdda= 5.0 V, G=1, P=Med
na
tbc
tbc
nsec
Tsettle_PHigh
1.0V step, CLoad= 200pF
Vdda= 5.0 V, G=1, P=High
na
tbc
tbc
nsec
f=10 kHz, P=TIA
na
tbc
na
nV/rtHz
Vn_Plow
f=10 kHz, P=Low
na
tbc
na
nV/rtHz
Vn_Pmed
f=10 kHz, P=Med
na
tbc
na
nV/rtHz
Vn_Phigh
f=10 kHz, P=High
na
tbc
na
nV/rtHz
At unity gain, CLoad= 15pF, P=Low
tbc
tbc
na
deg
At unity gain, CLoad= 200pF, P=High
tbc
tbc
na
deg
Vn_PLPOC
ΦM
ΦM
Input referred
voltage noise
Phase Margin
Figures
Open Loop Frequency Response, 3.3V, CL=15pF,
P=LPOC
X axis 10 kHz to 10 MHz
Y1(left) axis Gain, dB
Y2(right)axis Phase, degrees
1 Gain, T=-40
2 Gain, T=25
3 Gain, T=85
4 Phase, T=-40
5 Phase, T=25
6 Phase, T=85
Open Loop Frequency Response, 3.3V, CL=15pF,
P=Low
X axis 10 kHz to 10 MHz
Y1(left) axis Gain, dB
Y2(right)axis Phase, degrees
1 Gain, T=-40
2 Gain, T=25
3 Gain, T=85
4 Phase, T=-40
5 Phase, T=25
6 Phase, T=85
Open Loop Frequency Response, 3.3V, CL=15pF,
P=Med
X axis 10 kHz to 10 MHz
Y1(left) axis Gain, dB
Y2(right)axis Phase, degrees
1 Gain, T=-40
2 Gain, T=25
3 Gain, T=85
4 Phase, T=-40
5 Phase, T=25
6 Phase, T=85
Open Loop Frequency Response, 3.3V, CL=15pF,
P=High
X axis 10 kHz to 10 MHz
Y1(left) axis Gain, dB
Y2(right)axis Phase, degrees
1 Gain, T=-40
2 Gain, T=25
3 Gain, T=85
4 Phase, T=-40
5 Phase, T=25
6 Phase, T=85
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PSoC® Creator™ Component Data Sheet
Operational Amplifier (Opamp)
Closed Loop Gain vs freq, Gain=1, 3.3V, T=25C
X axis 10 kHz to 10 MHz
Y axis Gain, dB
1 P=Low, CL=15pF
2 P=Med, CL=15pF
3 P=High, CL=200pF
4 P=High CL=15pF
Closed Loop Gain vs freq, Gain=10, 3.3V, T-25C
X axis 10 kHz to 10 MHz
Y axis Gain, dB
1 P=Low, CL=15pF
2 P=Med, CL=15pF
3 P=High, CL=200pF
4 P=High CL=15pF
Large Signal Step Response, 2V step,
G=1, CL=15pF, RL=100k, Vdda=5V, P=low
X axis 1 usec/div10 kHz to 10 MHz
Y axis 500 mV/div
Large Signal Step Response, 2V step,
G=1, CL=15pF, RL=100k, Vdda=5V, P=med
X axis 1 usec/div10 kHz to 10 MHz
Y axis 500 mV/div
Large Signal Step Response, 2V step,
G=1, CL=15pF, RL=100k, Vdda=5V, P=high
X axis 1 usec/div10 kHz to 10 MHz
Y axis 500 mV/div
CMRR vs freq, Vdda = 5.0V, P=high
X axis freq 100 Hz to 1.0 MHz
Y axis dB
PSRR vs freq, Vdda = 5.0V, P=high
X axis freq 100 Hz to 1.0 MHz
Y axis dB
Voltage noise, Vdda = 5.0V, P=high
Xaxis freq kHz .01 to 1000 kHz
Yaxis voltage noise nV/rtHz
Note More specifications at other voltages and graphs may be added after characterization.
Component Changes
This section lists the major changes in the component from the previous version.
Version
1.50
Description of Changes
Added Sleep/Wakeup and
Init/Enable APIs.
Reason for Changes / Impact
To support low power modes, as well as to provide common
interfaces to separate control of initialization and enabling of
most components.
© Cypress Semiconductor Corporation, 2009-2010. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the
use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to
be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
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conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as
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Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein.
Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in lifesupport systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application
implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Use may be limited by and subject to the applicable Cypress software license agreement.
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