SCT3089
Sub-GHz Intercom RF and Baseband Chip
Integrated Sub-GHz RF transceiver and baseband for intercom: 150 – 960 MHz, half duplex, full duplex, and multi-way for up to 6 people.
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SCT3089 is a highly integrated Sub-GHz RF transceiver and baseband chip for low power, long range voice communication, supporting the half duplex, full duplex and multi-way intercom protocols. With an internal codec (audio band ADC and DAC), it completes the data link layer and most of the call control layer processing, and adds noise suppression, acoustic echo cancellation, voice activity detection and automatic gain control. The firmware is held on chip and the host talks to it over UART; the 7 × 7 mm BGA120 package suits small form factor designs.
Key features
- Intercom protocols
- Half duplex and full duplex two-way intercom with ultra-low latency
- Multi-way intercom for up to 6 people in full duplex, with no limit on listeners (requires the matching firmware)
- Configurable channels
- Integrated Sub-GHz RF transceiver
- 150 – 960 MHz operating range
- -9 to +22 dBm RF output power
- -126 dBm sensitivity in half duplex (125 kHz bandwidth)
- Audio processing
- Noise suppression (NS) and acoustic echo cancellation (AEC)
- Voice activity detection (VAD) and audio automatic gain control (AGC)
- Built-in Sicomm vocoder
- Integrated audio codec
- Two-channel 24-bit sigma-delta ADC and DAC with audio PLL
- One differential input pair (left channel) and 2 single-ended inputs, two line outputs
- Programmable analogue and digital gain
- Host and peripheral interfaces
- UART host interface
- I2S (transmit-only and receive-only ports), I2C
- 7 programmable I/O ports
- Single 3.3 V supply
- On-chip DC/DC generates the 1.2 V core supply
- On-chip PLL up to 200 MHz, 147.456 MHz by default
- Crystal or external clock source, plus an on-chip ring oscillator
Typical applications
- Full duplex intercom devices
- Multi-way team communication
- Long-range low power voice terminals
Variants
| SCT3089RBL | Multi-way intercom firmware |
|---|---|
| SCT3089FBL | Two-way intercom firmware |