Low-Power Single/Dual, Rail-to-Rail Op Amps

Transcription

1 19-532; Rev ; 8/1 Low-Power Single/Dual, Rail-to-Rail Op Amps General Description The are low-power precision op amps that feature precision MOS inputs. 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 are capable of operating from a 2.5V to 5.5V supply voltage over the -4NC to +125NC automotive temperature range. Both singles and duals are available in tiny SC7 packages. The MAX9614 features an active-low shutdown pin. Notebooks, Portable Media Players Industrial and Medical Sensors General Purpose Signal Processing Applications Features S VCC = 2.5V to 5.5V (-4 C to +125 C) S Low 1µV (max) VOS S 1µA Supply Current in Shutdown, 175µA Operating S Small SC7 Package S 2.8MHz Bandwidth S Excellent RF Immunity PART Ordering Information TEMP RANGE PIN- PACKAGE TOP MARK MAX9614AXT+T -4NC to +125NC 6 SC7 +ADL MAX9616AXA+T -4NC to +125NC 8 SC7 +AAE +Denotes lead(pb)-free/rohs-compliant package. T = Tape and reel. Typical Application Circuit INPUT 66.5kI 66.5kI 4.7nF 121kI 22pF V CC 2kI V CC /2 1.21kI 1nF MAX11613 ADC 2kI MAX9614 USING THE MAX9614 OUTPUT AMPLIFIER AS AN ANTI-ALIASING FILTER (CORNER FREQUENCY = 1.3kHz) TO MAXIMIZE NYQUIST BANDWIDTH. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at

2 ABSOLUTE MAXIMUM RATINGS IN+, IN-, SHDN, V CC to...-.3v to +6V OUT to...-.3v to V CC +.3V Short-Circuit () Duration, OUT, OUTA, OUTB... 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 Junction Temperature...+15NC Lead Temperature (soldering, 1s)...+3NC Soldering Temperature (reflow)...+24nc Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer 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 =, R L = 1kI to V CC /2, T A = -4NC to +125NC. Typical values are at T A = +25NC, unless otherwise noted.) (Note 2) Output Voltage Low V OL PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC CHARACTERISTICS Input Voltage Range V IN+, V IN- Guaranteed by CMRR test -.1 V CC V T A = +25NC 17 1 Input Offset Voltage V OS T A = -4NC to +125NC, after power-up autocalibration 165 FV T A = -4NC to +125NC 75 Input Offset Voltage Drift V OS - TC FV/NC T A = -4NC to +25 C Input Bias Current (Note 3) I B T A = +7NC 45 pa T A = +85NC 135 T A = +125NC 1.55 na T A = -4NC to +25 C.5 Input Offset Current (Note 3) I OS T A = +7NC 7 T A = +85NC 25 pa T A = +125NC 4 V CM = -.1V to V CC - 1.4V, T A = +25NC 8 95 Common-Mode Rejection Ratio CMRR V CM = -.1V to V CC - 1.4V, T A = -4NC to db NC +.4V P P V CC -.4V, R L = 1kI Open-Loop Gain A OL +.4V P P V CC -.4V, R L = 6I db Output Short-Circuit Current To V CC 275 I SC (Note 4) To 75 ma R L = 6I 11 1 mv R L = 1kI 1 11 R L = 32I 17 2

3 ELECTRICAL CHARACTERISTICS (continued) (V CC = V SHDN = 3.3V, V IN+ = V IN- = V CM =, 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 Output Voltage High V OH R L = 1kI R L = 6I R L = 32I 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 Power-Supply Range V CC Guaranteed by PSRR V Power-Supply Rejection Ratio PSRR T A = +25NC T A = -4NC to +125NC 83 db T A = +25NC, per amplifier Quiescent Current I CC T A = -4NC to +125NC, per amplifier 35 FA Shutdown Supply Current I SHDN MAX9614 only 1 FA Shutdown Input Low V IL MAX9614 only.5 V Shutdown Input High V IH MAX9614 only 1.4 V Output Impedance in Shutdown R OUT_SHDN MAX9614 only 1 MI Turn-On Time from SHDN t ON MAX9614 only 2 Fs Power-Up Time t UP 1 ms Note 2: All devices are 1% production tested at TA = +25NC. Temperature limits are guaranteed by design. Note 3: Guaranteed by design, not production tested. Note 4: Do not exceeed package thermal dissipation in the Absolute Maximum Ratings section. V CC - 11 V CC - 1 V CC - 2 V CC - 3 V CC - 56 mv 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 T A = +125 C T A = +25 C COMMON-MODE VOLTAGE (V) T A = +85 C T A = -4 C MAX9614 toc1 OFFSET VOLTAGE (µv) OFFSET VOLTAGE vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) MAX9614 toc2 OCCURANCE (%) OFFSET VOLTAGE HISTOGRAM OFFSET VOLTAGE (µv) MAX9614 toc SUPPLY CURRENT vs. SUPPLY VOLTAGE T A = +125 C MAX9614 toc SUPPLY CURRENT vs. TEMPERATURE R LOAD = NO LOAD MAX9614 toc5 1, 1 INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE MAX9614 toc6 SUPPLY CURRENT (µa) T A = +25 C T A = +85 C T A = -4 C SUPPLY CURRENT (µa) INPUT BIAS CURRENT (pa) T A = +125 C T A = +85 C T A = +25 C 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 MAX9614 toc7 INPUT BIAS CURRENT (pa) V CM = V INPUT BIAS CURRENT vs. TEMPERATURE MAX9614 toc8 2mV/div V CC 2V/div POWER-UP TRANSIENT MMAX 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) MAX9614 toc1 POWER-SUPPLY REJECTION RATIO (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY , FREQUENCY (khz) MAX toc11 INPUT VOLTAGE NOISE (nv/ Hz) INPUT VOLTAGE NOISE vs. FREQUENCY 1 1k 1k 1k FREQUENCY (Hz) MAX9614 toc12 INPUT CURRENT NOISE (fa/ Hz) INPUT CURRENT NOISE vs. FREQUENCY MAX toc13 2mV/div V CC 2V/div RECOVERY FROM SHUTDOWN MAX toc14 TOTAL HARMONIC DISTORTION (db) TOTAL HARMONIC DISTORTION V IN = 2V P-P A V = 1V/V MAX9614 toc k 1k 1k FREQUENCY (Hz) 1µs/div k 1k 1k FREQUENCY (Hz) 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) MAX toc16 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 MAX toc17 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 toc18 5

6 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.) 1µV/div.1Hz TO 1Hz NOISE MAX9614 toc19 OPEN-LOOP GAIN (db) OPEN-LOOP GAIN vs. FREQUENCY , FREQUENCY (khz) MAX toc2 RESISTIVE LOAD (ki) STABILITY vs. CAPACITIVE AND RESISTIVE LOAD IN PARALLEL UNSTABLE 2 STABLE CAPACITIVE LOAD (pf) MAX9614 toc21 RESISTIVE LOAD (I) STABILITY vs. CAPACITIVE WITH SERIES ISOLATION RESISTOR STABLE UNSTABLE MAX toc22 5mV/div V IN 5mV/div 1mV STEP RESPONSE C LOAD = 2pF MAX toc CAPACITIVE LOAD (pf) 1µs/div 2V STEP RESPONSE C LOAD = 2pF MAX toc24 RECOVERY FROM SATURATION OUTPUT SATURATED TO MAX toc25 1V/div 5mV/div A V = 1V/V 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 MAX toc26 A V = 1V/V 1µs/div RESISTANCE (I) OUTPUT IMPEDANCE vs. FREQUENCY , FREQUENCY (khz) MAX toc27 V IN 1V/div 1V/div NO PHASE REVERSAL 2µs/div MAX9614 toc28 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 MAX9614 MAX9616 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 the devices high precision and CMOS inputs. The MAX9614 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. 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. Applications Information Power-Up Autotrim The feature an automatic power-up autotrim that self-calibrates the VOS of these devices to less than 1FV of input offset voltage. The autotrim sequence takes approximately 1ms to complete, and is triggered by an internal power-on reset (POR) circuitry. During this time, the inputs and outputs are put into high impedance and left unconnected. This self-calibration feature allows the device to eliminate input offset voltage effects due to power supply and operating temperature variation simply by cycling its power. Take care to ensure that the power supply settles within.4ms of power-up after it crosses a POR threshold of.5v to ensure that a stable power supply is present when it steps through its autotrim sequence. If the power supply glitches below the.5v threshold, the POR circuitry reactivates during next power-up. Shutdown Operation The MAX9614 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 operate by either a 1.8V or 3.3V microcontroller. Interfacing with the MAX11613 The MAX9616 dual amplifier s low power and tiny size is ideal for driving multichannel analog-to-digital converters (ADCs) such as the MAX11613 (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. The s 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. TIME FOR POWER SUPPLY TO SETTLE V CC * 5V.5V V 2V V.4 ms AMPLIFIER AUTOTRIM 1ms Figure 1. Autotrim Timing Diagram CALIBRATED AMPLIFIER ACTIVE µmax is a registered trademark of Maxim Integrated Products, Inc. 8

9 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 the MAX9614/ MAX9616 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 output stages and high impedance CMOS inputs. The Typical Application Circuit shows an example multiple feedback active filter circuit with a corner frequency of 1.3kHz. At low frequencies, the amplifier behaves like a simple low-distortion inverting amplifier of gain = -1, while its high bandwidth gives excellent stopband attenuation above its corner frequency. See the Typical Application Circuit. PROCESS: BiCMOS Chip Information 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.