Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - In-amp InAmp VSSOP 8

50 kW10 kW

-IN

+IN

V+

V-

Device

G = 5 +

80 kW

8 kW

Load

V = G (V´ V )-

O IN+ IN-

0.1 Fm

REF

INA827

www.ti.com

SBOS631A –JUNE 2012–REVISED JULY 2013

Wide Supply Range, Rail-to-Rail Output

Instrumentation Amplifier with a Minimum Gain of 5

Check for Samples: INA827

FEATURES

DESCRIPTION

The INA827 is a low-cost instrumentation amplifier

• Eliminates Errors from External Resistors at

(INA) that offers extremely low power consumption

Gain of 5

and operates over a very wide single- or dual-supply

• Common-Mode Range Goes Below

range. The device is optimized for the lowest possible

Negative Supply

gain drift of only 1 ppm per degree Celsius in G = 5,

which requires no external resistor. However, a single

• Input Protection: Up to ±40 V

external resistor sets any gain from 5 to 1000.

• Rail-to-Rail Output

The INA827 is optimized to provide excellent

• Outstanding Precision:

common-mode rejection ratio (CMRR) of over 88 dB

– Common-Mode Rejection: 88 dB, min

(G = 5) over frequencies up to 5 kHz. In G = 5,

– Low Offset Voltage: 150 µV, max

CMRR exceeds 88 dB across the full input common-

mode range from the negative supply all the way up

– Low Drift: 2.5 µV/°C, max

to 1 V of the positive supply. Using a rail-to-rail

– Low Gain Drift: 1 ppm/°C, max (G = 5 V/V)

output, the INA827 is well-suited for low-voltage

– Power-Supply Rejection:

operation from a 2.7 V single-supply as well as dual

100 dB, min (G = 5)

supplies up to ±18 V. Additional circuitry protects the

inputs against overvoltage of up to ±40 V beyond the

– Noise: 17 nV/√Hz, G = 1000 V/V

power supplies by limiting the input currents to a save

• High Bandwidth:

level.

– G = 5: 600 kHz

The INA827 is available in a small MSOP-8 package

– G = 100: 150 kHz

and is specified for the –40°C to +125°C temperature

• Supply Current: 200 µA, typ

range. For a similar instrumentation amplifier with a

gain range of 1 V/V to 1000 V/V, see the INA826.

• Supply Range:

– Single Supply: +2.7 V to +36 V

– Dual Supply: ±1.35 V to ±18 V

• Specified Temperature Range:

–40°C to +125°C

• Package: MSOP-8

APPLICATIONS

• Industrial Process Controls

• Multichannel Systems

• Power Automation

• Weigh Scales

• Medical Instrumentation

• Data Acquisition

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.

2PhotoMOS is a registered trademark of Panasonic Electric Works Europe AG.

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 (30 pages)

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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier with a Minimum Gain of 5 Check for Samples: INA827 FEATURES DESCRIPTION • The INA827 is a low-cost instrumentation amplifier (INA) that offers extremely low power consumption and operates over a very wide single- or dual-supply range. The device is optimized for the lowest possible gain drift of only 1 ppm per degree Celsius in G = 5, which requires no external resistor.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 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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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 ELECTRICAL CHARACTERISTICS At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. INA827 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT RTI, VOS = VOSI + (VOSO / G) 40 150 µV TA = –40°C to +125°C 0.5 2.5 µV/°C RTI, VOS = VOSI + (VOSO / G) 500 2000 5 30 INPUT VOSI Input stage Offset voltage (1) VOSO PSRR ZIN Output stage Power-supply rejection ratio Impedance TA = –40°C to +125°C G = 5, VS = ±1.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. INA827 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT GAIN 80 kW G Gain equation G Range of gain GE 5+ V/V RG 5 G = 5, VO = ±10 V Gain error Gain versus temperature (4) Gain nonlinearity 1000 V/V ±0.005 ±0.035 G = 10 to 1000, VO = ±10 V ±0.1 ±0.4 G = 5, TA = –40°C to +125°C ±0.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 THERMAL INFORMATION INA827 THERMAL METRIC (1) DGK (MSOP) UNITS 8 PINS θJA Junction-to-ambient thermal resistance 215.4 θJCtop Junction-to-case (top) thermal resistance 66.3 θJB Junction-to-board thermal resistance 97.8 ψJT Junction-to-top characterization parameter 10.5 ψJB Junction-to-board characterization parameter 96.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. TYPICAL DISTRIBUTION OF INPUT OFFSET VOLTAGE 250 TYPICAL DISTRIBUTION OF INPUT OFFSET VOLTAGE DRIFT 30 SD: 40.1 µV MEAN: −7.6 µV SD: 0.51 µV/°C MEAN: 0.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. INPUT COMMON-MODE VOLTAGE vs OUTPUT VOLTAGE (Single Supply, VS = +2.7 V, G = 5) INPUT COMMON-MODE VOLTAGE vs OUTPUT VOLTAGE (Single Supply, VS = +2.7 V, G = 100) 1.5 1 Vref = 0V Vref = 1.35V 0.5 0 −0.5 −0.5 0 0.5 1 1.5 Output Voltage (V) 2 Common−Mode Voltage (V) Common−Mode Voltage (V) 2 2 2.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. 12 6 12 8 4 8 2 4 0 0 Vs = +/− 12V Vs = +/− 15V 4 0 −4 −4 −2 IIN VOUT −4 −8 −8 −12 −6 −16 −16 −8 −30 −12 −8 −4 0 4 Output Voltage (V) 8 12 −20 16 −10 0 10 Input Voltage (V) −16 G014 Figure 13. Figure 14.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. INPUT BIAS CURRENT vs COMMON-MODE VOLTAGE (VS = +2.7 V) −45°C 25°C 85°C 125°C 120 100 100 80 60 40 20 0 −45°C 25°C 85°C 125°C 90 Input Bias Current (nA) Input Bias Current (nA) 140 INPUT BIAS CURRENT vs COMMON-MODE VOLTAGE (VS = ±15 V) 80 70 60 50 40 30 20 10 −0.5 0.0 0.5 1.0 1.5 Common−Mode Voltage (V) 2.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. GAIN NONLINEARITY (G = 10) 10 8 8 6 6 Non−Linearity (ppm) Non−Linearity (ppm) GAIN NONLINEARITY (G = 5) 10 4 2 0 −2 −4 4 2 0 −2 −4 −6 −6 −8 −8 −10 −10 −8 −6 −4 −2 0 2 4 Output Voltage (V) 6 8 −10 −10 10 −8 −6 −4 G035 Figure 31.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. OFFSET VOLTAGE vs NEGATIVE COMMON-MODE VOLTAGE (VS = +2.7 V) VS = +2.7 V 400 200 0 −100 −200 200 100 0 −100 −200 −300 −300 −400 −400 15 1 1.5 Common−Mode Voltage (V) −500 −0.5 2 −0.3 −0.2 −0.1 0 0.1 Common−Mode Voltage (V) 0.2 Figure 38.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. SMALL-SIGNAL RESPONSE OVER CAPACITIVE LOADS (G = 5) SMALL-SIGNAL RESPONSE (G = 5, RL = 1 kΩ, CL = 100 pF) Output Voltage (10 mV/div) Output Voltage (V) 0.2 0.1 CL = 0 pF CL = 100 pF CL = 220 pF CL = 500 pF CL = 1 nF CL = 220 nF 0 −0.1 −0.2 Time (5 ms/div) Time (5 ms/div) G045 Figure 44.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = ±15 V, RL = 10 kΩ, VREF = 0 V, and G = 5, unless otherwise noted. LARGE-SIGNAL RESPONSE AND SETTLING TIME (G = 10, RL = 10 kΩ, CL = 100 pF) Output Voltage (5 V/div) Output Voltage (5 V/div) Time (50 ms/div) Output Settling (0.002%/div) Output Voltage Output Settling Output Settling (0.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 APPLICATION INFORMATION Figure 54 shows the basic connections required for device operation. Good layout practice mandates that bypass capacitors are placed as close to the device pins as possible. The INA827 output is referred to the output reference (REF) terminal, which is normally grounded. This connection must be low-impedance to assure good common-mode rejection.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com SETTING THE GAIN Device gain is set by a single external resistor (RG), connected between pins 2 and 3. The value of RG is selected according to Equation 1: 80 kW 5+ RG (1) Table 1 lists several commonly-used gains and resistor values. The on-chip resistors are laser-trimmed to accurate absolute values. The accuracy and temperature coefficients of these resistors are included in the gain accuracy and drift specifications of the INA827. Table 1.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 OFFSET TRIMMING Most applications require no external offset adjustment; however, if necessary, adjustments can be made by applying a voltage to the REF terminal. Figure 55 shows an optional circuit for trimming the output offset voltage. The voltage applied to the REF terminal is summed at the output. The op amp buffer provides low impedance at the REF terminal to preserve good common-mode rejection.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com INSIDE THE INA827 Refer to Figure 54 for a simplified representation of the INA827. A more detailed diagram (shown in Figure 56) provides additional insight into the INA827 operation. Each input is protected by two field-effect transistors (FETs) that provide a low series resistance under normal signal conditions and preserve excellent noise performance.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 INPUT BIAS CURRENT RETURN PATH The INA827 input impedance is extremely high—approximately 20 GΩ. However, a path must be provided for the input bias current of both inputs. This input bias current is typically 35 nA. High input impedance means that this input bias current changes very little with varying input voltage. Input circuitry must provide a path for this input bias current for proper operation.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com REFERENCE TERMINAL The INA827 output voltage is developed with respect to the voltage on the reference terminal. Often, in dualsupply operation, the reference pin (pin 6) is connected to the low-impedance system ground. Offsetting the output signal to a precise mid-supply level (for example, 2.5 V in a 5-V supply environment) can be useful in single-supply operation.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 OPERATING VOLTAGE The INA827 operates over a power-supply range of +2.7 V to +36 V (±1.35 V to ±18 V). Supply voltages higher than 40 V (±20 V) can permanently damage the device. Parameters that vary over supply voltage or temperature are shown in the Typical Characteristics section. Low-Voltage Operation The INA827 can operate on power supplies as low as ±1.35 V.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com Resistor-adjustable INAs such as the INA827 yield the lowest gain error at G = 5 because of the inherently wellmatched drift of the internal resistors of the differential amplifier. At gains greater than 5 (for instance, G = 10 V/V or G = 100 V/V) gain error becomes a significant error source because of the resistor drift contribution of the feedback resistors in conjunction with the external gain resistor.
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INA827 www.ti.com SBOS631A – JUNE 2012 – REVISED JULY 2013 APPLICATION EXAMPLE Programmable Logic Controller (PLC) Input An example programmable logic controller (PLC) input application using an INA827 is shown in Figure 60. ±10 V 100 kW +15 V 4.87 kW 4 mA to 20 mA ±20 mA 12.4 kW VOUT = 2.5 V ± 2.3 V Device 20 W REF -15 V +2.5 V REF3225 +5 V Figure 60.
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INA827 SBOS631A – JUNE 2012 – REVISED JULY 2013 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Original (June 2012) to Revision A Page • Changed front-page graphic ................................................................................................................................................. 1 • Updated Figure 15 ....................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Jun-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device INA827AIDGKR Package Package Pins Type Drawing VSSOP DGK 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 5.3 B0 (mm) K0 (mm) P1 (mm) 3.4 1.4 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Jun-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA827AIDGKR VSSOP DGK 8 2500 366.0 364.0 50.
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