I/O Op Amps with Shutdown

Transcription

1 MHz, μa, Rail-to-Rail General Description The single MAX994/MAX995 and dual MAX996/ MAX997 operational amplifiers feature maximized ratio of gain bandwidth to supply current and are ideal for battery-powered applications such as portable instrumentation, portable medical equipment, and wireless handsets. These CMOS op amps feature an ultra-low pa input bias current, rail-to-rail inputs and outputs, low μa supply current, and operate from a single.8v to 5.5V supply. For additional power conservation, the MAX995/MAX997 feature a low-power shutdown mode that reduces supply current to na, and puts the amplifier outputs in a high-impedance state. These devices are unity-gain stable with a MHz gain-bandwidth product. The MAX994 and MAX995 are available in 5-pin and 6-pin SC7 packages, respectively. The MAX996 is available in an 8-pin SOT3 package, and the MAX997 in a -pin μmax package. All devices are specified over the -4 C to +85 C extended operating temperature range. Applications Portable Medical Devices Portable Test Equipment RF Tags Laptops Data-Acquisition Equipment Typical Operating Circuit R G* INA+ INB+ 3V V DD MAX996 OUTA OUTB IN- INA- INB- R kω R 47kΩ R3 kω OUT (R + R + R3 + R4) GAIN = (R + R3) FOR R = R4 AND R = R3 GAIN = + R4 R Features High MHz GBW Ultra-Low μa Supply Current Single.8V to 5.5V Supply Voltage Range Ultra-Low pa Input Bias Current Rail-to-Rail Input and Output Voltage Ranges Low ±μv Input Offset Voltage Low.μA Shutdown Current High-Impedance Output During Shutdown (MAX995/MAX997) Unity-Gain Stable Available in Tiny SC7, SOT3, and μmax Packages Ordering Information PART TEMP RANGE PIN- PACKAGE +Denotes a lead(pb)-free/rohs-compliant package. T = Tape and reel. TOP MARK MAX994EXK+T -4 C to +85 C 5 SC7 AGB MAX994EXK-T -4 C to +85 C 5 SC7 AGB MAX995EXT+T -4 C to +85 C 6 SC7 ACB MAX995EXT-T -4 C to +85 C 6 SC7 ACB MAX996EKA+T -4 C to +85 C 8 SOT3 AEJZ MAX996EKA-T -4 C to +85 C 8 SOT3 AEJZ MAX997EUB -4 C to +85 C µmax MAX997EUB+ -4 C to +85 C µmax Selector Guide PART AMPLIFIERS PER PACKAGE SHUTDOWN MODE PACKAGE MAX994EXK+T No 5 SC7 MAX995EXT+T Yes 6 SC7 MAX996EKA+T No 8 SOT3 MAX997EUB+ Yes µmax V SS R4 47kΩ MICROPOWER, TWO-OP-AMP INSTRUMENTATION AMPLIFIER *OPTIONAL INPUT RESISTOR R G, IS FOR GAIN ADJUSTMENT μmax is a registered trademark of Maxim Integrated Products, Inc ; Rev 3; /4

2 MHz, μa, Rail-to-Rail Absolute Maximum Ratings Power-Supply Voltage (V DD to V SS )...-.3V to +6.V IN_+, IN_-, OUT_, SHDN_...(V SS -.3V) to (V DD +.3V) Current into IN_+, IN_-...±mA Output Short-Circuit Duration to V DD or V SS...Continuous Continuous Power Dissipation (T A = +7 C) 5-Pin SC7 (derate 3.mW/ C above +7 C)...47mW 6-Pin SC7 (derate 3.mW/ C above +7 C)...45mW 8-Pin SOT3 (derate 5.mW/ C above +7 C)...48mW -Pin μmax (derate 5.6mW/ C above +7 C)...444mW Operating Temperature Range C to +85 C Junction Temperature...+5 C Storage Temperature Range C to +5 C Lead Temperature (soldering, s)...+3 C Soldering Temperature (reflow)...+6 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 DD =.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /, R L = connected to V DD /, SHDN_ = V DD, T A = +5 C, unless otherwise noted.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V DD Guaranteed by PSRR test V Supply Current I DD MAX994/MAX995 MAX996/MAX997 V DD =.8V V DD = 5.5V 5 V DD =.8V 4 V DD = 5.5V 4 5 Shutdown Supply Current I DD(SHDN_) SHDN_ = GND, MAX995/MAX µa Input Offset Voltage V OS ±. ± mv Input-Offset-Voltage Matching MAX996/MAX997 ±5 µv Input Bias Current I B (Note ) ± ± pa Input Offset Current I OS (Note ) ± ± pa Common mode Input Resistance R IN Differential mode, -mv < V IN < +mv Input Common-Mode Range V CM Guaranteed by CMRR test V SS -. V DD +. V Common-Mode Rejection Ratio CMRR -.V < V CM < V DD +.V, V DD = 5.5V 7 8 db Power-Supply Rejection Ratio PSRR.8V < V DD < 5.5V db Open-Loop Gain A VOL 5mV < V OUT < V DD - 5mV, R L = kω, V DD = 5.5V mv < V OUT < V DD - mv, RL = 5kΩ, V DD = 5.5V Output-Voltage-Swing High V OH V DD - V OUT R L = 5kΩ 5 7 R L = kω.5 5 R L = kω 5 Output-Voltage-Swing Low V OL V OUT - V SS R L = 5kΩ 5 7 R L = kω.5 5 R L = kω 5 Channel-to-Channel Isolation CH ISO Specified at DC, MAX996/MAX997 db Output Short-Circuit Current I OUT(SC) ±5 ma µa GΩ db mv mv Maxim Integrated

3 MHz, μa, Rail-to-Rail Electrical Characteristics (continued) (V DD =.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /, R L = connected to V DD /, SHDN_ = V DD, T A = +5 C, unless otherwise noted.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V DD =.8V to 3.6V, MAX995/MAX997.4 SHDN_ Logic Low V IL V DD = 3.6V to 5.5V, MAX995/MAX997.8 V DD =.8V to 3.6V, MAX995/MAX997.4 SHDN _ Logic High V IH V DD = 3.6V to 5.5V, MAX995/MAX997 SHDN_ Input Bias Current I IL SHDN_ = V SS, MAX995/MAX997 (Note ) I IH SHDN_ = V DD, MAX995/MAX997 5 Output Leakage in Shutdown I OUT(SHDN_) SHDN_ = V SS, V OUT = V to V DD, MAX995/MAX997 (V DD =.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /, R L = connected to V DD /, SHDN_ = V DD, T A = -4 C to +85 C, unless otherwise noted.) (Note ) V V na 5 na Gain-Bandwidth Product MHz Phase Margin C L = 5pF 45 degrees Gain Margin C L = 5pF db Slew Rate.5 V/µs Capacitive-Load Stability (See the Driving Capacitive Loads Section) C LOAD No sustained oscillations 3 R L = 5kΩ, R ISO = kω, Input Voltage-Noise Density f = khz 6 nv/ Hz Input Current-Noise Density f = khz. pa/ Hz Settling Time To.%, V OUT = V step, A V = -V/V 3.5 µs Delay Time to Shutdown t SH I DD = 5% of normal operation, V DD = 5.5V, V SHDN_ = 5.5V to step Delay Time to Enable t EN V OUT =.7V, V OUT settles to.%, V DD = 5.5V, V SHDN _ = to 5.5V step pf µs µs Power-Up Time V DD = to 5.5V step µs Electrical Characteristics PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V DD Guaranteed by PSRR test V MAX994/MAX995 9 Supply Current I DD V DD = 5.5V MAX996/MAX997 6 Shutdown Supply Current I DD(SHDN_) SHDN_ = GND, MAX995/MAX997 µa Input Offset Voltage V OS ±3 mv µa Maxim Integrated 3

4 MHz, μa, Rail-to-Rail Electrical Characteristics (continued) (V DD =.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /, R L = connected to V DD /, SHDN_ = V DD, T A = -4 C to +85 C, unless otherwise noted.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input-Offset-Voltage Temperature Coefficient (Note ) TC VOS ±5 µv/ C Input Bias Current I B ±3 pa Input Offset Current I OS ± pa Input Common-Mode Range V CM Guaranteed by CMRR test V SS -.5 V DD +.5 V Common-Mode Rejection Ratio CMRR -.5V < V CM < V DD +.5V, V DD = 5.5V 6 db Power-Supply Rejection Ratio PSRR.8V < V DD < 5.5V 6 db Open-Loop Gain A VOL 5mV < V OUT < V DD - 5mV, R L = kω, V DD = 5.5V 5mV < V OUT < V DD - 5mV, R L = 5kΩ, V DD = 5.5V Output-Voltage-Swing High V OH V DD - V OUT R L = kω 6 Note : Specifications are % tested at T A = +5 C (exceptions noted). All temperature limits are guaranteed by design. Note : Guaranteed by design, not production tested R L = 5kΩ 9 Output-Voltage-Swing Low V OL V OUT - V SS R L = kω 5 R L = 5kΩ 9 V DD =.8V to 3.6V, MAX995/MAX997.4 SHDN_ Logic Low V IL V DD = 3.6V to 5.5V, MAX995/MAX997.8 V DD =.8V to 3.6V, MAX995/MAX997.4 SHDN_ Logic High V IH V DD = 3.6V to 5.5V, MAX995/MAX997 SHDN_ Input Bias Current I IL SHDN_ = V SS, MAX995/MAX997 5 na I IH SHDN_ = V DD, MAX995/MAX997 na Output Leakage in Shutdown I OUT(SHDN_) SHDN_ = V SS, V OUT = V to V DD, MAX995/MAX997 db mv mv V V na Maxim Integrated 4

5 MHz, μa, Rail-to-Rail Typical Operating Characteristics (V DD = 3V, V SS = V CM = V, R L to V DD /, T A = +5 C, unless otherwise noted.) ICC (µa) VOS (µv) PSRR (db) SUPPLY CURRENT vs. SUPPLY VOLTAGE T A = +5 C T A = -4 C T A = +85 C T A = +5 C T A = -4 C T A = +85 C V SUPPLY (V) INPUT OFFSET VOLTAGE vs. TEMPERATURE DUAL SINGLE POWER-SUPPLY REJECTION RATIO vs. FREQUENCY -. k k MAX994 toc MAX994 toc4 MAX994 toc7 SHUTDOWN SUPPLY CURRENT (na) IB (pa) CMRR (db) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE I B + INPUT BIAS CURRENT vs. TEMPERATURE I B COMMON-MODE REJECTION RATIO vs. TEMPERATURE MAX994 toc MAX994 toc5 MAX994 toc8 VOS (µv) IB (pa) CMRR (db) INPUT OFFSET VOLTAGE vs. INPUT COMMON-MODE VOLTAGE T A = +85 C T A = -4 C V CM (V) T A = +5 C INPUT BIAS CURRENT vs. INPUT COMMON-MODE VOLTAGE V CM (V) COMMON-MODE REJECTION RATIO vs. FREQUENCY - k k k MAX994 toc3 MAX994 toc6 MAX994 toc9 Maxim Integrated 5

6 MHz, μa, Rail-to-Rail Typical Operating Characteristics (continued) (V DD = 3V, V SS = V CM = V, R L to V DD /, T A = +5 C, unless otherwise noted.) SLEW RATE (V/µs) AVOL (db) GAIN (db) SLEW RATE vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) OPEN-LOOP GAIN vs. TEMPERATURE (R L TO V SS ) R L = 5kΩ R L = kω R L = kω GAIN AND PHASE vs. FREQUENCY (R L = 5kΩ, C LOAD = pf) MAX994 toc GAIN PHASE - -7 k k k M M MAX994 toc MAX994 toc VOLTAGE SWING (mv) AVOL (db) PHASE (DEGREES) CROSSTALK (db) R L = kω -SWING HIGH vs. TEMPERATURE R L = kω R L = 5kΩ R L TO V SS V OH = V DD - V OUT OPEN-LOOP GAIN vs. TEMPERATURE (R L TO V DD ) R L = 5kΩ R L = kω R L = kω CROSSTALK vs. FREQUENCY MAX996/MAX997 - k k k MAX994 toc MAX994 toc4 MAX994 toc7 VOLTAGE SWING (mv) GAIN (db) THD+N (db) R L = kω -SWING LOW vs. TEMPERATURE R L = kω R L = 5kΩ R L TO V DD V OL = V OUT - V SS GAIN AND PHASE vs. FREQUENCY (R L =, C LOAD = 5pF) MAX994 toc GAIN PHASE k k k M M TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY V OUT = V P-P - k k MAX994 toc MAX994 toc8 PHASE (DEGREES) Maxim Integrated 6

7 MHz, μa, Rail-to-Rail Typical Operating Characteristics (continued) (V DD = 3V, V SS = V CM = V, R L to V DD /, T A = +5 C, unless otherwise noted.) VOLTAGE NOISE (nv/ Hz), VOLTAGE-NOISE DENSITY vs. FREQUENCY MAX994 toc9 RISO (Ω) RESISTOR ISOLATION vs. CAPACITIVE LOAD FOR NO R ISO NEEDED MAX994 toc V DD V/div 5mV/div POWER-UP SETTLING TIME MAX994 toc = V DD / k k k, C LOAD (pf) µs/div SHDN = 3V SHUTDOWN RESPONSE MAX994 toc = V DD / 3V V.5V V GAIN (db) SMALL-SIGNAL GAIN vs. FREQUENCY V OUT = mv P-P C LOAD = 5pF MAX994 toc3 GAIN (db) V OUT = V P-P C LOAD = 5pF LARGE-SIGNAL GAIN vs. FREQUENCY MAX994 toc4 µs/div - k k k M M -4 FREQUENCY (khz) SMALL-SIGNAL PULSE RESPONSE (C LOAD = 5pF) MAX994 toc5 SMALL-SIGNAL PULSE RESPONSE (C LOAD = pf) MAX994 toc6 5mV/div 5mV/div 5mV/div 5mV/div µs/div 5µs/div Maxim Integrated 7

8 MHz, μa, Rail-to-Rail Typical Operating Characteristics (continued) (V DD = 3V, V SS = V CM = V, R L to V DD /, T A = +5 C, unless otherwise noted.) LARGE-SIGNAL PULSE RESPONSE (C LOAD = 5pF) MAX994 toc7 LARGE-SIGNAL PULSE RESPONSE (C LOAD = pf) MAX994 toc8 V/div mv/div V/div V/div 5µs/div 5µs/div OVERSHOOT (%) PERCENT OVERSHOOT vs. CAPACITIVE LOAD R L = MΩ R L = kω R L = kω MAX994 toc9 INPUT 5mV/div 5mV/div WAVEFORM WITH R ISO (C LOAD = 47pF, R ISO =.3kΩ) MAX994 toc C LOAD (pf) 5µs/div WAVEFORM WITHOUT R ISO (C LOAD = 47pF) MAX994 toc3 5mV/div 5mV/div 5µs/div Maxim Integrated 8

9 MHz, μa, Rail-to-Rail Pin Description PIN MAX994 MAX995 MAX996 MAX997 NAME FUNCTION Noninverting Amplifier Input 4 4 V SS Negative Supply Voltage 3 3 IN- Inverting Amplifier Input 4 4 OUT Amplifier Output V DD Positive Supply Voltage 5 SHDN Shutdown OUTA Amplifier Output Channel A INA- Inverting Amplifier Input Channel A 3 3 INA+ Noninverting Amplifier Input Channel A 5 SHDNA Shutdown Channel A 6 SHDNB Shutdown Channel B 5 7 INB+ Noninverting Amplifier Input Channel B 6 8 INB- Inverting Amplifier Input Channel B 7 9 OUTB Amplifier Output Channel B Detailed Description Featuring a maximized ratio of gain bandwidth to supply current, low operating supply voltage, low input bias current, and rail-to-rail inputs and outputs, the MAX994 MAX997 are an excellent choice for precision or general-purpose low-current, low-voltage, battery-powered applications. These CMOS devices consume an ultra-low μa (typ) supply current and a μv (typ) offset voltage. For additional power conservation, the MAX994/ MAX997 feature a lowpower shutdown mode that reduces supply current to na (typ), and puts the amplifiers output in a highimpedance state. These devices are unity-gain stable with a MHz gain-bandwidth product driving capacitive loads up to 3pF. The capacitive load can be increased to pf when the amplifier is configured for a V/V gain. Rail-to-Rail Inputs and Outputs The MAX994 MAX997 amplifiers all have a parallelconnected n- and p-channel differential input stage that allows an input common-mode voltage range that extends mv beyond the positive and negative supply rails, with excellent common-mode rejection. The MAX994 MAX997 are capable of driving the output to within 5mV of both supply rails with a kω load. These devices can drive a 5kΩ load with swings to within 6mV of the rails. Figure shows no clipping at the output voltage swing of the MAX994 MAX997 configured as a unity-gain buffer powered from a single 3V supply. Low Input Bias Current The MAX994 MAX997 feature ultra-low pa (typ) input bias current. The variation in the input bias current is minimal with changes in the input voltage due to very high input impedance (in the order of GΩ). Applications Information Driving Capacitive Loads The MAX994 MAX997 amplifiers are unity-gain stable for loads up to 3pF. However, the capacitive load can be increased to pf when the amplifier is configured for a minimum gain of V/V. Applications that require greater capacitive drive capability should use an isolation resistor between the output and the capacitive load (Figure ). Also, in unity-gain applications with relatively small R L (about 5kΩ), the capacitive load can be increased up to pf. Maxim Integrated 9

10 MHz, μa, Rail-to-Rail Power-Supply Considerations The MAX994 MAX997 are optimized for single.8v to 5.5V supply operation. A high amplifier power-supply rejection ratio of 85dB (typ) allows the devices to be powered directly from a battery, simplifying design and extending battery life. Power-Up Settling Time The MAX994 MAX997 typically require μs after power-up. Supply settling time depends on the supply voltage, the value of the bypass capacitor, the output impedance of the incoming supply, and any lead resistance or inductance between components. Op amp settling time depends primarily on the output voltage and is slew-rate limited. Figure 3 shows the MAX99_ in a noninverting voltage follower configuration with the input held at midsupply. The output settles in approximately 3.5μs for V DD = 3V (see the Typical Operating Characteristics for the Power-Up Settling Time graph). Shutdown Mode The MAX995 and MAX997 feature active-low shutdown inputs. The MAX995 and MAX997 enter shutdown in μs (typ) and exit shutdown in μs (typ). The amplifiers outputs are high impedance in shutdown mode. Drive SHDN low to enter shutdown. Drive SHDN high to enable the amplifier. The MAX997 dual amplifier features separate shutdown inputs. Shut down both amplifiers for lowest quiescent current. Power-Supply Bypassing and Layout Bypass V DD with a.μf capacitor to ground as close to the pin as possible to minimize noise. Good layout techniques optimize performance by decreasing the amount of stray capacitance and inductance to the op amp s inputs and outputs. Minimize stray capacitance and inductance, by placing external components close to the IC. 3V V 3V V RAIL-TO-RAIL VOLTAGE RANGE V DD = 3V µs/div Figure. Rail-to-Rail Output Voltage Range MAX994 MAX997 R ISO IN_ V/div OUT_ V/div Figure. Using a Resistor to Isolate a Capacitive Load from the Op Amp V 5.5V kω IN- R L C L R L R L + R ISO V DD V SS OUT MAX99_ kω Figure 3. Power-Up Test Configuration Maxim Integrated

11 MHz, μa, Rail-to-Rail Pin Configurations TOP VIEW MAX994 MAX V DD SHDN 6 V DD V SS V SS 5 SHDN 3 4 OUT IN- IN- 3 4 OUT SC7 SC7 MAX996 MAX997 OUTA V DD OUTA V DD INA- INA OUTB INB- INA- INA+ 3 V SS 4 SHDNA OUTB INB- INB+ V SS 4 5 INB+ SHDNA 5 SHDNB 6 SHDNB SOT3 µmax Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 5 SC7 X SC7 X6SN SOT3 K μmax U Maxim Integrated

12 MHz, μa, Rail-to-Rail Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED /4 Initial release /5 Removed future product asterisks from MAX996/MAX997, edited V OL / V OH specifications in the EC table, removed MAX996 8-pin µmax package.,, 6/3 Updated Electrical Characteristics 3, 4 3 /4 Updated Absolute Maximum Ratings and Electrical Characteristics, 3, 4 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 4 Maxim Integrated Products, Inc.