CODEC + Headphone Amp + Stereo Speaker Amp

The ACS422x68 is a low-power, high-fidelity integrated CODEC targeted at portable applications such as tablet computers, personal navigation devices, portable projectors and speaker docks. In addition to a high-fidelity low-power CODEC, the device integrates a stereo DDX™ Class-D speaker amplifier and a true capless headphone amplifier. Beyond high-fidelity for portable systems, the device offers an enriched “audio presence” through built-in audio processing capability.


  • High fidelity 24-bit stereo CODEC
    • DAC 124dB SNR, 102dB DNR, THD+N better than -82dB
    • ADC 90dB DNR, THD+N better than -80dB
  • Built in audio controls and processing
    • 3D Stereo Enhancement
    • 12-band Stereo Parametric Equalizers
    • Multiband Compressor/Limiter/Expander
    • Psychoacoustic Bass Enhancement for limited bass response drivers
    • High-frequency Psychoacoustic Content Restoration for Compressed Audio Content
  • Filterless Stereo DDX Class-D Speaker Driver
    • 3W/channel (4Ω), 10% THD+N typical
    • 1W/channel (8Ω) or 2W/channel (4Ω), 0.05% THD+N typical
    • Tri-state DDX Class-D achieves low EMI and high-efficiency
    • >80% efficiency at 1W
    • Spread spectrum support for reduced EMI output power mode
    • Anti-Pop circuitry
  • On-chip true cap-less headphone driver
    • 35mW output power (16Ω), 29mW output power (32Ω)
    • Charge-pump allows true ground centered outputs
    • 124dB SNR / 102dB DNR
  • I2S / LJ / RJ stereo digital audio interface (post ADC output, pre-DSP input)
  • Stereo microphone / line-in interface
    • Stereo analog microphone or line-in inputs
    • Stereo digital microphone inputs (ACS422D68)
    • Automatic level control
  • On-chip low-jitter PLL for audio timing
  • Low power with built in power management
    • 1.7 V CODEC supports 1Vrms
    • Very low standby and no-signal power consumption
    • 1.8V digital / 1.7V analog supply for low power
  • 2-wire (I2C compatible) control interface
  • Package Options
    • 48-pin 7x7mm QFN (Quad Flat No-leads) Package
    • 68-pin dual-row 6x6mm TLA (Thermal Leadless Array) Package
    • 63-pin dual-row 5x5mm HLA™ (Hi-density Leadless Array) Package

Product Specification

Interfaces DAC Mono Channels (#) ADC Mono Channels (#) Analog Supply Voltage (V) Prog. Clock Clock Support Headphone Amps Spkr. Amp Type Digital Mic. Support Low Power Mode Advanced Features
I2C, I2S 2 2 1.8 Yes MCLK In, ACLK 1 Capless,
1 Standard
Stereo Class-D Dual, None Yes 12-Band Stereo PEQ, Wideband DRC Pro-style Multiband Compressor / Limiter / Expander, 3D Stereo Enhancement, Psychoacoustic Bass Enhancement, Compressed Audio High-Frequency Restoration


Title Type Format File Size Post Date File Date / Version
ACS422x68 Reference Schematic Reference Schematic PDF 83kB 12-07-16 12-07-16, Rev A
 ACS42x68 Product Brief Product Brief PDF TBD TBD TBD
 ACS422x68 Data Sheet Data Sheet PDF 934kB 5-18-17 5-18-17, Rev 2.2
 AN02: Configuring Audio Processing Algorithms using the Audio System Configurator (ASC) Tool App Note PDF 1.5MB 06-07-17 06-07-2017, v1.0

Software Support

Title Type Format File Size Post Date File Date / Version
Tempo ASC Tuning Tool Windows-based GUI Application EXE (Zipped) 851kB 05-11-17 05-08-17 / ASC_0509
Tempo ASC Release Notes Windows-based GUI App Release Notes Text 16kB 05-11-17 05-08-17
Linux Drivers Source Code C N/A 05-11-17 See GitHub