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| DESCRIPTION: General Description: 996VP-LZ True Balanced I/O Dual Unbalanced Discrete Operational Amplifier This auction is for Qty(1) fully tested and assembled discrete opamp, ready to drop in and go! Model 996VP-LZ Datasheet and Specifications PDF Model 996VP-LZ Transformerless Balanced Preamp Application Note AN-19 General Description: 996VP-LZ True Balanced I/O Dual Unbalanced Discrete Amplifier The
Sonic Imagery Labs 996VP-LZ is a high performance semi-discrete
operational amplifier module designed for professional audio
applications and areas where ultra-low noise and extremely low
distortion is required. It is a higher performance drop in upgrade
replacement for the Valley People Trans-Amp LZ. Unlike the familiar
OP-AMP geometry, the Sonic Imagery Labs 996VP-LZ is inherently a fully
balanced differential in/differential output device employing
symetrically opposed feedback loops. Instead of the feedback being
returned to the input ports, as done with traditional balanced
topologies, the feedback signal is returned to a pair of feedback ports.
This results in a pair of input ports configured as a high impedance
fully balanced bridging input. For differential current summing amplifier applications, the input signals are brought to the feedback ports, which now double as balanced virtual ground current summing junctions. Where
true balanced inputs are not required, the Sonic Imagery Labs 996VP-LZ
can also be operated as two independent amplifiers, with each half
maintaining the extremely low noise, low distortion, and high gain
bandwidth performance characteristics associated with this device.  In addition to the enhanced input stage, the 996VP-LZ uses high precision temperature stable, power supply independent current sources. The original design did not use a true current source thus making its operational specifications voltage dependent for performance. Supply independent current sources allow the 996VP-LZ differential amplifiers bias to remain locked at the optimum operating point regardless of power supply voltage. Another
feature not found in the original Paul Buff/Valley People design is the
addition of a matched pair active current load to give the 996VP-LZ
differential input stage it’s outstanding power supply noise rejection
ratio performance. The output driver stage has been redesigned specifically to source and sink large amounts of current without degrading the output drivers linearity. High order harmonics produced by the output stages crossover distortion found in the original Valley People opamp design are eliminated. The new output stage provides exceptionally low open loop output impedance that improves stability with capacitive loads and is also protected against short-circuit and thermal overload events. This allows the Sonic Imagery Labs 996VP-LZ to drive transformers and balanced cabling directly and still remain stable. The newly designed output stage also provides nearly rail to rail output voltage. Output levels of +28dBu differential are easily obtainable and are not limited by gain setting dependency.
The Sonic Imagery Labs 996VP-LZ can be operated from ±5V to ±18V power supplies. The redesigned input stage circuitry provides outstanding common-mode rejection and maintains low input bias current over its wide input voltage range, minimizing distortion. The 996VP-LZ is unity-gain stable and provides excellent dynamic behavior over a wide range of load conditions. The pinouts conform to the original Valley People Trans-Amp LZ package type, allowing direct replacement. Both
the Valley People Trans-Amp LZ and the Sonic Imagery Labs 996VP-LZ is
internally AC coupled, with an effective low end open-loop bandwidth of
0.0003 Hz. This results in a closed loop 3dB point of 0.3 Hz when
operated at 60 dB gain, or 3 Hz for 80 dB gain. |
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account otherwise we ship Sonic Imagery Labs can produce a variation of this model that will provide <0.450nV/√Hz equivalent input refered noise voltage performance for ultra-ultra low noise amplifier applications. The Model 996VP-LZ UULN Variant, adds an additional 3rd low noise differential pair transistor pack to lower EIN to <0.450nV/√Hz. See Also |
