SGM MHz, 48μA, Rail-to-Rail I/O CMOS Operational Amplifier

Transcription

1 PRODUCT DESCRIPTION The is a low cost, single rail-to-rail input and output voltage feedback amplifier. It has a wide input common mode voltage range and output voltage swing, and takes the minimum operating supply voltage down to 2.1V. The maximum recommended supply voltage is 5.5V. It is specified over the extended -4 to +125 temperature range. The provides 1.1MHz bandwidth at a low current consumption of 48μA. Very low input bias current of.5pa enables 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 this amplifier include safety monitoring, portable equipment, battery and power supply control, and signal conditioning and interfacing for transducers in very low power systems. FEATURES Low Cost Rail-to-Rail Input and Output.8mV Typical V OS Unity Gain Stable Gain-Bandwidth Product: 1.1MHz Very Low Input Bias Current:.5pA Supply Voltage Range: 2.1V to 5.5V Input Voltage Range: -.1V to +5.6V with V S = 5.5V Low Supply Current: 48μA Available in Green SOT-23-5 Package PIN CONFIGURATION (TOP VIEW) The is available in the Green SOT-23-5 package. OUT 1 5 -V S APPLICATIONS +V S 2 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 +IN 3 4 SOT IN REV. B. 3

2 PACKAGE/ORDERING INFORMATION MODEL ORDER NUMBER PACKAGE DESCRIPTION PACKAGE OPTION MARKING INFORMATION XN5/TR SOT-23-5 Tape and Reel, ABSOLUTE MAXIMUM RATINGS Supply Voltage, +V S to -V S.. 6V Common Mode Input Voltage... (-V S ) -.3V to (+V S ) +.3V Storage Temperature Range.-65 to +15 Junction Temperature Package Thermal T A = +25 SOT-23-5, θ JA C/W Operating Temperature Range to +125 Lead Temperature (Soldering 1sec)...2 ESD Susceptibility HBM...4V MM...4V NOTE: 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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 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. SGMICRO reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. Please contact SGMICRO sales office to get the latest datasheet. 2

3 ELECTRICAL CHARACTERISTICS (At V S = +5V, R L = 1kΩ connected to Vs/2, and = Vs/2, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS INPUT CHARACTERISTICS TYP MIN/MAX OVER TEMPERATURE -4 to UNITS MIN/MAX +125 Input Offset Voltage V OS V CM = V S/ mv MAX Input Bias Current I B.5 pa TYP Input Offset Current I OS.5 pa TYP Input Common Mode Voltage Range V CM V S = 5.5V -.1 to V TYP Common Mode Rejection Ratio CMRR V S = 5.5V, V CM = -.1V to +4V V S = 5.5V, V CM = -.1V to +5.6V db MIN Open-Loop Voltage Gain A OL R L = 5kΩ, V O = +.1V to +4.9V R L = 1kΩ, V O = +.35V to V db MIN Input Offset Voltage Drift ΔV OS/Δ T 2.7 μv/ TYP OUTPUT CHARACTERISTICS V OH R L = 1kΩ V MIN Output Voltage Swing V OL R L = 1kΩ mv MAX V OH R L = 1kΩ V MIN V OL R L = 1kΩ mv MAX Output Current I SOURCE R L = 1Ω to V S / I SINK ma MIN POWER SUPPLY Operating Voltage Range V MIN V MAX Power Supply Rejection Ratio PSRR V S = +2.5V to +5.5V, V CM = +.5V db MIN Quiescent Current I Q μa MAX DYNAMIC PERFORMANCE (C L = 1pF) Gain-Bandwidth Product GBP 1.1 MHz TYP Slew Rate SR G = +1, 2V Output Step.52 V/μs TYP Settling Time to.1% t S G = +1, 2V Output Step 5.3 μs TYP Overload Recovery Time V IN Gain = V S 2.6 μs TYP NOISE PERFORMANCE Voltage Noise Density e n f = 1kHz 27 nv/ Hz TYP f = 1kHz 2 nv/ Hz TYP 3

4 TYPICAL PERFORMANCE CHARACTERISTICS At T A = +25, V S = +5V, and R L = 1kΩ connected to Vs/2, unless otherwise noted. Small-Signal Step Response Large-Signal Step Response G = +1 C L = 1pF R L = 1kΩ G = +1 C L = 1pF R L = 1kΩ 2mV/div 5mV/div 2μs/div 1μs/div Small-Signal Overshoot (%) Small-Signal Overshoot vs. Load Capacitance G = -5 R FB = 1kΩ Load Capacitance (pf) Small-Signal Overshoot (%) Small-Signal Overshoot vs. Load Capacitance G = -1 R FB = 1kΩ G = +1 R L = 1kΩ G = -1 R FB = 5kΩ Load Capacitance (pf) Output Voltage (V p-p ) Maximum Output Voltage vs. Frequency V S = 5V V S = 2.5V V S = 5.5V Maximum Output Voltage without Slew-Rate Induced Distortion Frequency (khz) Percentage of Amplifiers (%) Offset Voltage Production Distribution Typical production distribution of packaged units Offset Voltage (mv) 4

5 TYPICAL PERFORMANCE CHARACTERISTICS At T A = +25, V S = +5V, and R L = 1kΩ connected to V S /2, unless otherwise noted. CMRR, PSRR (db) CMRR and PSRR vs. Frequency PSRR CMRR Frequency (khz) Voltage Noise (nv/ Hz) 1 1 Input Voltage Noise Spectral Density vs. Frequency Frequency (khz) Output Voltage (V) Output Voltage vs. Output Current Sourcing Current V S = 3V Sinking Current Output Current (ma) Output Voltage (V) Output Voltage vs. Output Current Sourcing Current V S = 5V Sinking Current Output Current (ma) Supply Current (μa) Supply Current vs. Temperature Temperature ( ) Open Loop Gain (db) Open-Loop Gain vs. Temperature 12 R L = 5kΩ 11 R L = 1kΩ Temperature ( ) 5

6 TYPICAL PERFORMANCE CHARACTERISTICS At T A = +25, V S = +5V, and R L = 1kΩ connected to V S /2, unless otherwise noted Common Mode Rejection Ratio vs. Temperature -V S < V CM < (+V S ) - 1.5V Power Supply Rejection Ratio vs. Temperature CMRR (db) V S < V CM < (+V S ) PSRR (db) Temperature ( ) Temperature ( ) Supply Current vs. Supply Voltage 12 Short-Circuit Current vs. Supply Voltage Supply Current (μa) Short-Circuit Current (ma) Supply Voltage (V) Supply Voltage (V) Overload Recovery Time 2.5V Vs = 5V G = -5 V IN = 5mV V 5mV V Time (2μs/div) 6

7 APPLICATION NOTES Driving Capacitive Loads The can directly drive 25pF 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 results 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 1. 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 will be. Note that this method results in a loss of gain accuracy because R ISO forms a voltage divider with the R LOAD. Power-Supply Bypassing and Layout The operates from either a single +2.1V to +5.5V supply or dual ±1.5V to ±2.75V supplies. For single-supply operation, bypass the power supply +V S with a.1µf 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.1µf ceramic capacitors. 2.2µF tantalum capacitor can be added for better performance. +V S 1μF +V S 1μF.1μF R ISO V IN C L Figure 1. Indirectly Driving Heavy Capacitive Load Vn Vp.1μF Vn Vp 1μF An improved circuit is shown in Figure 2. 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. -V S (GND) -V S.1μF Figure 3. Amplifier with Bypass Capacitors C F R F R ISO V IN C L R L Figure 2. Indirectly Driving Heavy Capacitive Load with DC Accuracy 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. 7

8 TYPICAL APPLICATION CIRCUITS Differential Amplifier The circuit shown in Figure 4 performs the difference function. If the resistor ratios are equal to (R4/R3 = R2/R1), then = (Vp - Vn) R2/R1 + V REF. Vn Vp R1 R3 R2 Low Pass Active Filter The low pass filter shown in Figure 6 has a DC gain of (-R2/R1) and the -3dB corner frequency is 1/2 R 2 C. Make sure the filter bandwidth is within the bandwidth of the amplifier. The large values of feedback resistors 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. C R4 R1 R2 V REF V IN Figure 4. Differential Amplifier Instrumentation Amplifier The circuit in Figure 5 performs the same function as that in Figure 4 but with a high input impedance. R3 = R1 // R2 Vn R1 R2 Figure 6. Low Pass Active Filter VOUT Vp R3 R4 VREF Figure 5. Instrumentation Amplifier 8

9 PACKAGE OUTLINE DIMENSIONS SOT-23-5 D 1.9 e1 E1 E b e RECOMMENDED LAND PATTERN (Unit: mm) L A A1 A2 θ.2 c Dimensions In Millimeters Dimensions In Inches Symbol MIN MAX MIN MAX A A A b c D E E e.95 BSC.37 BSC e1 1.9 BSC.75 BSC L θ 8 8 9

10 TAPE AND REEL INFORMATION REEL DIMENSIONS TAPE DIMENSIONS P2 P W Q1 Q2 Q1 Q2 Q1 Q2 B Q3 Q4 Q3 Q4 Q3 Q4 Reel Diameter P1 A K Reel Width (W1) 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 W1 A B K P P1 P2 W Pin1 Quadrant SOT Q3 1

11 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)