Halcyon DAC

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System Layout

DARxr

• Digital Audio Receiver: Crystal Semiconductor CS8413/4
• AES/EBU & S/PDIF inputs to 96kHz/24bit
• Low-Jitter On Chip clock recovery

ASRC

• Asynchronous Sample Rate Converter: Analog Devices AD1896
• Input/Output rate ratios from 7.75:1 to 1:8
• 142dB SNR and Dynamic Range, -133dB THD+N
• Master/Slave Modes for separate input and output clocks with 64 sample FIFO buffer

DIF

• 8X Over-sampling Digital Interpolation Filter: Texas Instruments DF1704
• -115dB Stop-band attenuation with 0.00005dB ripple
• Companion DIF for the PCM1704 DAC

XO

• Oven Controlled Crystal Oscillator
• Contained 24.5760MHz high accuracy oscillator
• Oven Control guarantees extreme clock fidelity and very low jitter

uC

• Micro-controller
• Controls the operation of the digital logic and power systems
• Could be replaced with functional discrete or FPGA logic

iso

• Signal Isolator
• Provides current loop isolation between Digital and Analog Ground and Power planes

DAC

• 24-Bit, 96kHz BiCMOS Sign-Magnitude Digital-to-Analog Converter: Texas Instruments PCM1704
• K-grade 112dB typ Dynamic Range
• 120dB SNR with 0.0008% THD+N
• Fast current output: +/-1.2mA/200ns
• Dual 23bit R-2R laser trimmed resistor ladders with offset circuit eliminate Bipolar crossover distortion

I/V

• Current to Voltage Converter
• Resistor based for low distortion

LPF

• -6dB/octave low pass filter
• Removes high frequency sampling components of the D/A conversion processes before amplification

AMP

• Low Distortion, High quality amplifier for driving output

Power

• Isolated Digital and Analog Power Sections
• Low noise by isolation eliminating power spikes in analog section
• Separate local linear regulators for left and right sections for supression of crosstalk
• Always on power to OCXO and digital section for automatic on