LMC6484 LMC6484 CMOS Quad Rail-to-Rail Input and Output Operational Amplifier Literature Number: SNOS675B
LMC6484 CMOS Quad Rail-to-Rail Input and Output Operational Amplifier General Description Features The LMC6484 provides a common-mode range that extends to both supply rails. This rail-to-rail performance combined with excellent accuracy, due to a high CMRR, makes it unique among rail-to-rail input amplifiers. It is ideal for systems, such as data acquisition, that require a large input signal range.
LMC6484 Absolute Maximum Ratings (Note 1) Storage Temperature Range Junction Temperature (Note 4) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Differential Input Voltage Voltage at Input/Output Pin Supply Voltage (V+ − V−) Current at Input Pin (Note 12) Current at Output Pin (Notes 3, 8) Current at Power Supply Pin Lead Temp. (Soldering, 10 sec.
(Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2 and RL > 1M. Boldface limits apply at the temperature extremes. Typ Symbol Parameter Conditions (Note 5) LMC6484AI Limit Output Swing V+ = 5V Limit Limit (Note 6) 4.8 4.8 4.8 V 4.7 4.7 4.7 min 0.18 0.18 0.18 V 0.24 0.24 0.24 max 4.5 4.5 4.5 V 4.24 4.24 4.24 min 0.5 0.5 0.5 V 0.65 0.65 0.65 max 14.7 14.4 14.4 14.4 V 14.2 14.2 14.2 min 0.16 0.32 0.
LMC6484 AC Electrical Characteristics (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, V+ = 5V, V− = 0V, VCM = VO = V+/2 and RL > 1M. Boldface limits apply at the temperature extremes. Typ Symbol T.H.D. Parameter Conditions Total Harmonic Distortion LMC6484A (Note 5) f = 1 kHz, AV = −2 LMC6484I LMC6484M Limit Limit Limit (Note 6) (Note 6) (Note 6) Units 0.01 % 0.01 % RL = 10 kΩ, VO = 4.1 VPP f = 10 kHz, AV = −2 RL = 10 kΩ, VO = 8.
(Continued) Note 2: Human body model, 1.5 kΩ in series with 100 pF. All pins rated per method 3015.6 of MIL-STD-883. This is a class 2 device rating. Note 3: Applies to both single supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150˚C. Output currents in excess of ± 30 mA over long term may adversely affect reliability.
LMC6484 Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless otherwise specified (Continued) Sinking Current vs Output Voltage Sinking Current vs Output Voltage DS011714-45 Output Voltage Swing vs Supply Voltage DS011714-46 Input Voltage Noise vs Frequency Input Voltage Noise vs Input Voltage DS011714-48 Input Voltage Noise vs Input Voltage DS011714-49 Input Voltage Noise vs Input Voltage DS011714-50 www.national.
VS = +15V, Single Supply, TA = 25˚C unless otherwise specified (Continued) Crosstalk Rejection vs Frequency Positive PSRR vs Frequency Negative PSRR vs Frequency DS011714-53 CMRR vs Frequency DS011714-54 CMRR vs Input Voltage CMRR vs Input Voltage DS011714-57 DS011714-56 ∆VOS vs CMR CMRR vs Input Voltage DS011714-55 DS011714-58 ∆ VOS vs CMR DS011714-59 DS011714-60 7 DS011714-61 www.national.
LMC6484 Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless otherwise specified (Continued) Input Voltage vs Output Voltage Input Voltage vs Output Voltage DS011714-62 Open Loop Frequency Response DS011714-63 Open Loop Frequency Response vs Temperature DS011714-65 Gain and Phase vs Capacitive Load DS011714-64 Maximum Output Swing vs Frequency DS011714-67 DS011714-66 Gain and Phase vs Capacitive Load DS011714-68 www.national.
VS = +15V, Single Supply, TA = 25˚C unless otherwise specified (Continued) Open Loop Output Impedance vs Frequency Slew Rate vs Supply Voltage Non-Inverting Large Signal Pulse Response Non-Inverting Large Signal Pulse Response Non-Inverting Large Signal Pulse Response DS011714-74 Non-Inverting Small Signal Pulse Response DS011714-73 DS011714-72 DS011714-71 Non-Inverting Small Signal Pulse Response DS011714-75 Non-Inverting Small Signal Pulse Response DS011714-77 DS011714-78 9 DS011714-76 I
LMC6484 Typical Performance Characteristics VS = +15V, Single Supply, TA = 25˚C unless otherwise specified (Continued) Inverting Large Signal Pulse Response Inverting Large Signal Pulse Response DS011714-80 Inverting Small Signal Pulse Response Inverting Small Signal Pulse Response DS011714-81 Inverting Small Signal Pulse Response DS011714-83 DS011714-82 Stability vs Capacitive Load DS011714-84 DS011714-85 Stability vs Capacitive Load Stability vs Capacitive Load Stability vs Capacitive Load
VS = +15V, Single Supply, TA = 25˚C unless otherwise specified (Continued) Stability vs Capacitive Load Stability vs Capacitive Load DS011714-89 DS011714-90 ceeding this absolute maximum rating, as in Figure 2, can cause excessive current to flow in or out of the input pins possibly affecting reliability. Application Information 1.
LMC6484 Application Information (Continued) loading reduces the phase margin of op-amps. The combination of the op-amp’s output impedance and the capacitive load induces phase lag. This results in either an underdamped pulse response or oscillation. Capacitive load compensation can be accomplished using resistive isolation as shown in Figure 4. This simple technique is useful for isolating the capacitive input of multiplexers and A/D converters. DS011714-17 DS011714-16 FIGURE 4.
LMC6484 Application Information (Continued) of the ultra-low input current of the LMC6484, typically less than 20 fA, it is essential to have an excellent layout. Fortunately, the techniques of obtaining low leakages are quite simple. First, the user must not ignore the surface leakage of the PC board, even though it may sometimes appear acceptably low, because under conditions of high humidity or dust or contamination, the surface leakage will be appreciable.
LMC6484 Application Information (Continued) 7.0 Offset Voltage Adjustment Offset voltage adjustment circuits are illustrated in Figures 13, 14. Large value resistances and potentiometers are used to reduce power consumption while providing typically ± 2.5 mV of adjustment range, referred to the input, for both configurations with VS = ± 5V. DS011714-26 FIGURE 13. Non-Inverting Configuration Offset Voltage Adjustment 8.
LMC6484 Application Information (Continued) DS011714-28 FIGURE 14. Operating from the same Supply Voltage, the LMC6484 buffers the ADC12038 maintaining excellent accuracy cations that benefit from these features include analytic medical instruments, magnetic field detectors, gas detectors, and silicon-based transducers. A small valued potentiometer is used in series with Rg to set the differential gain of the 3 op-amp instrumentation circuit in Figure 15.
LMC6484 Application Information Higher frequency and larger common-mode range applications are best facilitated by a three op-amp instrumentation amplifier. (Continued) A 2 op-amp instrumentation amplifier designed for a gain of 100 is shown in Figure 16. Low sensitivity trimming is made for offset voltage, CMRR and gain. Low cost and low power consumption are the main advantages of this two op-amp circuit. DS011714-30 FIGURE 16. Low-Power Two-Op-Amp Instrumentation Amplifier 11.
LMC6484 Typical Single-Supply Applications (Continued) DS011714-34 FIGURE 20. Full Wave Rectifier Waveform DS011714-35 FIGURE 21. Large Compliance Range Current Source DS011714-36 FIGURE 22. Positive Supply Current Sense 17 www.national.
LMC6484 Typical Single-Supply Applications (Continued) DS011714-37 FIGURE 23. Low Voltage Peak Detector with Rail-to-Rail Peak Capture Range In Figure 23 dielectric absorption and leakage is minimized by using a polystyrene or polyethylene hold capacitor. The droop rate is primarily determined by the value of CH and diode leakage current. The ultra-low input current of the LMC6484 has a negligible effect on droop. DS011714-38 FIGURE 24.
LMC6484 Connection Diagram DS011714-4 Ordering Information Package Temperature Range Military Industrial −55˚C to +125˚C −40˚C to +85˚C 14-pin LMC6484AIN Molded DIP Transport Media N14A Rail M14A Rail LMC6484IN 14-pin LMC6484AIM, AIMX Small Outline 14-pin Ceramic DIP NSC Drawing LMC6484IM, IMX LMC6484AMJ/883 Tape and Reel J14A 19 Rail www.national.
LMC6484 Physical Dimensions inches (millimeters) unless otherwise noted 14-Pin Ceramic Dual-In-Line Package Order Number LMC6484AMJ/883 NS Package Number J14A www.national.
LMC6484 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Pin Small Outline Order Package Number LMC6484AIM, LMC6484AIMX, LMC6484IM or LMC6484IMX NS Package Number M14A 21 www.national.
LMC6484 CMOS Quad Rail-to-Rail Input and Output Operational Amplifier Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 14-Pin Molded DIP Order Package Number LMC6484AIN, LMC6484IN or LMC6484MN NS Package Number N14A 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.
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