AsahiKASEI AK4493 - User Manual

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[AK4493]

017012230-E-00 2017/12

- 1 -

1. General Description

The AK4493 is a new generation Premium 32-bit 2ch DAC with VELVET SOUND

technology,

achieving industry’s leading level low distortion characteristics. The newly adopted OSR-Doubler

technology establishes wide signal band, low power consumption and low distortion characteristics.

Moreover, the AK4493 has six types of 32-bit digital filters, realizing simple and flexible sound tuning in a

wide range of applications. The AK4493 accepts up to 768kHz PCM data and 22.4MHz DSD data, ideal

for high-resolution audio source playback that is becoming widespread in network audio, USB-DAC, etc.

Application: AV Receivers, CD/SACD Players, Network Audios, USB DACs, USB Headphones, Sound

Plates/Bars, Measurement Equipment, Control Systems, IC-Recorder, Bluetooth

Headphone, HD Audio/Voice Conference Systems.

2. Features

 THD+N: -113dB

 DR, S/N: 123dB (2Vrms), 125dB (Large Amplitude Mode), 126dB (Mono Mode)

 256 Times Over Sampling

 Sampling Rate: 8kHz  768kHz

 32-bit 8x Digital Filter

- Short Delay Sharp Roll-off, GD = 6.0/fs,

- Short Delay Slow Roll-off, GD = 5.0/fs

- Sharp Roll-off

- Slow Roll-off

- Low Dispersion Short Delay Filter

- Super Slow Roll-off

 High Tolerance to Clock Jitter

 Low Distortion/ Low Noise High Performance Differential Amplifier Output

 Large Amplitude Output Mode

 DSD64, DSD128, DSD256, DSD512 Input Support

- Filter1 (fc = 39kHz, DSD64 mode), Filter2 (fc = 76kHz, DSD64 mode)

 Digital De-emphasis for 32, 44.1 and 48kHz sampling

 Soft Mute

 Digital Attenuator (255 levels and 0.5dB step + mute)

 Mono Mode

 External Digital Filter Interface

 Audio I/F Format: 24/32 bit MSB justified, 16/20/24/32 bit LSB justified, I

S, DSD, TDM

 Master Clock

8kHz ~ 32kHz: 256fs or 384fs or 512fs or 768fs or 1152fs

8kHz ~ 54kHz: 256fs or 384fs or 512fs or 768fs

8kHz ~ 108kHz: 256fs or 384fs

108kHz ~ 216kHz: 128fs or 192fs

~ 384kHz: 32fs or 48fs or 64fs or 96fs

~ 768kHz: 16fs or 32fs or 48fs or 64fs

 3-wire, I

C-bus Register Control Interface, or Pin Control

 Power Supply:

TVDD = AVDD = 3.0  3.6V (by internal LDO), VDDL/R = 4.75 ~ 5.25V

TVDD = AVDD = DVDD  3.6V (by external supply), DVDD = 1.7V  1.98V

VDDL/R = 4.75 ~ 5.25V

 Operational Temperature: -40 ~ 85 °C

AK4493

Quality Oriented 32-Bit 2ch DAC

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The AK4493 is a new generation Premium 32-bit 2-channel Digital-to-Analog Converter (DAC) featuring VELVET SOUND™ technology, designed to achieve industry-leading low distortion characteristics. This device is ideal for high-resolution audio source playback in various applications such as AV receivers, CD/SACD players, network audios, USB DACs, USB headphones, sound plates/bars, measurement equipment, control systems, IC recorders, Bluetooth headphones, and HD audio/voice conference systems.

Function Description:

The AK4493 converts either PCM or DSD data to an analog signal and supports an external digital filter interface. In PCM mode, data is input via BICK, LRCK, and SDATA pins. In DSD mode, data is input via DCLK, DSDL, and DSDR pins. For the external digital filter (EXDF) mode, data is input via BCK, DINL, DINR, and WCK pins. The device supports PCM mode in Pin Control Mode.

The AK4493 offers both manual and automatic settings for switching to DSD mode. In manual setting mode (ADPE bit = “0”), D/A conversion mode switching between PCM and DSD is executed by the DP bit. This switching must occur during the reset state by setting the RSTN bit to “0” and takes 2/fs to 3/fs for data mode switching. The external digital filter interface is selected by setting the DP bit to “0” and EXDF bit to “1”. Internal/external digital filter switching by the EXDF bit must be executed during reset by the RSTN bit to “0” and takes 2k/fs to 3k/fs. In Auto Setting Mode (ADPE bit = “1”), the DP bit setting is ignored, and the AK4493 monitors input signals on pin 4 to select PCM or DSD mode when EXDF bit = “0”, and pin 6 to select EXDF or DSD mode when EXDF bit = “1”.

The device includes channel-independent digital output volumes (ATTL/R) with 256 levels at 0.5dB steps, including MUTE. Volume changes are executed in soft transition to prevent switching noise. It can attenuate input data from 0dB to -127dB and MUTE when the output signal level is 0dB (ATTL/R[7:0] bits = “FFH”). The transition time for digital output volume is set by ATS[1:0] bits.

The AK4493 features a gain adjustment function, allowing the analog output amplitude to be adjusted by GC[2:0] bits. It also has a channel-independent zero detection function, with a zero detection flag output from the DZFL/R pin when the DZFE bit = “1” and DDMOE bit = “0”. The polarity of the detection flag can be selected by the DZFB bit. The zero detect function can be disabled by setting DZFE bit = “0” or when Volume Bypass is selected in DSD mode.

The device includes an LR Channel Output Signal Select and Phase Inversion Function. In register control mode, input and output combinations can be changed by MONO and SELLR bits, and the output signal phase can be inverted by INVL and INVR bits. In pin control mode, the phase of the R channel output can be inverted by setting the INVR pin.

A Sound Quality Adjustment Function is available, controlled by SC[2:0] bits. The analog characteristics are specified and guaranteed in Setting 1 and Setting 5 combined, which is fixed in Pin Control Mode.

The AK4493 also features an independent full-scale detection function for each channel in DSD mode. The analog output signal can be muted after detecting a full-scale signal by setting the DDM bit to “1”. If the input data of either Lch or Rch is continuously "H" or "L" for a period set by DDMT[1:0] bits, the AK4493 enters full-scale detection state, and the corresponding DML or DMR bit becomes "1".

An Automatic Mode Switching Function (PCM/EXDF ⇔ DSD Mode) is available by setting ADPE bit = “1”. The AK4493 detects DSD or PCM/EXDF mode from input signals on the BICK/BCK/DCLK, LRCK/DSDR, and WCK pins. The result of automatic mode detection can be read out by the ADP bit.

Important Technical Specifications:

THD+N: -113dB
DR, S/N: 123dB (2Vrms), 125dB (Large Amplitude Mode), 126dB (Mono Mode)
Over Sampling: 256 Times
Sampling Rate: 8kHz ~ 768kHz
Digital Filter: 32-bit 8x Digital Filter with types including:
- Short Delay Sharp Roll-off (GD = 6.0/fs)
- Short Delay Slow Roll-off (GD = 5.0/fs)
- Sharp Roll-off
- Slow Roll-off
- Low Dispersion Short Delay Filter
- Super Slow Roll-off
Clock Jitter Tolerance: High
Output: Low Distortion/Low Noise High Performance Differential Amplifier Output, Large Amplitude Output Mode
DSD Input Support: DSD64, DSD128, DSD256, DSD512
- Filter1 (fc = 39kHz, DSD64 mode)
- Filter2 (fc = 76kHz, DSD64 mode)
Digital De-emphasis: For 32, 44.1, and 48kHz sampling
Digital Attenuator: 255 levels and 0.5dB step + mute
Audio I/F Format: 24/32 bit MSB justified, 16/20/24/32 bit LSB justified, I2S, DSD, TDM
Master Clock:
- 8kHz ~ 32kHz: 256fs or 384fs or 512fs or 768fs or 1152fs
- 8kHz ~ 54kHz: 256fs or 384fs or 512fs or 768fs
- 8kHz ~ 108kHz: 256fs or 384fs
- 108kHz ~ 216kHz: 128fs or 192fs
- ~ 384kHz: 32fs or 48fs or 64fs or 96fs
- ~ 768kHz: 16fs or 32fs or 48fs or 64fs
Control Interface: 3-wire, I2C-bus Register Control Interface, or Pin Control
Power Supply:
- TVDD = AVDD = 3.0 ~ 3.6V (by internal LDO), VDDL/R = 4.75 ~ 5.25V
- TVDD = AVDD = DVDD ~ 3.6V (by external supply), DVDD = 1.7V ~ 1.98V
- VDDL/R = 4.75 ~ 5.25V
Operational Temperature: -40 ~ 85 °C
Digital Input Level: CMOS
Package: 48-pin LQFP

Usage Features:

Flexible Sound Tuning: Six types of 32-bit digital filters allow for simple and flexible sound tuning across a wide range of applications.
High-Resolution Audio: Supports up to 768kHz PCM data and 22.4MHz DSD data, making it suitable for high-resolution audio playback.
Control Modes: Functions can be controlled via either Pin Control Mode or Register Control Mode. The PSN pin selects the control mode.
Soft Mute: The soft mute operation is performed in the digital domain, attenuating the output signal to -∞ during ATT_DATA × ATT transition time, preventing noise.
Internal LDO: When LDOE pin is "H", the internal LDO supplies 1.8V to the digital core (DVDD) from TVDD (3.0V to 3.6V).
Power-Down/Reset: The AK4493 enters power-down mode when the PDN pin is "L", stopping all circuits and initializing them, with analog output becoming Hi-Z. Power-down is released by setting PDN to "H".
Clock Synchronization: A clock synchronize function resets the internal counter to maintain timing between the internal clock CLK1 and the external clock edge, ensuring group delays are kept within 4/256fs when using multiple AK4493s.

Maintenance Features:

Error Detection: The AK4493 includes an error detection function for LDO operation (LDOE pin = "H"). If an LDO overvoltage or overcurrent is detected, the internal LDO powers down, and the analog output becomes Hi-Z. A reset (PDN pin = "L" → "H") is required to recover.
Shutdown Switch: A shutdown switch between the DVDD pin and the internal VDD for the digital core prevents SIDD leak.
Analog Output Overcurrent Protection: Analog output pins AOUTLP/LN and AOUTRP/RN have channel-independent overcurrent protection, limiting output current to 85mA (typ.) if exceeded. This protection is invalid if PDN is "L", PW bit is "0", or MCLK is stopped.
MCLK Stop Detection: If MCLK stops for more than 1µs during normal operation (PDN pin = "H"), the AK4493 automatically enters a power-down state, and the analog output becomes Hi-Z. It resumes operation when MCLK is input again, without reinitializing register settings.

AsahiKASEI AK4493 Specifications

General

Brand	AsahiKASEI
Model	AK4493
Category	Measuring Instruments
Language	English