Harman Kardon AVR7000 Service Manual

Also see for AVR 7000: Owner's manual Brochure Test report Owner's manual Specifications

Contents

REV. AInformation furnished by Analog Devices is believed to be accurate andreliable. However, no responsibility is assumed by Analog Devices for itsuse, nor for any infringements of patents or other rights of third partieswhich may result from its use. No license is granted by implication orotherwise under any patent or patent rights of Analog Devices.a Dual Bipolar/JFET, AudioOperational AmplifierOP275*PIN CONNECTIONS8-Lead Narrow-Body SO 8-Lead Epoxy DIP(S Suffix) (P Suffix)OP275OUT A–IN A+IN AV–OUT B–IN B+IN BV+1234 5678 12348765OP275OUT B–IN B+IN BV+OUT A–IN A+IN AV–Improved dc performance is also provided with bias and offsetcurrents greatly reduced over purely bipolar designs. Input off-set voltage is guaranteed at 1 mV and is typically less than200 μV. This allows the OP275 to be used in many dc coupledor summing applications without the need for special selectionsor the added noise of additional offset adjustment circuitry.The output is capable of driving 600 Ω loads to 10 V rms whilemaintaining low distortion. THD + Noise at 3 V rms is a low0.0006%.The OP275 is specified over the extended industrial (–40°C to+85°C) temperature range. OP275s are available in both plasticDIP and SOIC-8 packages. SOIC-8 packages are available in2500 piece reels. Many audio amplifiers are not offered inSOIC-8 surface mount packages for a variety of reasons; how-ever, the OP275 was designed so that it would offer full perfor-mance in surface mount packaging.GENERAL DESCRIPTIONThe OP275 is the first amplifier to feature the Butler Amplifierfront-end. This new front-end design combines both bipolarand JFET transistors to attain amplifiers with the accuracy andlow noise performance of bipolar transistors, and the speed andsound quality of JFETs. Total Harmonic Distortion plus Noiseequals that of previous audio amplifiers, but at much lower sup-ply currents.A very low l/f corner of below 6 Hz maintains a flat noise densityresponse. Whether noise is measured at either 30 Hz or 1 kHz,it is only 6 nV/√Hz. The JFET portion of the input stage givesthe OP275 its high slew rates to keep distortion low, even whenlarge output swings are required, and the 22 V/μs slew rate ofthe OP275 is the fastest of any standard audio amplifier. Best ofall, this low noise and high speed are accomplished using lessthan 5 mA of supply current, lower than any standard audioamplifier.*Protected by U.S. Patent No. 5,101,126.© Analog Devices, Inc., 1995One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.Tel: 617/329-4700 Fax: 617/326-8703FEATURESExcellent Sonic CharacteristicsLow Noise: 6 nV/√HzLow Distortion: 0.0006%High Slew Rate: 22 V/msWide Bandwidth: 9 MHzLow Supply Current: 5 mALow Offset Voltage: 1 mVLow Offset Current: 2 nAUnity Gain StableSOIC-8 PackageAPPLICATIONSHigh Performance AudioActive FiltersFast AmplifiersIntegratorsAVR7000 harman/kardon96