SGM8521/2/4 150kHz, 5.5μA, Rail-to-Rail I/O, CMOS Operational Amplifiers

Transcription

1 //4 0kHz,.μA, Rail-to-Rail I/O, GENERAL DESCRIPTION The (single), SGM8 (dual) and SGM84 (quad) are low cost, rail-to-rail input and output voltage feedback amplifiers. They have a wide input common mode voltage range and output voltage swing, and take the minimum operating supply voltage down to.v. The maximum recommended supply voltage is.v. All are specified over the extended -40 to + temperature range. The //4 provide 0kHz bandwidth at a low current consumption of.μa per amplifier. Very low input bias currents enable the //4 to be used for integrators, photodiode amplifiers, and piezoelectric sensors. Rail-to-rail input and output are useful to designers for buffering ASIC in single-supply systems. Applications for these amplifiers include safety monitoring, portable equipment, battery and power supply control, and signal conditioning and interfacing for transducers in very low power systems. The is available in Green SOT-- and SOIC-8 packages. The SGM8 is available in Green SOIC-8 and MSOP-8 packages. The SGM84 is available in Green SOIC-4 and TSSOP-4 packages. FEATURES Low Cost Rail-to-Rail Input and Output Input Offset Voltage:.mV (MAX) Unity Gain Stable Gain-Bandwidth Product: 0kHz Supply Voltage Range:.V to.v Input Voltage Range: -0.V to +.6V with V S =.V Low Supply Current:.μA/Amplifier Small Packaging Available in Green SOIC-8 and SOT-- Packages SGM8 Available in Green SOIC-8 and MSOP-8 Packages SGM84 Available in Green SOIC-4 and TSSOP-4 Packages APPLICATIONS ASIC Input or Output Amplifier Sensor Interface Piezoelectric Transducer Amplifier Medical Instrumentation Mobile Communication Audio Output Portable Systems Smoke Detectors Mobile Telephone Notebook PC PCMCIA Cards Battery-Powered Equipment JULY 07 REV. C. 4

2 //4 0kHz,.μA, Rail-to-Rail I/O, PACKAGE/ORDERING INFORMATION MODEL SGM8 SGM84 PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE ORDERING NUMBER PACKAGE MARKING PACKING OPTION SOT to + XN/TR 8 Tape and Reel, 000 SOIC-8-40 to + XS/TR SOIC-8-40 to + SGM8XS/TR MSOP-8-40 to + SGM8XMS/TR SOIC-4-40 to + SGM84XS4/TR TSSOP-4-40 to + SGM84XTS4/TR NOTE: XXXXX = Date Code and Vendor Code. XS XXXXX SGM8XS XXXXX SGM8 XMS XXXXX SGM84XS4 XXXXX SGM84 XTS4 XXXXX Tape and Reel, 00 Tape and Reel, 00 Tape and Reel, 000 Tape and Reel, 00 Tape and Reel, 000 Green (RoHS & HSF): defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If you have additional comments or questions, please contact your SGMICRO representative directly. ABSOLUTE MAXIMUM RATINGS Supply Voltage, +V S to -V S... 6V Input Common Mode Voltage Range... (-V S) - 0.V to (+V S) + 0.V Package Thermal T A = + SOT--, θ JA /W SOIC-8, θ JA... /W MSOP-8, θ JA... 6 /W Storage Temperature Range to +0 Junction Temperature Lead Temperature (Soldering 0sec) ESD Susceptibility HBM V MM V RECOMMENDED OPERATING CONDITIONS Operating Temperature Range to + OVERSTRESS CAUTION Stresses beyond those listed may cause permanent damage to the device. Functional operation of the device at these or any other conditions beyond those indicated in the operational section of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. ESD SENSITIVITY CAUTION This integrated circuit can be damaged by ESD if you don t pay attention to ESD protection. SGMICRO 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. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. DISCLAIMER reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. JULY 07

3 //4 0kHz,.μA, Rail-to-Rail I/O, PIN CONFIGURATIONS (TOP VIEW) SGM8 (TOP VIEW) OUT -V S +V S OUTA -INA +INA V S OUTB -INB +IN 4 -IN -V S 4 +INB SOT-- SOIC-8/MSOP-8 SGM84 (TOP VIEW) (TOP VIEW) OUTA 4 OUTD NC -IN 8 7 NC +V S -INA +INA +V S 4 -IND +IND -V S +IN 6 OUT +INB 0 +INC -V S 4 NC = NO CONNECT NC -INB 6 9 -INC SOIC-8 OUTB 7 8 OUTC TSSOP-4/SOIC-4 JULY 07

4 //4 0kHz,.μA, Rail-to-Rail I/O, ELECTRICAL CHARACTERISTICS (At T A = +, V S = V, R L = 00kΩ connected to V S/ and V OUT = V S/, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Offset Voltage V OS. mv Input Bias Current I B pa Input Offset Current I OS pa Input Offset Voltage Drift ΔV OS/ΔT μv/ Quiescent Current/Amplifier I Q. μa Open-Loop Voltage Gain A OL V O = 0.0V to 4.98V, R L = 00kΩ 90 0 V O = 0.V to 4.9V, R L = 00kΩ db Common Mode Rejection Ratio CMRR V S =.V, -0.V < V CM <.6V V S =.V, -0.V < V CM < 4V 70 4 db Power Supply Rejection Ratio PSRR V S =.V to.v, V CM = 0.V 6 94 db Output Current Output Voltage Swing I SOURCE 6 87 R L = 0Ω to V S/ I SINK V OH V OL ma V Gain-Bandwidth Product GBP 0 khz Slew Rate SR R L = 00kΩ 0.0 V/μs Voltage Noise Density e n f = khz 8 f = 0kHz 44 nv/ Hz JULY 07 4

5 //4 0kHz,.μA, Rail-to-Rail I/O, TYPICAL PERFORMANCE CHARACTERISTICS At T A = +, V S = V and R L = 00kΩ connected to V S/, unless otherwise noted. Small-Signal Step Response Large-Signal Step Response Output Voltage (0mV/div) V S = V C L = 00pF R L = 00kΩ Output Voltage (00mV/div) V S = V C L = 00pF R L = 00kΩ Time (0μs/div) Time (00μs/div) 90 CMRR and PSRR vs. Frequency 6 Maximum Output Voltage vs. Frequency CMRR and PSRR (db) PSRR CMRR Output Voltage (V PP ) 4 V S =.V V S =.V V S = V Frequency (khz) Frequency (khz) 70 Small-Signal Overshoot vs. Capacitive Load 90 Open-Loop Gain and Phase vs. Frequency 0 Small-Signal Overshoot (%) G = + R L = 00kΩ G = - R FB = 60kΩ Open-Loop Gain (db) Open-Loop Gain Phase Phase (degree) Load Capacitance (pf) Frequency (khz) JULY 07

6 //4 0kHz,.μA, Rail-to-Rail I/O, TYPICAL PERFORMANCE CHARACTERISTICS (continued) At T A = +, V S = V and R L = 00kΩ connected to V S/, unless otherwise noted. 9 Supply Current vs. Temperature 40 Open-Loop Gain vs. Temperature 8 0 Supply Current (μa) 7 6 Open Loop Gain (db) R L = 00kΩ R L = 00kΩ Temperature ( ) Temperature ( ) 0 CMRR vs. Temperature 40 PSRR vs. Temperature 00 CMRR_L 0 CMRR (db) CMRR_H PSRR (db) Temperature ( ) Temperature ( ) Output Voltaget (V) Output Voltage vs. Output Current Sourcing Current V S = V Sinking Current Output Current (ma) Output Voltaget (V) Output Voltage vs. Output Current + Sourcing Current + - V S = V Sinking Current Output Current (ma) JULY 07 6

7 //4 0kHz,.μA, Rail-to-Rail I/O, TYPICAL PERFORMANCE CHARACTERISTICS (continued) At T A = +, V S = V and R L = 00kΩ connected to V S/, unless otherwise noted. 0 Short-Circuit Current vs. Supply Voltage 7 Supply Current vs. Supply Voltage Short-Circuit Current (ma) Supply Current (μa) Supply Voltage (V) Supply Voltage (V) 000 Input Voltage Noise Density vs. Frequency Input Voltage Noise Density (nv/ Hz) Frequency (Hz) JULY 07 7

8 //4 0kHz,.μA, Rail-to-Rail I/O, APPLICATION NOTES Driving Capacitive Loads The //4 can directly drive 0pF in unity-gain without oscillation. The unity-gain follower (buffer) is the most sensitive configuration to capacitive loading. Direct capacitive loading reduces the phase margin of amplifiers and this result in ringing or even oscillation. Applications that require greater capacitive driving capability should use an isolation resistor between the output and the capacitive load like the circuit in Figure. The isolation resistor R ISO and the load capacitor C L form a zero to increase stability. The bigger the R ISO resistor value, the more stable V OUT will be. Note that this method results in a loss of gain accuracy because R ISO forms a voltage divider with the R LOAD. For non-buffer configuration, there are two other ways to increase the phase margin: (a) by increasing the amplifier s gain or (b) by placing a capacitor in parallel with the feedback resistor to counteract the parasitic capacitance associated with inverting node. Power-Supply Bypassing and Layout The //4 family operates from either a single.v to.v supply or dual ±.0V to ±.7V supplies. For single-supply operation, bypass the power supply +V S with a 0.µF ceramic capacitor which should be placed close to the +V S pin. For dual-supply operation, both the +V S and the -V S supplies should be bypassed to ground with separate 0.µF ceramic capacitors..µf tantalum capacitor can be added for better performance. RISO VOUT +VS +VS 0μF VIN CL 0μF 0.μF Figure. Indirectly Driving Heavy Capacitive Load 0.μF An improved circuit is shown in Figure. It provides DC accuracy as well as AC stability. R F provides the DC accuracy by connecting the inverting signal with the output. C F and R ISO serve to counteract the loss of phase margin by feeding the high frequency component of the output signal back to the amplifier s inverting input, thereby preserving phase margin in the overall feedback loop. VN VP -VS (GND) VOUT VN VP 0μF 0.μF -VS VOUT Figure. Amplifier with Bypass Capacitors CF RF RISO VOUT VIN CL RL Figure. Indirectly Driving Heavy Capacitive Load with DC Accuracy JULY 07 8

9 //4 0kHz,.μA, Rail-to-Rail I/O, APPLICATION NOTES (continued) Differential Amplifier The circuit shown in Figure 4 performs the difference function. If the resistor ratios are equal to (R 4 /R = R /R ), then V OUT = (V P - V N ) R /R + V REF. VN VP R R R VOUT Active Low-Pass Filter The low-pass filter shown in Figure 6 has a DC gain of (-R /R ) and the -db corner frequency is /πr C. Make sure the filter bandwidth is within the bandwidth of the amplifier. Feedback resistors with large values can couple with parasitic capacitance and cause undesired effects such as ringing or oscillation in high-speed amplifiers. Keep resistor values as low as possible and consistent with output loading consideration. R4 C R R VREF VIN Figure 4. Differential Amplifier Instrumentation Amplifier The circuit in Figure performs the same function as that in Figure 4 but with a high input impedance. R = R // R VOUT Figure 6. Active Low-Pass Filter R R VN VOUT VP R R4 VREF Figure. Instrumentation Amplifier JULY 07 9

10 PACKAGE INFORMATION PACKAGE OUTLINE DIMENSIONS SOT-- D.90 e E E b e RECOMMENDED LAND PATTERN (Unit: mm) L A A A θ 0. c Symbol In Millimeters In Inches MIN MAX MIN MAX A A A b c D E E e 0.90 BSC 0.07 BSC e.900 BSC 0.07 BSC L θ TX

11 PACKAGE INFORMATION PACKAGE OUTLINE DIMENSIONS SOIC-8 D e 0.6. E E. b.7 RECOMMENDED LAND PATTERN (Unit: mm) L A A θ c A Symbol In Millimeters In Inches MIN MAX MIN MAX A A A b c D E E e.7 BSC 0.00 BSC L θ TX

12 PACKAGE INFORMATION PACKAGE OUTLINE DIMENSIONS MSOP-8 b E E 4.8 e RECOMMENDED LAND PATTERN (Unit: mm) D L A A A c θ Symbol In Millimeters In Inches MIN MAX MIN MAX A A A b c D E E e 0.60 BSC 0.06 BSC L θ TX

13 PACKAGE INFORMATION PACKAGE OUTLINE DIMENSIONS SOIC-4 D E E.. e b RECOMMENDED LAND PATTERN (Unit: mm) A A A R R L L h h A θ L Symbol In Millimeters In Inches MIN MAX MIN MAX A A A A b D E E e.7 BSC 0.00 BSC L L.04 REF REF L 0. BSC 0.0 BSC R R h θ TX000.00

14 PACKAGE INFORMATION PACKAGE OUTLINE DIMENSIONS TSSOP-4 D E E b e RECOMMENDED LAND PATTERN (Unit: mm) L A A A θ H c In Millimeters In Inches Symbol MIN MAX MIN MAX A A A b c D E E e 0.60 BSC 0.06 BSC L H 0. TYP 0.0 TYP θ 7 7 TX

15 PACKAGE INFORMATION TAPE AND REEL INFORMATION REEL DIMENSIONS TAPE DIMENSIONS P P0 W Q Q Q Q Q Q B0 Q Q4 Q Q4 Q Q4 Reel Diameter P A0 K0 Reel Width (W) DIRECTION OF FEED NOTE: The picture is only for reference. Please make the object as the standard. KEY PARAMETER LIST OF TAPE AND REEL Package Type Reel Diameter Reel Width W A0 B0 K0 P0 P P W Pin Quadrant SOT Q SOIC Q MSOP Q SOIC Q TSSOP Q DD000 TX

16 PACKAGE INFORMATION CARTON BOX DIMENSIONS NOTE: The picture is only for reference. Please make the object as the standard. KEY PARAMETER LIST OF CARTON BOX Reel Type Length Width Height Pizza/Carton 7 (Option) DD000 TX