What is it?

The board contains two differential output amplifiers that convert a single-ended input to a balanced output pair. These balanced audio drivers consist of high performance op amps with on chip precision resistors. They are fully specified for high performance audio applications and have excellent ac specifications, including low distortion (0.0005% at 1 kHz) and high slew rate (15 V/µs).

The on-chip resistors are laser-trimmed for accurate gain and optimum output common-mode rejection. Wide output voltage swing and high output drive capability allow use in a wide variety of demanding applications. They easily drive the large capacitive loads associated with long audio cables. Used in combination with the INA134 or INA137 differential receivers, they offer a complete solution for transmitting analog audio signals without degradation.

The board requires dual supply normally used in the audio amplifiers. The voltage must be in the limits 17V-40V for both positive and negative supplies. This board can be used for driving of long audio cables, and also for creating the input signal for power audio amplifiers working in a bridged mode. The board has two separate channels, suitable for stereo signal audio equipment.

Features:

• Balanced Output
• Low Distortion: 0.0005% at f = 1 kHz
• Wide Output Swing
• High Capacitive Load Drive
• High Slew Rate: 15 V/µs

Why did you make it?

I needed a device which can generate a high quality signal for a bridged mode power audio amplifier.

What makes it special?

This is a small board with high quality Texas Instruments chips which can be used for high quality audio signals.