Hello everyone,
What could replace Raspberry Pi to stream music form Spotyfi And Tidal. I need less noisy USB than Raspberry Pi to plug it to DAC.

The Pi is an excellent streaming source but indeed noisy and equipped with a very high jitter level clock. The trick is to use some kind of galvanic barrier and/of fifo with reclocker like this one: https://www.audiophonics.fr/en/dac-and-interfaces-for-raspberry-pi/ian-canada-fifopi-q2-ultimate-reclocker-module-fifo-pcm-32bit-768khz-dsd1024-dop-p-13823.html

Anyone who’s done an electronics project knows the most important part of any good design is making sure to keep the magic smoke inside of all of the components. There are a lot of ways to make sure the smoke stays in there, but one of the most important is making sure that the power supply is isolated. If you’re using a USB port on a computer as your power source, though, it can be a little more complicated to isolate it from the computer.

https://github.com/wagiminator/ATtiny412-USB-Power-Isolator

For some applications, a galvanically isolated power supply is required to avoid ground loops or short circuits, or simply for mutual protection. The USB Power Isolator offers the possibility of a simple isolation (2.5kV) of the 5V rail of a USB power adapter with an unregulated output and a maximum continuous current of 1A. The USB Power Isolator isolates the power rail only, for full isolation including data lines take a look at the ADuM3160 USB Isolator.

USB 2.0 signaling with automatic detection of low, full, and high speed connections

1.5 Mbps, 12 Mbps, and 480 Mbps data rates

Bidirectional USB isolator for upstream or downstream ports

Redriving and high speed data retiming for input jitter removal and an open eye
Flexible clock input options

4.5 V to 5.5 V VBUSx or 3 V to 3.6 V operation on each side

21 mA typical idle, low or full speed mode supply current
48 mA typical idle, high speed mode supply current

Operating temperature range: −55°C to +125°C
20-lead, wide-body, increased creepage SOIC_IC package with 8.3 mm creepage and clearance

The Universal Serial Bus (USB) increasingly finds use in industrial applications, where it can support software upload and configuration, assist with diagnostics and maintenance, and connect peripheral devices. However, USB was defined as a consumer-electronics interface, and it doesn’t inherently tolerate the noise disturbances, ground bounce, and ground potential differences found in industrial environments.

To overcome such limitations and meet the needs of a broad spectrum of factory-automation, medical-equipment, and power-delivery applications, you can implement a galvanically isolated USB interface. However, you will need to ensure that your interface complies with EMI standards and minimizes inter-symbol interference (ISI).

Texas Instruments offers a variety of isolated USB solutions that integrate a galvanic isolation barrier into a USB interface (Fig. 1). The company’s ISOUSB211 and ISOUSB111 isolated USB repeaters each provide high-voltage protection and enhanced signal integrity for USB 2.0 interface systems.

Both devices support charging-downstream-port (CDP) advertising, role-reversal, and automatic speed detection, which allows the same part-number device to be used for host, peripheral, hub, or cable isolation. In addition, both come in reinforced and basic isolation options, offering isolation voltages of 5,700 VRMS and 300 VRMS, respectively, in accordance with UL 1577.

Available in an SSOP-28 package, the ISOUSB211 supports the 480-Mb/s High Speed (HS) mode in addition to the 12-Mb/s Full Speed (FS) and 1.5-Mb/s Low Speed (LS) modes. The ISOUSB211 meets HS signal-quality requirements without the need for an external crystal oscillator or clock input. Its incremental jitter is low enough to meet USB eye-diagram specifications without retiming.

Electromagnetic-compatibility (EMC) performance is a key consideration when choosing a USB isolator for industrial applications. Figure 2 shows the emissions performance of the ISOUSB111 compared with that of a competitive device when used in a test setup with a 1-m cable between a PC and a USB drive. At one point, the ISOUSB111 offers emissions more than 20 dB lower than that of a competitive device, which fails to achieve compliance with the CISPR 32 Class B standard.

Pre-emphasis and Equalization

A USB isolated repeater generates a fresh copy of its input signal across its isolation barrier, and input-signal jitter will appear at the repeater’s output. The repeater itself includes on-off keying circuitry that can contribute additional jitter. Total jitter on the repeater’s output is the root-sum-squared value of the input jitter and the jitter generated by the isolation circuitry.

You can minimize the adverse effects by choosing a repeater that includes transmitter pre-emphasis and receiver equalizer capabilities. These play a key role in improving signal integrity and reducing the frequency-dependent ISI caused by PCB trace losses.

However, if you’re using the repeater in a system that has differential trace loss greater than 2 dB, you should try to distribute the loss on both the upstream and downstream sides of the repeater. Then, use both receiver equalization and transmitter pre-emphasis simultaneously to compensate for the system loss.