Home Tags Posts tagged with "LME49724"
Tag:

LME49724

H-DACObsolete

Addon H-PreAmp – Preamplifier/headphone amplifier addon for H-DAC

by nihtila
written by nihtila
  • Very high performance preamplifier; measurement results with H-DAC and 2 Vrms output:
    • Dynamic range / SNR: 116 dB (A-weighted)
    • THD+N ratio: -102 dB (2.0 Vrms / 1 kHz, 48 kHz sample rate)
    • Crosstalk at 10 kHz: -113 dB
  • Very high performance headphone amplifier
    • Dynamic range / SNR: 115 dB (A-weighted)
    • Maximum output power / THD+N ratio:
      • 22 mW / -98 dB into 560 ohms
      • 230 mW / -85 dB into 33 ohms
      • More gain can be added for higher output power
  • Software controlled (Arduino compatible)
  • Balanced outputs (XLR) on-board and unbalanced connectors (RCA) on H-DAC board
  • Takes supplies and audio signals directly from H-DAC via pinheaders
  • 10×10 cm 4-layer PCB shaped to fit tall components on H-DAC board; PGA4311 volume control, LM49724 and LM4562 opamps (or any with the same pinouts), TPA6120A2 headphone amplifier, optional THAT1606 balanced drivers

H-PreAmp is an addon board for H-DAC, transforming the fixed-output DAC into a very high quality preamplifier with integrated headphone amplifier. H-DAC and H-PreAmp together provide single-ended (RCA) and balanced (XLR) outputs as well as headphone amplifier.

Continue Reading
2 comments
FacebookTwitterRedditEmail
H-DACObsolete

Addon BalOut – Balanced output addon for H-DAC

by nihtila
written by nihtila
  • Very high performance; does not become bottleneck of H-DAC system
    • Noise level: -117 dBV (A-weighted)
    • THD+N ratio at 2 Vrms output signal: better than 109 dB
    • Crosstalk at 10 kHz: 113 dB
  • Balanced output buffer with low-pass filter
  • Optional high-CMRR balanced drivers
  • Takes power and audio signals directly from H-DAC
  • 5×4 cm 4-layer PCB, LM49724 opamps (or any with the same pinout), optional THAT1606 balanced drivers

Addon BalOut is a small addon board to be stacked on H-DAC to add balanced XLR outputs. It works along with the unbalanced RCA outputs on H-DAC and audio performance is high enough not to be the limiting factor of the H-DAC system.

Continue Reading
0 comment
FacebookTwitterRedditEmail
Audio Measurements

LME49724 vs. OPA1632 in Addon BalOut

by nihtila
written by nihtila

Following performance figures have been measured in Addon BalOut module:

  • Both opamps are so good that it is difficult to measure differences directly.
  • LME49724:
    • Noise level: -117 dBV (A-weighted),
    • THD+N ratio: at least -109 dB (1 kHz, 2 Vrms), around measurement instrument limits.
  • OPA1632:
    • Noise level: -118 dBV (A-weighted),
    • THD+N level: at least -109 dB (1 kHz, 2 Vrms), around measurement instrument limits.
Continue Reading
0 comment
FacebookTwitterRedditEmail