Ultra-Low-Power Audio Codec + Headphone Amp + Stereo Speaker Amp + Analog / Digital Mic Input

The TSCS42xx are low-power, high-fidelity integrated CODECs targeted at portable applications such as Bluetooth® applications, tablet computers, personal navigation devices, portable projectors, speaker docks, etc. The devices have been designed with rapid customization in mind. TSI is able to rapidly provide varying levels of integration, additional audio processing, etc., according to the needs of large markets or customers. Contact TSI with your clock programming requirements.


  • Incredible 124dB SNR
  • High-fidelity 32-bit stereo CODEC
  • 24-bands of fully configurable Parametric EQ (Peaking Filters)
    • Implemented as configurable BiQuads
    • Alternative filter types available: HPF, LPF, BPF, APF
  • Multiband Compressor / Limiter / Expander
  • Wideband DRC
  • 3D Stereo Enhancement
  • Psychoacoustic Bass Enhancement
  • High-frequency restoration for compressed audio content
  • Headphone Jack detection
  • Integrated, ground-referenced, capless headphone driver
    • Up to 35mW into 16 Ohms, < 1% THD+N
  • Two flexible I2S / LJ / RJ digital audio interfaces
  • Bluetooth™ PCM input compatibility
  • Three single-ended  analog microphone / line-in interfaces with supplied mic bias
  • Differential analog microphone / line-in interface with supplied mic bias
  • Stereo digital microphone interface
  • Ultra-low power consumption with integrated power management
  • Filterless Stereo DDX™ Amplifier Technology
  • 3W/Channel (4Ω) Stereo Class-D Digital Speaker Driver
  • 2-wire (I2C compatible) control interface
  • 48-pin 7x7mm QFN package
  • Commercial Temp (0C-70C) and Industrial Temp (-40C – 85C) Offerings

Product Specification

InterfacesDAC Mono Channels (#)ADC Mono Channels (#)Analog Supply Voltage (V)Prog. ClockClock SupportStereo
Headphone Amps
Spkr. Amp TypeAnalog Mic Support, Digital Mic SupportLow Power ModeAdvanced Features
1 x I2C,
2 x I2S / LJ / RJ
221.8Yes XTAL /CLK In, ACLK1 CaplessStereo Class-DDX2, 2Yes
  • 12-Band Stereo PEQ
  • Wideband DRC (Compressor / Limiter / Expander)
  • Pro-style Multiband Compressor / Limiter
  • 3D Stereo Enhancement
  • Psychoacoustic Bass Enhancement
  • Compressed Audio High-Frequency Restoration


TitleTypeFormatFile SizePost DateFile Date / Version
 TSCS42xx Reference SchematicReference SchematicPDF80 kB01-23-1701-18-17, Rev B
 TSCS42xx Sample Code Sample CodePDF382 kB01-04-1607-16-15
 TSCS42xx Product Brief Product BriefPDF161 kB04-13-17v1.2
 TSCS42xx Data Sheet Data SheetPDF1.2 MB10-27-20v1.8
 AN02: Configuring Audio Processing Algorithms using the Audio System Configurator (ASC) ToolApp NotePDF1.5 MB06-07-1706-07-2017, v1.0
 TSI42A2-RPIHAT-A Raspberry Pi HAT Evaluation BoardProduct BriefPDF431 kB09-25-18v0.5

Software Support

TitleTypeFormatFile SizePost DateFile Date / Version
Tempo ASC Tuning ToolWindows-based GUI ApplicationEXE (Zipped)851kB05-11-1705-08-17 / ASC_0509
Tempo ASC Release NotesWindows-based GUI App Release NotesText16kB05-11-1705-08-17
Linux Drivers for TSCS42xx / TSCS42xx Audio HAT BoardSource CodeC, HN/AN/ASee GitHub. Note: Mainlined into 4.16