Low-Power, High-Efficiency, Single/Dual, Rail-to-Rail I/O Op Amps

Transcription

1 ; Rev ; 8/1 Low-Power, High-Efficiency, General Description The are low-power precision op amps with rail-to-rail inputs and rail-to-rail outputs. They feature precision MOS inputs powered from an internal charge pump to eliminate crossover distortion that is common to complementary input-pair type amplifier architectures. These devices are ideal for a large number of signal processing applications such as photodiode transimpedance amplifiers and filtering/amplification of a wide variety of signals in industrial equipment. The devices also feature excellent RF immunity, making them ideal for portable applications. The feature a self-calibration system (on power-up), eliminating the effects of temperature and power-supply variations. The are capable of operating from a 1.7V to 5.5V supply voltage over the NC to +7NC temperature range, and from 1.8V to 5.5V over the -4NC to +125NC automotive temperature range. Both singles and duals are available in tiny SC7 packages. The MAX9613 features a high-impedance output while in shutdown. Notebooks, Portable Media Players Industrial and Medical Sensors General Purpose Signal Processing Applications Features S VCC = 1.7V to 5.5V ( C to +7 C) S VCC = 1.8V to 5.5V (-4 C to +125 C) S Low 1µV (max) VOS S Rail-to-Rail Inputs and Outputs S Low 22µA Supply Current, 1µA in Shutdown S Autotrim Offset Calibration S 2.8MHz Bandwidth S Excellent RF Immunity PART Ordering Information TEMP RANGE PIN- PACKAGE TOP MARK MAX9613AXT+T -4NC to +125NC 6 SC7 +ADK MAX9615AXA+T -4NC to +125NC 8 SC7 +AAD +Denotes lead(pb)-free/rohs-compliant package. T = Tape and reel. Typical Application Circuit 15nF +3.3V 2.4kI 22kI 33pF 1kI 3.3nF ADC MAX11613 MAX9613 CORNER FREQUENCY = 1kHz SALLEN-KEY FILTER Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 Low-Power, High-Efficiency, ABSOLUTE MAXIMUM RATINGS IN+, IN-, SHDN, V CC to...-.3v to +6V OUT to V to (V CC +.3V) Short-Circuit () Duration to Either Supply Rail... 5s Continuous Input Current (any pin)... Q2mA Thermal Limits (Note 1) Multilayer PCB Continuous Power Dissipation (T A = +7NC) 6-Pin SC7 (derate 3.1mW/NC above +7NC)...245mW B JA NC/W B JC...115NC/W 8-Pin SC7 (derate 3.1mW/NC above +7NC)...245mW B JA NC/W B JC...115NC/W Operating Temperature Range... -4NC to +125NC Storage Temperature Range NC to +15NC Junction Temperature...+15NC Lead Temperature (soldering, 1s)...+3NC Soldering Temperature (reflow)...+26nc Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to 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 = V SHDN = 3.3V, V IN+ = V IN- = V CM = V, R L = 1kI to V CC /2, T A = -4NC to +125NC. Typical values are at T A = +25NC, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Input Voltage Range V IN+, V IN- Guaranteed by CMRR test -.1 V CC +.1 V T A = +25NC 23 1 Input Offset Voltage V OS T A = -4NC to +125NC after power-up autocalibration 15 FV T A = -4NC to +125NC 75 Input Offset Voltage Drift V OS - TC 1 7 FV/NC T A = +4 C to +25 C Input Bias Current (Note 3) I B T A = +7 C 45 pa T A = +85 C 135 T A = +125 C 1.55 na V CM = -.1V to V CC +.1V, T A = +25NC 82 1 Common-Mode Rejection Ratio CMRR V CM = -.1V to V CC +.1V, T A = -4NC to db NC T A = +4 C to +25 C.5 Input Offset Current (Note 3) I OS T A = +7 C 7 T A = +85 C 25 pa T A = +125 C 4 Open-Loop Gain A OL +.4V P VOUT P V CC -.4V, R L = 1kI db Output Short-Circuit Current To V CC 275 I SC (Note 4) To 75 ma Output Voltage Low V OL R L = 6I.1 V R L = 1kI.11 R L = 32I.17 2

3 ELECTRICAL CHARACTERISTICS (continued) (V CC = V SHDN = 3.3V, V IN+ = V IN- = V CM = V, R L = 1kI to V CC /2, T A = -4NC to +125NC. Typical values are at T A = +25NC, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V CC - R L = 1kI.11 Output Voltage High V OH R L = 6I R L = 32I V CC -.56 AC CHARACTERISTICS Input Voltage Noise Density e n f = 1kHz 28 nv/ Hz Input Voltage Noise Total noise.1hz P f P 1Hz 5 FV P-P Input Current Noise Density I n f = 1kHz.1 fa/ Hz Gain Bandwidth GBW 2.8 MHz Slew Rate SR 1.3 V/Fs Capacitive Loading C LOAD No sustained oscillation 2 pf Total Harmonic Distortion THD f = 1kHz, = 2V P-P, A V = 1V/V 85 db POWER-SUPPLY CHARACTERISTICS Guaranteed by PSRR Power-Supply Range V CC T A = NC to +7NC, guaranteed by PSSR V Power-Supply Rejection Ratio PSRR T A = +25NC T A = -4NC to +125NC 83 db Per amplifier, T A = +25NC Quiescent Current I CC Per amplifier 42 FA Shutdown Supply Current I SHDN MAX9613 only 1 FA Shutdown Input Low V IL MAX9613 only.5 V Shutdown Input High V IH MAX9613 only 1.4 V Output Impedance in Shutdown R OUT_SHDN MAX9613 only 1 MI Turn-On Time from SHDN t ON MAX9613 only 2 Fs Power-Up Time t UP 1 ms V CC -.1 Note 2: All devices are 1% production tested at T A = +25NC. Temperature limits are guaranteed by design. Note 3: Guaranteed by design, not production tested. Note 4: Do not exceed package thermal dissipation in the Absolute Maximum Ratings section. V 3

4 Typical Operating Characteristics (V CC = 3.3V, V IN+ = VIN- = V, V CM = V CC /2, R L = 1kI to V CC /2, values are at T A = +25NC, unless otherwise noted.) OFFSET VOLTAGE (µv) OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE vs. TEMPERATURE T A = -4 C T A = +85 C T A = +25 C T A = +125 C COMMON-MODE VOLTAGE (V) MAX9613 toc1 OFFSET VOLTAGE (µv) OFFSET VOLTAGE vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) MAX9613 toc2 OCCURANCE (%) OFFSET VOLTAGE HISTOGRAM OFFSET VOLTAGE (µv) MAX9613 toc3 SUPPLY CURRENT (µa) SUPPLY CURRENT vs. SUPPLY VOLTAGE R LOAD = NO LOAD MAX9613 toc4 SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE R LOAD = NO LOAD MAX9613 toc5 INPUT BIAS CURRENT (pa) 1, INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE T A = +125 C T A = +85 C T A = +25 C MAX9613 toc T A = -4 C T A = C SUPPLY VOLTAGE (V) TEMPERATURE ( C) COMMON-MODE VOLTAGE (V) INPUT BIAS CURRENT (pa) T A = +25 C INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE MAX9613 toc7 INPUT BIAS CURRENT (pa) V CM = V INPUT BIAS CURRENT vs. TEMPERATURE MAX9613 toc8 2mV/div V CC 2V/div POWER-UP TRANSIENT MAX9613 toc COMMON-MODE VOLTAGE (V) TEMPERATURE ( C) 4ms/div 4

5 Typical Operating Characteristics (continued) (V CC = 3.3V, V IN+ = VIN- = V, V CM = V CC /2, R L = 1kI to V CC /2, values are at T A = +25NC, unless otherwise noted.) COMMON-MODE REJECTION RATIO (db) COMMON-MODE REJECTION RATIO vs. FREQUENCY , FREQUENCY (khz) MAX9613 toc1 INPUT VOLTAGE NOISE (nv/ Hz) INPUT VOLTAGE NOISE vs. FREQUENCY 1 1k 1k 1k FREQUENCY (Hz) MAX9613 toc11 INPUT CURRENT NOISE (fa/ Hz) INPUT CURRENT NOISE vs. FREQUENCY 1 1 1k 1k 1k FREQUENCY (Hz) MAX9613 toc12 2mV/div V CC 2V/div RECOVERY FROM SHUTDOWN MAX9613 toc13 1µs/div TOTAL HARMONIC DISTORTION (db) TOTAL HARMONIC DISTORTION V IN = 2V P-P A V = 1V/V k 1k 1k FREQUENCY (Hz) MAX9613 toc14 TOTAL HARMONIC DISTORTION PLUS NOISE (db) TOTAL HARMONIC DISTORTION PLUS NOISE V IN = 2V P-P A V = 1V/V k 1k 1k FREQUENCY (Hz) MAX9613 toc15 OUTPUT HIGH VOLTAGE (V) OUTPUT HIGH VOLTAGE vs. OUTPUT SOURCE CURRENT T A = +85 C T A = -4 C OUTPUT SOURCE CURRENT (ma) T A = +25 C T A = +125 C MAX9613 toc16 OUTPUT LOW VOLTAGE (V) OUTPUT LOW VOLTAGE vs. OUTPUT SINK CURRENT T A = +125 C T A = -4 C T A = +85 C T A = +25 C OUTPUT SINK CURRENT (ma) MAX toc17 1µV/div.1Hz TO 1Hz NOISE 1s/div MAX9613 toc18 5

6 Low-Power, High-Efficiency, Typical Operating Characteristics (continued) (V CC = 3.3V, V IN+ = VIN- = V, V CM = V CC /2, R L = 1kI to V CC /2, values are at T A = +25NC, unless otherwise noted.) OPEN-LOOP GAIN (db) OPEN-LOOP GAIN vs. FREQUENCY , FREQUENCY (khz) MAX9613 toc19 RESISTIVE LOAD (ki) STABILITY vs. CAPACITIVE AND RESISTIVE LOAD IN PARALLEL UNSTABLE 2 STABLE CAPACITIVE LOAD (pf) MAX9613 toc2 ISOLATION RESISTOR (I) STABILITY vs. CAPACITANCE WITH SERIES ISOLATION RESISTOR STABLE UNSTABLE MAX9613 toc21 5mV/div V IN 5mV/div 1mV STEP RESPONSE C LOAD = 2pF MAX9613 toc CAPACITIVE LOAD (pf) 1µs/div 2V STEP RESPONSE C LOAD = 2pF MAX9613 toc23 RECOVERY FROM SATURATION OUTPUT SATURATED TO MAX9613 toc24 A V = 1V/V 1V/div 5mV/div V IN 1V/div V IN 5mV/div 4µs/div 1µs/div 6

7 Typical Operating Characteristics (continued) (V CC = 3.3V, V IN+ = VIN- = V, V CM = V CC /2, R L = 1kI to V CC /2, values are at T A = +25NC, unless otherwise noted.) 1V/div V IN 1V/div RECOVERY FROM SATURATION OUTPUT SATURATED TO V CC MAX9613 toc25 A V = 1V/V 1µs/div RESISTANCE (I) OUTPUT IMPEDANCE vs. FREQUENCY , FREQUENCY (khz) MAX9613 toc26 Pin Configuration TOP VIEW NOT TO SCALE IN+ + 1 MAX V CC 2 5 SHDN 3 4 OUT + MAX IN- OUTA 1 INA- 2 INA+ 3 4 V CC OUTB INB- INB+ 6 SC7 8 SC7 Pin Description PIN MAX9613 MAX9615 NAME FUNCTION 1 IN+ Positive Input 3 INA+ Positive Input A 5 INB+ Positive Input B 2 4 Ground 3 IN- Negative Input 2 INA- Negative Input A 6 INB- Negative Input B 4 OUT Output 1 OUTA Output A 7 OUTB Output B 5 SHDN Active-Low Shutdown 6 8 V CC Positive Power Supply. Bypass with a.1ff capacitor to ground. 7

8 Detailed Description The are low-power op amps ideal for signal processing applications due to their high precision and CMOS inputs. The MAX9613 also features a low-power shutdown mode that greatly reduces quiescent current while the device is not operational. The self-calibrate on power-up to eliminate effects of temperature and power-supply variation. Crossover Distortion These op amps feature an integrated charge pump that creates an internal voltage rail 1V above VCC that is used to power the input differential pair of pmos transistors. This unique architecture eliminates crossover distortion common in traditional complementary pair type of input architecture. In these op amps, an inherent input offset voltage difference between the nmos pair and pmos pair of transistors causes signal degradation as shown in Figure 1. By using a single pmos pair of transistors, this source of input distortion is eliminated, making these parts extremely useful in noninverting configurations such as Sallen-Key filters. The charge pump requires no external components and is entirely transparent to the user. See Figure 2. RF Immunity The feature robust internal EMI filters that reduce the devices susceptibility to high-frequency RF signals such as from wireless and mobile devices. This, combined with excellent DC and AC specifications, makes these devices ideal for a wide variety of portable audio and sensitive signal-conditioning applications. INTERNAL CHARGE PUMP STANDARD INPUT STRUCTURE INPUT STRUCTURE Figure 1. Rail-to-Rail Input Stage Architectures AMPLIFIER OUTPUT CROSSOVER DISTORTION Figure 2. Crossover Distortion When Using Standard Rail-to-Rail Input Stage Architecture. The Input Stage Design Eliminates This Drawback. 8

9 Applications Information Power-Up Autotrim The feature an automatic autotrim that self-calibrates the VOS of these devices to less than 1FV of input offset voltage (Figure 3). The autotrim sequence takes approximately 3ms to complete, and is triggered by an internal power-on reset (POR) threshold of.5v. During this time, the inputs and outputs are put into high impedance and left unconnected. This selfcalibration feature allows the device to eliminate input offset voltage effects due to power supply and operating temperature variation simply by cycling its power. If the power supply glitches below the.5v threshold, the POR circuitry reactivates during next power-up. Shutdown Operation The MAX9613 features an active-low shutdown mode that puts both inputs and outputs into a high-impedance state. In this mode, the quiescent current is less than 1FA. Putting the output in high impedance allows multiple signal outputs to be multiplexed onto a single output line without the additional external buffers. The device does not self-calibrate when exiting shutdown mode, and retains its power-up trim settings. The device also instantly recovers from shutdown. The shutdown logic levels of the device are independent of supply, allowing the shutdown to be operated by either a 1.8V or 3.3V microcontroller. TIME FOR POWER SUPPLY TO SETTLE 5V V CC.5V V 2V AUTOTRIM SEQUENCE AMPLIFIER CALIBRATED ACTIVE Rail-to-Rail Input/Output The input voltage range of the extends 1mV above VCC and below ground. The wide input common-mode voltage range allows the op amp to be used as a buffer and as a differential amplifier in a wide variety of signal processing applications. Output voltage low is designed to be especially close to ground it is only 11mV above ground, allowing maximum dynamic range in single-supply applications. High output current and capacitance drive capability of the part help it to be useful in ADC driver and line driver applications. Interfacing with the MAX11613 The MAX9615 dual amplifier s low power and tiny size is ideal for driving multichannel analog-to-digital converters (ADCs) such as the MAX See the Typical Application Circuit. The MAX11613 is a low-power, 12-bit I 2 C ADC that measures either four single-ended or two differential channels in an 8-pin FMAX package. Operating from a single 3V or 3.3V supply, the MAX11613 draws a low 38FA supply current when sampling at 1ksps. The MAX11613 family also offers pincompatible 5V ADCs (MAX11612) and 8-bit (MAX1161) and 1-bit (MAX1167) options. Input Bias Current The feature a high-impedance CMOS input stage and a specialized ESD structure that allows low input bias current operation at low input common-mode voltages. Low input bias current is useful when interfacing with high-ohmic sensors. It is also beneficial for designing transimpedance amplifiers for photodiode sensors. This makes these MAX9613/ MAX9615 devices ideal for ground referenced medical and industrial sensor applications. Active Filters The are ideal for a wide variety of active filter circuits that make use of their rail-to-rail input/ output stages and high-impedance CMOS inputs. The Typical Application Circuit shows an example Sallen-Key active filter circuit with a corner frequency of 1kHz. At low frequencies, the amplifier behaves like a simple lowdistortion noninverting buffer, while its high bandwidth gives excellent stopband attenuation above its corner frequency. See the Typical Application Circuit. V.4 ms 1ms PROCESS: BiCMOS Chip Information Figure 3. Autotrim Timing Diagram µmax is a registerred trademark of Maxim Integrated Products, Inc. 9

10 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 SC7 X6SN SC7 X8SN SC7, 6L.EPS 1

11 Package Information (continued) 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. 11

12 REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 8/1 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. 12 Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.