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.
Uses a high-speed USB isolation stage for low, full, and high-speed USB 2.0 across a reinforced digital isolation barrier.
The isolation stage redrives and retimes high-speed USB data before the regenerated handoff.
The regenerated USB stage creates the downstream USB connection used by the audio device.
The isolation barrier brings 5700 Vrms rating, 8.7 mm creepage and clearance, and low typical barrier capacitance into the product.
The isolation device adds strong common-mode transient immunity and IEC 61000-4-2 ESD behavior across the barrier.
Uses the DOCSC022F 24.0 MHz OCXO as the local reference for the USB regeneration 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. |
| Chain fit | 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.
