TP1512-VR [3PEAK]
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps;型号: | TP1512-VR |
厂家: | 3PEAK |
描述: | Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps |
文件: | 总18页 (文件大小:1508K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Features
Description
TP151x series are CMOS single/dual/quad op-amps
with low offset, stable high frequency response, low
power, low supply voltage, and rail-to-rail inputs and
outputs. They incorporate 3PEAK’s proprietary and
patented design techniques to achieve best in-class
performance among all micro-power CMOS
amplifiers in its power class. The TP151x family can
be used as plug-in replacements for many
Stable 150kHz GBWP Over Temperature Range
Stable 150kHz GBWP in VCM from 0-V to VDD
0.09V/μs Slew Rate
Only 4μA of Supply Current per Amplifier
Shutdown Current: 0.1μA (TP1511N)
Up to 55 Years Operation from 2 AA Alkaline-Cells
Unity Gain Stable for ANY CAPACITIVE Load
Offset Voltage: 3.0mV Maximum
commercially available op-amps to reduce power
and improve input/output range and performance.
TP151x are unity gain stable with Any Capacitive
load with a constant 150kHz GBWP, 0.09V/μs slew
rate while consuming only 4μA of quiescent current
per amplifier. 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. Beyond the rails input and rail-to-rail
output characteristics allow the full power-supply
voltage to be used for signal range.
Offset Voltage Temperature Drift: 0.6 μV/°C
Input Bias Current: 1pA Typical
High CMRR/PSRR: 110dB
No Phase Reversal for Overdriven Inputs
Beyond the Rails Input Common-Mode Range
Outputs Swing to within 5mV of Each Rail
Single +2.1V to +6.0V Supply Voltage Range
–40°C to 125°C Operation Range
This combination of features makes the TP151x
OPA 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. Battery Current Monitor, consumer devices,
handheld instrumentation, Remote battery-powered
sensors, hazard detection (for example, smoke, fire,
and gas), and patient monitors can benefit from the
features of the TP151x op-amps.
ESD Rating:
Robust 8KV – HBM, 2KV – CDM and 500V – MM
Green, Popular Type Package
Applications
Sensor Conditioning
Battery Current Sensing
IR thermometers
For applications that require power-down, the
TP1511N in popular type packages has a low-power
shutdown mode that reduces supply current to less
Digital Scales
than 0.1μA, and forces the output into
a
Automotive Keyless Entry
Toll Booth Tags
high-impedance state.
Data Acquisition Equipment
Battery or Solar Powered Systems
Active Filters, ASIC Input or Output Amplifier
Portable Instruments
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property
of their respective owners.
VDD
R4
R1
R2
LOAD
R3
IN+
IN-
VOUT
TP1511
RSENSE
Figure 1. TP1511 in Battery Monitoring Application
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REV A
1
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Pin Configuration(Top View)
TP1511
5-Pin SOT23/SC70
TP1511N
6-Pin SOT23
TP1512
8-Pin SOIC/MSOP
TP1514
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
﹣Vs
A
A
B
D
C
12
11
﹢In D
﹣Vs
+In
-In
﹢In A
﹣Vs
B
10 ﹢In C
﹢In B
﹣In B
Out B
TP1511
TP1511N
8-Pin MSOP/SOIC
8-Pin MSOP/SOIC
9
8
﹣In C
-V and -S Suffixes
-V and -S Suffixes
Out C
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
Out
NC
﹢Vs
Out
NC
Order Information
Marking
Information
Model Name
Order Number
Package
Transport Media, Quantity
TP1511-TR
TP1511-CR
TP1512-SR
TP1512-VR
TP1514-SR
TP1514-TR
5-Pin SOT23
5-Pin SC70
8-Pin SOIC
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 2500
Tape and Reel, 3000
A1TYW Note1
TP1511
Note1
A1CYW
1512S
1512S
A14S
A14T
TP1512
TP1514
8-Pin MSOP
14-Pin SOIC
14-Pin TSSOP
Note 1: ‘YW’ is date coding scheme. 'Y' stands for calendar year, and 'W' stands for single workweek coding scheme.
Note 1
Absolute Maximum Ratings
Supply Voltage: V+ – V–....................................6.0V
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.................................... ±40mA
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.
REV A
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2
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
ESD, Electrostatic Discharge Protection
Symbol
HBM
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
MM
500
2
V
CDM
Charged Device Model ESD
kV
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 =100pF, VSHDN is unconnected.
SYMBOL PARAMETER
CONDITIONS
VCM = VSUPPLY/2
MIN
-3.0
TYP
± 0.2
0.6
MAX
+3.0
UNITS
mV
VOS
VOS TC
IB
Input Offset Voltage
●
Input Offset Voltage Drift
Input Bias Current
μV/° C
pA
1.0
IOS
Input Offset Current
Input Voltage Noise
1.0
pA
Vn
f = 0.1Hz to 10Hz
3.6
μVP-P
f = 1kHz
f = 10kHz
95
82
en
Input Voltage Noise Density
Input Resistance
nV/√Hz
GΩ
RIN
CIN
>100
Differential
Common Mode
1.5
3.0
Input Capacitance
pF
CMRR
VCM
Common Mode Rejection Ratio
Common-mode Input Voltage Range
Power Supply Rejection Ratio
VCM = 0.1V to 4.9V
●
●
●
●
●
80
V–-0.3
85
110
dB
V
VDD+0.3
PSRR
110
102
102
5
dB
dB
dB
mV
Ω
VOUT = 2.5V, RLOAD= 100kΩ
VOUT = 0.1V to 4.9V, RLOAD= 100kΩ
RLOAD = 100kΩ
80
AVOL
Open-Loop Large Signal Gain
72
VOL, VOH
ROUT
RO
Output Swing from Supply Rail
Closed-Loop Output Impedance
Open-Loop Output Impedance
Output Short-Circuit Current
Supply Voltage
G = 1, f = 1kHz, IOUT = 0
f = 1kHz, 10kHz, IOUT = 0
Sink or source current
30
4
kΩ
mA
V
ISC
40
VDD
2.1
6.0
5.6
IQ
Quiescent Current per Amplifier
Supply Current in Shutdown Note 1
●
4
μA
μA
IQ(off)
0.1
VSHDN = 0.5V
VSHDN = 1.5V
-0.15
-0.15
-20
ISHDN
ILEAK
Shutdown Pin Current Note 1
μA
Output Leakage Current in Shutdown VSHDN = 0V, VOUT = 0V
pA
Note1
VSHDN = 0V, VOUT = 5V
20
VIL
SHDN Input Low Voltage Note 1
SHDN Input High Voltage Note 1
Turn-On Time Note 1
Disable
●
●
0.5
V
V
VIH
tON
tOFF
PM
Enable
1.0
SHDN Toggle from 0V to 5V
SHDN Toggle from 5V to 0V
RLOAD = 100kΩ, CLOAD = 100pF
20
20
67
μs
μs
°
Turn-Off Time Note 1
Phase Margin
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REV A
3
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
-15
MAX
UNITS
dB
GM
Gain Margin
RLOAD = 100kΩ, CLOAD = 100pF
GBWP
Gain-Bandwidth Product
f = 1kHz
150
kHz
Settling Time, 1.5V to 3.5V, Unity
Gain
Settling Time, 2.45V to 2.55V, Unity
Gain
0.1%
0.01%
0.1%
0.01%
22
26
10
12
tS
μs
AV = 1, VOUT = 1.5V to 3.5V, CLOAD
= 100pF, RLOAD = 100kΩ
SR
Slew Rate
0.09
14
V/μs
FPBW
Full Power Bandwidth Note 2
2VP-P
kHz
f=0.1kHz, AV=1, RL=100kΩ, VOUT
=
2VPP
-94
-70
THD+N
Total Harmonic Distortion and Noise
dB
f=1kHz, AV=1, RL=100kΩ, VOUT
=
2VPP
Note 1: Specifications apply to the TP1511N with shutdown.
Note 2: Full power bandwidth is calculated from the slew rate FPBW = SR/π • VP-P.
REV A
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4
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, 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)
110
90
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
Phase
70
50
30
10
Gain
-10
-30
-50
-70
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
1E-12 1E-11 1E-10 1E-09 1E-08 1E-07 1E-06
Load Capacitance (F)
Input Voltage Noise Spectral Density
Common-Mode Rejection Ratio
100k
140
VDD=3.3V
VDD=3.3V
120
100
80
60
40
20
0
10k
1k
100
0.1
1
10 100
FREQUENCY (Hz)
1k
10k
10
100
1k
FREQUENCY (Hz)
10k
100k
1M
10M
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REV A
5
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Typical Performance Characteristics
Over-Shoot Voltage, CLOAD = 40nF, Gain = +1
Over-Shoot % vs. CLOAD, Gain = -1, RFB = 20kΩ
Over-Shoot Voltage, CLOAD=40nF, Gain= -1, RFB=100kΩ
Small-Signal Over-Shoot % vs. CLOAD, Gain = +1
Power-Supply Rejection Ratio
VIN = -0.2V to 5.7V, No Phase Reversal
VDD=3.3V
100
80
60
40
20
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
10M
REV A
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6
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Typical Performance Characteristics
Quiescent Supply Current vs. Temperature
Open-Loop Gain vs. Temperature
5.0
100.0
95.0
90.0
85.0
80.0
75.0
70.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
-40 -20
0
20
40
60
80 100 120
-40 -20
0
20 40 60 80 100 120
Temperature (oC)
Temperature (oC)
Quiescent Supply Current vs. Supply Voltage
Short-Circuit Current vs. Supply Voltage
5.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0.0
2
3
4
Supply Voltage (V)
5
6
2
3
4
Supply Voltage (V)
5
6
Input Offset Voltage Distribution
Closed-Loop Output Impedance vs. Frequency
100k
VDD=3.3V
10k
1k
100
10
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
10M
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REV A
7
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Typical Performance Characteristics
THD+Noise, Gain = +1, VIN = 100Hz, VPP = 2V
THD+Noise, Gain = +1, VIN = 1kHz, VPP = 2V
0.1Hz to 10Hz Time Domain Output Voltage Noise
REV A
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8
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Pin Functions
–IN: Inverting Input of the Amplifier. Voltage range
of this pin can go from V– – 0.3V to V+ + 0.3V.
-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.
+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 TP151x 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 TP151x family of operational amplifiers can operate with power supply voltages from 2.1V to 6.0V. Each
amplifier draws only 4μA 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 TP151x family is optimized for wide bandwidth low power applications. They have an industry
leading high GBW 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 TP151x family provides a low input referred noise of 95nV/√Hz at 1kHz. The noise density will grow slowly
with the frequency in wideband range, and the input voltage noise density is typically 3.6μVP-P at the frequency of
0.1Hz to 10Hz.
Low Input Offset Voltage and Low Offset Voltage Temperature Drift
The TP151x family has a low offset voltage of 3.0mV 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. 3PEAK’s proprietary precision temperature compensation technique makes offset
voltage temperature drift at 0.6μV/°C.
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REV A
9
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Low Input Bias Current
The TP151x 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.
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 1012Ω. A 5V difference would cause 5pA of
current to flow, which is greater than the TP151x 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 2 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.
Guard Ring
VIN+
VIN-
+VS
Figure 2
Ground Sensing and Rail to Rail Output
The TP151x family has excellent output drive capability, delivering over 10mA of output drive current. The output
stage is a rail-to-rail topology that is capable of swinging to within 5mV of either rail. Since the inputs can go
500mV 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 TP151x family has reverse-biased ESD protection diodes on all inputs and output. Input and out pins can
not be biased more than 300mV beyond either supply rail.
Shut-down
The single channel OPA versions have SHDN pins that can shut down the amplifier to less than 0.1μA supply
current. The SHDN pin voltage needs to be within 0.5V 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.
REV A
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TP1511/TP1511N/TP1512/TP1514
4μA, 150KHz, RRIO, True-Ground Sensing Op Amps
Driving Large Capacitive Load
The TP151x 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 TP151x 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.
RISO
VOUT
VIN
CLOAD
Figure 3
Low-Side Current Monitor Application
As shown in Figure 4. Please be noted: 1% resistors provide adequate common-mode rejection at small
ground-loop errors.
3 V
V-REF
+5 V
LOAD
R1
R2
R6
IN-
RSHUNT
1Ω
TP1511
IN+
A/D
R3
R4
R7
FS = 3.0 V
Stray Ground-loop Resistance
Figure 4
High-Side Current Monitor Application
As shown in Figure 5. Please be noted:
(1) Zener rated for op amp supply capability.
(2) Current-limiting resistor.
(3) Choose zener biasing resistor or dual N-MOSMETs.
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REV A
11
TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
RG
Zener(1)
RSHUNT
MOSFET rated
to stand-off
supply voltage
+Vs
IN-
R1(2)
10kΩ
TP1511
IN+
-Vs
+5 V
LOAD
RLOAD
2 zener biasing
RBIAS
methods are
shown.(3)
Figure 5
Window Comparator Application
As shown in Figure 6. Please be noted:
(1) RIN protects A1 and A2 from possible excess current flow.
(2) IN4446 or equivalent diodes, and 2N2222 or equivalent NPN transistor.
(3) The threshold limits are set by VH and VL, with VH > VL. When VIN < VH, the output of A1 is low. When VIN > VL,
the output of A2 is low. Therefore, both op amp outputs are at 0V as long as VIN is between VH and VL. This
architecture results in no current flowing through either diode, Q1 in cutoff, with the base voltage at 0V, and
VOUT forced high.
(4) If VIN falls below VL, the output of A2 is high, current flows through D2, and VOUT is low. Likewise, if VIN rises
above VH, the output of A1 is high, current flows through D1, and VOUT is low.
(5) The window comparator threshold voltages are set as follows:
VS
+Vs
VS
R1
VH
IN-
A1
R7
½
TP1511
IN+
(2)
R2
D1
VOUT
(1)
R5
RIN
(3)
Q1
VIN
+Vs
VS
R6
IN-
A2
R3
R4
½
TP1511
VL
IN+
(2)
D2
VH = [ R2 ÷ (R1 + R2) ] × VS
VL = [ R4 ÷ (R3 + R4) ] × VS
Figure 6
Pulse Oximeter Current Source Application
A pulse oximeter is a noninvasive medical device used for continuously measuring the percentage of Hemoglobin
(Hb) saturated with oxygen and the pulse rate of a patient. Hemoglobin that is carrying oxygen (oxy-hemoglobin)
absorbs light in the infrared (IR) region of the spectrum; hemoglobin that is not carrying oxygen
(deoxy-hemoglobin) absorbs visible red (R) light. In pulse oximetry, a clip containing two LEDs (sometimes more,
depending on the complexity of the measurement algorithm) and the light sensor (photodiode) is placed on the
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TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
finger or earlobe of the patient. One LED emits red light (600 nm to 700 nm) and the other emits light in the near
IR (800 nm to 900 nm) region. The clip is connected by a cable to a processor unit. The LEDs are rapidly and
sequentially excited by two current sources (one for each LED), whose dc levels depend on the LED being driven,
based on manufacturer requirements, and the detector is synchronized to capture the light from each LED as it is
transmitted through the tissue.
An example design of a dc current source driving the red and infrared LEDs is shown in Figure 7. Pulse Oximeter
Red and Infrared Current Sources Using the TP1512 as a Buffer to the Voltage Reference Device.
Figure 7
Portable Gas Meter Application
Figure 8
Four-Pole, Low-pass Butterworth Filter for Glucose Monitor Application
There are several methods of glucose monitoring: spectroscopic absorption of infrared light in the 2 μm to 2.5 μm
range, reflectance spectrophotometry, and the amperometric type using electrochemical strips with glucose
oxidase enzymes. The amperometric type generally uses three electrodes: a reference electrode, a control
electrode, and a working electrode. Although this is a well established and widely used technique, signal-to-noise
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TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
ratio and repeatability can be improved using the TP1511/TP1512/TP1514 amplifiers with their low peak-to-peak
voltage noise of 3.6μV from 0.1 Hz to 10 Hz and voltage noise density of 95nV/√Hz at 1 kHz.
Another consideration is operation from a 3.3 V battery. Glucose signal currents are usually less than 3μA full
scale; therefore, the I-to-V converter requires low input bias current. The TP1511/TP1512/TP1514 are excellent
choices because these amplifiers provide 1pA typical and 10pA maximum of input bias current at ambient
temperature.
A low-pass filter with a cutoff frequency of 80Hz to 100Hz is desirable in a glucose meter device to remove
extraneous noise; this can be a simple two-pole or four-pole Butterworth filter. Low power op amps with
bandwidths of 50kHz to 500kHz should be adequate. The TP1511/TP1512/TP1514 amplifiers with their 150kHz
GBWP and 4μA typical current consumption meet these requirements. A circuit design of a four-pole Butterworth
filter (preceded by a one-pole, low-pass filter) is shown in Figure 9. With a 3.3 V battery, the total power
consumption of this design is 80μW typical at ambient temperature.
Figure 9
Two Op Amp Instrumentation Amplifier
The TP151x OPA series is well suited for conditioning sensor signals in battery-powered applications. Figure 10
shows a two op-amp instrumentation amplifier, using the TP151x 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.
Figure 10
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TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Package Outline Dimensions
SC70-5 /SOT-353
Dimensions
In Millimeters In Inches
Min Max Min Max
Dimensions
Symbol
A
0.900 1.100 0.035 0.043
0.000 0.100 0.000 0.004
0.900 1.000 0.035 0.039
0.150 0.350 0.006 0.014
0.080 0.150 0.003 0.006
2.000 2.200 0.079 0.087
1.150 1.350 0.045 0.053
2.150 2.450 0.085 0.096
A1
A2
b
C
D
E
E1
e
0.650TYP
1.200 1.400 0.047 0.055
0.525REF 0.021REF
0.260 0.460 0.010 0.018
0° 8° 0° 8°
0.026TYP
e1
L
L1
θ
SOT23-5
Dimensions
Symbol In Millimeters In Inches
Min Max Min Max
Dimensions
A
1.050 1.250 0.041 0.049
0.000 0.100 0.000 0.004
1.050 1.150 0.041 0.045
0.300 0.400 0.012 0.016
0.100 0.200 0.004 0.008
2.820 3.020 0.111 0.119
1.500 1.700 0.059 0.067
2.650 2.950 0.104 0.116
A1
A2
b
C
D
E
E1
e
0.950TYP
1.800 2.000 0.071 0.079
0.700REF 0.028REF
0.300 0.460 0.012 0.024
0.037TYP
e1
L
L1
θ
0°
8°
0°
8°
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TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Package Outline Dimensions
SOIC-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
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TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, EveryCapTM Op Amps
Package Outline Dimensions
SOIC-14
Dimensions
In Millimeters
Symbol
MIN
NOM
1.60
0.15
1.45
0.65
MAX
A
1.35
0.10
1.25
0.55
0.36
0.35
0.16
0.15
8.53
5.80
3.80
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
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°
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TP1511/TP1511N/TP1512/TP1514
Stable 150kHz, 4μA, Rail-to-Rail, 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
-
-
-
R1
s
0.09
-
0.20
-
θ1
θ2
θ3
0°
-
8°
10°
12°
12°
14°
14°
10°
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