TP1561-SR [3PEAK]

Stable 3.8MHz, 130Î¼A, RRIO, EveryCapTM Op Amps;


型号：	TP1561-SR
厂家：	3PEAK
描述：	Stable 3.8MHz, 130Î¼A, 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, EveryCap^TMOp 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 V_CMfrom 0-V to V_DD

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 2V_PPsignal 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

13 ﹣In D

Out A

﹣In A

﹢In A

﹢Vs

Out D

﹢Vs

SHDN

-In

Out

﹣Vs

+In

Out A

﹢Vs

﹣In A

Out B

﹣In B

﹢In B

﹣Vs

﹢In D

﹣Vs

+In

-In

﹢In A

﹣Vs

10 ﹢In C

﹢In B

﹣In B

Out B

TP1561

TP1561N

8-Pin MSOP/SOIC

﹣In C

TP1561U

5-Pin SOT23

-V and -S Suffixes

Out C

-T Suffix

﹣In

﹢In

﹣Vs

﹣In

﹢In

﹣Vs

SHDN

﹣Vs

﹢Vs

Out

﹢Vs

Out

+In

-In

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REV1.2

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp 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

Parameter

Human Body Model ESD

Machine Model ESD

Condition

Minimum Level

Unit

MIL-STD-883H Method 3015.8

JEDEC-EIA/JESD22-A115

JEDEC-EIA/JESD22-C101E

500

CDM

Charged Device Model ESD

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, 4000

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

www.3peakic.com

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

5V Electrical Characteristics

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T_A= 27°C.

_SUPPLY= 5V, V_CM= V_OUT= V_SUPPLY/2, R_L= 100KΩ, C_L=100pF, V_SHDNis unconnected.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V_OS

Input Offset Voltage

V_CM= V_DD/2

●

-3.0

±0.1

+3.0

V_OSTC

I_B

Input Offset Voltage Drift

Input Bias Current

0.6

1.0

μV/°C

I_OS

V_n

Input Offset Current

Input Voltage Noise

1.0

2.4

> 100

2.0

3.5

μV_P-P

f = 0.1Hz to 10Hz

f = 1kHz

f = 10kHz

e_n

Input Voltage Noise Density

Input Resistance

nV/√Hz

GΩ

R_IN

Differential

Common Mode

V_CM= 0.1V to 4.9V

C_IN

Input Capacitance

CMRR

V_CM

Common Mode Rejection Ratio

Common-mode Input Voltage

Range

●

120

V^––0.3

V⁺+0.3

PSRR

A_VOL

Power Supply Rejection Ratio

●

120

110

102

0.4

2.6

Ω

_OUT= 2.5V, R_LOAD= 100kΩ

Open-Loop Large Signal Gain

V_OUT= 0.1V to 4.9V, R_LOAD= 100kΩ

R_LOAD= 100kΩ

G = 1, f = 1kHz, I_OUT= 0

f = 100kHz, I_OUT= 0

V_OL, V_OH

R_OUT

R_O

I_SC

V_DD

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

I_Q

I_Q(off)

Quiescent Current per Amplifier

Supply Current in Shutdown ^{Note 1}

●

130

0.2

-0.15

-20

μA

V_SHDN= 0.5V

I_SHDN

I_LEAK

Shutdown Pin Current ^{Note 1}

μA

_SHDN= 1.5V

V_SHDN= 0V, V_OUT= 0V

_SHDN= 0V, V_OUT= 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

V_IL

V_IH

t_ON

t_OFF

GBWP

Disable

Enable

●

0.5

μs

SHDN Toggle from 0V to 5V

SHDN Toggle from 5V to 0V

R_LOAD= 100kΩ, C_LOAD= 100pF

f = 1kHz

-15

3.8

0.7

0.8

0.1

0.2

MHz

0.01%

0.1%

0.01%

t_S

μs

A_V= 1, V_OUT= 1.5V to 3.5V, C_LOAD

100pF, R_LOAD= 100kΩ

2V_P-P

f=1kHz, A_V=1, R_L=100kΩ, V_OUT= 2V_PP

f=10kHz, A_V=1, R_L=100kΩ, V_OUT= 2V_PP

Slew Rate

3.6

V/μs

kHz

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 • V_P-P.

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REV1.2

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

Typical Performance Characteristics

Small-Signal Step Response, 100mV Step

Large-Signal Step Response, 2V Step

Open-Loop Gain and Phase

Phase Margin vs. C_LOAD(Stable for Any C_LOAD)

Input Voltage Noise Spectral Density

Common-Mode Rejection Ratio

REV1.2

www.3peakic.com

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

Typical Performance Characteristics

Over-Shoot Voltage, C_LOAD= 40nF, Gain = +1

Over-Shoot % vs. C_LOAD, Gain = -1, R_FB= 20kΩ

Small-Signal Over-Shoot % vs. C_LOAD, Gain = +1

V_IN= -0.2V to 5.7V, No Phase Reversal

Over-Shoot Voltage, C_LOAD=40nF, Gain= -1, R_FB=100kΩ

Power-Supply Rejection Ratio

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REV1.2

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp 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

www.3peakic.com

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

Pin Functions

–IN: Inverting Input of the Amplifier. Voltage range

-V_S: 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.

+V_S: 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 μV_P-Pat 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

TP1561/ TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp 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 10¹²Ω. 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 (V_IN+) to the input with a wire that does not touch the PCB surface.

b) Connect the guard ring to the inverting input pin (V_IN–). 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 (V_IN+). This biases the guard ring to the same reference voltage as

the op-amp (e.g., V_DD/2 or ground).

b) Connect the inverting pin (V_IN–) 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

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp 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 (R_ISOin 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 (V_DDfor 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

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp 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 (V_REF) is supplied by a low-impedance source. In single voltage supply applications, V_REFis typically

V_DD/2.

¹) V_REF

R₂R_G

V_OUT=(V V₂)(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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TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp 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

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp 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-V_OS,

low input bias current, high CMRR, and high PSRR are other factors which make these amplifiers excellent

choices for this application.

10MOhm

100KOhm

Vout

Oxygen Sensor

City Technology

4OX2

100KOhm

V_OUT1Vin Air ( 21% O₂)

I_DD 0.7uA

100Ohm

O₂

Figure 9

REV1.2

www.3peakic.com

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

Package Outline Dimensions

SC70-5 /SOT-353

Dimensions

Dimensions In

Inches

In Millimeters

Symbol

Min

Max

Min

Max

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

1.400

0.055

0.460

8°

0.018

8°

SOT23-5 (SOT23-6)

Dimensions

Dimensions In

Inches

Symbol

In Millimeters

Min

Max

Min

Max

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

2.000

0.079

0.460

8°

0.024

8°

www.3peakic.com

REV1.2

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

Package Outline Dimensions

SO-8

Dimensions

Dimensions In

Inches

In Millimeters

Symbol

Min

Max

Min

Max

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

1.270

8°

0.050

8°

MSOP-8

Dimensions

Dimensions In

Inches

In Millimeters

Symbol

Min

Max

Min

Max

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

3.100

0.122

3.100

5.100

0.650

6°

0.122

0.201

0.026

6°

REV1.2

www.3peakic.com

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

Package Outline Dimensions

SO-14

Dimensions

In Millimeters

Symbol

MIN

1.35

NOM

1.60

0.15

1.45

0.65

MAX

1.75

0.25

1.65

0.75

0.49

0.45

0.25

8.73

6.20

4.00

0.10

1.25

0.55

0.36

0.35

0.16

0.15

8.53

5.80

3.80

0.40

0.20

8.63

6.00

3.90

1.27 BSC

0.60

0.45

0.80

1.04 REF

0.25 BSC

0.07

0.30

0°

0.40

0.50

8°

θ1

θ2

θ3

θ4

6°

8°

7°

10°

9°

6°

5°

9°

www.3peakic.com

REV1.2

TP1561/TP1561N/TP1562/TP1564

Stable 3.8MHz, 130μA, RRIO, EveryCap^TMOp Amps

Package Outline Dimensions

TSSOP-14

Dimensions

Symbol

In Millimeters

MIN

NOM

MAX

1.20

0.15

1.05

0.54

0.28

0.24

0.19

0.15

5.06

6.60

4.50

0.05

0.90

0.34

0.20

0.10

4.86

6.20

4.30

1.00

0.44

0.22

0.13

4.96

6.40

4.40

0.65 BSC

0.60

0.45

0.75

1.00 REF

0.25 BSC

0.09

0.20

0°

θ1

θ2

θ3

8°

10°

12°

14°

REV1.2

www.3peakic.com

TP1561-SR [3PEAK]

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