PART* MAX4174 INPUT. Pg GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

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1 9-7; Rev ; 8/99 SOT, Rail-to-Rail, Fixed-Gain General Description The MAX7/MAX75/MAX7/MAX75 Gain- Amp family combines a low-cost Rail-to-Rail op amp with precision internal gain-setting resistors and / biasing. Factory-trimmed on-chip resistors decrease design size, cost, and layout, and provide.% gain accuracy. Fixed inverting gains from -.5V/V to -V/V or noninverting gains from +.5V/V to +V/V are available. These devices operate from a single +.5V to +5.5V supply and consume only µa. GainAmp amplifiers are optimally compensated for each gain version, achieving exceptional GBW products up to MHz (A V = +5V/V to +V/V). High-voltage fault protection withstands ±7V at either input without excessive current draw. Three versions are available in this amplifier family: single/ dual/quad open-loop, unity-gain stable (MAX8/ MAX8/MAX8); single/dual fixed gain (MAX7/ MAX7); and single/dual fixed gain plus internal / bias at the noninverting input (MAX75/ MAX75), which simplifies input biasing in single-supply designs. The input common-mode voltage range of the open-loop amplifiers extends from 5mV below the negative supply to within.v of the positive supply. The outputs can swing rail-to-rail and drive a k Ω load while maintaining excellent DC accuracy. The amplifier is stable for capacitive loads up to 7pF. Portable Instruments Instruments, Terminals, and Bar-Code Readers Keyless Entry Photodiode Preamps TOP VIEW OUT Applications Smart-Card Readers Infrared Receivers for Remote Controls Low-Side Current-Sense Amplifiers Pin Configurations MAX7 RG 5 IN+ IN- SOT Pin Configurations continued at end of data sheet. + Features GainAmp Family Provides Internal Precision Gain-Setting Resistors in SOT (MAX7/5).% Gain Accuracy ( / ) (MAX7/5, MAX7/5) 5 Standard Gains Available (MAX7/5, MAX7/5) Open-Loop Unity-Gain-Stable Op Amps (MAX8//) Rail-to-Rail Outputs Drive kω Load Internal / Biasing (MAX75/MAX75) +.5V to +5.5V Single Supply µa Supply Current Up to MHz GBW Product Fault-Protected Inputs Withstand ±7V Stable with Capacitive Loads Up to 7pF with No Isolation Resistor PART* Ordering Information TEMP. RANGE PIN- PACKAGE MAX7_EUK-T - C to +85 C 5 SOT MAX75_EUK-T - C to +85 C 5 SOT Ordering Information continued at end of data sheet. * Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number. Refer to the Gain Selection Guide for a list of preferred gains and SOT Top Marks. Selector Guide appears at end of data sheet..µf INPUT.µF IN+ IN- Typical Operating Circuit R B R B +5V MAX75 OUT TOP MARK.µF MAX7/5, MAX7/5, MAX8// Pg GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Maxim Integrated Products For free samples & the latest literature: or phone For small orders, phone

2 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// ABSOLUTE MAXIMUM RATINGS Supply Voltage ( to )...-.V to +6V Voltage Inputs (IN_) MAX8/8/8...( -.V) to ( +.V) MAX7/75/7/75 (with respect to GND)...±7V Output Short-Circuit Duration (OUT_)...Continuous to Either or Continuous Power Dissipation (T A = +7 C) 5-Pin SOT (derate 7.mW/ C above +7 C)...57mW 8-Pin SO (derate 5.88mW/ C above +7 C)...7mW 8-Pin µmax (derate.mw/ C above +7 C)...mW -Pin SO (derate 8.mW/ C above +7 C)...667mW 6-Pin QSOP (derate 8.mW/ C above +7 C)...667mW Operating Temperature Range...- C to +85 C Maximum Junction Temperature...+5 C Storage Temperature Range...5 C to +5 C Lead Temperature (soldering, sec)...+ C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICSMAX7/MAX75/MAX7/MAX75 Fixed-Gain Amplifiers ( = +.5V to +5.5V, =, V IN+ = V IN- = /, R L to /, R L = open, T A = T MIN to T MAX, unless otherwise noted. Typical values are at = +5V and T A = +5 C.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX Supply Voltage Range Guaranteed by PSRR tests = V 6 MAX7/MAX7 Supply Current = 5V 5 I CC (per Amplifier) MAX75/MAX75, = V 8 includes / bias resistors = 5V 55 5 Input Offset Voltage V OS R L = kω ±.5 ±.5 Input Offset Voltage Drift ±5 Input Bias Current I BIAS IN_+, MAX7/MAX7 (Note ) ±.5 ± Inverting Input Resistance A V < 5V/V 5 A V > 5V/V Noninverting Input MAX7/MAX7 Resistance MAX75/MAX75 75 IN_+ Bias Voltage MAX75/MAX75, V IN + = V IN - / / IN_+ Input Voltage Range Guaranteed by functional test (Note ) -. IN_- Input Voltage Range Guaranteed by functional test Power-Supply Rejection Ratio PSRR =.5V to 5.5V 7 9 Closed-Loop Output Impedance R OUT. Short-Circuit Current Shorted to Shorted to 65 - V OH 8 R L = kω Output Voltage Swing V OL - 8 V OH /V OL (Note ) - V OH 5 5 R L = kω V OL UNITS V µa mv µv/ C na kω MΩ kω V V V db Ω ma mv

3 SOT, Rail-to-Rail, Fixed-Gain ELECTRICAL CHARACTERISTICSMAX7/MAX75/MAX7/MAX75 Fixed-Gain Amplifiers (continued) ( = +.5V to +5.5V, =, V IN+ = V IN- = /, R L to /, R L = open, T A = T MIN to T MAX, unless otherwise noted. Typical PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Up Time Output settling to % ms Slew Rate SR = 5V, V OUT = V step.7 V/µs Settling Time to Within.% Input Noise Voltage Density Input Noise Current Density Capacitive Load Stability DC Gain Accuracy -db Bandwidth e n i n C LOAD BW -db = 5V, V OUT = V step 7 µs f = khz (Note 5) f = khz No sustained oscillations ( + 5mV) < V OUT < ( - 5mV), R L = kω (Note 6) Gain = +.5V/V Gain = +V/V Gain = +5V/V Gain = +V/V Gain = +5V/V Gain = +5V/V ELECTRICAL CHARACTERISTICSMAX8/MAX8/MAX8 Open-Loop Op Amps nv/ Hz fa/ Hz pf ( = +.5V to +5.5V, =, V IN+ = V IN- = /, R L to /, R L = open, T A = T MIN to T MAX, unless otherwise noted. Typical values are at = +5V and T A = +5 C.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range Guaranteed by PSRR tests V Supply Current = V 9 5 µa I CC (per Amplifier) = 5V 5 µa Input Offset Voltage V OS R L = kω ±.5 ± mv Input Offset Voltage Drift ±5 µv/ C Input Bias Current I BIAS ±.5 ± na Input Offset Current I OS ± ± pa Input Resistance R IN Differential or common mode MΩ Input Capacitance C IN.5 pf Common-Mode Input Voltage Range CMVuaranteed by CMRR test V % khz MAX7/5, MAX7/5, MAX8// Common-Mode Rejection Ratio CMRR -.5V V CM -.V 6 9 db Power-Supply Rejection Ratio PSRR =.5V to 5.5V 7 9 db Closed-Loop Output Impedance R OUT A V = V/V. Ω

4 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// ELECTRICAL CHARACTERISTICSMAX8/MAX8/MAX8 Open-Loop Op Amps (continued) ( = +.5V to +5.5V, =, V IN+ = V IN- = /, R L to /, R L = open, T A = T MIN to T MAX, unless otherwise noted. Typical values are at = +5V and T A = +5 C.) (Note ) Gain Bandwidth Product Slew Rate PARAMETER Short-Circuit Current Large-Signal Voltage Gain Output Voltage Swing Settling Time to within.% Input Noise Voltage Density Input Noise Current Density Capacitive Load Stability Power-Up Time SYMBOL A VOL V OH /V OL GBW SR e n i n C LOAD Shorted to Shorted to +.5V < V OUT < -.V, R L = kω +.5V < V OUT < -.V, R L = kω - V OH R L = kω V OL - - V OH R L = kω V OL - = 5V, V OUT = V step = 5V, V OUT = V step f = khz f = khz CONDITIONS No sustained oscillations, A V = V/V Output settling to % MIN TYP MAX Note : MAX7/MAX75/MAX8 and MAX7/MAX75/MAX8 and MAX8 are % production tested at T A = +5 C. All temperature limits are guaranteed by design. Note : Guaranteed by design. Note : The input common-mode range for IN_+ is guaranteed by a functional test. A similar test is done on the IN_- input. See the Applications Information section for more information on the input voltage range of the GainAmp. Note : For A V = -.5V/V and A V = -.5V/V, the output voltage swing is limited by the input voltage range. Note 5: Includes noise from on-chip resistors. Note 6: The gain accuracy test is performed with the GainAmp in noninverting configuration. The output voltage swing is limited by the input voltage range for certain gains and supply voltage conditions. For situations where the output voltage swing is limited by the valid input range, the output limits are adjusted accordingly. Typical Operating Characteristics ( = +5V, R L = kω to /, small-signal V OUT = mvp-p, large-signal V OUT = Vp-p, T A = +5 C, unless otherwise noted.) UNITS ma ma db db mv MHz V/µs µs nv/ Hz fa/ Hz pf ms LARGE-SIGNAL GAIN A V = +.5V/V A V = +.5V/V MAX7 TOC LARGE-SIGNAL GAIN A V = +.5V/V A V = +V/V MAX7 TOC LARGE-SIGNAL GAIN A V = +5V/V A V = +9V/V MAX7 TOC k k k M M k k k M M k k k M M

5 SOT, Rail-to-Rail, Fixed-Gain Typical Operating Characteristics (continued) ( = +5V, R L = kω to /, small-signal V OUT = mvp-p, large-signal V OUT = Vp-p, T A = +5 C, unless otherwise noted.) LARGE-SIGNAL GAIN A V = +V/V A V = +V/V k k k M SMALL-SIGNAL GAIN A V = +.5V/V A V = +.5V/V k k k M MAX7 TOC M MAX7 TOC7 M MAX7/MAX75 LARGE-SIGNAL GAIN A V = +5V/V A V = +5V/V k k k M SMALL-SIGNAL GAIN A V = +.5V/V A V = +V/V k k k M MAX7 TOC5 M MAX7 TOC8 M LARGE-SIGNAL GAIN A V = +V/V A V = +5V/V k k k M SMALL-SIGNAL GAIN A V = +9V/V A V = +5V/V k k k M MAX7 TOC6 M MAX7 TOC9 M MAX7/5, MAX7/5, MAX8// SMALL-SIGNAL GAIN A V = +V/V A V = +V/V MAX7 TOC SMALL-SIGNAL GAIN A V = +5V/V A V = +5V/V MAX7 TOC SMALL-SIGNAL GAIN A V = +V/V A V = +5V/V MAX7 TOC k k k M M k k k M M k k k M M 5

6 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// Typical Operating Characteristics (continued) ( = +5V, R L = kω to /, small-signal V OUT = mvp-p, large-signal V OUT = Vp-p, T A = +5 C, unless otherwise noted.) THD (db) THD (db) TOTAL HARMONIC DISTORTION V OUT = Vp-p A V = +V/V A V = +.5V/V A V = +V/V k k k M f = khz TOTAL HARMONIC DISTORTION vs. VOLTAGE SWING A V = +V/V A V = +V/V VOLTAGE SWING (Vp-p) A V = +.5V/V MAX7/MAX75 MAX7 TOC MAX7 TOC5 THD (db) THD (db) TOTAL HARMONIC DISTORTION V OUT = Vp-p A V = +5V/V A V = +5V/V k k k M TOTAL HARMONIC DISTORTION vs. VOLTAGE SWING f = khz A V = +5V/V A V = +5V/V VOLTAGE SWING (Vp-p) MAX7 TOC MAX7 TOC6 VOLTAGE NOISE DENSITY (nv/ Hz) VOLTAGE NOISE DENSITY (A V = +.5, +, +) A V = +V/V A V = +V/V A V = +.5V/V MAX7/5 toc 7 VOLTAGE NOISE DENSITY (nv/ Hz) VOLTAGE NOISE DENSITY (A V = +5, +5) A V = +5V/V A V = +5V/V MAX7/5 toc 8 CURRENT NOISE DENSITY (fa/ Hz) CURRENT NOISE DENSITY vs. FREQUENCY MAX7/5 toc9 k k k INCLUDES RESISTOR NOISE k k k k k k 6

7 SOT, Rail-to-Rail, Fixed-Gain Typical Operating Characteristics (continued) ( = +5V, R L = kω to /, small-signal V OUT = mvp-p, large-signal V OUT = Vp-p, T A = +5 C, unless otherwise noted.) INPUT VOLTAGE A V = +.5V/V 5mV/div A V = +V/V 5mV/div A V = +5V/V 5mV/div A V = +V/V 5mV/div LARGE-SIGNAL PULSE RESPONSE MAX7/MAX75 MAX7/5 toc INPUT VOLTAGE A V = +.5V/V 5mV/div A V = +V/V 5mV/div A V = +5V/V 5mV/div A V = +V/V 5mV/div SMALL-SIGNAL PULSE RESPONSE MAX7/5 toc MAX7/5, MAX7/5, MAX8// A V = +5V/V 5mV/div A V = +5V/V 5mV/div A V = +5V/V 5mV/div A V = +5V/V 5mV/div C L = µs/div C L = µs/div 7

8 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// Typical Operating Characteristics (continued) ( = +5V, R L = kω to /, small-signal V OUT = mvp-p, large-signal V OUT = Vp-p, T A = +5 C, unless otherwise noted.) PSR (db) POWER-SUPPLY REJECTION k k k INPUT OFFSET VOLTAGE (µv) MAX7/MAX75/MAX8/MAX8/MAX8 INPUT OFFSET VOLTAGE vs. TEMPERATURE =.5V = 5.5V MAX7 TOC M TEMPERATURE ( C) IMPEDANCE (Ω).. MAX7/5 toc 5 IMPEDANCE k k k INPUT BIAS CURRENT (pa) MAX7 TOC M VSWING (Vp-p) INPUT BIAS CURRENT vs. TEMPERATURE TEMPERATURE ( C) VOLTAGE SWING vs. R LOAD R LOAD (kω) = 5.5V =.5V MAX7/5 toc 6 MAX7 TOC SUPPLY CURRENT (µa) SUPPLY CURRENT vs. TEMPERATURE = 5.5V = V = 5V TEMPERATURE ( C) = V =.5V MAX7/5 toc 7 VOLTAGE (mv) V OH AND V OL vs. TEMPERATURE ( =.5V) V OH, R L = kω V OL, R L = kω V OH, R L = kω V OL, R L = kω V OH, R L = kω V OL, R L = kω TEMPERATURE ( C) MAX7/5 toc 8 VOLTAGE (mv) V OH AND V OL vs. TEMPERATURE ( = 5.5V) 8 6 V OH, R L = kω 8 V OH, R L = kω 6 V OH, R L = kω V OL, R L = kω - - V OL, R L = kω -8 V OL, R L = kω TEMPERATURE ( C) MAX7/5 toc 9 8

9 SOT, Rail-to-Rail, Fixed-Gain Typical Operating Characteristics ( = +5V, R L = kω to /, small-signal V OUT = mvp-p, large-signal V OUT = Vp-p, T A = +5 C, unless otherwise noted.) MAX8/MAX8/MAX8 OPEN-LOOP GAIN (db) CMR (db) OPEN-LOOP GAIN AND PHASE k k k M M COMMON-MODE REJECTION k k k M M MAX7/5 toc PHASE (degrees) MAX7/5 toc GAIN (db) VOLTAGE NOISE DENSITY (nv/ Hz) SMALL-SIGNAL GAIN k k k M M VOLTAGE NOISE DENSITY k k k MAX7/5 toc MAX7/5 toc GAIN (db) CURRENT NOISE DENSITY (fa/ Hz) LARGE-SIGNAL GAIN k k k M M CURRENT NOISE DENSITY k k k MAX7/5 toc MAX7/5 toc5 MAX7/5, MAX7/5, MAX8// THD (db) TOTAL HARMONIC DISTORTION A V = - V OUT = Vp-p k k k MAX7/5 toc6 M CROSSTALK (db) MAX8 CROSSTALK k k k M MAX7/5 toc7 M CROSSTALK (db) MAX8 CROSSTALK THREE AMPLIFIERS DRIVEN, ONE MEASURED -75 k k k M MAX7/5 toc8 M 9

10 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// MAX8 5 SOT 8 SO 5 6 7, 5, 8 MAX7/ MAX75 5 SOT 5 MAX8 8 SO/µMAX 8 SO/µMAX, 7, 5, 6 8 PIN MAX7/ MAX75, 7, 5, 6 8 SO/TSSOP, 7, 8,, 5,,, 6, 9, MAX8 6 QSOP, 7,, 6, 5,,, 6,, 5 8, 9 NAME NAME OUT, OUTA, OUTB, OUTC, OUTD IN+, INA+, INB+, INC+, IND+ IN-, INA-, INB-, INC-, IND- N.C. Pin Description Functional Diagrams FUNCTION FUNCTION Amplifier Output Negative Supply or Ground Noninverting Amplifier Input. Internally biased to / for MAX75/MAX75 Inverting Amplifier Input. Connects to for MAX7/ 75/7/75. Positive Supply No Connection. Not internally connected. IN+ MAX8 OUT IN+ MAX7 OUT IN+ R B 5k MAX75 IN- IN- IN- R B 5k RF OUT

11 SOT, Rail-to-Rail, Fixed-Gain Detailed Description Maxim s GainAmp fixed-gain amplifiers combine a lowcost rail-to-rail op amp with internal gain-setting resistors. Factory-trimmed on-chip resistors provide.% gain accuracy while decreasing design size, cost, and layout. Three versions are available in this amplifier family: single/dual/quad open-loop, unity-gain-stable devices (MAX8/MAX8/MAX8); single/dual fixed-gain devices (MAX7/MAX7); and single/ dual devices with fixed gain plus internal / bias at the noninverting input (MAX75/MAX75). All amplifiers feature rail-to-rail outputs and drive a k Ω load while maintaining excellent DC accuracy. Open-Loop Op Amps The single/dual/quad MAX8/MAX8/MAX8 are high-performance, open-loop op amps with rail-torail outputs. These devices are compensated for unitygain stability, and feature a gain bandwidth (GBW) of MHz. The op amps in these ICs feature an input common-mode range that extends from 5mV below the negative rail to within.v of the positive rail. These high performance op amps serve as the core for this family of GainAmp fixed-gain amplifiers. Although the -db bandwidth will not correspond to that of a fixedgain amplifier in higher gain configurations, these open-loop op-amps can be used to prototype designs. Internal Gain-Setting Resistors Maxim s proprietary laser trimming techniques produce the necessary / values (Figure ), so many gain offerings are easily available. These GainAmp fixed-gain amplifiers feature a negative-feedback resistor network that is laser trimmed to provide a gain-setting feedback ratio ( / ) with.% typical accuracy. The standard op amp pinouts allow the GainAmp fixed-gain amplifiers to drop in directly to existing board designs, easily replacing op-amp-plus-resistor gain blocks. GainAmp Bandwidth GainAmp fixed-gain amplifiers feature factory-trimmed precision resistors to provide fixed inverting gains from -.5V/V to -V/V or noninverting gains from +.5V/V to +V/V. The op-amp core is decompensated strategically over the gain-set options to maximize bandwidth. Open-loop decompensation increases GBW product, ensuring that usable bandwidth is maintained with increasing closed-loop gains. A GainAmp with a fixed gain of A V = V/V has a -db bandwidth of khz. By comparison, a unity-gain-stable op amp configured for A V = V/V would yield a -db bandwidth of only khz (Figure ). Decompensation is performed at five intermediate gain sets, as shown in the Gain Selection Guide. Low gain decompensation greatly increases usable bandwidth, while decompensation above gains of +5V/V offers diminished returns. VCC / Internal Bias The MAX75/MAX75 GainAmp fixed-gain amplifiers with the / bias option are identical to standard GainAmp fixed-gain amplifiers, with the added feature of / internal bias at the noninverting inputs. Two 5kΩ resistors form a voltage-divider for self-biasing the noninverting input, eliminating external bias resistors for AC-coupled applications, and allowing maximum signal swing at the op amp s rail-to-rail output for single-supply systems (see Typical Operating Circuit ). For DC-coupled applications, use the MAX7/ MAX7. High-Voltage (±7V) Input Fault Protection The MAX7/MAX75/MAX7/MAX75 include ±7V input fault protection. For normal operation, see the input voltage range specification in the Electrical Characteristics. Overdriven inputs up to ±7V will not IN- IN+ Figure. Internal Gain-Setting Resistors GAIN (db) 6 5 -db khz khz k k k M M Figure. Gain-Bandwidth Comparison MAX8, A V = MHz GBW A V = - MAX7, A V = MHz GBW A V = + OUT MAX7/5, MAX7/5, MAX8//

12 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// cause output phase reversal. A back-to-back SCR structure at the input pins allows either input to safely swing ±7V relative to (Figure ). Additionally, the internal op-amp inputs are diode clamped to either supply rail for the protection of sensitive input stage circuitry. Current through the clamp diodes is limited by a 5kΩ resistor at the noninverting input, and by at the inverting input. An IN+ or IN- fault voltage as high as ±7V will cause less than.5ma of current to flow through the input pin, protecting both the GainAmp and the signal source from damage. Applications Information GainAmp fixed-gain amplifiers offer a precision, fixed gain amplifier in a small package that can be used in a variety of circuit board designs. GainAmp fixed-gain amplifiers can be used in many op amp circuits that use resistive negative feedback to set gain, and that do not require other connections to the op-amp inverting input. Both inverting and noninverting op-amp configurations can be implemented easily using a GainAmp. IN- IN+ 7V SCR 5k GainAmp Input Voltage Range The MAX7/MAX75/MAX7/MAX75 combine both an op amp and gain-setting feedback resistors on the same chip. Because the inverting input pin is actually tied to the input series resistor, the inverting input voltage range is different from the noninverting input voltage range. Just as with a discrete design, care must be taken not to saturate the inputs/output of the core op amp, to avoid signal distortions or clipping. The inverting inputs (IN_-) of the MAX7/MAX75/ MAX7/MAX75 must be within the supply rails or signal distortion may result. The GainAmp s inverting input structure includes diodes to both supplies, such that driving the inverting input beyond the rails may cause signal distortions (Figure ). For applications that require sensing voltages beyond the rails, use the MAX8/MAX8/MAX8 open-loop op amps (Figure ). MAX7 MAX75 MAX7 MAX75 OUT 7V SCR NOTE: INPUT STAGE PROTECTION INCLUDES TWO 7V SCRs AND TWO DIODES AT THE INPUT STAGE. BIAS RESISTORS (MAX75/MAX75 ONLY) Figure. Input Protection

13 SOT, Rail-to-Rail, Fixed-Gain V IN MAX8 V OUT = - (V IN ) Figure. Single-Supply, DC-Coupled Inverting Amplifier with Negative Input Voltage V IN MAX7 V OUT = - V IN ( ) Figure 5. Dual-Supply, DC-Coupled Inverting Amplifier.µF V IN R B R B MAX75 V OUT = - VIN ( ) Figure 6. Single-Supply, AC-Coupled Inverting Amplifier MAX7 V IN VOUT = VIN (+ ) Figure 7. Dual-Supply, AC-Coupled Noninverting Amplifier MAX7/5, MAX7/5, MAX8// GainAmp Signal Coupling and Configurations Common op-amp configurations include both noninverting and inverting amplifiers. Figures 5 8 show various single and dual-supply circuit configurations. Single-supply systems benefit from a midsupply bias on the noninverting input (provided internally on MAX75/MAX75), as this produces a quiescent DC level at the center of the rail-to-rail output stage signal swing. For dual-supply systems, ground-referenced signals may be DC-coupled into the inverting or noninverting inputs. IN_+ Filter on MAX75/MAX75 Internal resistor biasing of the / bias options couples power-supply noise directly to the op amp s noninverting input. To minimize high-frequency power-supply noise coupling, add a µf to.µf capacitor from IN+ to ground to create a lowpass filter (Figure 6). The lowpass filter resulting from the internal bias resistors and added capacitor can help eliminate higher frequency power-supply noise coupling through the noninverting input.

14 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// Supply Bypassing and Board Layout All devices in the GainAmp family operate from a +.5V to +5.5V single supply or from ±.5V to ±.75V dual supplies. For single-supply operation, bypass the power supply with a.µf capacitor to ground. For dual supplies, bypass each supply to ground. Bypass with capacitors as close to the device as possible, to minimize lead inductance and noise. A printed circuit board with a low-inductance ground plane is recommended. MAX7 V IN VOUT = VIN (+ ) Figure 8. Dual-Supply, DC-Coupled Noninverting Amplifier MAX7 Capacitive-Load Stability Driving large capacitive loads can cause instability in most low-power, rail-to-rail output amplifiers. The fixedgain amplifiers of this GainAmp family are stable with capacitive loads up to 7pF. Stability with higher capacitive loads can be improved by adding an isolation resistor in series with the op-amp output, as shown in Figure 9. This resistor improves the circuit s phase margin by isolating the load capacitor from the amplifier s output. In Figure, a pf capacitor is driven with a Ω isolation resistor exhibiting some overshoot but no oscillation. Figures and show the typical small-signal pulse responses of GainAmp fixed-gain amplifiers with 5pF and 7pF capacitive loads and no isolation resistor. A V = +5V/V 5mV/div A V = +5V/V 5mV/div INPUT Figure. Small-Signal/Large-Signal Transient Response with Excessive Capacitive Load with Isolation Resistor R ISO INPUT C L R L Figure 9. Dual-Supply, Capacitive-Load Driving Circuit

15 SOT, Rail-to-Rail, Fixed-Gain INPUT A V = +.5V/V 5mV/div A V = +V/V 5mV/div A V = +5V/V 5mV/div A V = +V/V 5mV/div A V = +5V/V 5mV/div INPUT A V = +.5V/V 5mV/div A V = +V/V 5mV/div A V = +5V/V 5mV/div A V = +V/V 5mV/div A V = +5V/V 5mV/div MAX7/5, MAX7/5, MAX8// A V = +5V/V 5mV/div A V = +5V/V 5mV/div µs/div µs/div Figure. MAX7/MAX75 Small-Signal Pulse Response (C L = 5pF, R L = kω) Figure. MAX7/MAX75 Small-Signal Pulse Response (C L = 7pF, R L = kω) 5

16 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// GAIN CODE / INVERTING GAIN + ( / ) NONINVERTING GAIN AB*.5.5 -db BW (khz) 7 MAX7 ACDS AC ACDT AD* 59 ACDU AE ACDV Gain Selection Guide TOP MARK MAX75 ACET ACEU ACEV ACEW AF ACDW ACEX AG* 97 ACDX ACEY AH ACDY ACEZ AJ 69 ACDZ ACFA AK* 5 97 ACEA ACFB AL ACEB ACFC AM ACEC ACFD AN ACED ACFE AO* 9 6 ACEE ACFF BA* 56 ACEF ACFG BB ACEG ACFH BC ACEH ACFI BD ACEI ACFJ BE* 5 59 ACEJ ACFK BF ACEK ACFL BG 5 ACEL ACFM BH 9 ACEM ACFN BJ* 9 5 ACEN ACFO BK* 5 5 ACEO ACFP BL 6 6 ACEP ACFQ BM ACEQ ACFR BN* 99 ACER ACFS CA* ACES ACFT Note: Gains in the noninverting configuration are + (RF/RG) and range from +.5V/V to +V/V. For a +V/V gain, use the MAX8/MAX8/MAX8. * Preferred Gains. These gain versions are available as samples and in small quantities. The -db bandwidth is the same for inverting and noninverting configurations. 6

17 + - SOT, Rail-to-Rail, Fixed-Gain OUT N.C. OUTB INB- INB+ TOP VIEW N.C. IN- IN+ OUTA INA- INA+ SO MAX75 R R R MAX OUT IN+ R MAX R R SOT N.C. OUTA INA- INA+ OUTA INA- INA+ INB+ 5 MAX µmax/so MAX Pin Configurations (continued) MAX8 OUT OUTA INA- INA+ OUTA INA- INA+ INB+ 5 OUTB INB- INB+ OUTD IND- IND+ INC+ 8 7 OUTB 6 5 INB- INB+ 6 OUTD 5 IND- IND+ INC+ + - µmax/so MAX IN+ IN- SOT MAX7 - MAX7/5, MAX7/5, MAX8// µmax/so INC- INB INC- INB- 6 OUTB OUTC OUTB OUTC SO/TSSOP N.C. 8 9 N.C. QSOP 7

18 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// Ordering Information (continued) PART* TEMP. RANGE PIN- PACKAGE MAX7_EUA - C to +85 C 8 µmax MAX7_ESA - C to +85 C 8 SO MAX75_EUA - C to +85 C 8 µmax MAX75_ESA - C to +85 C 8 SO MAX8EUK-T - C to +85 C 5 SOT ACDR MAX8ESA - C to +85 C 8 SO MAX8EUA - C to +85 C 8 µmax MAX8ESA - C to +85 C 8 SO MAX8EUD - C to +85 C TSSOP MAX8ESD - C to +85 C SO MAX8EEE - C to +85 C 6 QSOP Note: Refer to Gain Selection Guide for SOT top marks. *Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number. Refer to Gain Selection Guide for a list of preferred gains. PART* INVERTING GAINS AVAILABLE (V/V) (INVERTING, / ) NONINVERTING GAIN (V/V) TRANSISTOR COUNTS: MAX7: 78 MAX75: 78 MAX7: MAX75: MAX8: 78 MAX8: MAX8: 8 SUBSTRATE CONNECTED TO INTERNAL RESISTORS INTERNAL / BIAS Chip Information NO. OF AMPS PER PACKAGE Selector Guide PIN-PACKAGE MAX7_ -.5 to to + Yes No 5-pin SOT MAX75_ -.5 to to + Yes Yes 5-pin SOT MAX7_ -.5 to to + Yes No 8-pin µmax/so MAX75_ -.5 to to + Yes Yes 8-pin µmax/so MAX8_ MAX8_ MAX8_ Open Loop, Unity-Gain Stable Open Loop, Unity-Gain Stable Open Loop, Unity-Gain Stable TOP MARK No No 5-pin SOT, 8-pin SO No No 8-pin µmax/so No No * Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number. -pin SO/TSSOP, 6-pin QSOP 8

19 SOT, Rail-to-Rail, Fixed-Gain Package Information SOT5L.EPS MAX7/5, MAX7/5, MAX8// 9

20 SOT, Rail-to-Rail, Fixed-Gain MAX7/5, MAX7/5, MAX8// Package Information 8LUMAXD.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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