LMC7101 A12A. Features. General Description. Applications. Ordering Information. Pin Configuration. Functional Configuration.

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1 LMC7 LMC7 Low-Power Operational Amplifier Final Information General Description The LMC7 is a high-performance, low-power, operational amplifier which is pin-for-pin compatible with the National Semiconductor LMC7. It features rail-to-rail input and output performance in Micrel s IttyBitty SOT-23-5 package. The LMC7 is a 5kHz gain bandwidth amplifier designed to operate from 2.7V to 2V single-ended power supplies with guaranteed performance at supply voltages of 2.7V, 3V, 5V, and 2V. This op amp s input common-mode range includes ground and extends 3mV beyond the supply rails. For example, the common-mode range is.3v to +5.3V with a 5V supply. Features Small footprint SOT-23-5 package Guaranteed 2.7V, 3V, 5V, and 2V performance 5kHz gain-bandwidth.% total harmonic distortion at khz (5V, 2kΩ).5mA typical supply current at 5V Applications Mobile communications, cellular phones, pagers Battery-powered instrumentation PCMCIA, USB Portable computers and PDAs Ordering Information Standard Pb-Free Part Number Marking Part Number Marking* Grade Temp Range Package LMC7AIM5 A2A LMC7AYM5 A2A Prime 4 C to +85 C SOT-23-5 LMC7BIM5 A2 LMC7BYM5 A2 Standard 4 C to +85 C SOT-23-5 *Under bar symbol (_) may not be to scale. Pin Configuration Functional Configuration IN+ OUT 3 2 A2A Part Identification IN+ 3 2 OUT 4 5 IN V 4 5 IN V SOT-23-5 (M5) Pin Description Pin Number Pin Name Pin Function OUT Amplifier Output 2 Positive Supply 3 IN+ Noninverting Input 4 IN Inverting Input 5 V Negative Supply: Negative supply for split supply application or ground for single supply application. 28 Fortune Drive San Jose, CA 953 USA tel + (48) fax + (48) February 25 LMC7

2 LMC7 Absolute Maximum Ratings (Note ) Supply Voltage (V V V )... 5V Differential Input Voltage (V IN+ V IN )... ±(V V V ) I/O Pin Voltage (V IN, ), Note 2... V +.3V to V V.3V Junction Temperature (T J ) C Storage Temperature C to +5 C Lead Temperature (soldering, sec.) C ESD, Note kV Operating Ratings (Note ) Supply Voltage (V V V ) V to 2V Ambient Temperature (T A )... 4 C to +85 C Junction Temperature (T J )... 4 C to +25 C Max. Junction Temperature (T J(max) ), Note C Package Thermal Resistance (θ JA ), Note C/W Max. Power Dissipation... Note 3 Electrical Characteristics (2.7V) = +2.7V, V = V, V CM = = /2; R L = MΩ; T J = 25 C, bold values indicate 4 C T J +85 C; unless noted LMC7A LMC7B V OS Input Offset Voltage. 6 9 mv TCV OS Input Offset Voltage Average Drift. µv/ C I B Input Bias Current pa I OS Input Offset Current pa R IN Input Resistance > TΩ CMRR Common-Mode Rejection Ratio V V CM 2.7V, Note db V CM Input Common-Mode Voltage input low, CMRR 5dB.3.. V input high, CMRR 5dB V PSRR Power Supply Rejection Ratio =.35V to.65v, V = db.35v to.65v, V CM = C IN Common-Mode Input Capacitance 3 pf V O Output Swing output high, R L = k V output low, R L = k..6.6 V output high, R L = 2k V output low, R L = 2k.8.. V I S Supply Current = / ma ma SR Slew Rate.4 V/µs GBW Gain-Bandwidth Product.5 MHz Electrical Characteristics (3.V) = +3.V, V = V, V CM = = /2; R L = MΩ; T J = 25 C, bold values indicate 4 C T J +85 C; unless noted LMC7A LMC7B V OS Input Offset Voltage. 4 7 mv 6 9 mv TCV OS Input Offset Voltage Average Drift. µv/ C I B Input Bias Current pa I OS Input Offset Current pa R IN Input Resistance > TΩ LMC7 2 February 25

3 LMC7 LMC7A LMC7B CMRR Common-Mode Rejection Ratio V V CM 3.V, Note db V CM Input Common-Mode Voltage input low, CMRR 5dB.3 V input high, CMRR 5dB V PSRR Power Supply Rejection Ratio =.5V to 6.V, V = db.5v to 6.V, V CM = C IN Common-Mode Input Capacitance 3 pf Output Swing output high, R L = 2k V output low, R L = 2k.8.. V output high, R L = 6Ω V output low, R L = 6Ω V I S Supply Current ma ma Electrical Characteristics DC (5V) = +5.V, V = V, V CM =.5V, = /2; R L = MΩ; T J = 25 C, bold values indicate 4 C T J +85 C; unless noted LMC7A LMC7B V OS Input Offset Voltage. 3 7 mv 5 9 mv TCV OS Input Offset Voltage Average Drift. µv/ C I B Input Bias Current pa I OS Input Offset Current pa R IN Input Resistance > TΩ CMRR Common-Mode Rejection Ratio V V CM 5V, Note db db V CM Input Common-Mode Voltage input low, CMRR 5dB V.. V input high, CMRR 5dB V V +PSRR Positive Power Supply = 5V to 2V, db Rejection Ratio V = V, =.5V db PSRR Negative Power Supply = V, V = 5V to 2V, db Rejection Ratio =.5V db C IN Common-Mode Input Capacitance 3 pf Output Swing output high, R L = 2k V V output low, R L = 2k... V.5.5 V output high, R L = 6Ω V V output low, R L = 6Ω.37.. V.2.2 V I SC Output Short Circuit Current sourcing ( = V) or ma Note 7 sinking ( = 5V) 8 8 ma I S Supply Current = / ma.. ma February 25 3 LMC7

4 LMC7 Electrical Characteristics DC (2V) = +2V, V = V, V CM =.5V, = /2; R L = MΩ; T J = 25 C, bold values indicate 4 C T J +85 C; unless noted LMC7A LMC7B V OS Input Offset Voltage. 6 9 mv TCV OS Input Offset Voltage Average Drift. µv/ C I B Input Bias Current pa I OS Input Offset Current pa R IN Input Resistance > TΩ CMRR Common-Mode Rejection Ratio V V CM 2V, Note db 6 6 db V CM Input Common-Mode Voltage input low, = 2V, V CMRR 5dB.. V input high, = 2V, V CMRR 5dB V +PSRR Positive Power Supply = 5V to 2V, db Rejection Ratio V = V, =.5V db PSRR Negative Power Supply = V, V = 5V to db Rejection Ratio 2V, =.5V db A V Large Signal Voltage Gain sourcing or sinking, V/mV R L = 2k, Note V/mV sourcing or sinking, V/mV R L = 6Ω, Note 9 V/mV C IN Common-Mode Input Capacitance 3 pf Output Swing output high, = 2V, V R L = 2k V output low, = 2V,.2.. V R L = 2k,.3.3 V output high, = 2V, V R L = 6Ω V output low, = 2V, V R L = 6Ω V I SC Output Short Circuit Current sourcing ( = V) or ma sinking ( = 2V), 2 2 ma Notes 7, 8 I S Supply Current = / ma.7.7 ma LMC7 4 February 25

5 LMC7 Electrical Characteristics AC (5V) = 5V, V = V, V CM =.5V, = /2; R L = MΩ; T J = 25 C, bold values indicate 4 C T J +85 C; unless noted LMC7A LMC7B THD Total Harmonic Distortion f = khz, A V = 2,. % R L = 2kΩ, = 4. V PP SR Slew Rate.3 V/µs GBW Gain-Bandwidth Product.5 MHz Electrical Characteristics AC (2V) = 2V, V = V, V CM =.5V, = /2; R L = MΩ; T J = 25 C, bold values indicate 4 C T J +85 C; unless noted LMC7A LMC7B THD Total Harmonic Distortion f = khz, A V = 2,. % R L = 2k, = 8.5 V PP SR Slew Rate = 2V, Note V/µs.5.5 V/µs GBW Gain-Bandwidth Product.5 MHz φ m Phase Margin 45 G m Gain Margin db e n Input-Referred Voltage Noise f = khz, V CM = V 37 nv/ Hz i n Input-Referred Current Noise f = khz.5 fa/ Hz General Notes: Devices are ESD protected; however, handling precautions are recommended. All limits guaranteed by testing on statistical analysis. Note. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside its recommended operating ratings. Note 2. I/O Pin Voltage is any external voltage to which an input or output is referenced. Note 3. The maximum allowable power dissipation is a function of the maximum junction temperature, T J(max) ; the junction-to-ambient thermal resistance, θ JA ; and the ambient temperature, T A. The maximum allowable power dissipation at any ambient temperature is calculated using: P D = (T J(max) T A ) θ JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature. Note 4. Thermal resistance, θ JA, applies to a part soldered on a printed-circuit board. Note 5. Human body model,.5k in series with pf. Note 6. Common-mode performance tends to follow the typical value. Minimum value limits reflect performance only near the supply rails. Note 7. Continuous short circuit may exceed absolute maximum T J under some conditions. Note 8. Shorting OUT to when > 2V may damage the device. Note 9. R L connected to 5.V. Sourcing: 5V 2V. Sinking: 2.5V 5V. Note. Device connected as a voltage follower with a 2V step input. The value is the positive or negative slew rate, whichever is slower. February 25 5 LMC7

6 LMC7 Typical Characteristics Supply Current vs. Supply Voltage Input Current vs. Junction Temperature PSRR vs. Frequency SUPPLY CURRENT (µa) C 25 C 85 C INPUT CURRENT (pa) -PSRR (db) V 2V 2.7V SUPPLY VOLTAGE (V) JUNCTION TEMPERATURE ( C) -2 x x 2 x 3 x 4 x 5 +PSRR (db) V +PSRR vs. Frequency 2.7V 5V x x 2 x 3 x 4 x 5 CMRR (db) CMRR vs. Frequency 5V 2V 2.7V x x 2 x 3 x 4 x 5 CURRENT SINK / SOURCE (ma). Sink / Source Currents vs. Output Voltage.... OUTPUT VOLTAGE (V) SLEW RATE (V/µs) Falling Slew Rate vs. vs. Supply Voltage -4 C +25 C +85 C SUPPLY VOLTAGE (V) SLEW RATE (V/µs) Rising Slew Rate vs. vs. Supply Voltage -4 C +25 C +85 C SUPPLY VOLTAGE (V) OFFSET VOLTAGE (µv) C Offset Voltage vs. Supply Voltage 85 C -4 C SUPPLY VOLTAGE (V) Phase Margin vs. Capacitive Load PHASE MARGIN ( ) 8 2V 5V 6 3V 4 2.7V 2 A V = LOAD CAPACITANCE (pf) LMC7 6 February 25

7 LMC7 2.7V Open-Loop Frequency Response 8 5V Open-Loop Frequency Response 8 2V Open-Loop Frequency Response GAIN (db) 8 R L = M 6 4 R L = 2k 2 x 2 x 3 x 4 x 5 GAIN (db) MΩ 2k 6Ω x 2 x 3 x 4 x 5 GAIN (db) 6 M 4 2k 2 6Ω x 2 x 3 x 4 x 5 GAIN (db) V Open-Loop Gain and Phase R L = MΩ pf ( ) 5pF ( ) pf (db) x 2 x 3 x 4 x 5 x 6 5pF (db) PHASE ( ) OFFSET VOLTAGE (µv) V Open-Loop Gain and Phase R L = MΩ pf ( ) 5pF ( ) pf ( ) pf (db) 5pF (db) -3 pf (db) -2-6 x 2 x 3 x 4 x 5 x 6 COMMON-MODE VOLTAGE (V) PHASE ( ) GAIN (db) V Open-Loop Gain and Phase R L = MΩ pf ( ) 5pF ( ) pf ( ) pf (db) 5pF (db) -3 pf (db) -2-6 x 2 x 3 x 4 x 5 x 6 PHASE ( ) February 25 7 LMC7

8 LMC7 Functional Characteristics Inverting Small-Signal Pulse Response Inverting Large-Signal Pulse Response OUTPUT INPUT OUTPUT INPUT Noninverting Small-Signal Pulse Response Noninverting Large-Signal Pulse Response OUTPUT INPUT OUTPUT INPUT Input Voltage Noise vs. Frequency LMC7 8 February 25

9 LMC7 Application Information Input Common-Mode Voltage Some amplifiers exhibit undesirable or unpredictable performance when the inputs are driven beyond the common-mode voltage range, for example, phase inversion of the output signal. The LMC7 tolerates input overdrive by at least 2mV beyond either rail without producing phase inversion. If the absolute maximum input voltage (7mV beyond either rail) is exceeded, the input current should be limited to ±5mA maximum to prevent reducing reliability. A kω series input resistor, used as a current limiter, will protect the input structure from voltages as large as 5V above the supply or below ground. See Figure. V IN R IN kω Figure. Input Current-Limit Protection Output Voltage Swing Sink and source output resistances of the LMC7 are equal. Maximum output voltage swing is determined by the load and the approximate output resistance. The output resistance is: R OUT = V I DROP LOAD V DROP is the voltage dropped within the amplifier output stage. V DROP and I LOAD can be determined from the V O (output swing) portion of the appropriate Electrical Characteristics table. I LOAD is equal to the typical output high voltage minus /2 and divided by R LOAD. For example, using the Electrical Characteristics DC (5V) table, the typical output high voltage using a 2kΩ load (connected to /2) is 4.989V, which produces an I LOAD of V 2. 5V. 245mA =. 245mA. 2kΩ Voltage drop in the amplifier output stage is: V DROP = 5.V 4.989V V DROP =.V Because of output stage symmetry, the corresponding typical output low voltage (.V) also equals V DROP. Then: V R OUT =. 9 A = Ω Driving Capacitive Loads Driving a capacitive load introduces phase-lag into the output signal, and this in turn reduces op-amp system phase margin. The application that is least forgiving of reduced phase margin is a unity gain amplifier. The LMC7 can typically drive a pf capacitive load connected directly to the output when configured as a unity-gain amplifier. Using Large-Value Feedback Resistors A large-value feedback resistor (> 5kΩ) can reduce the phase margin of a system. This occurs when the feedback resistor acts in conjunction with input capacitance to create phase lag in the fedback signal. Input capacitance is usually a combination of input circuit components and other parasitic capacitance, such as amplifier input capacitance and stray printed circuit board capacitance. Figure 2 illustrates a method of compensating phase lag caused by using a large-value feedback resistor. Feedback capacitor C FB introduces sufficient phase lead to overcome the phase lag caused by feedback resistor R FB and input capacitance C IN. The value of C FB is determined by first estimating C IN and then applying the following formula: R IN C IN R FB CFB V IN R IN C IN C FB R FB Figure 2. Cancelling Feedback Phase Lag Since a significant percentage of C IN may be caused by board layout, it is important to note that the correct value of C FB may change when changing from a breadboard to the final circuit layout. February 25 9 LMC7

10 LMC7 Typical Circuits Some single-supply, rail-to-rail applications for which the LMC7 is well suited are shown in the circuit diagrams of Figures 3 through 7. V S.5V to Q V CEO(sus) Load V to 3 2 V IN V to A V 4 5 LMC7 V to V IN V to 2V LMC7 I OUT Q 2N394 V CEO = 4V { I C(max) = 2mA R2 9k R k Figure 3a. Noninverting Amplifier (V) R2 A V = + R V IN (V) Change Q and R S for higher current and/or different gain. V IOUT = IN = RS R S Ω 2W ma/v as shown Figure 5. Voltage-Controlled Current Sink C.µF 4 3 R4 k 2 5 LMC7 V Figure 3b. Noninverting Amplifier Behavior R2 k R4 k R3 k V IN V to LMC7 V to = V IN Figure 4. Voltage Follower C IN Figure 6. Square Wave Oscillator R 33k R2 33k LMC7 C OUT R L V R3 33k R4 33k C µf R2 33k A V = R = 33k = Figure 7. AC-Coupled Inverting Amplifier LMC7 February 25

11 LMC7 Package Information.9 (.75) REF.95 (.37) REF.75 (.69).5 (.59) 3. (.8) 2.6 (.2) 3.2 (.9) 2.8 (.).3 (.5).9 (.35) DIMENSIONS: MM (INCH).2 (.8).9 (.4).5 (.2).35 (.4).5 (.6). (.).6 (.24). (.4) SOT-23-5 (M5) February 25 LMC7

12 LMC7 MICREL INC. 28 FORTUNE DRIVE SAN JOSE, CA 953 USA TEL + (48) FAX + (48) 474- WEB This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. 999 Micrel Incorporated LMC7 2 February 25

13 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Micrel: LMC7BYM5 TR Microchip: LMC7AYM5-TR LMC7BYM5-TR

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