AK4497EQ Official Standard Balanced Line Decoder! Support pure DSD decoding! . . . . .
AK4497 PCB size: 10 * 10cm
Balanced to single-ended board size: 4.8x4.8cm
Analog power supply DC+/-15V ( note: must be DC, can not connect AC)
Digital power supply AC single 9-12V ( this voltage can be AC)
The balanced-to-single-ended converter board power supply is output from the 4497 Pout
. . . Listening! . . AK4497 compared to AKM previous generation 4495 sound enhancement significantly (the official standard balanced line + balance to single-ended conversion board test). Sound more clear; better resolution; high-frequency more clearly not in the slightest; sound background is quieter; IF density, Naiting; listen to the human voice is more real, like singers in the live concert; sound layering better; Control is better, just right retractable; three very balanced! Is a rare good decoding!
This version supports I2S / DSD decoding
Pure soft control (onboard MCU)! Independent design using I2S / DSD signal input!
I2S maximum support 32bit data 768KHz sampling rate! Note: I2S requires I2S format (Philips format) data, does not support left-aligned or right-justified format (right-aligned is Sony format). Support DSD decoding (native support DSD decoding! Not DSD to PCM! Please do not be misled!), Support 2.8MHz, 5.6MHz, 11.2MHz, 22.4MHz DSD sampling rate!
AK4497 board with mute function, with the Italian interface can be achieved without noise for the DSD!
Support soft control volume (VOL port 10K single potentiometer to achieve, the default is not connected the potentiometer with short-circuit cap for the maximum volume)!
4497 board Each channel a dual op amp OPA1612 sound very good! Balance to single-end board with 5534, are designed to use the original AKM op amp, to ensure the effect!
1: the digital filter settings
total 8 kinds through the K1 K2 K3 set as shown below:
2: DSD sample rate setting
Four sampling rates corresponding to DSD64 DSD128 DSD256 DSD512 through K4 K5 settings as shown below
3: DSD filter settings
Setting via (K6):
K6 Set the cutoff frequency of the DSD filter: Low frequency is cut off, High frequency is shorted (K6 should be disconnected if shorted in DSD mode or noise may occur)
4: Gain setting
Setting via (K7):
K7 Set the gain: Disconnect is 2.8Vpp, Short is 3.75Vpp (K7 in the DSD mode when shorted please disconnect K6 Otherwise it may cause noise)
PS: In the DSD mode, K6 and K7 can not be shorted at the same time. Otherwise, the noise may occur. There is no effect in PCM mode.
5:DSD / PCM mode setting
With the K8 setting:
K8 short for the PCM mode, not connect is the DSD mode! It is also possible to set the DSD / PCM via pin 1 of the I2S interface. The I2S interface inputs low level to PCM mode and the I2S interface inputs high level to the DSD mode.
PS: When using I2S interface 1 foot switch PCM / DSD should be K port 8 disconnected, in the use of K8 switch PCM / DSD I2S interface 1 foot should be disconnected, otherwise it may lead to external signal source damage! . .
MUTE: MUTE pin will play normally when it is low level, mute when it is high level.
MUTE foot access to the Italian interface, the output signal can be quietly DSD mode for the song without noise! (Other devices have not tested this feature for the time being)
I2S interface definition:
1 DSDON; 2 GND; 3 DATA / DSD; 4 BCK / DCLK; 5 MCLK; 6 LRCK / DSDR
Board analog part of the official evaluation version IV LPF circuit. as follows. . .
package inlucde: Assembeld AK4497EQ DAC board X 1
Balanced to single-ended conversion board X1