Functional Block Diagram | www.ti.com |
1.1Functional Block Diagram
Figure 1-1illustrates the functional block diagram of the DEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM.
| | I/V | | |
| CN003 | 5534a | | |
| Serial | | BALAmp | LchOUT |
| Connector | |
| | 5534a | (4.5VRMS) |
| | |
| | I/V | | |
| | 5534a | | |
S/PDIFIN | | DSDS1796 | | |
DAI | PCM1795 | | |
OPT | | |
CS8414 | PCM1796 | | |
Coax | | |
| PCM1798 | | |
| | | |
| | I/V | | |
| | 5534a | | |
| | | BALAmp | RchOUT |
| SW001−003 | | 5534a | (4.5VRMS) |
| | | |
| ModeControl | I/V | | |
| | | |
| | 5534a | | |
| | DEM-AS/CDACDaughterCard | | |
| | 3.3-V | | |
| | Regulator | | |
| | +VCC | ±AVCC | |
| | (5V) | (±15V) | |
| Figure 1-1. DEM-DSD1796/PCM1795/PCM1796/PCM1798 Block Diagram | |
1.2EVM Features
The DEM-DSD1796/PCM1795/PCM1796/PCM1798 series of stereo DACs consist of a DAI (S/PDIF) section that uses a DSD1796/PCM1795/PCM1796/PCM1798 DAC section, a differential current/voltage (I/V) section, and a balanced amplifier with a post-low-pass filter (LPF) section.
The DEM-DSD1796/PCM1795/PCM1796/PCM1798 requires a 5-V digital power supply for its digital circuits, a 5-V analog power supply for the device itself, and a ±15-V analog power supply for the balanced amplifier circuits.
The DAI section has both coaxial and optical inputs that are switch-selectable and capable of handling sampling rates up to 96 kHz.
The DSD1796/PCM1795/PCM1796/PCM1798 accepts PCM audio data input at a sampling rate up to 192
kHz, or a 64-fSDSD signal input, as determined by functional control settings and jumper connections on the board.
This evaluation fixture uses the DEM-DSD1796/PCM1795/PCM1796/PCM1798 demonstration board and demonstration software for functional evaluation and operational control of the DSD1796/PCM1795/PCM1796/PCM1798 DAC device.
8 | Description | SLEU057A–September 2004–Revised May 2009 |