2779AT, 2779B, 277A Selling Leads, Datasheet
MFG:TSSOP-8 Package Cooled:TSSOP-8 D/C:07+
2779AT, 2779B, 277A Datasheet download
Part Number: 2779AT
MFG: TSSOP-8
Package Cooled: TSSOP-8
D/C: 07+
2779AT, 2779B, 277A
- Table of contents:
Info of 2779AT
Info of 2779B
Info of 277A
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About 277.6105.0001
PDF/DataSheet Download
Datasheet: 277.6105.0001
File Size: 107482 KB
Manufacturer: LITTELFUSE [Littelfuse]
Download : Click here to Download
About 277.6105.0001
PDF/DataSheet Download
Datasheet: 277.6105.0001
File Size: 107482 KB
Manufacturer: LITTELFUSE [Littelfuse]
Download : Click here to Download
About 277A
PDF/DataSheet Download
Datasheet: 277A
File Size: 68781 KB
Manufacturer: ETC [ETC]
Download : Click here to Download
277A General Description
Model 277 is a versatile isolation amplifier which combines a highperformance, uncommitted operational amplifier front end with a precision, isolated output stage and a floating power supply section. This configuration, shown in Figure 1, makes the 277 ideally suited to instrumentation applications where the need for various forms of signal conditioning, high CMV protection and isolated transducer power requirements are encountered.
The input stage is a low drift (±1V/ max, model 277K) differential op amp that may be connected for use in inverting, non-inverting and differential configurations. The circuitry employed around the operational amplifier input stage can be designed by the user to suit each application's particular signal processing needs. A full ±10V signal range is available at the output of the front-end amplifier.
The isolated output stage includes a special modulator/demodulator technique which provides the 277 with l60dB minimum DC common mode rejection between input and output common and an input-tooutput CMV rating of 3500V rms. When combined with the output stage's low nonlinearity (0.05%, models 277J/A and 0.025% model 277K), these high CMR and CMV ratings facilitate accurate measurements in the presence of noisy electrical equipment such as
motors and relays. In addition, model 277A offers a -25 to +85 rated operating temperature range. All versions of model 277 have a ±10 volt output range.
The floating power supply section provides isolated ±15 volt outputs capable of delivering currents up to ±15mA. This feature permits model 277 to power transducers and auxiliary isolated circuitry, thereby eliminating the need for a separate isolated DC/DC converter.
All of the features of the model 277 isolation amplifier are packaged in a compact (3" x 2.2" x 0.59") module. As an assurance of high performance reliability, every model 277 is factory tested for CMV rating by application of 3500V rms (±4900V peak) between input and output common terminals for one minute (meets NEMA and CSA requirements for 660Vrms service.) In addition, the 277 has a calculated MTBF of 133,000 hours.
277A Features
Versatile Op Amp Front End: Inverting, Non-Inverting, Differential Applications
Low Nonlinearity: 0.025% max, Model 277K
Low Input Offset Voltage Drift: 1V/°C max, Model 277K
Floating Power Output: ±15V @ ±15mA
High CMR: 160dB min @ dc
High CMV: 3500V rms
Low Nonlinearity: 0.025% max, Model 277K
Low Input Offset Voltage Drift: 1V/°C max, Model 277K
Floating Power Output: ±15V @ ±15mA
High CMR: 160dB min @ dc
High CMV: 3500V rms
277A Typical Application
Programmable Gain Isolated Amplifier
Isolated Power Source and Amplifier for Bridge
Measurements Instrumentation Amplifier
Instrumentation Grade Process Signal Isolator
Current Shunt Measurements
Isolated Power Source and Amplifier for Bridge
Measurements Instrumentation Amplifier
Instrumentation Grade Process Signal Isolator
Current Shunt Measurements
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