120dB 768kHz/32-bit 2ch Premium DAC for portable audio devices

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Premium DACs AK4490EN
The AK4490EN inherits high quality sound technologies of the AK4490EQ that has been adopted by many audio products since it was launched in 2014. Downsizing the package and supporting a 1.8 V digital interface, the AK4490EN is ideal for portable applications. It supports high resolution sound sources as a digital input and up to 768 kHz PCM and 11.2 MHz DSD (Direct Stream Digital) data.



Premium DAC AK4490EN

● Optimized for Portable Applications
The AK4490EN is the first device with a QFN package (6mm□) in VERITA series, drastically downsized from the AK4490EQ (9mm□).
It supports a 1.8 V digital interface in addition to conventional 3.3 V digital interface, corresponding to various systems including portable applications.

● High Quality Sound Equal to The AK4490EQ with “VELVET SOUND” Technology.
The AK4490EN achieves -112 dB THD+N, the top level performance in the 120dB S/N class of DAC. This DAC reduces sound quality degradation caused by noise shaping realizing a flat noise floor up to 200 kHz with AKM’s original switched capacitor filter and OSR Doubler technology. In addition, 32-bit processing and L/R symmetrical layout also optimized for sound quality.
Five different 32-bit digital filter types are available: Short delay sharp roll-off and short delay slow roll-off filters have overall short delay characteristics. Sharp roll-off filter and slow roll-off filter preserve the phase difference and a new filter that has even slower roll-off character was added to these four filters. They are selectable according to the user audio and system preferences.

● Application
Portable Audio (Smartphones, Tablets, Portable Music Players)

Key Features

• 256x Over sampling
• Sampling Rate: 30kHz ~ 768kHz
• 32-bit 8x Digital Filter
   - Ripple: -0.005dB, Attenuation: 100dB
   - Short Delay Sharp Roll-off, GD=6.25/fs
   - Short Delay Slow Roll-off, GD=5.3/fs
   - Sharp Roll-off
   - Slow Roll-off
   - Super Slow Roll-off
• High Tolerance to Clock Jitter
• Low Distortion Differential Output
• 2.8MHz, 5.6MHz and 11.2MHz DSD Input Support
   - Filter (fc=50kHz, fc=150kHz, 2.8MHz mode)
• Digital De-emphasis for 32, 44.1, 48kHz sampling
• Soft Mute
• Digital Attenuator (255 levels and 0.5dB step + Mute)
• Mono Mode
• External Digital Filter Mode
• THD+N: -112dB
• DR, S/N: 120dB (Mono mode: 123dB)
• I/F Format: 24/32bit MSB justified, 16/20/24/32bit LSB justified, I2S, DSD
• Master Clock:
        30kHz ~ 32kHz: 256fs, 384fs, 512fs, 768fs, 1024fs or 1152fs
        30kHz ~ 54kHz: 256fs, 384fs, 512fs or 768fs
        30kHz ~ 96kHz: 256fs, 384fs or 512fs
        30kHz ~ 108kHz: 256fs or 384fs
        108kHz ~ 192kHz: 128fs, 192fs or 256fs
        108kHz ~ 216kHz: 128fs or 192fs
                     384kHz: 32fs, 48fs, 64fs or 96fs
                     768kHz: 16fs, 32fs, 48fs or 64fs
• Power Supply: DVDD=AVDD=3.0 ~ 3.6V, TVDD=1.6V ~ DVDD,
                      VDDL/R= VREFHL/VREFHR=4.75 ~ 5.25V
• Digital Input Level: CMOS
• Package: 48-pin QFN

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