OP279 Analog Devices, OP279 Datasheet
OP279
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OP279 Summary of contents
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... Very good audio performance can be attained when using the OP179/OP279 in 5 volt systems. THD is below 0.01% with a load, and noise is a respectable 21 nV/ Hz. Supply current 600 is less than 3.5 mA per amplifier. The single OP179 is available in the 5-lead SOT-23-5 package specified over the industrial (– +85 C) tempera- ture range ...
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... AUDIO PERFORMANCE Total Harmonic Distortion Voltage Noise Density ELECTRICAL SPECIFICATIONS Parameter INPUT CHARACTERISTICS Offset Voltage OP179 OP279 Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High ...
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... V Output Short-Circuit Duration to GND . . . . . . . . . . Indefinite Storage Temperature Range S, RT, RU Package . . . . . . . . . . . . . . . . . . – +150 C Operating Temperature Range OP179G/OP279G . . . . . . . . . . . . . . . . . . . . – +85 C Junction Temperature Range S, RT, RU Package . . . . . . . . . . . . . . . . . . . – +150 C Lead Temperature Range (Soldering, 60 sec 300 C Package ...
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... Performance Characteristics OP179/OP279 160 140 A 620 OP AMPS 120 100 –2.5 –1.5 –0.5 0.5 1.5 2.5 INPUT OFFSET – 2.0 1.5 1.0 0 COMMON-MODE VOLTAGE – Volts 1000 800 V 15V 600 S 0.3 V 4.7V OUT 400 200 0 –50 – 100 TEMPERATURE – C ...
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... FREQUENCY – 2. +100 VCL +10 VCL VCL 0 –10 –20 –30 1k 10k 100k 1M 10M 100M FREQUENCY – Hz OP179/OP279 120 270 V 2.5V S 100 T –40 C 225 180 80 C 500pF L GAIN 135 PHASE –45 –20 –40 –90 100 1k 10k 100k 1M 10M FREQUENCY – Hz ...
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... Q1 IN The key issue here is the behavior of the input bias currents in this stage. The input bias currents of the OP179/OP279 over the range of common-mode voltages from (V or GND), the (V – are the arithmetic sum of the base currents in Q1-Q5 NEG POS and Q9-Q6. Outside of this range, the input bias currents are ...
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... This input current is not inherently damaging to the device as long limited less. For the OP179/OP279, once the input voltage exceeds the supply by more than 0.6 V, the input current quickly exceeds 5 mA. If this condition continues to exist, an external series resistor should be added ...
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... Next good starting point. This value is reduced to the smallest value for acceptable performance (typically, 1 F). For the case load capacitor on the OP179/OP279, the optimal snubber network series with 1 F. The benefit is immediately apparent as seen in the scope photo in Figure 6. ...
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... The low dropout performance of this circuit is provided by stage U2, one-half of an OP179/OP279 connected as a follower/buffer for the basic reference voltage produced by U1. The low voltage saturation characteristic of the OP179/OP279 allows load current in the illustrated use 3.3 V converter with high dc accuracy. In fact, the dc output voltage change for load current delta measures less than 1 mV. This corresponds to an equivalent output impedance of < ...
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... A3 1/2 OP279 A Single-Supply, Remote Strain Gage Signal Conditioner The circuit in Figure 11 illustrates a way by which the OP179/ OP279 can be used single supply, 350 signal conditioning circuit. In this circuit, the OP179/OP279 serves two functions: (1) By servoing the output of the REF43’s 2.5 V output across R1, it provides drive to the 350 strain gage. In this way, small changes in the strain gage pro- duce large differential output voltages across the AMP04’ ...
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... UNITY-GAIN, SALLEN-KEY (VCVS) FILTERS High Pass Configurations Figure 14a is the HP form of a unity-gain 2-pole SK filter using an OP179/OP279 section. For this filter and its LP coun- terpart, the gain in the passband is inherently unity, and the signal phase is noninverting due to the follower hookup. For simplicity and practicality, capacitors C1-C2 are set equal, and resistors R2-R1 are adjusted to a ratio “ ...
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... High Pass Configurations Figure 15 shows an HP MFB 2-pole filter using an OP179/ OP279 section. For this filter, the gain in the pass band is user configurable, and the signal phase is inverting. The circuit uses one more tuning component than the SK types. For simplicity, capacitors C1 and C3 are set to equal standard values, and resis- tors R1-R2 are selected as per the relationships noted ...
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... Band-pass Configurations The MFB band-pass filter using an OP179/OP279 section is shown in Figure 17. This filter provides reasonably stable medium Q designs for frequencies few kHz. For best pre- dictability and stability, operation should be restricted to applications where the OP179/OP279 has an open-loop gain 2 in excess the filter center frequency ...
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... OP179/OP279 The crossover example frequency of 500 Hz can be shifted lower or higher by frequency scaling of either resistors or capacitors. In configuring the circuit for other frequencies, complementary LP/ HP action must be maintained between sections, and component values within the sections must be in the same ratio. Table II provides a design aid to adaptation, with suggested standard component values for other frequencies ...
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... OP179/OP279 Spice Macro Model OP179/OP279 SPICE Macro Model ARG / ADI Copyright 1994 by Analog Devices Refer to “README.DOC” file for License Statement. Use of this model indicates your acceptance of the terms and pro- visions in the License Statement. Node assignments noninverting input | inverting input ...
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... OP179/OP279 8-Lead TSSOP (RU-8) 0.122 (3.10) 0.114 (2.90 PIN 1 0.0256 (0.65) 0.006 (0.15) BSC 0.002 (0.05) 0.0433 (1.10) MAX 0.0118 (0.30) SEATING 0.0079 (0.20) 0.0075 (0.19) PLANE 0.0035 (0.090) 0.0709 (1.800) 0.0590 (1.500) 0.0512 (1.300) 0.0354 (0.900) Revision History Location Data Sheet changed from REV REV. G. ...