LPC662 LPC662 Low Power CMOS Dual Operational Amplifier Literature Number: SNOS555B
LPC662 Low Power CMOS Dual Operational Amplifier General Description The LPC662 CMOS Dual operational amplifier is ideal for operation from a single supply. It features a wide range of operating voltage from +5V to +15V, rail-to-rail output swing in addition to an input common-mode range that includes ground. Performance limitations that have plagued CMOS amplifiers in the past are not a problem with this design.
LPC662 Absolute Maximum Ratings (Note 3) Current at Power Supply Pin Voltage at Input/Output Pin If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Operating Ratings (Note 3) ± Supply Voltage Differential Input Voltage Supply Voltage (V+ − V−) Output Short Circuit to V+ Output Short Circuit to V− Lead Temperature (Soldering, 10 sec.) Storage Temp.
(Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C. Boldface limits apply at the temperature extremes. V+ = 5V, V− = 0V, VCM = 1.5V, VO = 2.5V and RL > 1M unless otherwise specified. LPC662AM Parameter Conditions Typ LPC662AI LPC662I LPC662AMJ/883 Limit Limit Limit (Note 4) (Note 4) Units 4.970 4.940 V min (Notes 4, 8) Output Swing V+ = 5V 4.987 4.970 4.950 4.950 4.910 0.004 0.030 0.030 0.060 V 0.050 0.050 0.090 max 4.940 4.850 4.850 4.750 V 4.
LPC662 AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C. Boldface limits apply at the temperature extremes. V+ = 5V, V− = 0V, VCM = 1.5V, VO = 2.5V and RL > 1M unless otherwise specified. Parameter Conditions Typ LPC662AM LPC662AI LPC662I LPC662AMJ/883 Limit Limit Limit (Note 4) (Note 4) Units (Notes 4, 8) Slew Rate (Note 6) 0.11 Gain-Bandwidth Product 0.07 0.07 0.05 V/µs 0.04 0.05 0.03 min 0.
VS = ± 7.5V, TA = 25˚C unless otherwise specified Supply Current vs Supply Voltage Input Bias Current vs Temperature DS010548-28 Input Common-Mode Voltage Range vs Temperature LPC662 Typical Performance Characteristics DS010548-29 Output Characteristics Current Sinking DS010548-30 Output Characteristics Current Sourcing DS010548-31 Input Voltage Noise vs Frequency DS010548-32 DS010548-33 5 www.national.
LPC662 Typical Performance Characteristics VS = ± 7.5V, TA = 25˚C unless otherwise specified (Continued) Crosstalk Rejection vs Frequency CMRR vs Frequency DS010548-35 DS010548-34 CMRR vs Temperature Open-Loop Voltage Gain vs Temperature DS010548-36 DS010548-38 Open-Loop Frequency Response Gain and Phase Responses vs Load Capacitance DS010548-39 DS010548-40 www.national.
VS = ± 7.5V, TA = 25˚C unless otherwise specified (Continued) Gain and Phase Responses vs Temperature Gain Error (VOSvs VOUT) DS010548-41 Non-Inverting Slew Rate vs Temperature DS010548-42 Inverting Slew Rate vs Temperature DS010548-43 Large-Signal Pulse Non-Inverting Response (AV = +1) DS010548-44 Non-Inverting Small Signal Pulse Response (AV = +1) DS010548-45 DS010548-46 7 www.national.
LPC662 Typical Performance Characteristics VS = ± 7.5V, TA = 25˚C unless otherwise specified (Continued) Inverting Large-Signal Pulse Response Inverting Small-Signal Pulse Response DS010548-47 DS010548-48 Power Supply Rejection Ratio vs Frequency DS010548-37 Stability vs Capacitive Load Stability vs Capacitive Load DS010548-4 DS010548-5 Note: Avoid resistive loads of less than 500Ω, as they may cause instability. www.national.
tolerated without oscillation. Note that in all cases, the output will ring heavily when the load capacitance is near the threshold for oscillation. AMPLIFIER TOPOLOGY The topology chosen for the LPC662 is unconventional (compared to general-purpose op amps) in that the traditional unity-gain buffer output stage is not used; instead, the output is taken directly from the output of the integrator, to allow rail-to-rail output swing.
LPC662 Application Hints performance. See Figure 5a, Figure 5b, Figure 5c for typical connections of guard rings for standard op-amp configurations. If both inputs are active and at high impedance, the guard can be tied to ground and still provide some protection; see Figure 5d. (Continued) This would cause a 100 times degradation from the LPC662’s actual performance. However, if a guard ring is held within 5 mV of the inputs, then even a resistance of 1011 ohms would cause only 0.
LPC662 Application Hints (Continued) board at all, but bend it up in the air and use only air as an insulator. Air is an excellent insulator. In this case you may have to forego some of the advantages of PC board construction, but the advantages are sometimes well worth the effort of using point-to-point up-in-the-air wiring. See Figure 6. DS010548-25 FIGURE 7.
LPC662 Typical Single-Supply Applications (V+ = 5.0 VDC) (Continued) Low-Leakage Sample-and-Hold DS010548-8 Instrumentation Amplifier DS010548-9 For good CMRR over temperature, low drift resistors should be used. Matching of R3 to R6 and R4 to R7 affects CMRR. Gain may be adjusted through R2. CMRR may be adjusted through R7. www.national.
LPC662 Typical Single-Supply Applications (V+ = 5.0 VDC) (Continued) Sine-Wave Oscillator DS010548-10 Oscillator frequency is determined by R1, R2, C1, and C2: fOSC = 1/2πRC where R = R1 = R2 and C = C1 = C2. This circuit, as shown, oscillates at 2.0 kHz with a peak-to-peak output swing of 4.5V 1 Hz Square-Wave Oscillator Power Amplifier DS010548-12 DS010548-11 13 www.national.
LPC662 Typical Single-Supply Applications (V+ = 5.0 VDC) (Continued) 10 Hz Bandpass Filter 10 Hz High-Pass Filter (2 dB Dip) DS010548-14 DS010548-13 fO = 10 Hz Q = 2.1 Gain = −8.8 fc = 10 Hz d = 0.895 Gain = 1 1 Hz Low-Pass Filter (Maximally Flat, Dual Supply Only) High Gain Amplifier with Offset Voltage Reduction DS010548-15 DS010548-16 Gain = −46.8 Output offset voltage reduced to the level of the input offset voltage of the bottom amplifier (typically 1 mV), referred to VBIAS. www.national.
LPC662 Connection Diagram 8-Pin DIP/SO DS010548-1 Top View Ordering Information Package Temperature Range Military 8-Pin Industrial LPC662AMD NSC Drawing Transport Media D08C Rail Side Brazed Ceramic DIP 8-Pin LPC662AIM Small Outline or LPC662IM 8-Pin LPC662AIN Molded DIP or LPC662IN 8-Pin LPC662AMJ/883 M08A Rail Tape and Reel N08E Rail J08A Rail Ceramic DIP 15 www.national.
LPC662 Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin Cavity Dual-In-Line Package (D) Order Number LPC662AMD NS Package Number D08C Ceramic Dual-In-Line Package (J) Order Number LPC662AMJ/883 NS Package Number J08A www.national.
LPC662 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Pin Small Outline Molded Package (M) Order Number LPC662AIM or LPC662IM NS Package Number M08A 8-Pin Molded Dual-In-Line Package (N) Order Number LPC662AIN or LPC662IN NS Package Number N08E 17 www.national.
LPC662 Low Power CMOS Dual Operational Amplifier Notes 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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