BelaSigna 200
2.5 Input Stage
• Two separate input channels, each with two multiplexed inputs
• Two configurable preamplifiers for improved input dynamic range matching
• Two analog third-order anti-aliasing filters
• Two 16-bit oversampling ΣΔ A/D converters
• Two ninth-order low-delay wave digital filters (WDFs) for decimation and DC removal with configurable digital gains for optimal
channel matching
2.6 Output Stage
• Two output channels (full stereo)
• Two 16-bit oversampling ΣΔ D/A converters
• Two line-level analog outputs
• Two configurable output attenuators for improved output dynamic range matching
• Two analog third-order anti-aliasing filters
• Two pulse-density modulation (PDM)-based direct digital outputs capable of driving low-impedance loads
2.7 Peripherals and Interfaces
2.7.1. Analog Interfaces
• Six external low-speed A/D converter (LSAD) inputs can be used with analog trimmers (e.g., potentiometers, analog switches, etc.)
• Two internal LSAD inputs tied directly to ground and supply can be used for supply monitoring
2.7.2. Digital Interfaces
• 16-pin general-purpose I/O (GPIO) interface
• Serial peripheral interface (SPI) communications port with interface speeds up to 640kbps at 1.28MHz system clock
• Pulse-code modulation (PCM) interface for high-bandwidth digital audio I/O
• Configurable RS-232 universal asynchronous receiver/transmitter (UART)
• RS-232-based communications port for debugging and in-circuit emulation
• Two-wire synchronous serial (TWSS) interface with speeds up to 100kbps at 1.28MHz system clock and up to 400kbps at higher
system clocks (slave mode support only)
2.7.3. System
• Integrated watchdog timer
• General-purpose timer
• External clock input division circuitry to support a wide range of external clock speeds
Rev. 16 | Page 3 of 43 | www.onsemi.com
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