Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Multi-purpose SC 70 5

OUT

+IN

GND

-IN

SM73308

www.ti.com

SNOSB90B –JUNE 2011–REVISED APRIL 2013

Low Offset, Low Noise, RRO Operational Amplifier

Check for Samples: SM73308

FEATURES

DESCRIPTION

The SM73308 is a single low noise precision

(Unless Otherwise Noted, Typical Values at V

operational amplifier intended for use in a wide range

= 2.7V)

of applications. Other important characteristics

• Renewable Energy Grade

include: an extended operating temperature range of

• Ensured 2.7V and 5V Specifications

−40°C to 125°C, the tiny SC70-5 package, and low

input bias current.

• Maximum V

850μV (Limit)

The extended temperature range of −40°C to 125°C

• Voltage noiseN

allows the SM73308 to accommodate a broad range

– f = 100 Hz 12.5nV/√Hz

of applications. The SM73308 expands TI’s Silicon

– f = 10 kHz 7.5nV/√Hz

Dust™ amplifier portfolio offering enhancements in

• Rail-to-Rail Output Swing

size, speed, and power savings. The SM73308 is

ensured to operate over the voltage range of 2.7V to

– R

= 600Ω 100mV From Rail

5.0V and has rail-to-rail output.

– R

= 2kΩ 50mV From Rail

The SM73308 is designed for precision, low noise,

• Open Loop Gain With R

= 2kΩ 100dB

low voltage, and miniature systems. This amplifier

• V

0 to V

−0.9V

provides rail-to-rail output swing into heavy loads.

• Supply Current 550µA

The maximum input offset is 850 μV at room

temperature and the input common mode voltage

• Gain Bandwidth Product 3.5MHz

range includes ground.

• Temperature Range −40°C to 125°C

The SM73308 is offered in the tiny SC70-5 package.

APPLICATIONS

• Transducer Amplifier

• Instrumentation Amplifier

• Precision Current Sensing

• Data Acquisition Systems

• Active Filters and Buffers

• Sample and Hold

• Portable/battery Powered Electronics

• Automotive

Connection Diagram

Figure 1. SC70-5 – Top View

See Package Number DCK

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.

2Silicon Dust is a trademark of Texas Instruments.

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 (25 pages)

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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 Low Offset, Low Noise, RRO Operational Amplifier Check for Samples: SM73308 FEATURES DESCRIPTION 1 The SM73308 is a single low noise precision operational amplifier intended for use in a wide range of applications. Other important characteristics include: an extended operating temperature range of −40°C to 125°C, the tiny SC70-5 package, and low input bias current. (Unless Otherwise Noted, Typical Values at VS = 2.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com Instrumentation Amplifier V1 + V01 - R2 KR2 R1 R1 R11 = a + R1 V2 + VOUT V02 R2 KR2 VO = -K (2a + 1) (V1 - V2) (1) These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 2.7V DC Electrical Characteristics (1) Unless otherwise specified, all limits are ensured for TA = 25°C. V+ = 2.7V, V − = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter VOS Input Offset Voltage TCVOS Input Offset Voltage Average Drift (4) IB Input Bias Current IOS Input Offset Current (4) Condition Min (2) Typ (3) Max (2) Units 0.3 0.85 1.0 mV −0.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 5.0V DC Electrical Characteristics www.ti.com (1) Unless otherwise specified, all limits are ensured for TA = 25°C. V+ = 5.0V, V − = 0V, VCM = V+/2, VO = V+/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol Parameter Condition VOS Input Offset Voltage TCVOS Input Offset Voltage Average Drift (4) IB Input Bias Current IOS Input Offset Current (4) Min (2) Typ (3) Max (2) Units 0.25 0.85 1.0 mV −0.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 Typical Performance Characteristics VOS vs. VCM Over Temperature VOS vs. VCM Over Temperature 4 3 VS = 2.7V -40°C 2.5 -40°C 25°C 3 25°C 85°C 2 2.5 85°C 125°C 1.5 VOS (mV) VOS (mV) VS = 5V 3.5 125°C 1 0.5 2 1.5 1 0.5 0 0 -0.5 -1 -0.5 -0.5 0 0.5 1.5 1 2 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 2.5 4.5 5 VCM (V) VCM (V) Figure 2. Figure 3. Output Swing vs. VS Output Swing vs.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) VIN vs. VOUT VIN vs. VOUT 500 500 VS = ±1.35V 400 RL = 2k: 100 0 RL = 600: -100 -200 200 RL = 2k: 100 0 RL = 600: -100 -200 -300 -300 -400 -400 -500 -1.5 TA = 25°C 300 INPUT VOLTAGE (PV) INPUT VOLTAGE (PV) 200 VS = ±2.5V 400 TA = 25°C 300 -500 -1 0.5 0 0.5 1 1.5 -3 -2 -1 OUTPUT VOLTAGE (V) 1 2 Figure 8. Figure 9. Sourcing Current vs.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Input Voltage Noise vs. Frequency Input Bias Current Over Temperature INPUT VOLTAGE NOISE (nV/ Hz) 35 30 25 20 15 VS = 2.7V 10 VS = 5V 5 0 10 100 1k 10k FREQUENCY (Hz) Figure 14. Figure 15. Input Bias Current Over Temperature Input Bias Current Over Temperature 500 50 T = 25°C 300 200 100 VS = 2.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Slew Rate vs. Supply Voltage Open Loop Frequency Response Over Temperature SLEW RATE (V/Ps) 1.8 90 70 RL = 10k: 80 60 VIN = 2VPP 25°C 70 50 1.6 GAIN (dB) 1.7 RISING EDGE 1.5 1.4 125°C GAIN 40 60 50 30 -40°C 40 20 125°C 30 10 FALLING EDGE 1.2 0 1.1 -10 3.5 4 4.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Non-Inverting Large Signal Pulse Response INPUT SIGNAL VS = ±2.5V TA = -40°C RL = 2k: TA = -40°C RL = 2k: OUTPUT SIGNAL (1 V/div) VS = ±2.5V (50 mV/div) OUTPUT SIGNAL INPUT SIGNAL Non-Inverting Small Signal Pulse Response TIME (10 Ps/div) Figure 26. Figure 27. Non-Inverting Small Signal Pulse Response Non-Inverting Large Signal Pulse Response VS = ±2.5V INPUT SIGNAL VS = ±2.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) INPUT SIGNAL Inverting Large Signal Pulse Response TA = -40°C RL = 2k: OUTPUT SIGNAL VS = ±2.5V TA = -40°C RL = 2k: (1 V/div) VS = ±2.5V (50 mV/div) OUTPUT SIGNAL INPUT SIGNAL Inverting Small Signal Pulse Response TIME (10 Ps/div) Figure 33. Inverting Small Signal Pulse Response Inverting Large Signal Pulse Response VS = ±2.5V TA = 25°C RL = 2k: OUTPUT SIGNAL VS = ±2.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Stability vs. VCM Stability vs. VCM 500 250 400 CAPACITIVE LOAD (pF) CAPACITIVE LOAD (pF) 450 350 25% OVERSHOOT 300 250 200 VS = ±2.5V 150 AV = +1 100 200 25% OVERSHOOT 150 100 VS = ±2.5V AV = +1 50 RL = 2k: 50 RL = 1M: VO = 100mV VO = 100mV 0 0 -2 -1.5 -1 -0.5 0 0.5 1 -2 1.5 -1.5 -1 VCM (V) 0 0.5 1 1.5 VCM (V) Figure 38. Figure 39. PSRR vs.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com APPLICATION NOTE SM73308 The SM73308 is a precision amplifier with very low noise and ultra low offset voltage. SM73308's extended temperature range of −40°C to 125°C enables the user to design a variety of applications including automotive. The SM73308 has a maximum offset voltage of 1mV over the extended temperature range. This makes the SM73308 ideal for applications where precision is important.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 (5) Now looking at the output of the instrumentation amplifier: KR2 VO = R2 (VO2 - VO1) = -K (VO1 - VO2) (6) Substituting from Equation 5: VO = -K (2a + 1) (V1 - V2) (7) This shows the gain of the instrumentation amplifier to be: −K(2a+1) (8) Typical values for this circuit can be obtained by setting: a = 12 and K= 4. This results in an overall gain of −100.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com C R2 R1 Vi VOUT + Figure 44.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 dB |H| |HO| -20dB/dec 0 f = fo f (Hz) Figure 45. Lowpass Filter Transfer Function HIGH PASS FILTER In a similar approach, one can derive the transfer function of a high pass filter. A typical first order high pass filter is shown below: C R1 R2 Vi VOUT + Figure 46.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com dB |H| |HO| -20dB/dec 0 f = fo f (Hz) Figure 47. Highpass Filter Transfer Function BAND PASS FILTER C2 C1 R2 R1 Vi VOUT + Figure 48. Bandpass Filter Combining a low pass filter and a high pass filter will generate a band pass filter. In this network the input impedance forms the high pass filter while the feedback impedance forms the low pass filter.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 |H | dB |HO| -20dB/dec 20dB/dec 0 f1 f (Hz) f2 Figure 49. Bandpass filter Transfer Function STATE VARIABLE ACTIVE FILTER State variable active filters are circuits that can simultaneously represent high pass, band pass, and low pass filters. The state variable active filter uses three separate amplifiers to achieve this task. A typical state variable active filter is shown in Figure 50.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com C2 R2 VO1 A2 VO2 + C3 R3 VO2 A3 V O + For A1 the relationship between input and output is: R6 -R4 VO1 = R1 V0 + R1 + R4 R1 R5 + R6 VIN + R5 R1 + R4 R5 + R6 R1 VO2 (19) This relationship depends on the output of all the filters.
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SM73308 www.ti.com SNOSB90B – JUNE 2011 – REVISED APRIL 2013 The center frequency and Quality Factor for all of these filters is the same. The values can be calculated in the following manner: 1 Zc = C 2 C 3R 2R 3 and Q= C 2R 2 R5 + R6 R1 C 3R 3 R6 R1 + R 4 (25) A design example is shown here: Designing a bandpass filter with center frequency of 10kHz and Quality Factor of 5.5 To do this, first consider the Quality Factor. It is best to pick convenient values for the capacitors.
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SM73308 SNOSB90B – JUNE 2011 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision A (April 2013) to Revision B • 20 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SM73308MG/NOPB SC70 DCK 5 SM73308MGE/NOPB SC70 DCK SM73308MGX/NOPB SC70 DCK SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 1000 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3 5 250 178.0 8.4 2.25 2.45 1.2 4.0 8.0 Q3 5 3000 178.0 8.4 2.25 2.45 1.2 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SM73308MG/NOPB SC70 DCK 5 1000 210.0 185.0 35.0 SM73308MGE/NOPB SC70 DCK 5 250 210.0 185.0 35.0 SM73308MGX/NOPB SC70 DCK 5 3000 210.0 185.0 35.
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