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PCM2707C Datasheet(PDF) 26 Page - Texas Instruments |
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PCM2707C Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 53 page  PCM2704C, PCM2705C, PCM2706C, PCM2707C SBFS036B – MAY 2015 – REVISED AUGUST 2015 www.ti.com 9.5 Programming 9.5.1 USB Interface Control data and audio data are transferred to the PCM2704C/5C/6C/7C through the D+ pin (pin 9 for the PCM2704C/5C, pin 23 for the PCM2706C/7C) and D– pin (pin 8 for the PCM2704C/5C, pin 22 for the PCM2706C/7C). D+ should be pulled up with a 1.5-k Ω (±5%) resistor. To avoid back voltage in self-powered operation, the device must not provide power to the pullup resistor on D+ while VBUS of the USB port is inactive. All data to/from the PCM2704C/5C/6C/7C are transferred at full speed. Table 4 shows the information that is provided in the device descriptor. Some parts of the device descriptor can be modified through external ROM (PCM2704C/6C) or SPI (PCM2705C/7C). Table 4. Device Descriptor DEVICE DESCRIPTOR DESCRIPTION USB revision 1.1 compliant Device class 0x00 (device defined interface level) Device subclass 0x00 (not specified) Device protocol 0x00 (not specified) Max packet size for endpoint 0 8 bytes Vendor ID 0x08BB (default value, can be modified) 0x27C4/0x27C5/0x27C6/0x27C7 (These values correspond to the model number, and the value can Product ID be modified.) Device release number 1.0 (0x0100) Number of configurations 1 Vendor strings BurrBrown from Texas Instruments (default value, can be modified) Product strings USB AUDIO DAC (default value, can be modified) Serial number Not supported Table 5 shows the information contained in the configuration descriptor. Some parts of the configuration descriptor can be modified through external ROM (PCM2704C/6C) or SPI (PCM2705C/7C). Table 5. Configuration Descriptor CONFIGURATION DESCRIPTOR DESCRIPTION Interface Three interfaces 0x80 or 0xC0 (bus-powered or self-powered, depending on PSEL; no remote wake up. This value can Power attribute be modified.) 0x0A, 0x32, or 0xFA (20 mA for self-powered, 100 mA or 500 mA for bus-powered, depending on Max power PSEL and HOST. This value can be modified.) Table 6 shows the information contained in the string descriptor. Some parts of the string descriptor can be modified through external ROM (PCM2704C/6C) or SPI (PCM2705C/7C). Table 6. String Descriptor STRING DESCRIPTOR DESCRIPTION 0 0x0409 1 BurrBrown from Texas Instruments (default value, can be modified) 2 USB AUDIO DAC (default value, can be modified) 26 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: PCM2704C PCM2705C PCM2706C PCM2707C |
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