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John Hardy Company 990C+
Discrete Op Amp

OUR PART #:  990C

The 990C discrete op-amp is amongst the finest op-amps available for audio applications. If you want superior sound quality, the 990 can provide it.
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Our Price: $46.57
List Price: $49.95
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John Hardy Company 990C+
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The 990C discrete op-amp is amongst the finest op-amps available for audio applications. If you want superior sound quality, the 990 can provide it. The 990 is used in the most critical audio applications. Leading recording studios, remote recording companies, disc and CD/DVD mastering facilities, and TV and radio stations use the 990 for superior performance. Several mic preamp products using the 990 are available from The John Hardy Company.  

Product Update:   In January of 2013, manufacturing of the 990 was converted from through-hole assembly to surface-mount assembly. Many improvements in components were made. The basic circuit and package dimensions remain the same, but the name has been modified to "990C+" to signify the changes. See technical information sheet for details.

Specifications (990C  0dBu = 0.775V):

  • Open-loop gain, DC to 30Hz:   125 dB
  • Gain error at 100dB gain:   0.4 dB
  • Noise-voltage spectral density:
    -  each transistor:  0.8 nV/vHz
    -  differential pair:   1.13 nV/vHz
  • Noise current spectral density:   1 pA/vHz
  • Noise index:   1kOhm source resistance:   0.6 dB
  • Equivalent input noise voltage:
    -  20kHz bandwidth, shortedinput:   160 nV
    -  Corresponding voltage level:  -133.7 dBu
  • Maximum input voltage at unity gain: 13.8 V
    -  Correspondingvoltage level: +25 dBu
  • Input impedance, non-inverting input: >10 M Ohms
  • Input bias current: +2.2 µA
  • Maximum output voltage:
    -  RL = 75Ohm 13.8 V
    - Corresponding voltage level: +25 dBu
  • Maximum peak output current: 260 mA
  • Total harmonic distortion at 20kHz:
    -  VOUT = +24dBu
    -  RL=75Ohm, gain = 40dB:   0.06 %
    -  RL =75Ohm, gain =20dB:   0.005 %
    -  RL =600Ohm, gain = 40dB:  0.015 %
  • Slew rate, RL = 150Ohm:   18 V/µS
  • Slew rate, RL = 75Ohm:   16 V/µS
  • Large-signal bandwidth:
    -  RL = 150Ohm:   145 kHz
  • Small-signal bandwidth:
    -  at unity gain (ft):   10 MHz
  • Gain-bandwidth product:
    -  10kHz to 100kHz:   >50 MHz
  • Phase margin at 10MHz:   >38 deg
  • Phase margin at <2MHz:   >60 deg
  • Response time at unity gain:   <20 nS
  • Supply current with no load: 25 mA

   

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