TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Features
Description
Supply Current: 950nA Maximum /Amplifier
Stable 18kHz GBWP with 10mV/μs Slew Rate
Offset Voltage: 1.5mV Maximum
Ultra-low VOS TC: 0.5μV/°C
Ultra-low Input Bias Current: 1fA Typical
High 120dB Open-Loop Voltage Gain
Unity Gain Stable for 1,000nF Capacitive Load
Rail-to-Rail Input/Output Voltage Range
Outputs Source and Sink 20mA of Load Current
No Phase Reversal for Overdriven Inputs
Ultra-low Single-Supply Operation Down to +1.8V
Shutdown Current: 3nA Typical (TP2121N)
–40°C to 125°C Operation Range
Robust 8kV – HBM and 2kV – CDM ESD Rating
Green, Popular Type Package
Applications
Handsets and Mobile Accessories
Current Sensing
Wireless Remote Sensors, Active RFID Readers
Environment/Gas/Oxygen Sensors
Threshold Detectors/Discriminators
Low Power Filters
Battery or Solar Powered Devices
Sensor Network Powered by Energy Scavenging
The TP212x are ultra-low power, precision CMOS
op-amps featuring a maximum supply current of
950nA per amplifier with an ultra-low typical input
bias current of 1fA. Analog trim and calibration
routine reduce input offset voltage to below 1.5mV,
and the precision temperature compensation
technique makes offset voltage temperature drift at
0.5μV/°C, which allowing use of the TP212x in
systems with high gain without creating excessively
large output offset errors.
The TP212x are unity gain stable with 1,000nF
capacitive load with a constant 18kHz GBWP,
10mV/μs slew rate, which make them appropriate
for low frequency applications, such as battery
current monitoring and sensor conditioning. The
TP212x can operate from a single-supply voltage of
+1.8V to +6.0V or a dual-supply voltage of ±0.9V to
±3.0V. Beyond the rails input and rail-to-rail output
characteristics allow the full power-supply voltage to
be used for signal range.
The combined features make the TP212x ideal
choices for battery-powered applications because
they minimize errors due to power supply voltage
variations over the lifetime of the battery and
maintain high CMRR even for a rail-to-rail input
op-amp. Mobile accessories, wireless remote
sensing, backup battery sensors, and single-Li+ or
2-cell NiCd/Alkaline battery powered systems can
benefit from the features of the TP212x op-amps.
For applications that require power-down, the
TP2121N has a low-power shutdown mode that
reduces supply current to 3nA, and forces the output
into a high-impedance state.
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property
of their respective owners.
Ultra-low Supply Current Op-amps:
VOUT I CC R3 (
Supply Current
0.3 μA
0.6 μA
4 μA
GBWP
10 kHz
18 kHz
150 kHz
Single
TP2111
TP2121
TP1511
With Shut-down
TP2111N
TP2121N
TP1511N
Dual
TP2112
TP2122
TP1512
Quad
TP2114
TP2124
TP1514
R1
1)
R2
TP2121 in Low Side Battery Current Sensor
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REV1.2
1
TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Pin Configuration (Top View)
Order Information
Model Name
TP2121
TP2121U
TP2121N
TP2122
TP2124
Order Number
Package
Transport Media, Quantity
Marking
Information
TP2121-TR
5-Pin SOT23
Tape and Reel, 3,000
B2TYW (1)
TP2121-CR
5-Pin SC70
Tape and Reel, 3,000
B2CYW (1)
TP2121-SR
8-Pin SOIC
Tape and Reel, 4,000
2121S
TP2121U-TR
5-Pin SOT23
Tape and Reel, 3,000
B2UYW (1)
TP2121N-TR
6-Pin SOT23
Tape and Reel, 3,000
B2NYW (1)
TP2121N-VR
8-Pin MSOP
Tape and Reel, 3,000
2121N
TP2121N-SR
8-Pin SOIC
Tape and Reel, 4,000
2121NS
TP2122-SR
8-Pin SOIC
Tape and Reel, 4,000
B22S
TP2122-VR
8-Pin MSOP
Tape and Reel, 3,000
B22V
TP2124-SR
14-Pin SOIC
Tape and Reel, 2,500
B24S
TP2124-TR
14-Pin TSSOP
Tape and Reel, 3,000
B24T
Note (1): ‘YW’ is date coding scheme. 'Y' stands for calendar year, and 'W' stands for single workweek coding scheme.
Absolute Maximum Ratings Note 1
Supply Voltage: V+ – V–....................................6.0V
–
+
Input Voltage............................. V – 0.3 to V + 0.3
Input Current: +IN, –IN, SHDN
Note 2..............
±10mA
–
Output Short-Circuit Duration Note 3…......... Indefinite
Operating Temperature Range.......–40°C to 125°C
Maximum Junction Temperature................... 150°C
+
SHDN Pin Voltage……………………………V to V
Storage Temperature Range.......... –65°C to 150°C
Output Current: OUT.................................... ±20mA
Lead Temperature (Soldering, 10 sec) ......... 260°C
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum
Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The inputs are protected by ESD protection diodes to each power supply. If the input extends more than 500mV beyond the power supply, the input
current should be limited to less than 10mA.
2
REV1.2
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TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum. This depends on the power supply voltage and how many
amplifiers are shorted. Thermal resistance varies with the amount of PC board metal connected to the package. The specified values are for short traces
connected to the leads.
ESD, Electrostatic Discharge Protection
Symbol
Parameter
Condition
Minimum Level
Unit
HBM
Human Body Model ESD
MIL-STD-883H Method 3015.8
8
kV
CDM
Charged Device Model ESD
JEDEC-EIA/JESD22-C101E
2
kV
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REV1.2
3
TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
5V Electrical Characteristics
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 27°C.
VSUPPLY = 5V, VCM = VOUT = VSUPPLY/2, RL = 100kΩ, CL =60pF, VSHDN is unconnected.
SYMBOL
PARAMETER
VOS
VOS TC
Input Offset Voltage
Input Offset Voltage Drift
CONDITIONS
VCM = VDD/2 and VCM = GND
IB
Input Bias Current
TA=27 oC
TA=85 oC
TA=125 oC
IOS
Vn
en
RIN
Input Offset Current
Input Voltage Noise
Input Voltage Noise Density
Input Resistance
f = 0.1Hz to 10Hz
f = 1kHz
CIN
Input Capacitance
CMRR
Common Mode Rejection Ratio
Common-mode Input Voltage
Range
Power Supply Rejection Ratio
VCM
PSRR
AVOL
Open-Loop Large Signal Gain
VOL, VOH
ROUT
RO
ISC
VDD
IQ
PM
GM
GBWP
Output Swing from Supply Rail
Closed-Loop Output Impedance
Open-Loop Output Impedance
Output Short-Circuit Current
Supply Voltage
Quiescent Current per Amplifier
Phase Margin
Gain Margin
Gain-Bandwidth Product
Settling Time, 1.5V to 3.5V, Unity
Gain
Settling Time, 2.45V to 2.55V,
Unity Gain
tS
SR
Slew Rate
FPBW
IQ(off)
Full Power Bandwidth Note 2
Supply Current in Shutdown Note 1
ISHDN
Shutdown Pin Current Note 1
ILEAK
VIL
VIH
Output Leakage Current in
Shutdown Note 1
SHDN Input Low Voltage Note 1
SHDN Input High Voltage Note 1
Differential
Common Mode
VCM = 0.1V to 4.9V
VOUT = 2.5V, RLOAD = 100kΩ
VOUT = 0.1V to 4.9V, RLOAD = 100kΩ
RLOAD = 100kΩ
G = 1, f = 1kHz, IOUT = 0
f = 1kHz, IOUT = 0
Sink or source current
●
MIN
TYP
MAX
UNITS
-1.5
±0.1
0.5
1
700
45
1
6.5
170
>1
2.9
5
130
+1.5
mV
μV/°C
fA
fA
pA
fA
μVP-P
nV/√Hz
TΩ
●
80
●
V––0.3
●
●
●
60
80
80
92
120
120
5
0.4
2.6
20
600
61
-10
18
0.25
0.253
0.035
0.038
RLOAD = 100kΩ, CLOAD = 60pF
RLOAD = 100kΩ, CLOAD = 60pF
f = 1kHz
0.1%
0.01%
0.1%
0.01%
AV = 1, VOUT = 1.5V to 3.5V, CLOAD =
60pF, RLOAD = 100kΩ
2VP-P
VSHDN = 0.5V
VSHDN = 1.5V
VSHDN = 0V, VOUT = 0V
VSHDN = 0V, VOUT = 5V
Disable
Enable
●
●
dB
V++0.3
1.8
●
pF
6.0
950
V
dB
dB
dB
mV
Ω
Ω
mA
V
nA
°
dB
kHz
ms
10
mV/μs
600
3
-10
-10
-3.6
3.6
Hz
nA
pA
pA
0.5
1.0
Note 1: Specifications apply to the TP2121N with shutdown.
Note 2: Full power bandwidth is calculated from the slew rate FPBW = SR/π • VP-P.
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REV1.2
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V
V
TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Typical Performance Characteristics
Small-Signal Step Response, 100mV Step
Large-Signal Step Response, 2V Step
4
2.60
3
Gain = +1
VIN Step = 100mV
CLOAD = 60pF
2.50
Gain = +1
CLOAD = 60pF
RLOAD = 100kΩ
1V/div
50mV/div
2.55
2
2.45
2.40
3
5
7
9
1
2
2ms/div
11
Phase Margin vs. CLOAD (Stable for Any CLOAD)
80
150
100
Gain = +1
RLOAD = 100kΩ
60
Phase
Phase (dB)
GAIN AND PHASE (dB)
8
3ms/div
Open-Loop Gain and Phase
Gain
50
40
Gain = 1
RLOAD = 100kΩ
CLOAD = 60pF
0
-50
1E-3
1E-1
1E+1
20
1E+3
1E+5
1E+7
FREQUENCY (Hz)
0
1E+0
1E+1
1E+2
1E+3
1E+4
Load Capacitance (pF)
1E+5
1E+6
Input Voltage Noise Spectral Density
Common-Mode Rejection Ratio
150
10k
120
CMRR (dB)
Input Noise Voltage (nV/√Hz)
5
1k
90
60
100
1E-1
1E+0
1E+1
1E+2
FREQUENCY (Hz)
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1E+3
30
1E-3
1E-1
1E+1
1E+3
1E+5
1E+7
Frequency (Hz)
REV1.2
5
TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Typical Performance Characteristics
Over-Shoot Voltage, CLOAD = 40nF, Gain = +1, RFB=100kΩ
Over-Shoot % vs. CLOAD, Gain = +1, RFB = 1MΩ
60%
Overshoot and Undershoot (%)
2.6
50mV/div
2.55
2.5
Gain = +1
VIN Step = 100mV
CLOAD = 40nF
2.45
Gain = +1
VIN Step = 200mV
50%
40%
Overshoot
30%
Undershoot
20%
10%
2.4
0%
2
4
6
8
10
1E+1
1E+2
1E+3
2ms/div
1E+4
1E+5
1E+6
1E+7
Load Capacitance (pF)
Over-Shoot Voltage, CLOAD=40nF, Gain= -1, RFB=100kΩ
Over-Shoot % vs. CLOAD, Gain = -1, RFB = 1MΩ
60%
Overshoot and Undershoot (%)
2.6
50mV/div
2.55
Gain = -1
VIN Step = 100mV
CLOAD = 40nF
2.5
2.45
Gain = -1
VIN Step = 200mV
50%
Undershoot
40%
30%
Overshoot
20%
10%
2.4
6
8
10
12
0%
1E+0
14
1E+2
1E+4
1E+6
Load Capacitance (pF)
2ms/div
Power-Supply Rejection Ratio
VIN = -0.2V to 5.7V, No Phase Reversal
80
6.0
PSRRP
40
AMPLITUDE (V)
PSRRN/PSRRP (dB)
5.0
60
PSRRN
20
4.0
3.0
2.0
1.0
0.0
-1.0
0
0
1E-3
1E-2
1E-1
1E+0
1E+1
1E+2
1E+3
1E+4
10
20
30
40
50
60
1E+5
TIME (ms)
Frequency (Hz)
6
REV1.2
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TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Typical Performance Characteristics
Quiescent Supply Current vs. Temperature
Open-Loop Gain vs. Temperature
750.0
130
OPEN LOOP GAIN (dB)
CURRENT (nA)
700.0
650.0
600.0
550.0
500.0
-40
-20
0
20
40
60
80
120
110
100
100
-40
-20
0
20
40
60
80
100
TEMPERATURE (OC)
TEMPERATURE (OC)
Short-Circuit Current vs. Supply Voltage
SHORT-CIRCUIT CURRENT (mA)
Quiescent Supply Current vs. Supply Voltage
750.0
700.0
85OC
CURRENT (nA)
650.0
600.0
27OC
550.0
-40OC
500.0
450.0
400.0
1.8
2.6
3.4
4.2
30
25
20
15
10
5
0
1.8
5
2.8
3.8
4.8
POWER SUPPLY VOLTAGE (V)
POWER SUPPLY VOLTAGE (V)
Input Offset Voltage Distribution
Input Offset Voltage vs. Common Mode Input Voltage
400
0.4
Production Package Units
VDD=5V, VCM 200 pF when G = +1V/V), a small series
resistor at the output (RISO in Figure 2) improves the feedback loop’s phase margin and stability by making the output
load resistive at higher frequencies.
Figure 2
Power Supply Layout and Bypass
The TP212x OPA’s power supply pin (VDD for single-supply) should have a local bypass capacitor (i.e., 0.01μF to
0.1μF) within 2mm for good high frequency performance. It can also use a bulk capacitor (i.e., 1μF or larger) within
100mm to provide large, slow currents. This bulk capacitor can be shared with other analog parts.
Ground layout improves performance by decreasing the amount of stray capacitance and noise at the OPA’s inputs
and outputs. To decrease stray capacitance, minimize PC board lengths and resistor leads, and place external
components as close to the op amps’ pins as possible.
Proper Board Layout
To ensure optimum performance at the PCB level, care must be taken in the design of the board layout. To avoid
leakage currents, the surface of the board should be kept clean and free of moisture. Coating the surface creates a
barrier to moisture accumulation and helps reduce parasitic resistance on the board.
Keeping supply traces short and properly bypassing the power supplies minimizes power supply disturbances due to
output current variation, such as when driving an ac signal into a heavy load. Bypass capacitors should be connected
as closely as possible to the device supply pins. Stray capacitances are a concern at the outputs and the inputs of the
amplifier. It is recommended that signal traces be kept at least 5mm from supply lines to minimize coupling.
A variation in temperature across the PCB can cause a mismatch in the Seebeck voltages at solder joints and other
points where dissimilar metals are in contact, resulting in thermal voltage errors. To minimize these thermocouple
effects, orient resistors so heat sources warm both ends equally. Input signal paths should contain matching numbers
and types of components, where possible to match the number and type of thermocouple junctions. For example,
dummy components such as zero value resistors can be used to match real resistors in the opposite input path.
10
REV1.2
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TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Matching components should be located in close proximity and should be oriented in the same manner. Ensure leads
are of equal length so that thermal conduction is in equilibrium. Keep heat sources on the PCB as far away from
amplifier input circuitry as is practical.
The use of a ground plane is highly recommended. A ground plane reduces EMI noise and also helps to maintain a
constant temperature across the circuit board.
BATTERY CURRENT SENSING
The Common Mode Input voltage Range of TP212x OPA series, which goes 0.3V beyond both supply rails, supports
their use in high-side and low-side battery current sensing applications. The low quiescent current (600nA, typical)
helps prolong battery life, and the rail-to-rail output supports detection of low currents.
The battery current (IDD) through the 10Ω resistor causes its top terminal to be more negative than the bottom terminal.
This keeps the Common Mode Input voltage below VDD, which is within its allowed range. The output of the OPA will
also be blow VDD, within its Maximum Output Voltage Swing specification.
I DD
VDD VOUT
R1
R3
R2
Figure 3
Instrumentation Amplifier
The TP212x OPA series is well suited for conditioning sensor signals in battery-powered applications. Figure 4 shows
a two op-amp instrumentation amplifier, using the TP212x OPA.
The circuit works well for applications requiring rejection of Common Mode noise at higher gains. The reference
voltage (VREF) is supplied by a low-impedance source. In single voltage supply applications, VREF is typically VDD/2.
VOUT =(V1 V2 )(1
R1 2 R1
) VREF
R2 RG
Figure 4
Buffered Chemical Sensor (pH) Probe
The TP212x OPA has input bias current in the pA range. This is ideal in buffering high impedance chemical sensors
such as pH probe. As an example, the circuit in Figure 5 eliminates expansive low-leakage cables that that is
required to connect pH probe to metering ICs such as ADC, AFE and/or MCU. A TP212x OPA and a lithium battery
are housed in the probe assembly. A conventional low-cost coaxial cable can be used to carry OPA’s output signal to
subsequent ICs for pH reading.
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TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Figure 5: Buffer pH Probe
Portable Gas Sensor Amplifier
Gas sensors are used in many different industrial and medical applications. Gas sensors generate a current that is
proportional to the percentage of a particular gas concentration sensed in an air sample. This output current flows
through a load resistor and the resultant voltage drop is amplified. Depending on the sensed gas and sensitivity of the
sensor, the output current can be in the range of tens of microamperes to a few milli-amperes. Gas sensor datasheets
often specify a recommended load resistor value or a range of load resistors from which to choose.
There are two main applications for oxygen sensors – applications which sense oxygen when it is abundantly present
(that is, in air or near an oxygen tank) and those which detect traces of oxygen in parts-per-million concentration. In
medical applications, oxygen sensors are used when air quality or oxygen delivered to a patient needs to be monitored.
In fresh air, the concentration of oxygen is 20.9% and air samples containing less than 18% oxygen are considered
dangerous. In industrial applications, oxygen sensors are used to detect the absence of oxygen; for example,
vacuum-packaging of food products.
The circuit in Figure 6 illustrates a typical implementation used to amplify the output of an oxygen detector. With the
components shown in the figure, the circuit consumes less than 600nA of supply current ensuring that small
form-factor single- or button-cell batteries (exhibiting low mAh charge ratings) could last beyond the operating life of
the oxygen sensor. The precision specifications of these amplifiers, such as their low offset voltage, low VOS TC, low
input bias current, high CMRR, and high PSRR are other factors which make these amplifiers excellent choices for this
application.
I O2
VOUT 1Vin Air ( 21% O 2 )
I DD 0.7uA
Figure 6
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TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Package Outline Dimensions
SOT23-5 / SOT23-6
Symbol
Dimensions
Dimensions
In Millimeters
In Inches
Min
Max
Min
Max
A1
0.000
0.100
0.000
0.004
A2
1.050
1.150
0.041
0.045
b
0.300
0.400
0.012
0.016
D
2.820
3.020
0.111
0.119
E
1.500
1.700
0.059
0.067
E1
2.650
2.950
0.104
0.116
e
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0.950TYP
0.037TYP
e1
1.800
2.000
0.071
0.079
L1
0.300
0.460
0.012
0.024
θ
0°
8°
0°
8°
REV1.2
13
TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Package Outline Dimensions
SC-70-5 / SC-70-6 (SOT353 / SOT363)
Symbol
Dimensions
Dimensions In
In Millimeters
Inches
Min
Max
Min
Max
A1
0.000
0.100
0.000
0.004
A2
0.900
1.000
0.035
0.039
b
0.150
0.350
0.006
0.014
C
0.080
0.150
0.003
0.006
D
2.000
2.200
0.079
0.087
E
1.150
1.350
0.045
0.053
E1
2.150
2.450
0.085
0.096
e
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REV1.2
0.650TYP
0.026TYP
e1
1.200
1.400
0.047
0.055
L1
0.260
0.460
0.010
0.018
θ
0°
8°
0°
8°
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TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Package Outline Dimensions
SO-8 (SOIC-8)
A2
C
θ
L1
A1
e
E
D
Symbol
E1
Dimensions
Dimensions In
In Millimeters
Inches
Min
Max
Min
Max
A1
0.100
0.250
0.004
0.010
A2
1.350
1.550
0.053
0.061
b
0.330
0.510
0.013
0.020
C
0.190
0.250
0.007
0.010
D
4.780
5.000
0.188
0.197
E
3.800
4.000
0.150
0.157
E1
5.800
6.300
0.228
0.248
e
b
1.270TYP
0.050TYP
L1
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
Package Outline Dimensions
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REV1.2
15
TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
MSOP-8
Dimensions
Dimensions In
In Millimeters
Inches
Min
Max
Min
Max
A
0.800
1.200
0.031
0.047
A1
0.000
0.200
0.000
0.008
A2
0.760
0.970
0.030
0.038
b
0.30 TYP
0.012 TYP
C
0.15 TYP
0.006 TYP
D
2.900
e
0.65 TYP
E
2.900
3.100
0.114
0.122
E1
4.700
5.100
0.185
0.201
L1
0.410
0.650
0.016
0.026
θ
0°
6°
0°
6°
Symbol
E
E1
e
b
D
3.100
0.114
0.122
0.026
A1
R1
R
θ
L1
16
REV1.2
L
L2
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TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Package Outline Dimensions
SO-14 (SOIC-14)
Dimensions
In Millimeters
Symbol
MIN
TYP
MAX
A
1.35
1.60
1.75
A1
0.10
0.15
0.25
A2
1.25
1.45
1.65
b
0.36
D
8.53
8.63
8.73
E
5.80
6.00
6.20
E1
3.80
3.90
4.00
e
L
1.27 BSC
0.45
0.60
L1
1.04 REF
L2
0.25 BSC
θ
www.3peakic.com
0.49
0°
0.80
8°
REV1.2
17
TP2121/TP2121N/TP2122/TP2124
1.8V, 600nA Nanopower, Rail-to-Rail Input/Output Op-amps
Package Outline Dimensions
TSSOP-14
Dimensions
E1
E
e
A
A2
c
D
Symbol
In Millimeters
MIN
TYP
MAX
A
-
-
1.20
A1
0.05
-
0.15
A2
0.90
1.00
1.05
b
0.20
-
0.28
c
0.10
-
0.19
D
4.86
4.96
5.06
E
6.20
6.40
6.60
E1
4.30
4.40
4.50
e
L
A1
R1
R
0.65 BSC
0.45
0.60
L1
1.00 REF
L2
0.25 BSC
0.75
R
0.09
-
-
θ
0°
-
8°
θ
L1
18
REV1.2
L
L2
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