Hardware/Parallelport/Audio ADC DAC
From UIT
(Difference between revisions)
m (→Usage) |
m (→Usage) |
||
(5 intermediate revisions by 3 users not shown) | |||
Line 16: | Line 16: | ||
== Usage == | == Usage == | ||
− | + | [[File:ADC-DAC_board_with_resistors.jpeg|200px|thumb|right|ADC-DAC board with soldered resistors for DAC DC-offset]] | |
+ | The DAC is designed for audio applications, and therefore cancels out any DC-offset. If you need a DC-offset for your application, you have to solder a pull-up resistor on the negative input of the OpAmp, which then forms a voltage divider with the 3k3 Ω resistor (i.e. optimally a 6k6 Ω resistor). | ||
− | + | See the schematic for further information regarding offset and gain for the ADC and gain and LPF for the DAC. | |
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | + | ||
− | [[File: | + | === Projects === |
+ | ; [http://wiki.hevs.ch/fsi/index.php5/EMVs/AudioAmp Filiere Promotions for the EMVS] Day | ||
+ | : (Potential) future students can build a Class-D Audio Amplifier. | ||
+ | |||
+ | ; [[Projects/USLO|U-SLO]] | ||
+ | : The DAC links the triangle signal generated by an FPGA to the mirror driver board. | ||
+ | : The ADC converts the signal received from the optical sensor for processing by an FPGA. | ||
+ | |||
+ | == Audio Amp Test == | ||
+ | * Use FPGA-EBS v2.x | ||
+ | * Connect the AD-DA board via parallel cable | ||
+ | * Connect the Rotary Switch board via parallel cable | ||
+ | * Connect Mezzanine Audio Adapter board | ||
+ | * Power the FPGA via the Mezzanine connector | ||
+ | * Connect Step-Up with a coax cable | ||
+ | * Connect H-Bridge with the 1 Pin parallel cable | ||
+ | * Connect Step-Up with the H-bridge | ||
+ | * Connect H-Bridge with the Lowpass filter for the Loudspeaker | ||
+ | * Connect the Loudspeaker | ||
+ | * Power Step-up and H-Bridge with +12V - Gnd | ||
+ | |||
+ | [[File:PP_HEB_ADC_DAC_test.jpg|600px|Test of the PP HEB ADC DAC Board]] | ||
[[Category:Hardware]] [[Category:Parallelport]] | [[Category:Hardware]] [[Category:Parallelport]] |
Latest revision as of 08:35, 21 August 2014
|
Audio ADC DAC board
The board bases on 2 different chips.
- ADC Chip is a BB PCM1804 full differential analog input 24-BIT, 192-kHz stereo A/D converter.
- DAC Chip is a BB PCM1793 24-BIT, 192kHz Stereo D/A converter.
Version | Photo | Schematics | Description |
---|---|---|---|
V1.0 | ![]() |
Mezza ADC DAC Schematic PDF | ADC & DAC parallelport board |
Both the ADC and DAC Chips are supplied by +5V. These power is generated in two steps from the +3.3V power supply from the FPGA-EBS. In the first step with a steup up from +3.3V to ~+5.5V and in a second step, for the DAC and the ADC separably, a VLDO to +5V.
Usage
The DAC is designed for audio applications, and therefore cancels out any DC-offset. If you need a DC-offset for your application, you have to solder a pull-up resistor on the negative input of the OpAmp, which then forms a voltage divider with the 3k3 Ω resistor (i.e. optimally a 6k6 Ω resistor).
See the schematic for further information regarding offset and gain for the ADC and gain and LPF for the DAC.
Projects
- Filiere Promotions for the EMVS Day
- (Potential) future students can build a Class-D Audio Amplifier.
- U-SLO
- The DAC links the triangle signal generated by an FPGA to the mirror driver board.
- The ADC converts the signal received from the optical sensor for processing by an FPGA.
Audio Amp Test
- Use FPGA-EBS v2.x
- Connect the AD-DA board via parallel cable
- Connect the Rotary Switch board via parallel cable
- Connect Mezzanine Audio Adapter board
- Power the FPGA via the Mezzanine connector
- Connect Step-Up with a coax cable
- Connect H-Bridge with the 1 Pin parallel cable
- Connect Step-Up with the H-bridge
- Connect H-Bridge with the Lowpass filter for the Loudspeaker
- Connect the Loudspeaker
- Power Step-up and H-Bridge with +12V - Gnd