LMV110M7X

LMV101/102/105/110 Fixed-Gain Amplifiers August 2000 LMV101/102/105/110 Fixed-Gain Amplifiers General Description The LMV101/102/105/110 fixed-gain amplifier family integrates a rail-to-rail op amp, two internal gain-setting resistors and a V+/2 bias circuit into one ultra tiny package, SC70-5 or SOT23-5. Fixed inverting gains of −1, −2, −5, and −10 are available. The core op amp in this series 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 LMV101/102/105/110 family reduces external component count. It is the most cost effective solution for applications where low voltage operation, low power consumption, space savings, 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. Features (For 5V Supply, Typical Unless Otherwise Noted) n Fixed inverting gain available −1,−2,−5,−10 n DC gain accuracy @2.7V supply — LMV101/102/105 2% (typ) — LMV110 6% (typ) n Space saving packages SC70-5 & SOT23-5 n Industrial temperature range −40˚C to +85˚C n Low supply current 130µA n Rail-to-Rail output swing n Guaranteed 2.7V and 5V performance Applications n n n n n General purpose portable devices Mobile communications Battery powered electronics Active filters Microphone preamplifiers Typical Application Phase Inverting AC Amplifier DS101234-10 VOUT = 0.5VCC −VIN (R2/R1) © 2000 National Semiconductor Corporation DS101234 www.national.com LMV101/102/105/110 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Machine Model Human Body Model Supply Voltage (V + Storage Temperature Range Junction Temperature (TJ , max) (Note 5) -65˚C to 150˚C 150˚C Operating Ratings (Note 1) 200V 1500V 5.5V + − Supply Voltage Temperature Range Thermal resistance (θJA) 5-pin SC70-5 5-pin SOT23-5 2.7V to 5.0V −40˚C ≤ TJ ≤ 85˚C 478˚C/W 265˚C/W - V −) Output Short Circuit to V Output Short Circuit to V Mounting Temperature (Note 3) (Note 4) 235˚C Infrared or Convection (20 sec) 2.7V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 2.7V, V− = 0V, VO = V +/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol VO Parameter Output Swing Conditions RL = 10kΩ to 1.35V Typ (Note 6) V+−0.01 0.08 IS Supply Current DC Gain Accuracy LMV101, Gain = −1 LMV102, Gain = −2 LMV105, Gain = −5 LMV110, Gain = −10 GBW −3dB Bandwidth LMV101, Gain = −1, R L = 2kΩ, CL = 100pF LMV102, Gain = −2, R L = 2kΩ, CL = 100pF LMV105, Gain = −5, R L = 2kΩ, CL = 100pF LMV110, Gain = −10, R L = 2kΩ, CL = 100pF 80 2 2 2 6 1.6 1.8 0.8 0.2 Max (Note 7) V+−0.1 0.18 170 5 5 6 12 Units V min V max µA max % % % % MHz MHz MHz MHz 5V Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VO = V +/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Symbol VO Parameter Output Swing Conditions RL = 2kΩ to 2.5V Typ (Note 6) V+−0.04 0.14 RL = 10kΩ to 2.5V V+−0.01 0.1 IO Output Current Sourcing, VO = 0V Sinking, VO = 5V 60 160 Max (Note 7) V+−0.3 V+−0.4 0.3 0.4 V+−0.1 V+−0.2 0.18 0.28 5 10 Units V min V max V min V max mA min mA min www.national.com 2 LMV101/102/105/110 5V Electrical Characteristics Symbol IS Parameter Supply Current DC Gain Accuracy (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VO = V +/2 and RL > 1MΩ. Boldface limits apply at the temperature extremes. Conditions Typ (Note 6) 130 LMV101, Gain = −1 LMV102, Gain = −2 LMV105, Gain = −5 LMV110, Gain = −10 SR GBW Slew Rate −3dB Bandwidth (Note 8) LMV101, Gain = −1, R L = 2kΩ, CL = 100pF LMV102, Gain = −2, R L = 2kΩ, CL = 100pF LMV105, Gain = −5, R L = 2kΩ, CL = 100pF LMV110, Gain = −10, R L = 2kΩ, CL = 100pF Note 2: Human body model, 1.5kΩ in series with 100pF. Machine model, 0Ω in series with 100pF. 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)–T A)/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: Number specified is the slower of the positive and negative slew rates. Max (Note 7) 250 350 5 5 6 12 Units µA max % % % % V/µs MHz MHz MHz MHz 3.5 3.5 3.5 9.0 1 1.6 1.8 0.8 0.2 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. Typical Performance Characteristics 25˚C.) Supply Current vs. Supply Voltage (Unless otherwise specified, VS = +5V, single supply, TA = Sourcing Current vs. Output Voltage DS101234-22 DS101234-23 3 www.national.com LMV101/102/105/110 Typical Performance Characteristics 25˚C.) (Continued) Sourcing Current vs. Output Voltage (Unless otherwise specified, VS = +5V, single supply, TA = Sinking Current vs. Output Voltage DS101234-24 DS101234-25 Sinking Current vs. Output Voltage Output Voltage Swing vs. Supply Voltage DS101234-26 DS101234-21 LMV101 Close Loop Frequency Response LMV101 Close Loop Frequency Response DS101234-27 DS101234-28 www.national.com 4 LMV101/102/105/110 Typical Performance Characteristics 25˚C.) (Continued) LMV102 Close Loop Frequency Response (Unless otherwise specified, VS = +5V, single supply, TA = LMV102 Close Loop Frequency Response DS101234-29 DS101234-30 LMV105 Close Loop Frequency Response LMV105 Close Loop Frequency Response DS101234-31 DS101234-32 LMV110 Close Loop Frequency Response LMV110 Close Loop Frequency Response DS101234-33 DS101234-34 5 www.national.com LMV101/102/105/110 Typical Performance Characteristics 25˚C.) (Continued) Inverting Large Signal Pulse Response LMV101 (Unless otherwise specified, VS = +5V, single supply, TA = Inverting Large Signal Pulse Response LMV102 DS101234-35 DS101234-37 Inverting Large Signal Pulse Response LMV105 Inverting Large Signal Pulse Response LMV110 DS101234-39 DS101234-41 Inverting Small Signal Pulse Response LMV101 Inverting Small Signal Pulse Response LMV102 DS101234-36 DS101234-38 www.national.com 6 LMV101/102/105/110 Typical Performance Characteristics 25˚C.) (Continued) Inverting Small Signal Pulse Response LMV105 (Unless otherwise specified, VS = +5V, single supply, TA = Inverting Small Signal Pulse Response LMV110 DS101234-40 DS101234-42 Slew Rate vs. Supply Voltage DS101234-43 Application Information The LMV101/102/105/110 integrates a rail-to-rail op amp, two internal gain-setting resistors and a V+/2 bias circuit into one ultra tiny package, SC70-5 or SOT23-5. With its small footprint and reduced component count for gain stage, 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. For applications that require sensing voltages beyond the negative rail, use the LMV111 with external gain setting resistors. 7 www.national.com LMV101/102/105/110 Application Information 3.0 Capacitive Load Tolerance (Continued) larger can be used. The output can swing rail-to-rail. To avoid output distortion, the peak-to-peak amplitude of the input AC signal should be less than VCC(R 1/R2). The LMV101/102/105/110 can directly drive 200pF capacitive load with Vs = 5V at −1 gain configuration without oscillation. 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. DS101234-10 FIGURE 3. Phase Inverting AC Amplifier It is recommended that a small-valued capacitor be 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. (See Figure 4) DS101234-13 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. The bigger the Riso resistor value, the more stable VOUT will be. Figure 2 is an output waveform of Figure 1 using 100Ω for Riso and 1000pF for CL. DS101234-11 FIGURE 4. 5.0 Microphone preamplifier Most microphones have a low output voltage level. This output signal needs to be amplified so that it can feed the next stage with optimal level. Figure 5 shows a microphone preamplifier circuit with the LMV110. This microphone preamplifier can provide 20dB gain. It can be implemented in PCs, PDAs, and mobile phones. Input capacitor CIN serves two important functions. First, it blocks any DC voltage from the previous stage to prevent the output from shifting to some unwanted DC level. This could cause the output to saturate when audio signal is applied at the input. Second, the CIN and the 10k input resistor form a low pass filter to block any low frequency noise. The cut-off frequency of this low pass filter is given by, DS101234-12 FIGURE 2. Pulse Response of LMV101 in Figure 1 4.0 Phase Inverting AC Amplifier A single supply phase inverting AC amplifier can be easily built with the LMV101/102/105/110 series (Figure 3). The output voltage is biased at mid-supply, and AC input signal is amplified by (R2/R1). Capacitor CIN acts as an input AC coupling capacitor to block DC potentials. A capacitor of 0.1µF or where R1 = 10kΩ in LMV110. Output capacitor COUT is used to block the DC output from the next stage. R bias is selected according to the microphone requirement. www.national.com 8 LMV101/102/105/110 Application Information (Continued) 6.0 Adjustable-Gain Amplifier The LMV101/102/105/110 not only provides fixed gain of −1, −2, −5, and −10, it can also be configured for different gains by adding only one external resistor. You can decrease the gain by putting a resistor in series with pin 1 (Figure 7). You can increase the gain by connecting a resistor from pin 1 to pin 3 (Figure 8). DS101234-15 FIGURE 5. Microphone Preamplifier with 20dB Gain To improve power supply ripple rejection of the above microphone preamplifier, another capacitor and a pot can be connected to pin 1 as shown in Figure 6. The impedance of the two capacitors at audio frequencies are low. The RPOT can be adjusted so that the supply ripples injected through both the inverting input and the non-inverting input cancel each other at the output. If we ignore the impedance of the capacitors, we can select the pot value based on the following equation: DS101234-18 FIGURE 7. Decreased Gain ZOUT is the output impedance of the microphone, and G is the gain of the preamplifier in absolute value. DS101234-19 FIGURE 8. Increased Gain If you are using the LMV110 as a microphone preamplifier for an electret microphone (Figure 5), and the output impedance of the microphone is 1kΩ, then the gain of the preamplifier is DS101234-17 FIGURE 6. Improved Ripple Rejection If we choose a small value for R, then we could get a preamplifier with a gain close to 100 (40dB), which is 10 times the gain provided by LMV110. 9 www.national.com LMV101/102/105/110 Connection Diagrams DS101234-2 DS101234-1 5-Pin SC70-5 (M7) DS101234-3 5-Pin SOT23-5 (M5) Ordering Information Package Part number LMV101M7 LMV101M7X LMV102M7 SC70-5 LMV102M7X LMV105M7 LMV105M7X LMV110M7 LMV110M7X LMV101M5 LMV101M5X LMV102M5 SOT23-5 LMV102M5X LMV105M5 LMV105M5X LMV110M5 LMV110M5X Marking A38 A39 A40 A41 A33A A34A A35A A36A DC Gain −1 −2 −5 −10 −1 −2 −5 −10 R1 100k 100k 50k 10k 100k 100k 50k 10k R2 100k 200k 250k 100k 100k 200k 250k 100k Transport Media 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel MA05B MAA05A NSC Drawing www.national.com 10 LMV101/102/105/110 Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SC70-5 Tape and Reel Order Numbers LMV101M7, LMV101M7X, LMV102M7, LMV102M7X, LMV105M7, LMV105M7X, LMV110M7 or LMV110M7X NS Package Number MAA05A 11 www.national.com LMV101/102/105/110 Fixed-Gain Amplifiers Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT23-5 Tape and Reel Order Numbers LMV101M5, LMV101M5X, LMV102M5, LMV102M5X, LMV105M5, LMV105M5X, LMV110M5 or LMV110M5X 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. 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