108dB 216kHz 32Bit ΔΣ CODEC with PLL

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Advanced Audio Devices


The AK4558 is a 32-bit 2ch audio CODEC with PLL that meets demands of DTM (Desk Top Music) users who enjoy music making and editing on the go. The AK4558 realizes both “high quality sound performance” and “low power consumption characteristics” by adopting VELVET SOUND architecture that has been widely adopted by well-established high-end audio companies. It is suitable for audio interfaces for personal computers, smart phones and tablets to make and edit music.
The AK4558 is the next generation device of the AK4556, improving the data resolution to 32-bit from 24-bit and the analog characteristics while suppressing the power consumption about 30%.  The package size is also downsized to a QFN package.

● VELVET SOUND Architecture is adopted for DAC circuit.
- Low-distortion technology achieves industry’s best performance of -100dB as a DAC with 108dB S/N characteristic.
- OSRD (Over Sampling Ratio Doubler) technology greatly reduces out of band noises.

● High Quality Sound Digital Filter
- Short delay filters, 5fs for A/D converter and 5.8fs for D/A converter are integrated.

● Integrated PLL
- It reduces sound quality degradation caused by high frequency noise by reducing clock wiring on the printing board.

Key Features

1. Single-ended ADC

     - Dynamic Range, S/N: 108dB@AVDD=3.3V

     - S/(N+D):                      92dB@AVDD=3.3V

     - Selectable HPF for DC-offset cancel (fc = 1Hz @ fs=48kHz)

     - 4-types Digital Filter for High Sound Quality

2. Single-ended DAC

     - Dynamic Range, S/N: 108dB@AVDD=3.3V

     - S/(N+D):                    100dB@AVDD=3.3V

     - Digital de-emphasis for 32kHz, 44.1kHz and 48kHz sampling

     - 5-types Digital Filter for High Sound Quality

     -  Channel Independent Digital Attenuator (Linear 256 steps)

3. Audio I/F format: MSB First, 2’s Complement

     - ADC: 24/32bit MSB justified , 24/32bit I2S compatible or TDM

     - DAC: 24/32bit MSB justified, 16/20/24/32bit LSB justified,

                24/32bit I2S compatible or TDM

4. Input/Output Voltage: ADC = 2.64Vpp @ AVDD=3.3V

                                 DAC = 2.51Vpp @ AVDD=3.3V

5. Master/Slave mode

6. μP I/F: I2C Bus

7. Sampling Rate:

     (1) PLL Mode

          • PLL Slave Mode (LRCK pin): fs = 8kHz ~ 216kHz

          • PLL Slave Mode (BICK pin):  fs = 8kHz ~ 216kHz

          • PLL Master Mode: 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz,

                                        48kHz, 54kHz, 88.2kHz, 96kHz, 128kHz, 176.4kHz, 192kHz

     (2) External Clock Mode

          • Normal Speed:  8kHz to 54kHz     (256fs or 512fs)

                                    8kHz to 48kHz     (384fs or 768fs)

          • Double Speed: 54kHz to 108kHz   (256fs)

                                   48kHz to 96kHz    (384fs)

          • Quad Speed:  108kHz to 216kHz   (128fs)

                                   96kHz to 192kHz    (192fs)

8. Master Clock:

     (1) PL L Mode

          • MCKI pin: 27MHz, 26MHz, 24MHz, 19.2MHz, 13.5MHz, 13MHz, 12.288MHz, 12MHz, 11.2896MHz

          • LRCK pin: 1fs

          • BICK pin: 32fs, 64fs, 128fs(TDM), 256fs(TDM)

     (2) External Clock Mode (MCKI pin)

          • Slave mode: 256fs, 384fs, 512fs or 768fs   (Normal Speed)

                               256fs or 384fs                       (Double Speed)

                               128fs or 192fs                       (Quad Speed)

          • Master mode: 256fs or 512fs                     (Normal Speed)

                                 256fs                                  (Double Speed)

                                 128fs                                  (Quad Speed)

9. Power Supply:

          • AVDD = 2.4 to 3.6V (typ. 3.3V) 

          • TVDD = 1.7 to 3.6V (typ. 1.8V)

10. Power Supply Current: 18mA (fs=48kHz)

11. Ta = -40 to 105°C

12. Package: 28-pin QFN (0.5mm pitch)

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Block Diagram

Block Diagram

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