OPA2333-Q1 www.ti.com SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 1.8-V MICROPOWER CMOS OPERATIONAL AMPLIFIER ZERO-DRIFT SERIES Check for Samples: OPA2333-Q1 FEATURES 1 • • • • • • • D OR DGK PACKAGE (TOP VIEW) Qualified for Automotive Applications Low Offset Voltage: 23 mV (Max) 0.01-Hz to 10-Hz Noise: 1.1 mVPP Quiescent Current: 17 mA Single-Supply Operation Supply Voltage: 1.8 V to 5.5 V Rail-to-Rail Input/Output OUT A –IN A +IN A V– 1 2 3 4 8 7 6 5 V+ OUT B –IN B +IN B 0.1Hz TO 10Hz NOISE APPLICATIONS Transducer Applications Temperature Measurements Electronic Scales Medical Instrumentation Battery-Powered Instruments Handheld Test Equipment 500nV/div • • • • • • 1s/div DESCRIPTION/ORDERING INFORMATION The OPA2333A CMOS operational amplifiers use a proprietary auto-calibration technique to simultaneously provide very low offset voltage (10 mV max) and near-zero drift over time and temperature. These miniature high-precision low-quiescent-current amplifiers offer high-impedance inputs that have a common-mode range 100 mV beyond the rails and rail-to-rail output that swings within 50 mV of the rails. Single or dual supplies as low as 1.8 V (±0.9 V) and up to 5.5 V (±2.75 V) may be used. They are optimized for low-voltage single-supply operation. The OPA2333A offers excellent common-mode rejection ratio (CMRR) without the crossover associated with traditional complementary input stages. This design results in superior performance for driving analog-to-digital converters (ADCs) without degradation of differential linearity. The OPA2333A is specified for operation from –40°C to 125°C. ORDERING INFORMATION (1) PACKAGE (2) TA –40°C to 125°C (1) (2) ORDERABLE PART NUMBER TOP-SIDE MARKING SOIC – D Reel of 2500 OPA2333AQDRQ1 02333Q MSOP – DGK Reel of 2500 OPA2333AQDGKRQ1 OCOQ For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. 1 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. 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. Copyright © 2008–2010, Texas Instruments Incorporated OPA2333-Q1 SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VCC Supply voltage VI Input voltage, signal input terminals (2) IO(SS) Output short-circuit circuit (3) TA Operating free-air temperature range TJ Maximum operating virtual-junction temperature Tstg Storage temperature range ESD Electrostatic discharge (ESD) rating (1) (2) (3) 7V –0.3 V to (V+) + 0.3 Continuous –40°C to 125°C 150°C –65°C to 150°C Human-Body Model (HBM) 2000 V Charged-Device Model (CDM) 1000 V Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Input terminals are diode clamped to the power-supply rails. Input signals that can swing more than 0.3 V beyond the supply rails should be current limited to 10 mA or less. Short circuit to ground, one amplifier per package ELECTRICAL CHARACTERISTICS: VS = 1.8 V to 5.5 V Boldface limits apply over the specified temperature range, TA = –40°C to 125°C. At TA = 25°C, RL = 10 kΩ connected to VS/2, VCM = VS/2, and VOUT = VS/2 (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 2 10 mV 22 mV OFFSET VOLTAGE Input offset voltage VOS VS = 5 V over temperature vs temperature dVOS/dT vs power supply PSRR 0.02 VS = 1.8 V to 5.5 V 1 Long-term stability (1) mV/°C 6 mV/V (1) Channel separation, dc 0.1 mV/V INPUT BIAS CURRENT Input bias current IB ±70 over Temperature Input offset current ±200 ±150 IOS ±140 pA pA ±400 pA NOISE Input voltage noise, f = 0.01 Hz to 1 Hz 0.3 mVPP Input voltage noise, f = 0.1 Hz to 10 Hz 1.1 mVPP 100 fA/√Hz Input current noise, f = 10 Hz in INPUT VOLTAGE RANGE Common mode voltage range Common-Mode Rejection Ratio VCM CMRR (V–) – 0.1 (V–) – 0.1 V < VCM < (V+) + 0.1 V 102 (V+) + 0.1 V 130 dB Differential 2 pF Common mode 4 pF 130 dB INPUT CAPACITANCE OPEN-LOOP GAIN Open-loop voltage gain AOL (V–) + 100 mV < VO < (V+) – 100 mV, RL = 10 kΩ 104 FREQUENCY RESPONSE Gain-bandwidth product Slew rate (1) 2 GBW SR CL = 100 pF 350 kHz G=1 0.16 V/ms 300-hour life test at 150°C demonstrated randomly distributed variation of approximately 1 mV. Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 OPA2333-Q1 www.ti.com SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 ELECTRICAL CHARACTERISTICS: VS = 1.8 V to 5.5 V (continued) Boldface limits apply over the specified temperature range, TA = –40°C to 125°C. At TA = 25°C, RL = 10 kΩ connected to VS/2, VCM = VS/2, and VOUT = VS/2 (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 30 50 mV 85 mV OUTPUT Voltage output swing from rail RL = 10 kΩ over temperature RL = 10 kΩ Short-circuit current ISC Capacitive load drive CL ±5 mA 2 kΩ (2) Open-loop output impedance f = 350 kHz, IO = 0 POWER SUPPLY Specified voltage range Quiescent current per amplifier VS IQ 1.8 IO = 0 17 VS = 5 V 100 over temperature Turn-on time 5.5 V 25 mA 30 mA ms TEMPERATURE RANGE Specified range –40 125 °C Operating range –40 125 °C Storage range –65 150 °C Thermal resistance qJA SO-8 (D) MSOP-8 (DGK) (2) 150 °C/W 172.47 °C/W See Typical Characteristics. Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 3 OPA2333-Q1 SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 www.ti.com TYPICAL CHARACTERISTICS At TA = 25°C, VS = 5 V, and CL = 0 pF (unless otherwise noted) OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION −10 −9 −8 −7 −6 −5 −4 −3 −2 −1 0 1 2 3 4 5 6 7 8 9 10 0 0.0025 0.0050 0.0075 0.0100 0.0125 0.0150 0.0175 0.0200 0.0225 0.0250 0.0275 0.0300 0.0325 0.0350 0.0375 0.0400 0.0425 0.0450 0.0475 0.0500 Population Population OFFSET VOLTAGE PRODUCTION DISTRIBUTION Offset Voltage (µV) Offset Voltage Drift (µV/_ C) COMMON−MODE REJECTION RATIO vs FREQUENCY 140 100 200 120 80 150 100 60 100 40 50 20 0 40 −50 20 −100 0 0 −20 10 100 1k 10k 100k CMRR (dB) 250 Phase (_ ) AOL (dB) OPEN−LOOP GAIN vs FREQUENCY 120 1M 80 60 1 10 100 Frequency (Hz) 1k 10k 100k POWER−SUPPLY REJECTION RANGE vs FREQUENCY OUTPUT VOLTAGE SWING vs OUTPUT CURRENT 120 3 VS = ±2.75V VS = ±0.9V +PSRR 100 2 Output Swing (V) PSRR (dB) −PSRR 80 60 40 −40_C 1 +25_C −40_ C −1 +125_C +25_C −40_ C −3 0 10 100 1k 10k 100k 1M 0 1 Frequency (Hz) 4 +25_C +125_C 0 −2 20 1 1M Frequency (Hz) 2 3 4 5 6 7 8 9 10 Output Current (mA) Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 OPA2333-Q1 www.ti.com SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 TYPICAL CHARACTERISTICS (continued) INPUT BIAS CURRENT vs COMMON−MODE VOLTAGE INPUT BIAS CURRENT vs TEMPERATURE 100 200 80 60 VS = 5V −IB 50 IB (pA) 20 0 −20 0 +IB −50 −40 −100 −60 +IB −80 −200 1 0 +I B −150 −100 2 3 4 5 −25 −50 0 QUIESCENT CURRENT vs TEMPERATURE 50 75 100 125 LARGE−SIGNAL STEP RESPONSE 25 G=1 RL = 10kΩ Output Voltage (1V/div) 20 VS = 5.5V IQ (µA) 25 Temperature (_ C) Common−Mode Voltage (V) 15 VS = 1.8V 10 5 0 VS = 5.5V VS = 1.8V −IB 100 40 IB (pA) 150 −IB −50 −25 0 25 50 75 100 125 Time (50µs/div) Temperature (_C) SMALL−SIGNAL STEP RESPONSE Output Voltage (50mV/div) 2 V/div G = +1 RL = 10kΩ POSITIVE OVER- VOLTAGE RECOVERY 0 Input Output 1 V/div 10 kW +2.5 V 1 kW 0 1/2 OPA2333 –2.5 V Time (5µs/div) Time (50 µs/div) Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 5 OPA2333-Q1 SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) SETTLING TIME vs CLOSED−LOOP GAIN NEGATIVE OVER- VOLTAGE RECOVERY 600 Input Settling Time (µs) 2 V/div 4V Step 500 0 0 1 V/div 10 kW +2.5 V 1 kW Output 1/2 OPA2333 400 300 200 0.001% 100 0.01% –2.5 V 0 10 1 Time (50 µs/div) 100 Gain (dB) SMALL−SIGNAL OVERSHOOT vs LOAD CAPACITANCE 0.1Hz TO 10Hz NOISE 40 35 25 500nV/div Overshoot (%) 30 20 15 10 5 0 10 100 1000 1s/div Load Capacitance (pF) CURRENT AND VOLTAGE NOISE SPECTRAL DENSITY vs FREQUENCY Voltage Noise (nV//Hz) Continues with no 1/f (flicker) noise. Current Noise 100 100 Voltage Noise Current Noise (fA//Hz) 1000 1000 10 10 1 10 100 1k 10k Frequency (Hz) 6 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 OPA2333-Q1 www.ti.com SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 APPLICATION INFORMATION The OPA2333A op amps are unity-gain stable and free from unexpected output phase reversal. They use a proprietary auto-calibration technique to provide low offset voltage and very low drift over time and temperature. For lowest offset voltage and precision performance, circuit layout and mechanical conditions should be optimized. Avoid temperature gradients that create thermoelectric (Seebeck) effects in the thermocouple junctions formed from connecting dissimilar conductors. These thermally-generated potentials can be made to cancel by ensuring they are equal on both input terminals. Other layout and design considerations include: • Use low thermoelectric-coefficient conditions (avoid dissimilar metals) • Thermally isolate components from power supplies or other heat sources • Shield op amp and input circuitry from air currents, such as cooling fans Following these guidelines will reduce the likelihood of junctions being at different temperatures, which can cause thermoelectric voltages of 0.1 mV/°C or higher, depending on materials used. Operating Voltage The OPA2333A op amps operate over a power-supply range of 1.8 V to 5.5 V (±0.9 V to ±2.75 V). Supply voltages higher than 7 V (absolute maximum) can permanently damage the device. Parameters that vary over supply voltage or temperature are shown in the Typical Characteristics section of this data sheet. Input Voltage The OPA2333A input common-mode voltage range extends 0.1 V beyond the supply rails. The device is designed to cover the full range without the troublesome transition region found in some other rail-to-rail amplifiers. Normally, input bias current is about 70 pA; however, input voltages exceeding the power supplies can cause excessive current to flow into or out of the input pins. Momentary voltages greater than the power supply can be tolerated if the input current is limited to 10 mA. This limitation is easily accomplished with an input resistor(see Figure 1). +5 V IOVERLOAD 10 mA max 1/2 OPA2333 VOUT VIN 5 kW (see Note) NOTE: Current-limiting resistor required if input voltage exceeds supply rails by ≥ 0.5 V. Figure 1. Input Current Protection Internal Offset Correction The OPA2333A op amps use an auto-calibration technique with a time-continuous 350-kHz op amp in the signal path. This amplifier is zero corrected every 8 ms using a proprietary technique. Upon power up, the amplifier requires approximately 100 ms to achieve specified VOS accuracy. This design has no aliasing or flicker noise. Achieving Output Swing to the Op Amp Negative Rail Some applications require output voltage swings from 0 V to a positive full-scale voltage (such as 2.5 V) with excellent accuracy. With most single-supply op amps, problems arise when the output signal approaches 0 V, near the lower output swing limit of a single-supply op amp. A good single-supply op amp may swing close to single-supply ground, but will not reach ground. The output of the OPA2333A can be made to swing to ground or slightly below on a single-supply power source. To do so requires the use of another resistor and an additional, more negative, power supply than the op amp negative supply. A pulldown resistor may be connected between the output and the additional negative supply to pull the output down below the value that the output would otherwise achieve (see Figure 2). Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 7 OPA2333-Q1 SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 www.ti.com V+ = +5 V 1/2 OPA2333 VOUT VIN RP = 20 kW Op Amp V– = Ground -5 V Additional Negative Supply Figure 2. VOUT Range to Ground The OPA2333A has an output stage that allows the output voltage to be pulled to its negative supply rail, or slightly below, using the technique previously described. This technique only works with some types of output stages. The OPA2333A has been characterized to perform with this technique; however, the recommended resistor value is approximately 20 kΩ. Note that this configuration increases the current consumption by several hundreds of microamps. Accuracy is excellent down to 0 V and as low as –2 mV. Limiting and nonlinearity occurs below –2 mV, but excellent accuracy returns as the output is again driven above –2 mV. Lowering the resistance of the pulldown resistor allows the op amp to swing even further below the negative rail. Resistances as low as 10 kΩ can be used to achieve excellent accuracy down to –10 mV. General Layout Guidelines Attention to good layout practices is always recommended. Keep traces short and, when possible, use a printed circuit board (PCB) ground plane with surface-mount components placed as close to the device pins as possible. Place a 0.1-mF capacitor closely across the supply pins. These guidelines should be applied throughout the analog circuit to improve performance and provide benefits, such as reducing the electromagnetic interference (EMI) susceptibility. Operational amplifiers vary in their susceptibility to radio frequency interference (RFI). RFI can generally be identified as a variation in offset voltage or dc signal levels with changes in the interfering RF signal. The OPA2333A has been specifically designed to minimize susceptibility to RFI and demonstrates remarkably low sensitivity compared to previous-generation devices. Strong RF fields may still cause varying offset levels. REF3140 +5V 0.1µF 4.096V + R1 6.04kW D1 R9 150kW R5 31.6kW +5V 0.1µF - + + K-Type Thermocouple 40.7µV/°C + - R2 2.94kW R2 549W 1/2 OPA2333 R6 200W R4 6.04kW R3 60.4W VO Zero Adj. Figure 3. Temperature Measurement Figure 4 shows the basic configuration for a bridge amplifier. 8 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 OPA2333-Q1 www.ti.com SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 VEX R1 +5V R R R R 1/2 OPA2333 VOUT R1 VREF Figure 4. Single Op-Amp Bridge Amplifier A low-side current shunt monitor is shown in Figure 5. RN are operational resistors used to isolate the ADS1100 from the noise of the digital I2C bus. Since the ADS1100 is a 16-bit converter, a precise reference is essential for maximum accuracy. If absolute accuracy is not required, and the 5-V power supply is sufficiently stable, the REF3130 may be omitted. 3V +5V REF3130 Load R2 49.9kW R1 4.99kW R6 71.5kW V I LOAD RN 56W 1/2 OPA2333 RSHUNT 1W R3 4.99kW R4 48.7kW ADS1100 R7 1.18kW Stray Ground- Loop Resistance RN 56W I 2C (PGA Gain = 4) FS = 3.0V NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors. Figure 5. Low-Side Current Monitor RG RSHUNT zener(A) V+ R1(B) 10kW 1/2 OPA2333 MOSFET rated to standoff supply voltage such as BSS84 for up to 50 V. +5V V+ Two zener biasing methods are shown.(C) Output Load RBIAS RL A. Zener rated for op amp supply capability (that is, 5.1 V for OPA2333). B. Current-limiting resistor C. Choose Zener biasing resistor or dual NMOSFETs (FDG6301N, NTJD4001N, or Si1034). Figure 6. High-Side Current Monitor Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 9 OPA2333-Q1 SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 www.ti.com 100 kW 60 kW 1 MW 3V NTC Thermistor 1 MW 1/2 OPA2333 Figure 7. Thermistor Measurement V1 - In INA152 1/2 OPA2333 R2 R1 2 5 6 R2 1 3 V2 +In VO 1/2 OPA2333 VO = (1 + 2R2/R1) (V2 - V1) Figure 8. Precision Instrumentation Amplifier 10 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 OPA2333-Q1 www.ti.com SBOS463A – DECEMBER 2008 – REVISED JUNE 2010 +VS R1 100kW f LPF = 150Hz C4 1.06nF 1/2 OPA2333 RA +VS R2 100kW R6 100kW 1/2 OPA2333 +VS 3 2 LL 7 INA321(A) 4 5 R8 100kW +VS dc R3 100kW 1/2 OPA2333 Wilson LA R14 1MW GTOT = 1kV/V R7 100kW ac GINA = 5 R12 5kW 6 +VS 1/2 OPA2333 1 C3 1µF R13 318kW VOUT GOPA = 200 +VS 1/2 OPA2333 VCENTRAL C1 47pF (RA + LA + LL)/3 fHPF = 0.5Hz (provides ac signal coupling) 1/2 VS R5 390kW +VS R4 100kW R9 20kW 1/2 OPA2333 RL Inverted VCM +VS VS = +2.7V to +5.5V 1/2 OPA2333 BW = 0.5Hz to 150Hz +VS R10 1MW 1/2 VS C2 0.64µF R11 1MW fO = 0.5Hz A. Other instrumentation amplifiers can be used, such as the INA326, which has lower noise, but higher quiescent current. Figure 9. Single-Supply, Very-Low-Power ECG Circuit Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA2333-Q1 11 PACKAGE OPTION ADDENDUM www.ti.com 16-Aug-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) OPA2333AQDGKRQ1 ACTIVE VSSOP DGK 8 2500 TBD Call TI Call TI OPA2333AQDRQ1 ACTIVE SOIC D 8 2500 TBD Call TI Call TI (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. 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. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. 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