Push the TDA1543 to 192kHz

[Eric Juaneda]

After the great 24 bit NOS DAC Jundac Two, I present the Jundac Three, a 16bit non-oversampling digital to analog converter using Philips TDA1543; it can operate from 32kHz to 192kHz. The I/V stage uses discrete, solid state technology, in an open loop (feedback-free) configuration. It integrates one input: S/PDIF or AES/EBU, an optional external clock (synchronous or asynchronous) for very low jitter operation and stereo fixed analog output.

A non oversampling DAC don't use any digital filter. Data coming from CD are directly converted to analog; there is no coloratura introduced by digital filtering, noise shaping or dithering. Before output, the signal is smoothed by a sweet first order low pass filter. To reach best listening quality, it can be coupled to an external low jitter clock.

High speed ICs are of the 74LV family with symmetrical output impedance and balanced propagation delay. To minimize reflection, all digital lines are loaded and PCB is 75 ohm compliant. To minimize noise in power supply, critical capacitors are Wima FKP2 polypropylene film and foil. Analog section uses SCR polypropylene capacitors and Elna Silmic II electrolytic capacitor.
Power supplies in a DAC are critical to the overall design. The Jundac Three uses six very low noise separate regulators. These power supplies use polypropylene capacitors and two separated power transformers.

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FEATURES
• TDA1543 DAC CHIP,
• ONE DIGITAL INPUT S/PDIF, AES3,
• DIGITAL TRANSFORMER INPUT,
• RCA, BNC or XLR input connector,
• ACCEPT 16, 18, 20, 24 BIT,
• 16 BIT RESOLUTION,
• 32K TO 192KHz,
• NO OVERSAMPLING, no digital filter,
• OPTIONAL CLOCK INPUT: synchronous or asynchronous to minimize jitter,
• INCLUDE CS8416 DIR RECEIVER with digital de-emphasis,
• DAC chip TDA1543
• LOW NOISE REGULATORS, LT1763, LT3080,
• BOARD SIZE: 109mm X 130mm

You can find a complete technical description on my web site and more pictures about this kit.

Hope you share this experience with us.