Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP

Transcription

1 19-579; Rev ; 12/1 EVALUATION KIT AVAILABLE Rail-to-Rail, 2kHz Op Amp General Description The op amp features a maximized ratio of gain bandwidth (GBW) to supply current and is ideal for battery-powered applications such as handsets, tablets, notebooks, and portable medical equipment. This CMOS op amp features an ultra-low input-bias current of 1pA, rail-to- rail input and output, low supply current of 4µA, and operates from a single 1.8V to 5.5V supply. For additional power conservation, the IC also features a low-power shutdown mode that reduces supply current to 1nA and puts the amplifier s outputs in a high-impedance state. This device is unity-gain stable with a 2kHz GBW product. It is available in a space-saving,.9mm x 1.3mm, 6-bump WLP package and is specified over the -4 C to +85 C extended operating temperature range. Cell Phones Tablet/Notebook Computers Mobile Accessories Battery-Powered Devices Applications Features 2kHz GBW Ultra-Low 4µA Supply Current Single 1.8V to 5.5V Supply Voltage Range Ultra-Low 1pA Input Bias Current Rail-to-Rail Input and Output Voltage Ranges Low ±2µV Input Offset Voltage Low.1µA Shutdown Current High-Impedance Output During Shutdown Unity-Gain Stable Available in a Tiny,.9mm x 1.3mm, 6-Bump WLP Package PART Ordering Information TEMP RANGE PIN- PACKAGE TOP MARK EWT+ -4 C to +85 C 6 WLP +BY Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 Rail-to-Rail, 2kHz Op Amp 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_-...±2mA Output Short-Circuit Duration to V DD or V SS...Continuous Continuous Power Dissipation (T A = +7 C) 6-Bump WLP (derate 1.5mW/ C above +7 C)...84mW Operating Temperature Range C to +85 C Junction Temperature C Storage Temperature Range C to +15 C Soldering Temperature (reflow) 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 = 1.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /2, R L = connected to V DD /2, SHDN_ = V DD, T A = +25 C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V DD Guaranteed by PSRR test V V DD = 1.8V 4 Supply Current I DD V DD = 5.5V 4 5. Shutdown Supply Current I DD(SHDN_) SHDN_ = GND.1.5 µa Input Offset Voltage V OS ±.2 ±1 mv Input Bias Current I B (Note 2) ±1 ±1 pa Input Offset Current I OS (Note 2) ±1 ±1 pa Common mode 1 Input Resistance R IN Differential mode, -1mV < V IN < +1mV 1 Input Common-Mode Range V CM Guaranteed by CMRR test Common-Mode Rejection Ratio CMRR -.1V < V CM < V DD +.1V, V DD = 5.5V 7 8 db Power-Supply Rejection Ratio PSRR 1.8V < V DD < 5.5V db 25mV < V OUT < V DD - 25mV, R L = 1kΩ, V DD = 5.5V Open-Loop Gain A VOL 1mV < V OUT < V DD - 1mV, R L = 5kΩ, V DD = 5.5V V SS V DD +.1 R L = 1kΩ R L = 5kΩ 5 7 Output-Voltage-Swing High V OH V DD - V OUT R L = 1kΩ 25 µa GΩ V db mv R L = 1kΩ R L = 5kΩ 5 7 Output-Voltage-Swing Low V OL V OUT - V SS R L = 1kΩ 25 mv Output Short-Circuit Current I OUT(SC) ±15 ma 2

3 Rail-to-Rail, 2kHz Op Amp ELECTRICAL CHARACTERISTICS (continued) (V DD = 1.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /2, R L = connected to V DD /2, SHDN_ = V DD, T A = +25 C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V DD = 1.8V to 3.6V.4 SHDN_ Logic Low V IL V DD = 3.6V to 5.5V.8 V DD = 1.8V to 3.6V 1.4 SHDN_ Logic High V IH V DD = 3.6V to 5.5V 2 SHDN_ Input Bias Current I IL SHDN_ = V SS (Note 2) 1 I IH SHDN_ = V DD 5 Output Leakage in Shutdown I OUT(SHDN_) SHDN_ = V SS, V OUT = V to V DD 1 5 na Gain-Bandwidth Product 2 khz Slew Rate.1 V/µs Capacitive-Load Stability (See the Driving Capacitive Loads Section) C LOAD No sustained oscillations 3 25 R L = 5kΩ, 2 R ISO = 1kΩ, 1 Input Voltage-Noise Density f = 1kHz 4 nv/ Hz Input Current-Noise Density f = 1kHz.1 pa/ Hz Settling Time To.1%, V OUT = 2V step, A V = -1V/V 18 µs Delay Time to Shutdown t SH I DD = 5% of normal operation, V DD = 5.5V, V SHDN_ = 5.5V to step V V na pf 2 µs Delay Time to Enable t EN V OUT = 2.7V, V OUT settles to.1%, V DD = 5.5V, V SHDN_ = to 5.5V step 3 µs Power-Up Time V DD = to 5.5V step 5 µs ELECTRICAL CHARACTERISTICS (V DD = 1.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /2, R L = connected to V DD /2, SHDN_ = V DD, T A = -4 C to +85 C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V DD Guaranteed by PSRR test V Supply Current I DD V DD = 5.5V 5.5 µa Shutdown Supply Current I DD(SHDN_) SHDN_ = GND 1 µa Input Offset Voltage V OS ±5 mv Input-Offset-Voltage Temperature Coefficient TC VOS ±5 µv/ C 3

4 Rail-to-Rail, 2kHz Op Amp ELECTRICAL CHARACTERISTICS (continued) (V DD = 1.8V to 5.5V, V SS = V, V CM = V, V OUT = V DD /2, R L = connected to V DD /2, SHDN_ = V DD, T A = -4 C to +85 C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Bias Current I B ±3 pa Input Offset Current I OS ±2 pa Input Common-Mode Range V CM Guaranteed by CMRR test Common-Mode Rejection Ratio CMRR -.5V < V CM < V DD +.5V, V DD = 5.5V 6 db Power-Supply Rejection Ratio PSRR 1.8V < V DD < 5.5V 59 db 25mV < V OUT < V DD - 25mV, R L = 1kΩ, V DD = 5.5V Open-Loop Gain A VOL 15mV < V OUT < V DD - 15mV, R L = 5kΩ, V DD = 5.5V R L = 1kΩ 5 Output-Voltage-Swing High V OH V DD - V OUT R L = 5kΩ 9 V SS V DD +.5 V db mv R L = 1kΩ 5 Output-Voltage-Swing Low V OL V OUT - V SS R L = 5kΩ 9 V DD = 1.8V to 3.6V.4 SHDN_ Logic Low V IL V DD = 3.6V to 5.5V.8 V DD = 1.8V to 3.6V 1.4 SHDN_ Logic High V IH V DD = 3.6V to 5.5V 2 mv V V SHDN_ Input-Bias Current I IL SHDN_ = V SS 5 na I IH SHDN_ = V DD 1 na Output Leakage in Shutdown I OUT(SHDN_) SHDN_ = V SS, V OUT = V to V DD 1 na Note 1: Specifications are 1% tested at T A = +25 C (exceptions noted). All temperature limits are guaranteed by design. Note 2: Guaranteed by design, not production tested. 4

5 Rail-to-Rail, 2kHz Op Amp Typical Operating Characteristics (V DD = 3V, V SS = V CM = V, R L to V DD /2, T A = +25 C, unless otherwise noted.) ICC (µa) SUPPLY CURRENT vs. SUPPLY VOLTAGE T A = +25 C T A = +85 C T A = -4 C V SUPPLY (V) toc1 SHUTDOWN SUPPLY CURRENT (na) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE toc2 VOS (µv) INPUT OFFSET VOLTAGE vs. INPUT COMMON-MODE VOLTAGE T A = +25 C T A = -4 C -75 T A = +85 C V CM (V) toc3 VOS (µv) INPUT OFFSET VOLTAGE vs. TEMPERATURE toc4 IB (pa) INPUT BIAS CURRENT vs. TEMPERATURE I B - I B + toc5 IB (pa) INPUT BIAS CURRENT vs. INPUT COMMON-MODE VOLTAGE toc V CM (V) PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY toc7 CMRR (db) COMMON-MODE REJECTION RATIO vs. TEMPERATURE toc8 CMRR (db) COMMON-MODE REJECTION RATIO vs. FREQUENCY toc k 1k FREQUENCY (Hz) k 1k 1k FREQUENCY (Hz) 5

6 Rail-to-Rail, 2kHz Op Amp SLEW RATE (V/µS) Typical Operating Characteristics (continued) (V DD = 3V, V SS = V CM = V, R L to V DD /2, T A = +25 C, unless otherwise noted.) SLEW RATE vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) toc1 VOLTAGE SWING (mv) R L = 1kΩ R L = 1kΩ -SWING HIGH vs. TEMPERATURE R L = 5kΩ R L TO V SS V OH = V DD - V OUT toc11 VOLTAGE SWING (mv) V OL = V OUT - V SS R L TO V DD R L = 5kΩ -SWING LOW vs. TEMPERATURE R L = 1kΩ R L = 1kΩ toc12 AVOL (db) OPEN-LOOP GAIN vs. TEMPERATURE (R L TO V SS ) R L = 1kΩ R L = 5kΩ R L = 1kΩ toc13 AVOL (db) OPEN-LOOP GAIN vs. TEMPERATURE (R L TO V DD ) R L = 1kΩ R L = 1kΩ R L = 5kΩ toc14 GAIN (db) GAIN AND PHASE vs. FREQUENCY (R L =, C LOAD = 15pF) toc GAIN PHASE PHASE (DEGREES) k 1k 1k 1M FREQUENCY (Hz) GAIN (db) GAIN AND PHASE vs. FREQUENCY (R L = 5kΩ, C LOAD = 1pF) toc GAIN PHASE k 1k 1k 1M FREQUENCY (Hz) PHASE (DEGREES) THD+N (db) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY V OUT = 2V P-P k 1k FREQUENCY (Hz) toc17 6

7 Rail-to-Rail, 2kHz Op Amp VOLTAGE NOISE (nv/ Hz) 1, 1 Typical Operating Characteristics (continued) (V DD = 3V, V SS = V CM = V, R L to V DD /2, T A = +25 C, unless otherwise noted.) VOLTAGE-NOISE DENSITY vs. FREQUENCY k 1k 1k FREQUENCY (Hz) toc18 RISO (Ω) RESISTOR ISOLATION vs. CAPACITIVE LOAD FOR NO R ISO NEEDED , C LOAD (pf) toc19 V DD 1V/div 5mV/div POWER-UP SETTLING TIME 5ns/div toc2 IN+ = V DD / 2 SHDN SHUTDOWN RESPONSE toc21 IN+ = V DD / 2 3V V IN+ 5mV/div SMALL-SIGNAL PULSE RESPONSE (C LOAD = 15pF) toc22 IN+ 5mV/div SMALL-SIGNAL PULSE RESPONSE (C LOAD = 1pF) toc23 1.5V V 5mV/div 5mV/div 2µs/div 1µs/div 2µs/div LARGE-SIGNAL PULSE RESPONSE (C LOAD = 15pF) toc24 LARGE-SIGNAL PULSE RESPONSE (C LOAD = 1pF) toc25 IN+ 1V/div IN+ 1mV/div 1V/div 1V/div 1µs/div 1µs/div 7

8 Rail-to-Rail, 2kHz Op Amp Typical Operating Characteristics (continued) (V DD = 3V, V SS = V CM = V, R L to V DD /2, T A = +25 C, unless otherwise noted.) GAIN (db) A V = +1V/V V OUT = 1mV P-P C LOAD = 15pF SMALL-SIGNAL GAIN vs. FREQUENCY FREQUENCY (khz) toc26 GAIN (db) A V = +1V/V V OUT = 2V P-P C LOAD = 15pF LARGE-SIGNAL GAIN vs. FREQUENCY 1 FREQUENCY (khz) toc PERCENT OVERSHOOT vs. CAPACITIVE LOAD R L = 1MΩ toc28 IN+ 5mV/div WAVEFORM WITH R ISO (C LOAD = 1pF, R ISO = 6.2kΩ) toc29 OVERSHOOT (%) R L = 1kΩ 5mV/div.5 R L = 1kΩ C LOAD (pf) 2µs/div WAVEFORM WITHOUT R ISO (C LOAD = 1pF) toc3 IN+ 5mV/div 5mV/div 2µs/div 8

9 Rail-to-Rail, 2kHz Op Amp TOP VIEW + IN+ V SS A1 A2 Pin Configuration IN- V DD B1 B2 OUT C1 SHDN C2 WLP BUMP SIDE DOWN Pin Description PIN NAME FUNCTION A1 IN+ Noninverting Amplifier Input A2 V SS Negative Supply Voltage B1 IN- Inverting Amplifier Input C1 OUT Amplifier Output B2 V DD Positive Supply Voltage C2 SHDN Shutdown 9

10 Rail-to-Rail, 2kHz Op Amp Detailed Description Featuring a maximized ratio of GBW to supply current, low operating supply voltage, low input bias current, and rail-to-rail inputs and outputs, the is an excellent choice for precision or general-purpose, lowcurrent, low-voltage, battery-powered applications. This CMOS device consumes an ultra-low 4µA (typ) supply current and has a 2µV (typ) offset voltage. For additional power conservation, the IC features a low-power shutdown mode that reduces supply current to 1nA (typ) and puts the amplifier s output in a high-impedance state. This device is unity-gain stable with a 2kHz GBW product, driving capacitive loads up to 3pF. The capacitive load can be increased to 25pF when the amplifier is configured for a 1V/V gain. Rail-to-Rail Inputs and Outputs The IC has a parallel-connected n- and p-channel differential input stage that allows an input common-mode voltage range that extends 1mV beyond the positive and negative supply rails, with excellent common-mode rejection. The IC is capable of driving the output to within 5mV of both supply rails with a 1kΩ load. This device can drive a 5kΩ load with swings to within 6mV of the rails. Figure 1 shows the output voltage swing of the IC configured as a unity-gain buffer powered from a single 3V supply. Low Input Bias Current The IC features ultra-low 1pA (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 1GΩ). Applications Information Driving Capacitive Loads The IC s amplifier is unity-gain stable for loads up to 3pF. However, the capacitive load can be increased to 25pF when the amplifier is configured for a minimum gain of 1V/V. Applications that require greater capacitive-drive capability should use an isolation resistor between the output and the capacitive load (Figure 2). Also, in unity-gain applications with relatively small R L (approximately 5kΩ), the capacitive load can be increased up to 2pF. 3V V 3V V RAIL-TO-RAIL VOLTAGE RANGE 2µs/div Figure 1. Rail-to-Rail Output Voltage Range IN_ 1V/div OUT_ 1V/div Figure 2. Using a Resistor to Isolate a Capacitive Load from the Op Amp R ISO R L C L R L A V = 1V/V R L + R ISO 1

11 Rail-to-Rail, 2kHz Op Amp Power-Supply Considerations The IC is optimized for single 1.8V to 5.5V supply operation. A high amplifier power-supply rejection ratio of 95dB (typ) allows the devices to be powered directly from a battery, simplifying design and extending battery life. Power-Up Settling Time The IC typically requires 5µs 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 slewrate limited. Figure 3 shows in a noninverting voltage follower configuration with the input held at midsupply. The output settles in approximately 18µs for V DD = 3V (see the Typical Operating Characteristics for power-up settling time). Shutdown Mode The IC features an active-low shutdown input. The device enters shutdown in 2µs (typ) and exit in 3µs (typ). The amplifier s outputs are in a high-impedance state in shutdown mode. Drive SHDN low to enter shutdown. Drive SHDN high to enable the amplifier. V 5.5V 1kΩ 1kΩ Figure 3. Power-Up Test Configuration Power-Supply Bypassing and Layout To minimize noise, bypass V DD with a.1µf capacitor to ground, as close to the pin as possible. Good layout techniques optimize performance by decreasing the amount of stray capacitance and inductance to the op amps inputs and outputs. Minimize stray capacitance and inductance by placing external components close to the IC. IN- IN+ V DD V SS OUT PROCESS: BiCMOS Chip Information 11

12 Rail-to-Rail, 2kHz Op Amp Package Information For the latest package outline information and land patterns, 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. 6 WLP W61B

13 Rail-to-Rail, 2kHz Op Amp REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 12/1 Initial release 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, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

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