TP1561N-VR [3PEAK]
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps;型号: | TP1561N-VR |
厂家: | 3PEAK |
描述: | Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps |
文件: | 总16页 (文件大小:1757K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
TP1561/ TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Features
Description
The TP156x series are CMOS single, dual, and
quad RRIO op-amps with low offset, low power and
stable high frequency response. They incorporate
3PEAK’s proprietary and patented design
techniques to achieve very good AC performance
with 3.8MHz bandwidth, 3.6V/μs slew rate and low
distortion while drawing only 130μA of quiescent
current per amplifier. The input common-mode
voltage range extends 300mV beyond V– and V+, and
the outputs swing rail-to-rail. The TP156x family can
be used as plug-in replacements for many
commercially available op-amps to reduce power
and improve input/output range and performance.
Stable 3.8 MHz GBWP Over Temperature Range
Stable 3.8 MHz GBWP in VCM from 0-V to VDD
Very Low Supply Current: 130 μA per Amplifier
Unity Gain Stable for Any Capacitive Load
Offset Voltage: 3.0 mV Maximum
Offset Voltage Temperature Drift: 0.6 μV/°C
Input Bias Current: 1 pA Typical
THD+Noise: -115 dB at 1kHz, -99 dB at 10kHz
High CMRR/PSRR: 120 dB
Beyond the Rails Input Common-Mode Range
Outputs Swing to within 5 mV of Each Rail
No Phase Reversal for Overdriven Inputs
Drives 2 kΩ Resistive Loads
The TP156x Op-amps are unity gain stable with any
capacitive load. They operate from either single
+2.1V to +6.0V supply or dual ±1.05V to ±3.0V
supplies. Analog trim and calibration routine reduce
input offset voltage to below 3.0mV, and proprietary
precision temperature compensation technique
makes offset voltage temperature drift at 0.6μV/°C.
Adaptive biasing and dynamic compensation
enables the TP156x to achieve ‘THD +Noise’ for
1kHz/10kHz 2VPP signal at -115dB/ -99dB. Beyond
the rails input and rail-to-rail output characteristics
allow the full power-supply voltage to be used for
signal range.
Shutdown Current: 0.2 μA (TP1561N)
Supply Voltage Range:
-
-
Single +2.1 V to +6.0 V Supply
Or Dual ±1.05 V to ±3.0 V Supplies
–40°C to 125°C Operation Temperature Range
ESD Rating: 8KV – HBM, 2KV–CDM and 500V–MM
Green, Popular Type Package
The combination of features makes the TP156x
ideal choices for audio amplification of computers,
sound ports, and other consumer Audio. The
TP156x Op-amp is very stable, and it is capable of
driving heavy capacitive loads such as those found
in LCDs. The ability to swing rail-to-rail at the inputs
and outputs enables designers to buffer CMOS
DACs, ASICs, or other wide output swing devices in
single-supply systems.
Applications
Multimedia Audio
Headphone Drivers
LCD Drivers
Photo Diode Pre-amp
Medical Equipments
Portable Devices
ASIC Input or Output
Sensor Interfaces
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property
of their respective owners.
Pin Configuration(Top View)
TP1561
5-Pin SOT23/SC70
TP1561N
6-Pin SOT23
TP1562
8-Pin SOIC/MSOP
TP1564
14-Pin SOIC/TSSOP
-T and -C Suffixes
-T Suffix
-S and -V Suffixes
-S and -T Suffixes
1
2
3
4
5
6
7
14
13 ﹣In D
Out A
﹣In A
﹢In A
﹢Vs
Out D
1
2
3
5
4
1
2
3
6
5
4
﹢Vs
SHDN
-In
1
2
3
4
8
7
6
5
Out
Out
﹣Vs
+In
Out A
﹢Vs
﹢Vs
﹣In A
Out B
﹣In B
﹢In B
A
﹣Vs
A
B
D
C
12
11
﹢In D
﹣Vs
+In
-In
﹢In A
﹣Vs
B
10 ﹢In C
﹢In B
﹣In B
Out B
TP1561
TP1561N
8-Pin MSOP/SOIC
8-Pin MSOP/SOIC
9
8
﹣In C
TP1561U
5-Pin SOT23
-V and -S Suffixes
-V and -S Suffixes
Out C
-T Suffix
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
NC
﹣In
﹢In
﹣Vs
NC
NC
﹣In
﹢In
﹣Vs
SHDN
﹣Vs
1
2
3
5
4
﹢Vs
Out
NC
Out
﹢Vs
﹢Vs
Out
NC
+In
-In
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REV1.2
1
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Note 1
Absolute Maximum Ratings
Supply Voltage: V+ – V–....................................7.5V
Input Voltage............................. V– – 0.5 to V+ + 0.5
Input Current: +IN, –IN, SHDN Note 2.............. ±10mA
SHDN Pin Voltage……………………………V– to V+
Output Current: OUT.................................... ±45mA
Output Short-Circuit Duration Note 3…......... Indefinite
Operating Temperature Range.......–40°C to 125°C
Maximum Junction Temperature................... 150°C
Storage Temperature Range.......... –65°C to 150°C
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.
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
HBM
MM
Parameter
Human Body Model ESD
Machine Model ESD
Condition
Minimum Level
Unit
kV
MIL-STD-883H Method 3015.8
JEDEC-EIA/JESD22-A115
JEDEC-EIA/JESD22-C101E
8
500
2
V
CDM
Charged Device Model ESD
kV
Order Information
Marking
Information
A6TYW (1)
A6CYW (1)
A61V
Model Name
Order Number
Package
Transport Media, Quantity
Tape and Reel, 3000
TP1561-TR
TP1561-CR
TP1561-VR
TP1561-SR
TP1561U-TR
TP1561N-TR
TP1561N-SR
TP1561N-VR
TP1562-SR
TP1562-VR
TP1564-SR
TP1564-TR
5-Pin SOT23
5-Pin SC70
8-Pin MSOP
8-Pin SOIC
5-Pin SOT23
6-Pin SOT23
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
14-Pin SOIC
14-Pin TSSOP
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 2500
Tape and Reel, 3000
TP1561
A61S
TP1561U
TP1561N
A6UYW (1)
A6NYW (1)
A61NS
A61NV
A62S
TP1562
TP1564
A62V
A64S
A64T
Note (1): ‘YW’ is date coding scheme. 'Y' stands for calendar year, and 'W' stands for single workweek coding scheme.
REV1.2
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2
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
5V Electrical Characteristics
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 27°C.
SUPPLY = 5V, VCM = VOUT = VSUPPLY/2, RL = 100KΩ, CL =100pF, VSHDN is unconnected.
V
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VOS
Input Offset Voltage
VCM = VDD/2
●
-3.0
±0.1
+3.0
mV
VOS TC
IB
Input Offset Voltage Drift
Input Bias Current
0.6
1.0
μV/°C
pA
IOS
Vn
Input Offset Current
Input Voltage Noise
1.0
2.4
27
14
> 100
2.0
3.5
pA
μVP-P
f = 0.1Hz to 10Hz
f = 1kHz
f = 10kHz
en
Input Voltage Noise Density
Input Resistance
nV/√Hz
GΩ
pF
RIN
Differential
Common Mode
VCM = 0.1V to 4.9V
CIN
Input Capacitance
CMRR
VCM
Common Mode Rejection Ratio
Common-mode Input Voltage
Range
●
●
80
120
dB
V––0.3
V++0.3
V
PSRR
AVOL
Power Supply Rejection Ratio
●
●
●
80
80
72
120
110
102
5
0.4
2.6
45
dB
dB
dB
mV
Ω
Ω
mA
V
V
OUT = 2.5V, RLOAD = 100kΩ
Open-Loop Large Signal Gain
VOUT = 0.1V to 4.9V, RLOAD = 100kΩ
RLOAD = 100kΩ
G = 1, f = 1kHz, IOUT = 0
f = 100kHz, IOUT = 0
VOL, VOH
ROUT
RO
ISC
VDD
Output Swing from Supply Rail
Closed-Loop Output Impedance
Open-Loop Output Impedance
Output Short-Circuit Current
Supply Voltage
Sink or source current
2.1
1.0
6.0
190
IQ
IQ(off)
Quiescent Current per Amplifier
Supply Current in Shutdown Note 1
●
130
0.2
-0.15
-0.15
-20
μA
μA
VSHDN = 0.5V
ISHDN
ILEAK
Shutdown Pin Current Note 1
μA
V
SHDN = 1.5V
VSHDN = 0V, VOUT = 0V
SHDN = 0V, VOUT = 5V
Output Leakage Current in
Shutdown Note 1
SHDN Input Low Voltage Note 1
SHDN Input High Voltage Note 1
Turn-On Time Note 1
Turn-Off Time Note 1
Phase Margin
Gain Margin
Gain-Bandwidth Product
Settling Time, 1.5V to 3.5V, Unity 0.1%
Gain
Settling Time, 2.45V to 2.55V,
Unity Gain
pA
V
20
VIL
VIH
tON
tOFF
PM
GM
GBWP
Disable
Enable
●
●
0.5
V
V
μs
μs
°
SHDN Toggle from 0V to 5V
SHDN Toggle from 5V to 0V
RLOAD = 100kΩ, CLOAD = 100pF
RLOAD = 100kΩ, CLOAD = 100pF
f = 1kHz
20
20
66
-15
3.8
0.7
0.8
0.1
0.2
dB
MHz
0.01%
0.1%
0.01%
tS
μs
AV = 1, VOUT = 1.5V to 3.5V, CLOAD
100pF, RLOAD = 100kΩ
2VP-P
f=1kHz, AV=1, RL=100kΩ, VOUT = 2VPP
f=10kHz, AV=1, RL=100kΩ, VOUT = 2VPP
=
SR
Slew Rate
3.6
V/μs
kHz
dB
FPBW
THD+N
Full Power Bandwidth Note 2
Total Harmonic Distortion and
Noise
500
-115
-99
Note 1: Specifications apply to the TP1561N with shutdown.
Note 2: Full power bandwidth is calculated from the slew rate FPBW = SR/π • VP-P.
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REV1.2
3
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Typical Performance Characteristics
Small-Signal Step Response, 100mV Step
Large-Signal Step Response, 2V Step
Open-Loop Gain and Phase
Phase Margin vs. CLOAD (Stable for Any CLOAD)
Input Voltage Noise Spectral Density
Common-Mode Rejection Ratio
REV1.2
www.3peakic.com
4
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Typical Performance Characteristics
Over-Shoot Voltage, CLOAD = 40nF, Gain = +1
Over-Shoot % vs. CLOAD, Gain = -1, RFB = 20kΩ
Small-Signal Over-Shoot % vs. CLOAD, Gain = +1
VIN = -0.2V to 5.7V, No Phase Reversal
Over-Shoot Voltage, CLOAD=40nF, Gain= -1, RFB=100kΩ
Power-Supply Rejection Ratio
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REV1.2
5
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Typical Performance Characteristics
Quiescent Supply Current vs. Temperature
Open-Loop Gain vs. Temperature
Short-Circuit Current vs. Supply Voltage
Closed-Loop Output Impedance vs. Frequency
Quiescent Supply Current vs. Supply Voltage
Input Offset Voltage Distribution
REV1.2
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6
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Pin Functions
–IN: Inverting Input of the Amplifier. Voltage range
-VS: Negative Power Supply. It is normally tied to
ground. It can also be tied to a voltage other than
ground as long as the voltage between V+ and V– is
from 2.1V to 5.25V. If it is not connected to ground,
bypass it with a capacitor of 0.1μF as close to the
part as possible.
of this pin can go from V– – 0.3V to V+ + 0.3V.
+IN: Non-Inverting Input of Amplifier. This pin has
the same voltage range as –IN.
+VS: Positive Power Supply. Typically the voltage is
from 2.1V to 5.25V. Split supplies are possible as
long as the voltage between V+ and V– is between
2.1V and 5.25V. A bypass capacitor of 0.1μF as
close to the part as possible should be used
between power supply pins or between supply pins
and ground.
SHDN: Active Low Shutdown. Shutdown threshold
is 1.0V above negative supply rail. If unconnected,
the amplifier is automatically enabled.
OUT: Amplifier Output. The voltage range extends
to within millivolts of each supply rail.
N/C: No Connection.
Operation
The TP156x family input signal range extends
beyond the negative and positive power supplies.
The output can even extend all the way to the
negative supply. The input stage is comprised of
two CMOS differential amplifiers, a PMOS stage
and NMOS stage that are active over different
ranges of common mode input voltage. The
Class-AB control buffer and output bias stage uses
a proprietary compensation technique to take full
advantage of the process technology to drive very
high capacitive loads. This is evident from the
transient over shoot measurement plots in the
Typical Performance Characteristics.
Applications Information
Low Supply Voltage and Low Power Consumption
The TP156x family of operational amplifiers can operate with power supply voltages from 2.1 V to 6.0 V. Each
amplifier draws only 130 μA quiescent current. The low supply voltage capability and low supply current are ideal
for portable applications demanding high capacitive load driving capability and stable wide bandwidth. The
TP156x family is optimized for wide bandwidth low power applications. They have an industry leading high GBWP
to power ratio and are unity gain stable for any capacitive load. When the load capacitance increases, the
increased capacitance at the output pushed the non-dominant pole to lower frequency in the open loop frequency
response, lowering the phase and gain margin. Higher gain configurations tend to have better capacitive drive
capability than lower gain configurations due to lower closed loop bandwidth and hence higher phase margin.
Low Input Referred Noise
The TP156x family provides a low input referred noise density of 27 nV/√Hz at 1 kHz. The voltage noise will grow
slowly with the frequency in wideband range, and the input voltage noise is typically 2.4 μVP-P at the frequency of
0.1 Hz to 10 Hz.
Low Input Offset Voltage
The TP156x family has a low offset voltage of 3.0 mV maximum which is essential for precision applications. The
offset voltage is trimmed with a proprietary trim algorithm to ensure low offset voltage for precision signal
processing requirement.
Low Input Bias Current
The TP156x family is a CMOS OPA family and features very low input bias current in pA range. The low input
bias current allows the amplifiers to be used in applications with high resistance sources. Care must be taken to
minimize PCB Surface Leakage. See below section on “PCB Surface Leakage” for more details.
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REV1.2
7
TP1561/ TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
PCB Surface Leakage
In applications where low input bias current is critical, Printed Circuit Board (PCB) surface leakage effects need to
be considered. Surface leakage is caused by humidity, dust or other contamination on the board. Under low
humidity conditions, a typical resistance between nearby traces is 1012 Ω. A 5 V difference would cause 5 pA of
current to flow, which is greater than the TP156x OPA’s input bias current at +27°C (±1pA, typical). It is
recommended to use multi-layer PCB layout and route the OPA’s -IN and +IN signal under the PCB surface.
The effective way to reduce surface leakage is to use a guard ring around sensitive pins (or traces). The guard
ring is biased at the same voltage as the sensitive pin. An example of this type of layout is shown in Figure 1 for
Inverting Gain application.
1. For Non-Inverting Gain and Unity-Gain Buffer:
a) Connect the non-inverting pin (VIN+) to the input with a wire that does not touch the PCB surface.
b) Connect the guard ring to the inverting input pin (VIN–). This biases the guard ring to the Common Mode input voltage.
2. For Inverting Gain and Trans-impedance Gain Amplifiers (convert current to voltage, such as photo detectors):
a) Connect the guard ring to the non-inverting input pin (VIN+). This biases the guard ring to the same reference voltage as
the op-amp (e.g., VDD/2 or ground).
b) Connect the inverting pin (VIN–) to the input with a wire that does not touch the PCB surface.
Figure 1
Ground Sensing and Rail to Rail Output
The TP156x family has excellent output drive capability, delivering over 10 mA of output drive current. The output
stage is a rail-to-rail topology that is capable of swinging to within 10mV of either rail. Since the inputs can go 300
mV beyond either rail, the op-amp can easily perform ‘true ground’ sensing.
The maximum output current is a function of total supply voltage. As the supply voltage to the amplifier increases,
the output current capability also increases. Attention must be paid to keep the junction temperature of the IC
below 150°C when the output is in continuous short-circuit. The output of the amplifier has reverse-biased ESD
diodes connected to each supply. The output should not be forced more than 0.5V beyond either supply,
otherwise current will flow through these diodes.
ESD
The TP156x family has reverse-biased ESD protection diodes on all inputs and output. Input and out pins can
not be biased more than 300 mV beyond either supply rail.
Feedback Components and Suppression of Ringing
Care should be taken to ensure that the pole formed by the feedback resistors and the parasitic capacitance at
the inverting input does not degrade stability. For example, in a gain of +2 configuration with gain and feedback
resistors of 10k, a poorly designed circuit board layout with parasitic capacitance of 5 pF (part +PC board) at the
amplifier’s inverting input will cause the amplifier to ring due to a pole formed at 3.2 MHz. An additional capacitor
of 5 pF across the feedback resistor as shown in Figure 2 will eliminate any ringing.
Careful layout is extremely important because low power signal conditioning applications demand
high-impedance circuits. The layout should also minimize stray capacitance at the OPA’s inputs. However some
stray capacitance may be unavoidable and it may be necessary to add a 2 pF to 10 pF capacitor across the
feedback resistor. Select the smallest capacitor value that ensures stability.
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REV1.2
8
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Figure 2
Shut-down
The single channel OPA versions have SHDN pins that can shut down the amplifier to less than 0.2 μA supply
current. The SHDN pin voltage needs to be within 0.5 V of V– for the amplifier to shut down. During shutdown, the
output will be in high output resistance state, which is suitable for multiplexer applications. When left floating, the
SHDN pin is internally pulled up to the positive supply and the amplifier remains enabled.
Driving Large Capacitive Load
The TP156x family of OPA is designed to drive large capacitive loads. Refer to Typical Performance
Characteristics for “Phase Margin vs. Load Capacitance”. As always, larger load capacitance decreases overall
phase margin in a feedback system where internal frequency compensation is utilized. As the load capacitance
increases, the feedback loop’s phase margin decreases, and the closed-loop bandwidth is reduced. This
produces gain peaking in the frequency response, with overshoot and ringing in output step response. The
unity-gain buffer (G = +1V/V) is the most sensitive to large capacitive loads.
When driving large capacitive loads with the TP156x OPA family (e.g., > 200 pF when G = +1V/V), a small series
resistor at the output (RISO in Figure 3) improves the feedback loop’s phase margin and stability by making the
output load resistive at higher frequencies.
Figure 3
Power Supply Layout and Bypass
The TP156x OPA’s power supply pin (VDD for single-supply) should have a local bypass capacitor (i.e., 0.01 μF to
0.1 μF) within 2 mm 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.
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REV1.2
9
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
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. 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.
Instrumentation Amplifier
The TP156x op-amp series is well suited for conditioning sensor signals in battery-powered applications. Figure 4
shows a two op-amp instrumentation amplifier, using the TP156x op-amps.
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.
R
2R
1 ) VREF
R2 RG
1
VOUT =(V V2 )(1
1
Figure 4
Gain-of-100 Amplifier Circuit
Figure 5 shows a Gain-of-100 amplifier circuit using two TP156x op-amps. It draws 74 uA total current from
supply rail, and has a -3dB frequency at 100kHz.
Figure 6 shows the small signal frequency response of the circuit.
Figure 5: 100kHz, 74μA Gain-of-100 Amplifier
REV1.2
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10
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Figure 6: Frequency response of 100kHz, 74uA Gain-of-100 Amplifier
Buffered Chemical Sensor (pH) Probe
The TP156x op-amp 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 7 eliminates expansive low-leakage cables that
that is required to connect pH probe to metering ICs such as ADC, AFE and/or MCU. A TP156x op-amp 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.
Figure 7: Buffer pH Probe
Two-Pole Micro-power Sallen-Key Low-Pass Filter
Figure 8 shows a micro-power two-pole Sallen-Key Low-Pass Filter with 400Hz cut-off frequency. For best
results, the filter’s cut-off frequency should be 8 to 10 times lower than the OPA’s crossover frequency. Additional
OPA’s phase margin shift can be avoided if the OPA’s bandwidth-to-signal ratio is greater than 8. The design
equations for the 2-pole Sallen-Key low-pass filter are given below with component values selected to set a
400Hz low-pass filter cutoff frequency:
R1= R2 = R = 1M
C1= C2 = C = 400pF
Q = Filter Peaking Factor = 1
f-3dB = 1/(2 RC) = 400Hz
R3 = R4 /(2-1/Q) ; with Q = 1, R3 =R4
Figure 8
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REV1.2
11
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
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 9 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 37μA 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 TC-VOS,
low input bias current, high CMRR, and high PSRR are other factors which make these amplifiers excellent
choices for this application.
10MOhm
1%
100KOhm
1%
Vout
Oxygen Sensor
City Technology
4OX2
100KOhm
1%
VOUT 1Vin Air ( 21% O2 )
IDD 0.7uA
I
100Ohm
1%
O2
Figure 9
REV1.2
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12
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Package Outline Dimensions
SC70-5 /SOT-353
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A
0.900
0.000
0.900
0.150
0.080
2.000
1.150
2.150
0.650TYP
1.200
0.525REF
0.260
0°
1.100
0.100
1.000
0.350
0.150
2.200
1.350
2.450
0.035
0.000
0.035
0.006
0.003
0.079
0.045
0.085
0.026TYP
0.047
0.021REF
0.010
0°
0.043
0.004
0.039
0.014
0.006
0.087
0.053
0.096
A1
A2
b
C
D
E
E1
e
e1
L
1.400
0.055
L1
θ
0.460
8°
0.018
8°
SOT23-5 (SOT23-6)
Dimensions
Dimensions In
Inches
Symbol
In Millimeters
Min
Max
Min
Max
A
1.050
0.000
1.050
0.300
0.100
2.820
1.500
2.650
0.950TYP
1.800
0.700REF
0.300
0°
1.250
0.100
1.150
0.400
0.200
3.020
1.700
2.950
0.041
0.000
0.041
0.012
0.004
0.111
0.059
0.104
0.037TYP
0.071
0.028REF
0.012
0°
0.049
0.004
0.045
0.016
0.008
0.119
0.067
0.116
A1
A2
b
C
D
E
E1
e
e1
L
2.000
0.079
L1
θ
0.460
8°
0.024
8°
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REV1.2
13
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Package Outline Dimensions
SO-8
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A
1.350
0.100
1.350
0.330
0.190
4.780
3.800
5.800
1.270TYP
0.400
0°
1.750
0.250
1.550
0.510
0.250
5.000
4.000
6.300
0.053
0.004
0.053
0.013
0.007
0.188
0.150
0.228
0.050TYP
0.016
0°
0.069
0.010
0.061
0.020
0.010
0.197
0.157
0.248
A1
A2
B
C
D
E
E1
e
L1
θ
1.270
8°
0.050
8°
MSOP-8
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A
0.800
0.000
0.760
0.30 TYP
0.15 TYP
2.900
0.65 TYP
2.900
4.700
0.410
0°
1.200
0.200
0.970
0.031
0.000
0.030
0.012 TYP
0.006 TYP
0.114
0.026
0.114
0.185
0.016
0°
0.047
0.008
0.038
A1
A2
b
C
D
3.100
0.122
e
E
3.100
5.100
0.650
6°
0.122
0.201
0.026
6°
E1
L1
θ
REV1.2
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14
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Package Outline Dimensions
SO-14
Dimensions
In Millimeters
Symbol
MIN
1.35
NOM
1.60
0.15
1.45
0.65
MAX
A
1.75
0.25
1.65
0.75
0.49
0.45
0.25
0.25
8.73
6.20
4.00
A1
A2
A3
b
0.10
1.25
0.55
0.36
0.35
0.16
0.15
8.53
5.80
3.80
b1
c
0.40
c1
D
0.20
8.63
E
6.00
E1
e
3.90
1.27 BSC
0.60
L
0.45
0.80
L1
L2
R
1.04 REF
0.25 BSC
0.07
0.07
0.30
0°
R1
h
0.40
0.50
8°
θ
θ1
θ2
θ3
θ4
6°
8°
8°
7°
7°
10°
10°
9°
6°
5°
5°
9°
www.3peakic.com
REV1.2
15
TP1561/TP1561N/TP1562/TP1564
Stable 3.8MHz, 130μA, RRIO, EveryCapTM Op Amps
Package Outline Dimensions
TSSOP-14
Dimensions
Symbol
In Millimeters
MIN
NOM
MAX
A
-
-
-
1.20
0.15
1.05
0.54
0.28
0.24
0.19
0.15
5.06
6.60
4.50
A1
A2
A3
b
0.05
0.90
0.34
0.20
0.20
0.10
0.10
4.86
6.20
4.30
1.00
0.44
-
b1
c
0.22
-
c1
D
0.13
4.96
6.40
4.40
0.65 BSC
0.60
E
E1
e
L
0.45
0.75
L1
L2
R
1.00 REF
0.25 BSC
0.09
0.09
0.20
0°
-
-
-
R1
s
-
-
θ1
θ2
θ3
-
8°
10°
10°
12°
12°
14°
14°
REV1.2
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16
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