Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Zero drift SOT 23 5

100nV/div

Time(1s/div)Time(1s/div)

0.1HzTO10HzNOISE

Frequency(Hz)

NOISESPECTRALDENSITYvsFREQUENCY

VoltageNoiseDensity(nV/ )Ö

CurrentNoise(fA/ )Ö

Frequency(Hz)

10 100 1k 10k

100

CurrentNoise

VoltageNoise

ContinueswithNo1/f(flicker)Noise

OPA378

OPA2378

www.ti.com

SBOS417D –JANUARY 2008–REVISED OCTOBER 2009

Low-Noise, 900kHz, RRIO,

Precision OPERATIONAL AMPLIFIER

Zerø-Drift Series

Check for Samples: OPA378 OPA2378

FEATURES

DESCRIPTION

• LOW NOISE

The OPA378 and OPA2378 represent a new

generation of Zerø-Drift, microPOWER™ operational

– 0.4μV

, 0.1Hz to 10Hz

amplifiers that use a proprietary auto-calibration

– 20nV/√Hz at 1kHz

technique to provide minimal input offset voltage

• ZERØ-DRIFT SERIES

(20μV) and offset voltage drift (0.1μV/°C). The

– LOW OFFSET VOLTAGE: 20μV combination of low input voltage noise, high gain

bandwidth (900kHz), and low power (150μA max)

– LOW OFFSET DRIFT: 0.1μV/°C

enable these devices to achieve optimum

• QUIESCENT CURRENT: 125μA

performance for low-power precision applications. In

• GAIN BANDWIDTH: 900kHz

addition, the excellent PSRR performance, coupled

with a wide input supply range of 2.2V to 5.5V and

• RAIL-TO-RAIL INPUT/OUTPUT

rail-to-rail input and output, makes it an outstanding

• EMI FILTERING

choice for single-supply applications that run directly

• SUPPLY VOLTAGE: 2.2V to 5.5V

from batteries without regulation.

• microSIZE PACKAGES: SC70 and SOT23

The OPA378 (single version) is available in both a

microSIZE SC70-5 and a SOT23-5 package. The

APPLICATIONS

OPA2378 (dual version) is offered in a SOT23-8

package. All versions are specified for operation from

• PORTABLE MEDICAL DEVICES

–40°C to +125°C.

– GLUCOSE METERS

– OXYGEN METERING

– HEART RATE MONITORS

• WEIGH SCALES

• BATTERY-POWERED INSTRUMENTS

• THERMOPILE MODULES

• HANDHELD TEST EQUIPMENT

• SENSOR SIGNAL CONDITIONING

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2microPOWER is a trademark of Texas Instruments Incorporated.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (29 pages)

PAGE 1
OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 Low-Noise, 900kHz, RRIO, Precision OPERATIONAL AMPLIFIER Zerø-Drift Series Check for Samples: OPA378 OPA2378 FEATURES DESCRIPTION • The OPA378 and OPA2378 represent a new generation of Zerø-Drift, microPOWER™ operational amplifiers that use a proprietary auto-calibration technique to provide minimal input offset voltage (20μV) and offset voltage drift (0.1μV/°C).
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 ELECTRICAL CHARACTERISTICS: VS = +2.2V to +5.5V Boldface limits apply over the specified temperature range, TA = –40°C to +125°C. At TA = +25°C, RL = 10kΩ connected to VS/2, VCM = VS/2, and VOUT = VS/2, unless otherwise noted. OPA378, OPA2378 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 20 50 μV 0.1 0.25 μV/°C 20 70 µV -40°C to +125°C 0.25 0.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS: VS = +2.2V to +5.5V (continued) Boldface limits apply over the specified temperature range, TA = –40°C to +125°C. At TA = +25°C, RL = 10kΩ connected to VS/2, VCM = VS/2, and VOUT = VS/2, unless otherwise noted. OPA378, OPA2378 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT RL = 10kΩ 6 8 mV RL = 10kΩ 8 13 mV RL = 10kΩ 6 10 mV RL = 10kΩ 8 15 mV RL = 100kΩ 0.
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OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 TYPICAL CHARACTERISTICS At TA = +25°C, RL = 10kΩ, VS = +5.5V and VOUT = VS/2, unless otherwise noted. INPUT CURRENT AND VOLTAGE NOISE SPECTRAL DENSITY vs FREQUENCY 0.1Hz TO 10Hz NOISE 1k 100nV/div Voltage Noise Density (nV/ÖHz) Current Noise (fA/ÖHz) Continues with No 1/f (flicker) Noise Current Noise 100 Voltage Noise 10 1 Time (1s/div) 1 10 100 1k 10k Frequency (Hz) Figure 1. Figure 2.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, RL = 10kΩ, VS = +5.5V and VOUT = VS/2, unless otherwise noted. POWER-SUPPLY REJECTION RATIO vs FREQUENCY OFFSET VOLTAGE vs TEMPERATURE 80 120 60 100 Offset Voltage (mV) 40 +PSRR 80 PSRR (dB) 20 0 -20 60 -PSRR 40 -40 20 -60 -80 0 -75 -50 -25 25 0 75 50 100 125 150 10 1 100 Temperature (°C) Figure 5. Figure 6.
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OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, RL = 10kΩ, VS = +5.5V and VOUT = VS/2, unless otherwise noted. INPUT BIAS CURRENT vs INPUT COMMON-MODE VOLTAGE INPUT BIAS CURRENT vs TEMPERATURE 2000 400 1500 -IB 200 Input Bias Current (pA) Input Bias Current (pA) 300 100 0 -100 -200 +IB 500 0 -500 -1000 -1500 -300 -400 -0.5 0 1000 -2000 -75 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -50 -25 0 75 Figure 12.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, RL = 10kΩ, VS = +5.5V and VOUT = VS/2, unless otherwise noted. TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE 1 60 50 40 Overshoot (%) THD+N (%) 0.1 0.01 30 Gain = +1V/V, -1V/V R = 10kW 20 0.001 Gain = -1V/V R = 5kW 10 0.0001 0 10 100 10k 1k 1 10 Frequency (Hz) 100 1k Load Capacitance (pF) Figure 17. Figure 18.
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OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, RL = 10kΩ, VS = +5.5V and VOUT = VS/2, unless otherwise noted.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com APPLICATIONS INFORMATION OPERATING VOLTAGE The OPA378 and OPA2378 can be used with single or dual supplies from an operating range of VS = +2.2V (±1.1V) and up to VS = +5.5V (±2.75V). This device does not require symmetrical supplies, only a differential supply voltage of 2.2V to 5.5V. A power-supply rejection ratio of 1.5μV/V (typical) ensures that the device functions with an unregulated battery source.
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OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 The typical input bias current of the OPA378 during normal operation is approximately 150pA. In over-driven conditions, the bias current can increase significantly (see Figure 24). The most common cause of an over-driven condition occurs when the op amp is outside of the linear range of operation.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com ELECTRICAL OVERSTRESS Designers often ask questions about the capability of an operational amplifier to withstand electrical overstress. These questions tend to focus on the device inputs, but may involve the supply voltage pins or even the output pin.
PAGE 13
OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 An ESD event produces a short duration, high-voltage pulse that is transformed into a short duration, high-current pulse as it discharges through a semiconductor device. The ESD protection circuits are designed to provide a current path around the operational amplifier core to prevent it from being damaged. The energy absorbed by the protection circuitry is then dissipated as heat.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com REF3330 +5V 3V Load R1 4.99kW R2 49.9kW ILOAD R6 71.5kW RS 600W V RSHUNT 1W OPA378 C1 1.2nF R4 48.7kW R3 4.99kW ADS1100 R7 1.18kW Stray Ground-Loop Resistance RN 56W RN 56W 2 IC (PGA Gain = 4) FS = 3.0V NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors. Figure 32.
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OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 REF3333 +5V 0.1mF 3.3V + R1 6.04kW D1 - R2 2.94kW - + + R8 150kW R5 31.6kW +5V 10mF 0.1mF R7 549W R4 6.04kW R3 60.4W VO OPA378 R6 200W K-Type Thermocouple 40.7mV/°C Zero Adj. Figure 34. Temperature Measurement 1MW 60kW 100kW V1 -In INA152 OPA378 3V 1MW NTC Thermistor R2 OPA378 R1 2 5 6 R2 3 Figure 35. Thermistor Measurement VO 1 OPA378 V2 +In VO = (1 + 2R2/R1) (V2 - V1) Figure 36.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com +VS R1 100kW fLPF = 150Hz C4 1.06nF 1/2 OPA2378 RA +VS R2 100kW R6 100kW 1/2 OPA2378 +VS 3 2 LL 7 INA321 (1) 4 5 R8 100kW +VS dc R3 100kW 1/2 OPA2378 Wilson LA R14 1MW GTOT = 1kV/V R7 100kW ac GINA = 5 R12 5kW 6 +VS 1 C3 1mF VOUT OPA378 R13 318kW GOPA = 200 +VS 1/2 OPA2378 VCENTRAL C1 47pF (RA + LA + LL)/3 fHPF = 0.
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OPA378 OPA2378 www.ti.com SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 C7 110pF C4 600pF Digital Stethoscope Microphone Output R5 100kW R3 100kW C2 10mF Electret Microphone Element with Internal FET +5V R2 10kW Out OPA378 C6 470nF C3 1 mF 2.2kW Mic Bias Mic Output +5V R4 10kW OPA378 C1 33pF Gnd C5 10mF VBIAS1 VBIAS2 Figure 38.
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OPA378 OPA2378 SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision C (June 2009) to Revision D Page • Changed OPA2378 orderable status to production data; updated references throughout document ................................. 1 • Changed first sentence of Description section .......................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 2-Nov-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) OPA2378AIDCNR SOT-23 DCN 8 3000 179.0 8.4 OPA2378AIDCNT SOT-23 DCN 8 250 179.0 OPA378AIDBVR SOT-23 DBV 5 3000 179.0 OPA378AIDBVT SOT-23 DBV 5 250 OPA378AIDCKR SC70 DCK 5 OPA378AIDCKR SC70 DCK OPA378AIDCKT SC70 DCK OPA378AIDCKT SC70 DCK 3.2 3.
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PACKAGE MATERIALS INFORMATION www.ti.com 2-Nov-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2378AIDCNR SOT-23 DCN 8 3000 195.0 200.0 45.0 OPA2378AIDCNT SOT-23 DCN 8 250 195.0 200.0 45.0 OPA378AIDBVR SOT-23 DBV 5 3000 195.0 200.0 45.0 OPA378AIDBVT SOT-23 DBV 5 250 195.0 200.0 45.0 OPA378AIDCKR SC70 DCK 5 3000 180.0 180.0 18.0 OPA378AIDCKR SC70 DCK 5 3000 195.0 200.0 45.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.