SCDT002A april 2023 – june 2023 SN3257-Q1 , TS3A27518E-Q1
I2S (Inter-IC Sound Bus) is a serial bus interface used for connecting audio devices together. Typically, a three-line protocol consisting of a Serial Clock (SCK), Word Select (WS) and Serial Data (SD) lines is used for these applications, though the need for a Word Select line is not always needed. A multiplexer can be used to help support multiple audio peripherals using a single I2S bus. Since these are passive, bidirectional parts they give the user the ability to either multiplex (MUX) or demultiplex (DEMUX) the respective signals.
Figure 1 2-Channel Implementation of
I2S Using SN3257-Q1
Figure 2 3-Channel Implementation of
I2S Using TS5A23157-Q1Design Considerations
- Select multiplexers with enough bandwidth and the appropriate channel count to support the needs of the application.
- Powered-off protection can help protect against voltages present on the inputs when the multiplexer is not powered.
- For battery powered systems, select multiplexers with low supply current to maximize battery life.
- Learn about multiplexer parameters with TI Precision Labs Videos.
- Ask a question on our TI E2E™ Design Support Forum.
Table 1 Recommended Parts
| Part Number | VCC Range (V) | Configuration | Bandwidth | RON (Ω) | Supply Current (μA) | Features |
|---|---|---|---|---|---|---|
| SN3257-Q1 | 1.5 to 5.5 | 2:1 4-channel | 2.0 GHz | 5 | 40 | 1.8-V compatible control inputs, break-before-make, fail-safe logic, powered-off protection |
| TS3A27518E-Q1 | 1.65 to 3.6 | 2:1 6-channel | 240 MHz | 4.4 | 0.04 | 1.8-V compatible control inputs, break-before-make, powered-off protection |
| TMUX1574 | 1.5 to 5.5 | 2:1 4-channel | 2.0 GHz | 2 | 40 | 1.8-V compatible control inputs, fail-safe logic, Integrated pulldown resistor on logic pin, powered-off protection, supports input voltage beyond supply |
| TS5A23157-Q1 | 1.65 to 5.5 | 2:1 2-channel | 220 MHz | 15 | 0.01 | Break-before-make, low charge injection, functional safety capable |