Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Multi-purpose SOIC 8

High Precision, Low Noise

OPERATIONAL AMPLIFIERS

FEATURES

● LOW NOISE: 3nV/√Hz

● WIDE BANDWIDTH:

OPA227: 8MHz, 2.3V/µs

OPA228: 33MHz, 10V/

µs

● SETTLING TIME: 5

µs

(significant improvement over OP-27)

● HIGH CMRR: 138dB

● HIGH OPEN-LOOP GAIN: 160dB

● LOW INPUT BIAS CURRENT: 10nA max

● LOW OFFSET VOLTAGE: 75

µV max

● WIDE SUPPLY RANGE: ±2.5V to ±18V

● OPA227 REPLACES OP-27, LT1007, MAX427

● OPA228 REPLACES OP-37, LT1037, MAX437

● SINGLE, DUAL, AND QUAD VERSIONS

APPLICATIONS

● DATA ACQUISITION

● TELECOM EQUIPMENT

● GEOPHYSICAL ANALYSIS

● VIBRATION ANALYSIS

● SPECTRAL ANALYSIS

● PROFESSIONAL AUDIO EQUIPMENT

● ACTIVE FILTERS

● POWER SUPPLY CONTROL

4227

A227

2227

DESCRIPTION

The OPA227 and OPA228 series op amps combine low

noise and wide bandwidth with high precision to make them

the ideal choice for applications requiring both ac and preci-

sion dc performance.

The OPA227 is unity-gain stable and features high slew rate

(2.3V/µs) and wide bandwidth (8MHz). The OPA228 is opti-

mized for closed-loop gains of 5 or greater, and offers higher

speed with a slew rate of 10V/µs and a bandwidth of 33MHz.

The OPA227 and OPA228 series op amps are ideal for

professional audio equipment. In addition, low quiescent

current and low cost make them ideal for portable applica-

tions requiring high precision.

The OPA227 and OPA228 series op amps are pin-for-pin

replacements for the industry standard OP-27 and OP-37

with substantial improvements across the board. The dual

and quad versions are available for space savings and per-

channel cost reduction.

The OPA227, OPA228, OPA2227, and OPA2228 are

available in DIP-8 and SO-8 packages. The OPA4227 and

OPA4228 are available in DIP-14 and SO-14 packages

with standard pin configurations. Operation is specified

from –40°C to +85°C.

SPICE model available for OPA227 at www.ti.com

SBOS110A – MAY 1998 – REVISED JANUARY 2005

www.ti.com

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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.

All trademarks are the property of their respective owners.

OPA227

OPA2227

OPA4227

OPA228

OPA2228

OPA4228

Trim

V+

Output

Trim

–In

+In

V–

OPA227, OPA228

DIP-8, SO-8

NC = Not Connected

V+

Out B

–In B

+In B

Out A

–In A

+In A

V–

OPA2227, OPA2228

DIP-8, SO-8

Out D

–In D

+In D

V–

+In C

–In C

Out C

Out A

–In A

+In A

V+

+In B

–In B

Out B

OPA4227, OPA4228

DIP-14, SO-14

Summary of content (30 pages)

PAGE 1
OPA227 OPA2227 OPA4227 OPA 4 227 OPA 227 OPA 2 227 OPA 42 OPA2 27 OPA228 27 OPA2 227 OPA2228 OPA4228 SBOS110A – MAY 1998 – REVISED JANUARY 2005 High Precision, Low Noise OPERATIONAL AMPLIFIERS FEATURES DESCRIPTION ● LOW NOISE: 3nV/√Hz ● WIDE BANDWIDTH: OPA227: 8MHz, 2.3V/µs OPA228: 33MHz, 10V/µs The OPA227 and OPA228 series op amps combine low noise and wide bandwidth with high precision to make them the ideal choice for applications requiring both ac and precision dc performance.
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SPECIFICATIONS: VS = ±5V to ±15V OPA227 Series At TA = +25°C, and RL = 10kΩ, unless otherwise noted. Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
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SPECIFICATIONS: VS = ±5V to ±15V OPA228 Series At TA = +25°C, and RL = 10kΩ, unless otherwise noted. Boldface limits apply over the specified temperature range, TA = –40°C to +85°C.
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ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage .................................................................................. ±18V Signal Input Terminals, Voltage ........................ (V–) –0.7V to (V+) +0.7V Current ....................................................... 20mA Output Short-Circuit(2) .............................................................. Continuous Operating Temperature .................................................. –55°C to +125°C Storage Temperature .......................
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TYPICAL PERFORMANCE CURVES At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted. OPEN-LOOP GAIN/PHASE vs FREQUENCY OPEN-LOOP GAIN/PHASE vs FREQUENCY G AOL (dB) 120 100 φ 80 –20 160 –40 140 –60 120 –80 100 –100 60 –120 0 OPA228 –20 –40 G –60 –80 φ 80 –100 60 –120 –140 40 –140 40 20 –160 20 –160 0 –180 0 –180 –20 0.01 0.10 1 10 100 1k –20 0.01 0.
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TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, RL =10kΩ, and VS = ±15V, unless otherwise noted. INPUT NOISE VOLTAGE vs TIME CHANNEL SEPARATION vs FREQUENCY 50nV/div Channel Separation (dB) 140 120 100 80 Dual and quad devices. G = 1, all channels. Quad measured Channel A to D, or B to C; other combinations yield similiar or improved rejection. 60 40 10 1s/div 100 1k 10k 100k 1M Frequency (Hz) VOLTAGE NOISE DISTRIBUTION (10Hz) OFFSET VOLTAGE PRODUCTION DISTRIBUTION 24 17.
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TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted. AOL, CMRR, PSRR vs TEMPERATURE AOL, CMRR, PSRR vs TEMPERATURE 160 160 AOL AOL, CMRR, PSRR (dB) AOL, CMRR, PSRR (dB) CMRR 140 130 PSRR 120 110 100 90 80 OPA227 70 60 –75 –50 AOL 150 150 CMRR 140 130 PSRR 120 110 100 90 80 OPA228 70 –25 0 25 50 75 100 60 –75 125 –50 –25 0 Short-Circuit Current (mA) Input Bias Current (nA) 75 100 125 60 1.5 1.0 0.5 0 –0.5 –1.0 –1.
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TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted. SLEW RATE vs TEMPERATURE SLEW RATE vs TEMPERATURE 3.0 12 OPA227 OPA228 10 Positive Slew Rate Negative Slew Rate Slew Rate (µV/V) Slew Rate (µV/V) 2.5 2.0 1.5 1.0 8 6 4 RLOAD = 2kΩ CLOAD = 100pF 0.5 0 0 –75 –50 –25 0 25 50 75 100 125 –75 –50 –25 0 75 CHANGE IN INPUT BIAS CURRENT vs POWER SUPPLY VOLTAGE CHANGE IN INPUT BIAS CURRENT vs COMMON-MODE VOLTAGE 100 125 1.5 1.
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TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted.
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TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted. SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 30 70 VS = ±15V OPA228 OPA228 60 50 20 Overshoot (%) Output Voltage (Vp-p) 25 15 VS = ±5V 10 G = –100 40 30 G = +100 20 G = ±10 5 10 0 0 1k 10k 100k 1M 1 10M 10 Frequency (Hz) 100 1k 10k 100k Load Capacitance (pF) SMALL-SIGNAL STEP RESPONSE G = +10, CL = 1000pF, RL = 1.
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APPLICATIONS INFORMATION Trim range exceeds offset voltage specification V+ The OPA227 and OPA228 series are precision op amps with very low noise. The OPA227 series is unity-gain stable with a slew rate of 2.3V/µs and 8MHz bandwidth. The OPA228 series is optimized for higher-speed applications with gains of 5 or greater, featuring a slew rate of 10V/µs and 33MHz bandwidth. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins.
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INPUT BIAS CURRENT CANCELLATION NOISE PERFORMANCE The input bias current of the OPA227 and OPA228 series is internally compensated with an equal and opposite cancellation current. The resulting input bias current is the difference between with input bias current and the cancellation current. The residual input bias current can be positive or negative.
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Noise in Noninverting Gain Configuration R2 Noise at the output: 2  R  R  2 2 E O 2 = 1 + 2  e n 2 + e12 + e 2 2 + (i n R 2 ) + e S 2 + (i n R S ) 1 + 2  R1  R1    R1 EO RS VS 2  R  Where eS = √4kTRS • 1 + 2  = thermal noise of RS R1   R  e1 = √4kTR1 •  2   R1  = thermal noise of R1 e2 = √4kTR2 = thermal noise of R2 Noise in Inverting Gain Configuration R2 Noise at the output: 2 R1 RS EO VS  R2  2 2 2 2 2 E O 2 = 1 +  e n + e1 + e 2 + (i n R 2 ) + e S R1 + R S 
PAGE 14
R1 2MΩ R2 2MΩ R8 402kΩ R11 178kΩ R3 1kΩ R4 9.09kΩ C4 22nF C6 10nF R6 40.2kΩ C2 1µF C1 1µF U1 C3 0.47µF (OPA227) Input from Device Under Test R7 97.6kΩ R9 178kΩ 2 3 U2 R10 226kΩ 2 6 (OPA227) C5 0.47µF 3 U3 6 VOUT (OPA227) R5 634kΩ FIGURE 6. 0.1Hz to 10Hz Bandpass Filter Used to Test Wideband Noise of the OPA227 and OPA228 Series.
PAGE 15
Without external compensation, the noise specification of the OPA228 is the same as that for the OPA227 in gains of 5 or greater. With the additional external compensation, the output noise of the of the OPA228 will be higher. The amount of noise increase is directly related to the increase in high frequency closed-loop gain established by the CIN/ CF ratio. Figures 8 and 11 show the recommended circuit for gains of +2 and –2, respectively. The figures suggest approximate values for CF.
PAGE 16
1.1kΩ 1.43kΩ 2.2nF dc Gain = 1 330pF 1.1kΩ 1.65kΩ VIN 1.43kΩ 1.91kΩ OPA227 33nF 2.21kΩ OPA227 68nF VOUT 10nF fN = 13.86kHz fN = 20.33kHz Q = 1.186 Q = 4.519 f = 7.2kHz FIGURE 14. Three-Pole, 20kHz Low Pass, 0.5dB Chebyshev Filter. 20pF 0.1µF 100Ω TTL INPUT GAIN “1” “0” +1 –1 100kΩ 9.76kΩ 500Ω 2 3 OPA227 6 Output 10kΩ Input D1 Dexter 1M Thermopile Detector NOTE: Use metal film resistors and plastic film capacitor. Circuit must be well shielded to achieve low noise.
PAGE 17
+15V 0.1µF 1kΩ 1kΩ Audio In 1/2 OPA2227 200Ω To Headphone 200Ω 1/2 OPA2227 This application uses two op amps in parallel for higher output current drive. 0.1µF –15V FIGURE 17. Headphone Amplifier. Bass Tone Control R1 7.5kΩ R2 50kΩ 3 1 CW 2 R3 7.5kΩ R10 100kΩ Midrange Tone Control C1 940pF R4 2.7kΩ VIN R5 50kΩ 3 CW 1 2 R6 2.7kΩ C2 0.0047µF Treble Tone Control R7 7.5kΩ R8 50kΩ 3 CW 1 2 R9 7.5kΩ C3 680pF R11 100kΩ 2 3 OPA227 6 VOUT FIGURE 18.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 19-Sep-2013 PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details.
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PACKAGE MATERIALS INFORMATION www.ti.com 9-Sep-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) W Pin1 (mm) Quadrant OPA2227U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 OPA2227UA/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 OPA2228U/2K5 SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 9-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2227U/2K5 SOIC D 8 2500 367.0 367.0 35.0 OPA2227UA/2K5 SOIC D 8 2500 367.0 367.0 35.0 OPA2228U/2K5 SOIC D 8 2500 367.0 367.0 35.0 OPA2228UA/2K5 SOIC D 8 2500 367.0 367.0 35.0 OPA227U/2K5 SOIC D 8 2500 367.0 367.0 35.0 OPA227UA/2K5 SOIC D 8 2500 367.0 367.0 35.
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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.