Isolated, retimed USB with an optional AES/EBU output path.
A USB conditioning stage built around high-speed USB isolation, regenerated USB handoff, and a precision OCXO clock reference, available with USB output or an AES/EBU output option for systems that want AES after reclocking.
The USB Reclocker is built around three stages: high-speed USB isolation, regenerated downstream USB handoff, and a precision 24.0 MHz OCXO reference. The downstream DAC receives a locally regenerated output instead of a direct cable path from a noisy computer, streamer, or server.
The AES/EBU output is a configuration choice on the USB Reclocker, not a separate standalone product in the catalog. Use USB output when your DAC's USB input is the right boundary. Choose the AES/EBU output option when you want the reclocker to create the balanced handoff before an AES-first DAC path.
| Feature | Details |
|---|---|
| USB isolation | Uses a high-speed USB isolation stage for low, full, and high-speed USB 2.0 across a reinforced digital isolation barrier. |
| High-speed retiming | The isolation stage redrives and retimes high-speed USB data before the regenerated handoff. |
| USB regeneration stage | The regenerated USB stage creates the downstream USB connection used by the audio device. |
| Strong isolation barrier | The isolation barrier brings 5700 Vrms rating, 8.7 mm creepage and clearance, and low typical barrier capacitance into the product. |
| Noise and surge resilience | The isolation device adds strong common-mode transient immunity and IEC 61000-4-2 ESD behavior across the barrier. |
| precision oscillator supplier OCXO reclocking reference | Uses the DOCSC022F 24.0 MHz OCXO as the local reference for the USB regeneration stage. |
| Optional AES/EBU output stage | Adds a balanced AES handoff when the system should leave the reclocker over AES instead of USB. |
| Spec | Value | System relevance |
|---|---|---|
| Clock device | precision oscillator supplier DOCSC022F | A high-stability OCXO reference anchors the local USB regeneration stage. |
| Clock frequency | 24.0 MHz | Sets the local timing reference for the USB regeneration stage. |
| Oscillator type | DOCSC Series OCXO with SC-cut crystal | An oven-stabilized crystal oscillator is selected for tight frequency stability and low aging. |
| Output format | 3.3 V LVCMOS | Matches the digital clock signaling needed by the local reclocking circuitry. |
| Frequency stability option | +/-20 ppb | The local USB reference is held to a stability class well beyond commodity oscillator behavior. |
| Phase jitter | 0.25 ps RMS nominal / 0.35 ps RMS max, 12 kHz to 5 MHz bandwidth | Low jitter gives the USB hub and retiming stage a cleaner timing foundation for the regenerated link. |
| Published 24.576 MHz phase noise | -70 dBC/Hz at 1 Hz, -96 at 10 Hz, -125 at 100 Hz, -145 at 1 kHz, -151 at 10 kHz, -154 at 100 kHz, -155 at 1 MHz | The datasheet's nearest DOCSC reference column shows the low phase-noise behavior expected from this oscillator family. |
| Supply voltage | 3.13 V to 3.47 V, 3.30 V nominal | The clock is supplied from local regulation rather than computer USB bus power. |
| Duty cycle | 45% to 55% at 50% of Vcc | The clock waveform is controlled at the local timing stage. |
| Rise/fall time | 6.5 ns max, 10% to 90% | Defines the edge behavior of the LVCMOS clock output feeding the local timing stage. |
| Warm-up time | 60 s at 25 C; 90 s at -40 C | OCXO performance stabilizes after warm-up, which is normal for oven-controlled clocks. |
| Power consumption | 2.5 W turn-on / 1.1 W steady-state at 0 C to 70 C; 3.0 W / 1.3 W at -40 C to 85 C | Shows the clock is an active precision reference with its own thermal operating behavior. |
| Spec | Value | System relevance |
|---|---|---|
| Primary USB hub controller | USB regeneration stage two-port USB 3.0 hub | The TI hub stage creates the regenerated downstream USB connection. |
| USB isolation device | High-speed USB 2.0 digital isolation stage | This barrier breaks the direct electrical path from source to DAC side. |
| USB 3.0 support | SuperSpeed USB hub architecture, up to 5 Gbps device capability | The product remains compatible with modern USB hosts while the downstream connection is audio focused. |
| USB 2.0 data rates | Low speed 1.5 Mbps, full speed 12 Mbps, high speed 480 Mbps | Covers the USB 2.0 modes commonly involved in USB audio links. |
| USB placement | Between streamer, server, or computer and USB DAC, or configured with AES output | Conditioning is placed at the USB link that commonly carries source noise into the audio device. |
| Downstream role | Regenerated USB handoff or optional AES/EBU output | The DAC sees either the local regenerated USB connection or the configured AES output path. |
| Spec | Value | System relevance |
|---|---|---|
| Standard output | Regenerated USB audio | Keeps the system in USB when the DAC's USB input is the desired boundary. |
| Optional output | AES/EBU | Converts the regenerated USB handoff into a balanced AES output for AES-first DAC systems. |
| Configuration role | USB reclocker with AES output option | The AES stage is an option on the reclocker, not a separate standalone product. |
| Spec | Value | System relevance |
|---|---|---|
| Rated dielectric isolation | 5700 Vrms for 1 minute | Shows the isolation barrier is specified far beyond normal USB voltage levels. |
| Working insulation voltage | 600 Vrms / 849 V peak | Indicates the reinforced isolation rating for continuous operating conditions. |
| Transient isolation voltage | 8000 V peak | Improves resilience against short-duration voltage events between source and DAC side. |
| Surge isolation voltage | 12800 V peak | Adds margin against high-energy events crossing into the audio component. |
| Creepage and clearance | 8.7 mm minimum | Physical spacing supports a stronger isolation barrier between source and audio-side domains. |
| PCB clearance | 8.1 mm minimum | Maintains meaningful separation between the noisy upstream USB side and the regenerated output side. |
| Barrier capacitance | 2.2 pF typical | Lower capacitance reduces high-frequency noise coupling across the isolation barrier. |
| Barrier resistance | 10^12 ohm typical | Very high resistance limits DC leakage between the two USB domains. |
| Comparative tracking index | >600 V, Material Group I | Reflects the insulation material class used for the isolation package. |
| Common-mode transient immunity | 50 kV/us typical | Helps the USB link stay stable when fast common-mode noise appears across the barrier. |
| ESD rating across barrier | +/-8000 V IEC 61000-4-2 | Protects the isolated link from static discharge events during real-world handling. |
| Spec | Value | System relevance |
|---|---|---|
| High-speed propagation delay | Low propagation delay through the USB isolation stage | The isolation stage preserves predictable high-speed USB timing behavior. |
| High-speed rise/fall time | 675 ps typical | Fast edges help preserve a clean USB eye pattern at the receiver. |
| High-speed differential jitter | 40 ps rms / 90 ps peak, next-transition specification | A useful indicator of how much timing variation the USB isolator contributes. |
| Paired J-K jitter | 11 ps rms / 30 ps peak | Shows controlled jitter behavior on one high-speed USB transition pair. |
| Paired K-J jitter | 14 ps rms / 40 ps peak | Complements the paired transition measurement for a fuller timing picture. |
| Full-speed propagation delay | 110 ns typical | Full-speed USB behavior remains predictable through the isolation stage. |
| Full-speed differential jitter | 450 ps typical, next-transition specification | Documents timing stability for full-speed USB operation. |
| Spec | Value | System relevance |
|---|---|---|
| Isolator bus-side supply range | 4.5 V to 5.5 V VBUS operation | Matches the normal USB bus-power range on the source side. |
| Isolator local supply option | 3.0 V to 3.6 V operation on each side | Isolated local supply domains are used rather than relying only on upstream USB power. |
| Isolator idle current | 48 mA typical at high speed; 21 mA typical at low/full speed | Helps size the local power stage without stressing the USB connection. |
| Isolator temperature rating | -55 C to +125 C component operating range | The component margin suits a fanless audio enclosure. |
| USB hub supply rails | 3.3 V and 1.1 V device rails | Separates hub logic power from the USB connection itself. |
| USB hub temperature rating | 0 C to 70 C commercial device; -40 C to +85 C industrial variant | Shows the controller family is available for normal and wider-temperature builds. |
| USB power management | The USB regeneration stage supports controlled downstream power behavior and over-current status inputs | Downstream port behavior is actively managed rather than left as a passive cable path. |
| Charging capability | The USB regeneration stage supports configurable downstream charging modes when configured for that use | Documents controller capability even though audio use is focused on data integrity. |
| Role | A USB conditioning stage for electrically busy computers, streamers, and servers. |
|---|---|
| Source side | Computer, streamer, and music-server USB outputs where bus noise and ground leakage can follow the signal. |
| DAC side | The DAC receives either an isolated, regenerated USB connection or the optional AES/EBU output. |
| Works with | Final USB conditioning stage for USB DACs, or AES output stage when the system should feed an AES DAC. |
| What to listen for | Lower hash from the source side, a more settled stereo image, cleaner leading edges, and less glare in systems that are sensitive to USB noise. |
Quiet local rails and low-ripple regulation support the isolation barrier, regenerated USB stage, and OCXO reference so source noise is not replaced by supply noise.
