|Category||Analog & Mixed-Signal Processing => Amplifiers => Operational Amplifiers|
|Description||Ultralow Distortion Ultralow Noise op Amp|
|Datasheet||Download AD797A datasheet
FEATURES Low Noise 0.9 nV/Hz typ (1.2 nV/ Hz max) Input Voltage Noise at 1 kHz 50 nV p-p Input Voltage Noise, 10 Hz Low Distortion 120 dB Total Harmonic Distortion at 20 kHz Excellent AC Characteristics 800 ns Settling Time to 16 Bits (10 V Step) 110 MHz Gain Bandwidth 1000) 8 MHz Bandwidth 10) 280 kHz Full Power Bandwidth 20 V p-p V/ s Slew Rate Excellent DC Precision 80 V max Input Offset Voltage V/ C VOS Drift Specified for 5 V and 15 V Power Supplies High Output Drive Current 50 mA APPLICATIONS Professional Audio Preamplifiers IR, CCD, and Sonar Imaging Systems Spectrum Analyzers Ultrasound Preamplifiers Seismic Detectors ADC/DAC Buffers PRODUCT DESCRIPTIONCONNECTION DIAGRAM 8-Pin Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages
DECOMPENSATION & DISTORTION NEUTRALIZATION +VS OUTPUT OFFSET NULL
necessary for preamps in microphones and mixing consoles. Furthermore, the AD797's excellent slew rate of 20 V/µs and 110 MHz gain bandwidth make it highly suitable for low frequency ultrasound applications. The AD797 is also useful in IR and Sonar Imaging applications where the widest dynamic range is necessary. The low distortion and 16-bit settling time of the AD797 make it ideal for buffering the inputs to ADCs or the outputs of high resolution DACs especially when they are used in critical applications such as seismic detection and spectrum analyzers. Key features such 50 mA output current drive and the specified power supply voltage range ± 15 volts make the AD797 an excellent general purpose amplifier.
The is a very low noise, low distortion operational amplifier ideal for use as a preamplifier. The low noise of 0.9 nV/ Hz and low total harmonic distortion dB at audio bandwidths give the AD797 the wide dynamic range
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Offset Voltage Drift INPUT BIAS CURRENT TMIN to TMAX INPUT OFFSET CURRENT TMIN to TMAX OPEN-LOOP GAIN VOUT 10 V RLOAD 2 k TMIN to TMAX RLOAD = 600 TMIN to TMAX 20 V p-p, RLOAD 1 k RLOAD 10 V Step VCM = CMVR TMIN to TMAX 18 V TMIN to TMAX = 1 kHz 10 Hz1 MHz = 1 kHz
DYNAMIC PERFORMANCE Gain Bandwidth Product 3 dB Bandwidth Full Power Bandwidth3 Slew Rate Settling Time to 0.0015% COMMON-MODE REJECTION POWER SUPPLY REJECTION INPUT VOLTAGE NOISEINPUT CURRENT NOISE INPUT COMMON-MODE VOLTAGE RANGE OUTPUT VOLTAGE SWING
Short-Circuit Current Output Current4 TOTAL HARMONIC DISTORTION RLOAD = 250 kHz, 3 V rms RLOAD 20 kHz, 3 V rms
INPUT CHARACTERISTICS Input Resistance (Differential) Input Resistance (Common Mode) Input Capacitance (Differential)5 Input Capacitance (Common Mode) OUTPUT RESISTANCE POWER SUPPLY Operating Range Quiescent Current = 1 kHz ±5
NOTES 1 See standard military drawing for 883B specifications. 2 Specified using external decompensation capacitor, see Applications section. 3 Full Power Bandwidth = Slew Rate/2 VPEAK. 4 Output Current for S VOUT| k. 5 Differential input capacitance consists 1.5 pF package capacitance and 18.5 pF from the input differential pair. Specifications subject to change without notice.
Supply Voltage. 18 V Internal Power Dissipation @ +25°C2 Input Voltage. ± VS Differential Input 0.7 V Output Short Circuit Duration. Indefinite Within max Internal Power Dissipation Storage Temperature Range (Cerdip). to +150°C Storage Temperature Range (N, R Suffix). to +125°C Operating Temperature Range to +125°C Lead Temperature Range (Soldering 60 sec). +300°C
NOTES 1 Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 Internal Power Dissipation: 8-Pin SOIC = 0.9 Watts A25°C)/JA 8-Pin Plastic DIP and Cerdip = 1.3 Watts (T A25°C)/JA Thermal Characteristics 8-Pin Plastic DIP Package: 95°C/W 8-Pin Cerdip Package: 110°C/W 8-Pin Small Outline Package: = 155°C/W
The AD797's inputs are protected by back-to-back diodes. To achieve low noise, internal current limiting resistors are not incorporated into the design of this amplifier. If the differential input voltage exceeds 0.7 V, the input current should be limited to less than mA by series protection resistors. Note, however, that this will degrade the low noise performance of the device.
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 volts, which readily accumulate on the human body and on test equipment, can discharge without detection. Although the AD797 features proprietary ESD protection circuitry, permanent damage may still occur on these devices if they are subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid any performance degradation or loss of functionality.
Model AD797AR-REEL7 5962-9313301MPA Temperature Range to +125°C Package Description 8-Pin Plastic DIP 8-Pin Plastic DIP 8-Pin Plastic SOIC 8-Pin Plastic SOIC 8-Pin Plastic SOIC 8-Pin Plastic SOIC 8-Pin Plastic SOIC 8-Pin Plastic SOIC 8-Pin Cerdip Package Option SO-8 Q-8Contact factory for latest dimensions. Dimensions shown in inches and (mm).
NOTE The AD797 has double layer metal. Only one layer is shown here for clarity.
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