1.0V Micropower, SOT23, Operational Amplifier

Transcription

1 19-3; Rev ; 1/ 1.V Micropower, SOT3, Operational Amplifier General Description The micropower, operational amplifier is optimized for ultra-low supply voltage operation. The amplifier consumes only 9µA of quiescent supply current and is fully specified for operation from a single 1.V to.v power supply. This ultra-low voltage operation together with the low quiescent current consumption make the ideal for use in battery-powered systems operated from as little as a single alkaline cell. The also features a wide input common-mode range that includes the ground, and an output voltage swing that is virtually Rail-to-Rail, allowing almost all of the power supply to be used for signal voltage. The low input offset voltage and low input bias current specifications along with the high open-loop gain make the well-suited to applications requiring a high degree of precision. The is available in a tiny -pin SOT3 package. All specifications are guaranteed over the extended temperature range of - C to + C. Single-Cell Systems Portable Electronic Equipment Battery-Powered Instrumentation Hearing Aids Using Zinc Air Battery Applications Strain Gauges Cellular Phones Notebook Computers Sensor Amplifiers Portable Communication Devices Typical Operating Characteristic Features Ultra-Low Voltage Operation: Guaranteed Specifications from 1.V to.v Input Common-Mode Range: to (V CC -.V) Ultra-Low Power Consumption: 9µA Supply Current (typ) Optimized for Operation from Single-Cell Battery-Powered Systems Compatible with 3.V and.v Single-Supply Systems Low Offset Voltage:.mV Low Input Bias Current: na High Open-Loop Voltage Gain: 9dB Rail-to-Rail Output Stage Drives kω Load No Output Phase Reversal for Overdriven Inputs Available in a Tiny -Pin SOT3 (3mm 3mm) PART Ordering Information TEMP RANGE PIN- PACKAGE TOP MARK EUT-T - C to + C SOT3- AARX ESA - C to + C SO Pin Configurations 9 POWER-SUPPLY REJECTION RATIO vs. SUPPLY VOLTAGE TOP VIEW PSRR (db) 7 T A = + C T A = + C T A = - C GND IN+ 1 V CC N.C. 3 IN- SOT3- N.C. IN- IN+ GND 1 3 SO- 7 N.C. V CC N.C SUPPLY VOLTAGE (V) Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1--9-, or visit Maxim s website at

2 1.V Micropower, SOT3, Operational Amplifier ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage (V CC to GND)...V Input Voltage (IN+ or IN-)...(V CC +.3V) to -.3V Input Current (IN+ or IN-)...mA Output Short-Circuit Duration to V CC or GND...Continuous Continuous Power Dissipation (T A = +7 C) -Pin SOT3 (derate.7mw/ C above +7 C)...9mW -Pin SO (derate.mw/ C above +7 C)...71mW Operating Temperature Range...- C to + C Junction Temperature...+1 C Storage Temperature Range...- C to +1 C Lead Temperature (soldering, 1s)...+3 C 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. ELECTRICAL CHARACTERISTICS (V CC = 3V, V CM =, V = V CC /, R L tied to V CC /, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = + C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Inferred from the T A = + C 1.. Supply Voltage Range V CC PSRR tests T A = - C to + C 1.. V CC = 1.V, T A = + C 9 1 Quiescent Supply Current I CC V CC = 3.V 1 V CC =.V 1 V µa T A = + C ±. ±. Input Offset Voltage V OS T A = T MIN to T MAX ±. mv Input Bias Current I B ± ±1 na Input Offset Current I OS ±. ±. na Differential Input Resistance R IN MΩ Input Common-Mode Voltage Range V CM Inferred from V CC = 1.V V CC -. CMRR test V CC = 3.V V CC -. V Common-Mode Rejection Ratio Power-Supply Rejection Ratio CMRR PSRR V CC = 1.V, V CC -.V 7 V CC = 1.V, V CM V CC -.V 7 V CC = 3.V, V CM V CC -.V V V CC.V, T A = + C 7 1.V V CC.V, T A = - C to + C 7 R L = 1kΩ (mv V V CC - mv) 11 Large-Signal Voltage Gain A VOL R L = kω (1mV V V CC - 1mV) 9 Specified as R L = 1kΩ. 1 Output Voltage Swing High V OH V CC - V OH R L = kω 7 R L = 1kΩ. 1 Output Voltage Swing Low V OL Specified as V OL R L = kω 7 db db db mv mv

3 1.V Micropower, SOT3, Operational Amplifier ELECTRICAL CHARACTERISTICS (continued) (V CC = 3V, V CM =, V = V CC /, R L tied to V CC /, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = + C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Sourcing/sinking V CC = 1.V. Output Short-Circuit Current I current V CC = 3.V 19 Power-Up Time t PU 3 µs Input Capacitance C IN 3. pf Gain-Bandwidth Product GBW 17 khz Phase Margin θm d egr ees Gain Margin GM 1 db Slew Rate SR V/ms Capacitive-Load Stability A VCL = +1V/V, no sustained oscillations pf Settling Time to.1% t S A VCL = +1V/V, no sustained oscillations 7 µs Note 1: All specifications are 1% production tested at T A = + C. Temperature specification limits are guaranteed by design. ma Typical Operating Characteristics (V CC = 3V, V CM =, R L to V CC /, T A = + C, unless otherwise noted.) SUPPLY CURRENT (µa) SUPPLY CURRENT V CC = 3V V CC = 1V toc1 INPUT OFFSET VOLTAGE (mv) INPUT OFFSET VOLTAGE vs. INPUT COMMON-MODE VOLTAGE toc INPUT OFFSET VOLTAGE (mv) INPUT OFFSET VOLTAGE toc INPUT COMMON-MODE VOLTAGE (V)

4 1.V Micropower, SOT3, Operational Amplifier Typical Operating Characteristics (continued) (V CC = 3V, V CM =, R L to V CC /, T A = + C, unless otherwise noted.) INPUT BIAS CURRENT (na) INPUT BIAS CURENT toc INPUT BIAS CURRENT (na) INPUT BIAS CURRENT vs. INPUT COMMON-MODE VOLTAGE INPUT COMMON-MODE VOLTAGE (V) toc VOH (mv) PUT SWING HIGH R L CONNECTED TO GND R L = 1kΩ R L = kω toc VOL (mv) PUT SWING LOW R L CONNECTED TO V CC R L = 1kΩ R L = kω OPEN-LOOP GAIN R L = kω R L CONNECTED TO GND R L = 1kΩ toc7 toc OPEN-LOOP GAIN vs. PUT SWING LOW R L = kω R L = 1kΩ V FROM GND (mv) OPEN-LOOP GAIN R L = 1kΩ R L CONNECTED TO V CC R L = kω toc toc OPEN-LOOP GAIN vs. PUT SWING HIGH R L = 1kΩ R L = kω V FROM V CC (mv) GAIN AND PHASE vs. FREQUENCY (C L = ) toc GAIN PHASE FREQUENCY (khz) toc PHASE (DEGREES)

5 1.V Micropower, SOT3, Operational Amplifier Typical Operating Characteristics (continued) (V CC = 3V, V CM =, R L to V CC /, T A = + C, unless otherwise noted.) IN mv/div SMALL-SIGNAL TRANSIENT RESPONSE toc13 IN 1V/div LARGE-SIGNAL TRANSIENT RESPONSE toc MINIMUM-OPERATING VOLTAGE PSRR > 7dB toc1 VCC (V) 1. mv/div 1V/div.9 1µs/div µs/div PUT CURRENT (ma) PUT SINKING CURRENT vs. PUT VOLTAGE V CC = 1V SINKING CURRENT toc1 PUT CURRENT (ma) 1 1 PUT SINKING CURRENT vs. PUT VOLTAGE V CC = 3V SINKING CURRENT toc PUT VOLTAGE (V) PUT VOLTAGE (V) 1.. PUT SOURCING CURRENT vs. PUT VOLTAGE V CC = 1V SOURCING CURRENT toc1 PUT SOURCING CURRENT vs. PUT VOLTAGE V CC = 3V SOURCING CURRENT toc19 PUT CURRENT (ma).. PUT CURRENT (ma) PUT VOLTAGE (V) PUT VOLTAGE (V)

6 1.V Micropower, SOT3, Operational Amplifier Pin Description PIN SO SOT3 NAME FUNCTION 1,, N.C. No Connection. Not internally connected. IN- Inverting Input 3 3 IN+ Noninverting Input GND Ground 1 Amplifier Output 7 V CC Positive Supply. Bypass with a.1µf capacitor to GND. Detailed Description The consumes ultra-low power (9µA supply current typically) and has a rail-to-rail output stage that is specifically designed for low-voltage operation. The input common-mode voltage range extends from V CC -.V to ground, although full rail-to-rail input range is possible with degraded performance. The input offset voltage is typically µv. Low-operating supply voltage, low supply current, and rail-to-rail outputs make this operational amplifier an excellent choice for precision or general-purpose, low-voltage, battery-powered systems. Rail-to-Rail Output Stage The output stage can drive a kω load and still swing to within 7mV of the rails. Figure 1 shows the output voltage swing of the configured as a unity-gain buffer, powered from a single V supply voltage. The output for this setup typically swings from +.mv to (V CC -.mv) with a 1kΩ load. Applications Information Power-Supply Considerations The operates from a single 1.V to.v supply and consumes only 9µA of supply current. A high powersupply rejection ratio of 7dB allows the amplifier to be powered directly off a decaying battery voltage, simplifying design and extending battery life. The is ideally suited for single-cell battery-powered systems. Figures and 3 show the supply current and PSRR as a function of supply voltage and temperature. V IN =.V f IN = 1kHz R L = 1kΩ µs/div Figure 1. Rail-to-Rail Input/Output Voltage Range SUPPLY CURRENT (µa) 1 1 T A = + C SUPPLY CURRENT vs. SUPPLY VOLTAGE T A = + C T A = - C IN mv/div mv/div 1 3 SUPPLY VOLTAGE (V) Figure. I CC vs. V CC Over the Temperature Range

7 1.V Micropower, SOT3, Operational Amplifier PSRR (db) 9 7 POWER-SUPPLY REJECTION RATIO vs. SUPPLY VOLTAGE T A = + C T A = - C R ISO R L C L T A = + C SUPPLY VOLTAGE (V) R A V = L 1 R L + R ISO Figure 3. PSRR vs. V CC Over the Temperature Range Figure. Using a Resistor to Isolate a Capacitive Load from the Op Amp Power-Up Settling Time The typically requires 3µs to power-up after V CC is stable. During this startup time, the output is indeterminate. The application circuit should allow for this initial delay. Driving Capacitive Loads The is unity-gain stable for loads up to pf. Applications that require greater capacitivedrive capability should use an isolation resistor between the output and the capacitive load (Figure ). Note that this solution results in a loss of gain accuracy because R ISO forms a voltage-divider with the load resistor. Power Supplies and Layout The operates from a single 1V to.v power supply. Bypass the power with a.1µf capacitor to ground. Good layout techniques optimize performance by decreasing the amount of stray capacitance at the op amp s inputs and outputs. To decrease stray capacitance, minimize trace lengths by placing external components close to the op amp s pins. Using the as a Comparator Although optimized for use as an operational amplifier, the can also be used as a rail-to-rail I/O comparator (Figure ). External hysteresis can be used to minimize the risk of output oscillation. The positive feedback circuit, shown in Figure, causes the input threshold to change when the output voltage changes state. 7

8 1.V Micropower, SOT3, Operational Amplifier INPUT V HI V OH V LO PUT HYSTERESIS V OH V OL V IN R HYST R1 V CC V R V EE V EE Figure. Hysteresis Comparator Circuit TRANSISTOR COUNT: 7 Chip Information

9 1.V Micropower, SOT3, Operational Amplifier Package Information LSOT.EPS SOICN.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 1 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.