LMV111 Operational Amplifier with Bias Network General Description Features The LMV111 integrates a rail-to-rail op amp with a V+/2 bias circuit into one ultra tiny package, SC70-5 or SOT23-5. The core op amp of the LMV111 is an LMV321, which provides rail-to-rail output swing, excellent speed-power ratio, 1MHz bandwidth, and 1V/µs of slew rate with low supply current. The LMV111 reduces external component count. It is a cost effective solution for applications where low voltage operation, low power consumption, space saving, and reliable performance are needed. It enables the design of small portable electronic devices, and allows the designer to place the device closer to the signal source to reduce noise pickup and increase signal integrity. (For 5V Supply, Typical Unless Otherwise Noted) n Resistor ratio matching 1% (typ) n Space saving package SC70-5 & SOT23-5 n Industrial temp. range −40˚C to +85˚C n Low supply current 130µA n Gain-bandwidth product 1MHz n Rail-to-Rail output swing n Guaranteed 2.7V and 5V performance Applications n n n n n General purpose portable devices Active filters Mobile communications Battery powered electronics Microphone preamplifiers Connection Diagrams DS101262-21 © 1999 National Semiconductor Corporation DS101262 www.national.com LMV111 Operational Amplifier with Bias Network December 1999 LMV111 Connection Diagrams (Continued) 5-Pin SC70-5 (M7) 5-Pin SOT23-5 (M5) DS101262-19 Top View DS101262-20 Top View Ordering Information Package SC70-5 SOT23-5 www.national.com Part Number LMV111M7 LMV111M7X LMV111M5 LMV111M5X Marking Transport Media 1k Units Tape and Reel A42 3k Units Tape and Reel 1k Units Tape and Reel A37A 3k Units Tape and Reel 2 NSC Drawing MAA05A MA05B Junction Temp. (TJ max) (Note 5) Mounting Temperature 150˚C Infrared or Convection (20 sec) 235˚C Operating Ratings (Note 1) ESD Tolerance (Note 2) Machine Model 200V Human Body Model Supply Voltage 1500V Supply Voltage (V+–V −) 2.7V to 5.0V −40˚C ≤ TJ ≤ 85˚C Temperature Range 5.5V Thermal Resistance (θJA) Output Short Circuit to V + (Note 3) 5-pin SC70-5 478˚C/W Output Short Circuit to V − (Note 4) 5-pin SOT23-5 265˚C/W Storage Temp. Range −65˚C to 150˚C 2.7V Electrical Characteristics Unless otherwise specified, all limits guaranteed for T its apply at the temperature extremes. Symbol VO J = 25˚C, V+ = 2.7V, V− = 0V, VO = V+/2 and RL > 1 MΩ. Boldface limConditions Typ (Note 6) Limit (Note 7) RL = 10kΩ to 1.35V V+ −0.01 V+ −0.1 V min 0.06 0.18 V max 80 170 µA max Parameter Output Swing IS Supply Current GBWP Gain-Bandwidth Product Φm Gm Units 1 % 1 MHz Phase Margin 60 Deg Gain Margin 10 dB Resistor Ratio Matching CL = 200pF 5V Electrical Characteristics Unless otherwise specified, all limits guaranteed for T apply at the temperature extremes. Symbol VO J = 25˚C, V+ = 5V, V− = 0V, VO = V+/2 and RL > 1 MΩ. Boldface limits Parameter Output Swing Conditions Output Current IS Supply Current GBWP Gain-Bandwidth Product φm Gm SR Slew Rate + Limit (Note 7) + Units V −0.04 V −0.3 V+ −0.4 V min 0.12 0.3 0.4 V max V+ −0.01 V+ −0.1 V+ −0.2 V min 0.065 0.18 0.28 V max Sourcing, VO = OV 60 5 mA min Sinking, VO = 5V 160 10 mA min 130 250 350 µA max RL = 2kΩ to 2.5V RL = 10kΩ to 2.5V IO Typ (Note 6) 1 % 1 MHz Phase Margin 60 Deg Gain Margin 10 dB 1 V/µs Resistor Ratio Matching CL = 200pF (Note 8) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Note 2: Human body model, 1.5kΩ in series with 100pF. Machine model, 0Ω in series with 100pF. 3 www.national.com LMV111 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LMV111 5V Electrical Characteristics (Continued) Note 3: Shorting circuit output to V+ will adversely affect reliability. Note 4: Shorting circuit output to V - will adversely affect reliability. Note 5: The maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is P D = (TJ(max)–TA)/θJA. All numbers apply for packages soldered directly into a PC board. Note 6: Typical values represent the most likely parametric norm. Note 7: All limits are guaranteed by testing or statistical analysis. Note 8: Connected as voltage follower with 3V step input. Number specified is the slower of the positive and negative slew rates. Typical Performance Characteristics (Unless otherwise specified, VS = +5V, single supply, TA = 25˚C.) Supply Current vs. Supply Voltage Sourcing Current vs. Output Voltage DS101262-1 Sinking Current vs. Output Voltage DS101262-2 Sinking Current vs. Output Voltage DS101262-4 Open Loop Frequency vs. Response DS101262-3 Open Loop Frequency vs. Response DS101262-5 Open Loop Frequency Response vs. Temperature DS101262-7 www.national.com Sourcing Current vs. Output Voltage Gain and Phase vs. Capacitive Load DS101262-8 4 DS101262-6 DS101262-9 (Unless otherwise specified, VS = +5V, single supply, TA = Gain and Phase vs. Capacitive Load Slew Rate vs. Supply Voltage Non-Inverting Large Signal Pulse Response DS101262-11 DS101262-10 Non-Inverting Small Signal Pulse Response Inverting Large Signal Pulse Response DS101262-13 Open Loop Output Impedance vs. Frequency DS101262-12 Inverting Small Signal Pulse Response DS101262-14 Short Circuit Current vs. Temperature (Sinking) DS101262-15 Short Circuit Current vs. Temperature (Sourcing) DS101262-16 DS101262-17 5 DS101262-18 www.national.com LMV111 Typical Performance Characteristics 25˚C.) (Continued) LMV111 Typical Performance Characteristics (Unless otherwise specified, VS = +5V, single supply, TA = 25˚C.) (Continued) Output Voltage Swing vs. Supply Voltage DS101262-22 Application Section The LMV111 integrates a rail-to-rail op amp and a V +/2 bias circuit into one ultra tiny package. With its small footprint and reduced component count for bias network, it enables the design of smaller portable electronic products, such as cellular phones, pagers, PDAs, PCMCIA cards, etc. In addition, the integration solution minimizes printed circuit board stray capacitance, and reduces the complexity of circuit design. The core op amp of this family is National’s LMV321. 1.0 Supply Bypassing The application circuits in this datasheet do not show the power supply connections and the associated bypass capacitors for simplification. When the circuits are built, it is always required to have bypass capacitors. Ceramic disc capacitors (0.1µF) or solid tantalum (1µF) with short leads, and located close to the IC are usually necessary to prevent interstage coupling through the power supply internal impedance. Inadequate bypassing will manifest itself by a low frequency oscillation or by high frequency instabilities. Sometimes, a 10µF (or larger) capacitor is used to absorb low frequency variations and a smaller 0.1µF disc is paralleled across it to prevent any high frequency feedback through the power supply lines. 2.0 Input Voltage Range The input voltage should be within the supply rails. The ESD protection circuitry at the input of the device includes a diode between the input pin and the negative supply pin. Driving the input more than 0.6V (at 25˚C) beyond the negative supply will turn on the diode and cause signal distortions. DS101262-23 FIGURE 1. Resistive Isolation of a Heavy Capacitive Load The isolation resistor Riso and the CL form a pole to increase stability by adding more phase margin to the overall system. The desired performance depends on the value of Riso. A 50Ω to 100Ω isolation resistor is recommended for initial evaluation. The bigger the Riso resistor value, the more stable VOUT will be. 3.0 Capacitive Load Tolerance The LMV111 can directly drive 200pF capacitive load with unity gain without oscillation. The unity-gain follower is the most sensitive configuration to capacitive loading. Direct capacitive loading reduces the phase margin of amplifiers. The combination of the amplifier’s output impedance and the capacitive load induces phase lag. This results in either an underdamped pulse or oscillation. To drive a heavier capacitive load, a resistive isolation can be used as shown in Figure 1. www.national.com 6 LMV111 Application Section (Continued) 4.0 Phase Inverting AC Amplifier A single supply phase inverting AC amplifier is shown in Figure 2. The output voltage is biased at mid-supply, and AC input signal is amplified by (R2/R 1). Capacitor CIN acts as an input AC coupling capacitor to block DC potentials. A capacitor of 0.1µF or larger can be used. The output of the LMV111 can swing rail-to-rail. To avoid output distortion, the peak-to-peak amplitude of the input AC signal should be less than VCC(R1/R2). It is recommended that a small-valued capacitor is used across the feedback resistor R2 to eliminate stability problems, prevent peaking of the response, and limit the bandwidth of the circuit. This can also help to reduce high frequency noise and some other interference. DS101262-25 FIGURE 3. Fixed Current Source 6.0 Difference Amplifier The difference amplifier allows the subtraction of two voltages or, as a special case, the cancellation of a signal common to two inputs. It is useful as a computational amplifier, in making a differential to single-ended conversion or in rejecting a common mode signal. DS101262-24 FIGURE 2. Phase Inverting AC Amplifier 5.0 Fixed Current Source A multiple fixed current source is show in Figure 3. A reference voltage (VREF = 2.5V) is established across resistor R3 by the voltage divider (R 3 and R4). Negative feedback is used to cause the voltage drop across R1 to be equal to VREF. This controls the emitter current of transistor Q1 and if we neglect the base current of Q1 and Q2, essentially this same current is available out of the collector of Q1. A Darlington connection can be used to reduce errors due to the bias current of Q1. DS101262-26 FIGURE 4. Difference Amplifier 7 www.national.com LMV111 Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SC70-5 Tape and Reel Order Numbers LMV111M7 and LMV111M7X NS Package Number MAA05A www.national.com 8 LMV111 Operational Amplifier with Bias Network Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 5-Pin SOT23-5 Tape and Reel Order Numbers LMV111M5 and LMV111M5X NS Package Number MA05B LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 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