ALC4042

Part: ALC4042-CG — Realtek Semiconductor Corp.

Type: USB 2.0 Audio Codec with I2S Audio Controller and Hardware Active Noise Cancellation

Description: Single-chip USB 2.0 audio codec with embedded USB 2.0 to I2S and SPDIF interface, supporting high-resolution audio playback up to 32-bits and 384KHz sample rate, DSD decoder/encoder, and integrating a Class-G headphone amplifier.

Operating Conditions:

• Supply voltage: 3.3 V
• Operating temperature: -40 to +85 °C

Absolute Maximum Ratings:

• Max supply voltage: 3.6 V
• Max junction/storage temperature: 125 °C

Key Specs:

• DAC SNR: 100 dBA
• ADC SNR: 94 dBA
• DAC Sample Rate: 8K/16K/22.05K/24K/32K/44.1K/48K/96K/176.4K/192K/384KHz
• ADC Sample Rate: 8K/16K/22.05K/24K/32K/44.1K/48K/96K/176.4K/192K/384KHz
• DAC Resolution: 16/24/32-bit
• ADC Resolution: 16/24/32-bit
• I2C Clock Frequency (SCL): 100 kHz (Standard Mode), 400 kHz (Fast Mode)
• I2S Master Mode Bit Clock Frequency (BCLK): 1.536 MHz to 12.288 MHz

Features:

• USB 2.0 function controller and transceiver
• High speed MCU (Micro Processor Unit)
• DC-to-DC regulators
• Digital audio I2S interface
• I2C control interface
• SPI interface
• Hardware Direct-Stream-Digital (DSD) native decoder (64Fs/128Fs/256Fs)
• DSD over PCM (DoP) decoder and encoder (64Fs/128Fs)
• Class-G ultra-low-power cap-saving headphone amplifier
• Supports standard USB audio device class for Windows, Linux, Android
• Configurable GPIO pins

Applications:

• USB audio devices

Package:

• QFN-48

• Digital-to-Analog Converter with 100dBA SNR
• Analog-to-Digital Converter with 94dBA SNR
• One stereo DAC supports 8K/16K/22.05K/24K/32K/44.1K/48K/96K/176.4K/192K/384KHz Sample Rate, 16/24/32-bit resolution
• Two stereo ADCs support 8K/16K/22.05K/24K/32K/44.1K/48K/96K/176.4K/192K/384KHz Sample Rate, 16/24/32-bit resolution
• Integrates hardware Direct-Stream-Digital (DSD) native decoder (64Fs/128Fs/256Fs) and DSD over PCM (DoP) decoder and encoder (64Fs/128Fs) for both I2S and headphone outputs
• Class-G type amplifier for headphone output without DC blocking capacitors
• 7-Band hardware EQ function for playback path (HPFx2, BPFx3, LBFx1, Biquadx1 )
• 6-Band hardware EQ function for recording path (LPFx1, HPFx1, BPFx4)
• 0.5mA current consumption for USB suspend and Ultra-Low-Power for headphone playback
• 2 nd Gen. Realtek Proprietary Hardware Feed-Forward or Feedback Active Noise Cancellation (ANC)
• One S/PDIF Out interface supports 44.1/48/88.2/96/176.4/192KHz sample rate for PCM format playback and AC-3 format data transfer
• Single-ended analog microphone inputs with volume gain control in 0.375dB per step
• Microphone boost gain settings of 0/10/20/30dB
• Low noise microphone and programmable MICBIAS voltage level
• Analog-to-analog and side tone pass-through path with volume gain adjustments
• Audio jack detection feature
• Supports combo jack with stereo headphone output and mono microphone input on a four-conductor headset jack for CTIA and OMTP type headsets without external components
• 4-Button Headset in-line controls support Android Wired Audio Headset Specification with customizable multi-function
• External active speaker humming noise cancellation

• One I2S interface supports 8K/16K/22.05K/32K/44.1K/48K/88.2K/96K/176.4K/192K/384kHz sample rate and , 16/24/32-bit resolution
• I2S digital interface supports TDM format up to 8CH output/input data transfer simultaneously
• I2C control interface supports master mode
• Two stereo digital microphone interfaces with shared clock rate support 0.1875M/0.375M/0.75M/1.5M/3M/6MHz
• SPI (Serial Peripheral Interface, Mode 0~Mode 3) connection to serial flash for switching code and configuration of customized parameters
• UART interface for external devices
• Embedded 64K Byte flash and 16K Byte OTP for F/W programming
• Built-in Analog LDO, supports voltage input supply range from 3.0V to 5.0V
• 48-pin QFN 'Green' package

• USB Docking Station for Notebook, Tablet, PCs
• Mobile Phone audio accessary
• Embedded USB audio applications
• USB Type-C audio headset, microphone, speaker and generic audio accessories
• USB gaming headset and generic audio accessories

Figure 2. Pin Assignments

Table 11. DC Characteristics

Table 11. DC Characteristics

Table 9. Absolute Maximum Ratings

Table 10. Recommended Operating Condition

To guarantee the best compatibility and performance quality in hardware design with specific requirements, please contact Realtek to receive the latest application circuits. Any modification made to the reference circuits is recommended to be reviewed by Realtek. Realtek may update the latest application circuits without modifying this datasheet.