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Texas Instruments AN-1873 DC Parameters (Rev. A) Application notes
Application Report
SNOA532A – June 2008 – Revised May 2013
AN-1873 DC Parameters
.....................................................................................................................................................
ABSTRACT
This application report discusses the DC parameters.
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Contents
Introduction ..................................................................................................................
VOS (Input Offset Voltage) ..................................................................................................
TCVOS (Input Offset Voltage Drift) .........................................................................................
IIN (Input Current) ............................................................................................................
IOS (Input Offset Current) ...................................................................................................
TCIOS (Input Offset Current Drift) ..........................................................................................
IB (Bias Current) .............................................................................................................
CMRR (Common Mode Rejection Ratio) ................................................................................
PSRR (Power Supply Rejection Ratio) ..................................................................................
AVOL (Open Loop/Large Signal Voltage Gain) ...........................................................................
VO (Voltage Swing) ..........................................................................................................
IO (Output Short Circuit Current) ..........................................................................................
IS (Supply Current) ..........................................................................................................
CMVR (Common Mode Voltage Range) .................................................................................
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List of Figures
1
Offset Voltage vs. VCM for LMP7731 (Typical Characteristics) ........................................................ 2
2
Percentage vs. TCVos Distribution for LMP7731 (Typical Characteristics) .......................................... 3
3
Input Bias Current vs. VCM For LMP7731 (Typical Characteristics)................................................. 5
4
Common Mode Rejection Ratio vs. Frequency For LMP7731 (Typical Characteristics) .......................... 6
5
Power Supply Rejection Ratio vs. Frequency For LMP7731 (Typical Characteristics) ............................ 7
List of Tables
1
Offset Voltage for LMP7731 (Electrical Characteristics) ............................................................... 2
2
Offset Voltage Drift for LMP7731 (Electrical Characteristics) ......................................................... 3
3
Input Current for LMP2011 (Electrical Characteristics) ................................................................ 4
4
Input Offset Current for LMP7731 (Electrical Characteristics) ........................................................ 4
5
Input Offset Current Drift for LMP7731 (Electrical Characteristics)
6
Bias Current for LMP7731 (Electrical Characteristics) ................................................................. 5
7
Common Mode Rejection Ratio for LMP7731 (Electrical Characteristics) .......................................... 6
8
Power Supply Rejection Ratio for LMP7731 (Electrical Characteristics) ............................................ 7
9
Large Signal Voltage Gain for LMP7731 (Electrical Characteristics) ................................................ 8
10
Offset Voltage for LMP7731 (Electrical Characteristics) ............................................................... 8
11
Output Short Circuit Current for LMP7731 (Electrical Characteristics)
12
13
..................................................
..............................................
Supply Current for LMP7731 (Electrical Characteristics) ..............................................................
Input Common-Mode Voltage Range for LMP7731 (Electrical Characteristics) ....................................
4
9
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1
Introduction
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Introduction
When looking at a datasheet, it is important to see at what voltage and conditions the part is specified.
The first column is the abbreviated symbol of the parameter. The second column is the name and
description of the parameter. In addition, there might be some added conditions to a particular parameter
located in the third column. There are three test conditions: Minimum, Typical, and Maximum values.
These are guaranteed values for the performance of this part. Also, for this parameter there are bolded
maximum values, which indicate the condition at temperature extremes. The last column states the unit of
the parameter.
In the "Typical Characteristics" section of this datasheet, there are various curves displaying different
parameters. These curves are used to help understand the specified values of the datasheet.
2
VOS (Input Offset Voltage)
In an ideal case, in any op-amp circuit, when 0V is applied to the input, 0V should be expected at the
output. In actuality, there is a voltage present at the output. This voltage is due to the number of
mismatches of the op-amp's internal transistors and resistance. The value of Vos is determined by the
voltage required to make the output voltage 0V.
Table 1. Offset Voltage for LMP7731 (Electrical Characteristics)(1)
Symbol
VOS
Parameter
Conditions
Input Offset Voltage
Min
Typ
Max
VCM = 4.5V
±6
±50
±120
VCM = 0.5V
±6
±40
±100
Units
μV
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The part in Figure 1, the LMP7731, is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to
V+/2. The offset voltage to the LMP7731 is specified at VCM = 4.5V and 0.5V instead of the usual 2.5V.
In Figure 1, the offset voltage is -6μV at 5V and 25°C.
Offset Voltage vs. Supply Voltage
5
25°C
OFFSET VOLTAGE (PV)
0
-5
-40°C
-10
-15
85°C
-20
-25
1.5
125°C
2
2.5
3
3.5
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
Figure 1. Offset Voltage vs. VCM for LMP7731 (Typical Characteristics)
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TCVOS (Input Offset Voltage Drift)
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TCVOS (Input Offset Voltage Drift)
TCVos is defined as the temperature coefficient of the offset voltage. The value of TCVos is determined by
the amount of change in input offset voltage per degree Celsius.
Table 2. Offset Voltage Drift for LMP7731 (Electrical Characteristics)(1)
Symbol
TCVOS
Parameter
Conditions
Input Offset Voltage Drift
Min
Typ
Max
VCM = 4.5V
±0.5
±1.0
VCM = 0.5V
±0.2
±0.8
Units
μV/°C
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
Like the offset voltage, the offset voltage drift has the conditions of VCM = 4.5V and 0.5V instead of the
usual 2.5V.
In the upper left corner of Figure 2, the parameters of the graph are shown, with the supply voltage at 3.3
and 5V, common mode voltage at 0.5V and the temperature range from -40 °C to 125 °C.
The TCVOS typical value for the LMP7731 according to Figure 2 is -0.2μV/°C.
TCVOS Distribution
25
VS = 3.3V, 5V
PERCENTAGE (%)
20
VCM = 0.5V
-40°C d TA d 125°C
15
10
5
0
-1.5
-1
-0.5
0
0.5
TCVOS (PV/°C)
Figure 2. Percentage vs. TCVos Distribution for LMP7731 (Typical Characteristics)
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IIN (Input Current)
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IIN (Input Current)
An ideal op-amp has no current flowing in the input terminals. In actuality, there are small currents that
flow through both input terminals. The input current is defined as the sum of the currents that flow into the
op-amp.
Table 3. Input Current for LMP2011 (Electrical Characteristics)
Symbol
IIN
Parameter
Conditions
Min
Input Current
(1)
Typ
Max
Units
-3
pA
(1) 5V DC Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TJ = 25°C, V+ = 5V, V− = 0V,
VCM = 2.5V and RL > 1MΩ.
The LMP2011 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VO = 2.5V, RL >1MΩ. There are no additional
conditions associated with this parameter.
5
IOS (Input Offset Current)
The difference between the currents flowing into the input terminals.
Table 4. Input Offset Current for LMP7731 (Electrical Characteristics)(1)(2)
Symbol
IOS
Parameter
Input Offset Current
Typ
Max
VCM = 4.5V
Conditions
Min
±1
±50
±70
VCM = 0.5V
±11
±65
±80
Units
nA
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
(2) Boldface limits apply at the temperature extremes.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the conditions of VCM = 4.5V and VCM = 0.5V.
6
TCIOS (Input Offset Current Drift)
The change in input offset current due to the change in temperature.
Table 5. Input Offset Current Drift for LMP7731 (Electrical Characteristics)(1)
Symbol
TCIOS
Parameter
Input Offset Current Drift
Conditions
VCM = 0.5V and VCM = 4.5V
Min
Typ
Max
0.0482
Units
nA/°C
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the conditions of VCM = 0.5V and VCM = 4.5V.
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IB (Bias Current)
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IB (Bias Current)
In an ideal op-amp circuit, there should be no current flowing in or out of the input terminals. But in
actuality, there is a small current that flows into both terminals. The bias current is calculated as the
average of the two input currents.
Table 6. Bias Current for LMP7731 (Electrical Characteristics)(1)(2)
Symbol
IB
Parameter
Conditions
Input Bias Current
Typ
Max
VCM = 4.5V
Min
±1.5
±30
±50
VCM = 0.5V
±14
±50
±85
Units
nA
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
(2) Boldface limits apply at the temperature extremes.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the conditions of VCM = 0.5V and VCM = 4.5V.
In the upper right corner of Figure 3, the conditions of this graph are shown with the supply voltage at 5V.
The input bias current value at VCM = 0.5V at 25°C is at 14nA
The input bias current value at VCM = 4.5V at 25°C is at 1.5nA
Input Bias Current vs. VCM
100
INPUT BIAS CURRENT (nA)
80
VS = 5V
125°C
60
40
85°C
25°C
20
0
-20
-40
-40°C
-60
-80
-100
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
VCM (V)
Figure 3. Input Bias Current vs. VCM For LMP7731 (Typical Characteristics)
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CMRR (Common Mode Rejection Ratio)
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CMRR (Common Mode Rejection Ratio)
This parameter is calculated as the change in input offset voltage with respect to the change in the
common mode voltage. CMRR is defined as 20*log(ΔVCM/ΔVOS) , in decibels (dB).
Table 7. Common Mode Rejection Ratio for LMP7731 (Electrical Characteristics)(1)
Symbol
CMRR
Parameter
Conditions
Common Mode Rejection Ratio
Min
Typ
0.15V ≤ VCM ≤ 0.7V
0.23 ≤ VCM ≤ 0.7V
101
89
120
1.5V ≤ VCM ≤ 4.85V
1.5V ≤ VCM ≤ 4.77V
105
99
130
Max
Units
dB
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the VCM conditions ranging between 0.15 and 0.7, 0.23 and 0.7, 1.5 and 4.85, and 1.5 and
4.77 volts.
In the upper right corner of Figure 4, the conditions of this parameter are given as the supply voltage at
2.5, 3.3, and 5 volts.
The CMRR for the LMP7731 at 5V is measured to be 130dB.
CMRR vs. Frequency
160
VS = 2.5V, 3.3V, 5V
140
CMRR (dB)
120
100
80
60
40
20
0
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 4. Common Mode Rejection Ratio vs. Frequency For LMP7731 (Typical Characteristics)
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PSRR (Power Supply Rejection Ratio)
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PSRR (Power Supply Rejection Ratio)
This parameter is calculated as the change in input offset voltage with respect to the change in power
supply voltage. PSRR is defined as 20*log(ΔVOS/ΔVSUPPLY) , in decibels (dB).
Table 8. Power Supply Rejection Ratio for LMP7731 (Electrical Characteristics)(1)
Symbol
PSRR
Parameter
Conditions
Power Supply Rejection Ratio
2.5V ≤ V+ ≤ 5V
1.8V ≤ V+ ≤ 5.5V
Min
Typ
111
105
129
Max
Units
dB
117
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the V+ conditions in the range of 2.5 to 5, and 1.8 to 5.5 volts.
The PSRR for the LMP7731 at 5V is measured to be 129dB.
PSRR vs. Frequency
0
-20
-PSRR
PSRR (dB)
-40
-60
VS = 5V
-80 V = 2.5V
S
+PSRR
-100
VS = 3.3V
-120
VS = 5V
-140
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 5. Power Supply Rejection Ratio vs. Frequency For LMP7731 (Typical Characteristics)
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AVOL (Open Loop/Large Signal Voltage Gain)
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AVOL (Open Loop/Large Signal Voltage Gain)
The ratio of the output signal to the input signal (the gain) of the amplifier without external feedback, in
decibels (dB).
Table 9. Large Signal Voltage Gain for LMP7731 (Electrical Characteristics)(1)
Symbol
AVOL
Parameter
Large Signal Voltage Gain
Conditions
Min
Typ
RL = 10 kΩ to V+/2
VO = 0.5V to 4.5V
112
104
130
RL = 2 kΩ to V+/2
VO = 0.5V to 4.5V
110
94
119
Max
Units
dB
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the RL = 10kΩ to V+/2 with VO from 0.5 to 4.5V and RL = 2kΩ to V+/2 with VO from 0.5 to
4.5V.
11
VO (Voltage Swing)
This is the maximum peak-to-peak voltage swing that can be inputted to the circuit without clipping the
signal.
Table 10. Output Swing High and Low for LMP7731 (Electrical Characteristics)
Table 10. Offset Voltage for LMP7731 (Electrical Characteristics)(1)
Symbol
VO
Parameter
Output Swing High
Output Swing Low
Typ
Max
RL = 10 kΩ to V+/2
Conditions
Min
8
50
75
RL = 2 kΩ to V+/2
24
50
75
RL = 10 kΩ to V+/2
9
50
75
RL = 2 kΩ to V+/2
23
50
75
Units
mV from
either
rail
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the RL = 10kΩ to V+/2 and RL = 2kΩ to V+/2.
8
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IO (Output Short Circuit Current)
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IO (Output Short Circuit Current)
The amount of current that is drawn from the output.
Table 11. Output Short Circuit Current for LMP7731 (Electrical Characteristics)(1)
Symbol
IO
Parameter
Output Short Circuit Current
Min
Typ
Sourcing, VO = V+/2
Conditions
33
27
47
Sinking, VO = V+/2
VIN (diff) = −100 mV
30
25
49
Max
Units
mA
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the VO = V+/2 with VIN (diff) = 100mV for sourcing and VO = V+/2 with VIN (diff) = -100mV for
sinking.
13
IS (Supply Current)
The current into the Vcc+ and Vcc- inputs required to operate the op amp.
Table 12. Supply Current for LMP7731 (Electrical Characteristics)(1)
Symbol
IS
Parameter
Supply current
(Per Channel)
Typ
Max
VCM = 4.5V
Conditions
Min
2.2
3.0
3.7
VCM = 0.5V
2.5
3.4
4.2
Units
mA
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the VCM=4.5 and 0.5V.
14
CMVR (Common Mode Voltage Range)
(Also called Input Voltage Range) The amplifier’s common mode voltage operation range. If the common
mode voltage has exceeded the limits, the op amp will not function as stated in the datasheet.
Table 13. Input Common-Mode Voltage Range for LMP7731 (Electrical Characteristics)(1)
Symbol
CMVR
Parameter
Input Common-Mode Voltage
Range
Conditions
Large Signal CMRR ≥ 80 dB
Min
0
Typ
Max
5
Units
V
(1) 5V Electrical Characteristics: Unless otherwise specified, all limits are guaranteed for TA = 25°C, V+ = 5V, V− = 0V,
VCM = V+/2, RL > 10 kΩ to V+/2.
The LMP7731 is specified at 5V, at 25 °C, V+ = 5V, V-= 0V, VCM = V+/2, RL >10kΩ to V+/2. This particular
parameter has the Large Signal CMRR ≥ 80dB.
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