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Digital Upsampling Interface SRC AK4137 I2S 32Bit / 384kHz DSD256 HAT for Rapberry Pi
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Digital Interface
Digital Interface SRC AK4137 I2S 32Bit / 384kHz DSD256 HAT for Rapberry Pi
The interface is delivered with its screws only. Raspberry Pi is sold separately.
This HAT format digital interface module for Raspberry Pi integrates an AKM AK4137EQ chip supporting high sampling rates: PCM up to 32bit 384kHz and DSD up to DSD256. The audio signal is recovered in I2S from your Raspberry Pi. The AK4137EQ chip integrates a clock coupled to two other TXC clocks on the module, in order to considerably reduce jitter by allowing signal synchronization. This interface allows you to enjoy a high quality audio signal for rich and accurate sound reproduction.
The output is made on a 10 pins connector (DOUT) whose pinout is as follows:
- 1 : DSDON / DSDOE
- 2 : GND
- 3 : DATA / DSDL
- 4 : BCK / DCLK
- 5 : MCLK
- 6 : LRCK / DSDR
- 7 : OD1
- 8 : OD2
- 9 : GND
- 10 : MUTE
Another 20-pin connector (K) allows different settings to be made depending on the position of the jumper.
| Select output mode | ||
|---|---|---|
| Output mode | K1 | K2 |
| DSD64 | Short circuit | Short circuit |
| DSD128 | Not connected | Short circuit |
| DSD256 | Short circuit | Not connected |
| PCM | Not connected | Not connected |
| Bit depth selection | ||
|---|---|---|
| PCM Bit depth | K3 | K4 |
| 16bit | Short circuit | Short circuit |
| 20bit | Not connected | Short circuit |
| 24bit | Short circuit | Not connected |
| 32bit | Not connected | Not connected |
| Sampling rate selection | |||
|---|---|---|---|
| PCM Sampling rate | K5 | K6 | K7 |
| 44.1kHz | Short circuit | Short circuit | Short circuit |
| 48kHz | Not connected | Short circuit | Short circuit |
| 88.2kHz | Short circuit | Not connected | Short circuit |
| 96kHz | Not connected | Not connected | Short circuit |
| 176.4kHz | Short circuit | Short circuit | Not connected |
| 192kHz | Not connected | Short circuit | Not connected |
| 352.8kHz | Short circuit | Not connected | Not connected |
| 384kHz | Not connected | Not connected | Not connected |
| Filter selection | ||
|---|---|---|
| Filter | K8 | K9 |
| Short delay slow roll-off | Short circuit | Short circuit |
| Slow roll-off | Not connected | Short circuit |
| Short delay sharp roll-off | Short circuit | Not connected |
| Sharp roll-off | Not connected | Not connected |
| Activate DoP Mode | |
|---|---|
| Mode | K10 |
| Active DoP | Short circuit |
| Disabled DoP | Not connected |
To power the module, two possible methods are available: supply your Raspberry Pi with 5V via its Micro USB connector will also supply the interface, or directly supply the interface with 5V by soldering the GND and +5V points. DO NOT POWER THE INTERFACE AND RASPBERRY PI AT THE SAME TIME.
Technical characteristics
| Specifications | |
|---|---|
| Product type | Digital interface |
| Chip | AKM AK4137EQ |
| Input | GPIO 40 pins |
| Output | I2S 10 pins |
| Clocks | TCX 24.576 + TCX 22.5792 |
| Supported sampling rate | PCM up to 32bit 384kHz DSD up to DSD256 |
| General | |
|---|---|
| Power supply | 5VDC via Micro USB Raspberry Pi OR soldering points on the interface board (power supply sold separately) |
| Dimensions | 65 x 56mm |
| Space between fixation holes | 58 x 49mm |
| Package | 1x Digital Interface Screws |
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