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+ | ====== Yoga AD-100 ====== | ||
+ | The chip is from [[http://www.cmedia.com.tw|C-Media]] and appears to be the [[http://www.cmedia.com.tw/product/CM102_feature.htm|CM102A]]. You can download the {{hw:technical_brief_-_cmi102.pdf|Technical Brief}} or {{hw:cm102_oem_datasheet_rev_1.5.pdf|Data Sheet}}. | ||
+ | |||
+ | {{hw:yoga-ad-100.jpg?75}} | ||
+ | |||
+ | I picked up a [[http://www.google.com/search?q=Yoga+%22AD-100%22+usb|Yoga AD-100]] //Virtual 5.1 Channel USB Adapter// from [[http://www.jaycar.com.au|Jaycar]]. It's a standard USB-Audio chip ([[http://www.qbik.ch/usb/devices/showdev.php?id=3132|0x0d8c/0x0001]]) running at 12Mbps with a stereo audio socket. It has a reasonably beefy ampliier on-chip, at maximum volume it can over-drive headphones easily, and put out a respectable volume from a pair of small un-powered speakers. A switch on the side triggers a shutdown of the output stage of the chip, leaving the USB interface and decoder running. | ||
+ | |||
+ | Using my [[e:power monitoring board]], I measured the current draw of the AD-100. Plugged in to USB, but with the switch off it draws 12mA. With the switch on it jumps to 49mA, but that includes the blue LED. Plugging in a pair of amplified speakers has no effect of power use, while a pair of 8ohm 2 Watt unpowered speakers takes it to 55mA to 80mA, depending on what music is playing. | ||
+ | |||
+ | It appears the onboard 0.5 Watt amplifier is //good enough// for smaller speakers. For volumes above what it's able to drive, a good amp will give much better sound than most amplified PC speakers. | ||
+ | |||
+ | ===== C-Media blurb ===== | ||
+ | |||
+ | CM102A/CM102S USB Audio Controller\\ | ||
+ | Features | ||
+ | * USB v2.0 full speed operatible. | ||
+ | * Fully compliant with USB audio device class specification v2.0 | ||
+ | * USB bus powered 500mA operation with suspend mode support | ||
+ | * Single 12MHz crystal input with on-chip PLL and embedded USB transceiver | ||
+ | * USB audio function topology has 1 input terminal, 1 output terminal, and 1 feature unit | ||
+ | * Alternate zero bandwidth setting for releasing bandwidth on USB bus during inactive operation | ||
+ | * Isochronous transfer using adaptive synchronization with internal PLL | ||
+ | * High performance 48KHz sampling rate for audio playback | ||
+ | * Embedded high performance 16 bit audio DAC | ||
+ | * Embedded class AB power amplifier for speaker driving and enable/disable control pin | ||
+ | * Volume control input with simple external VR circuit | ||
+ | * Embedded power on reset block | ||
+ | * Single 5V external power supply with internal power regulation | ||
+ | * 3.3V IO with 5V tolerance; 3.3V core logics design | ||
+ | * Compatible with Win98 SE / Win ME / Win 2000 / Win XP, and Mac OS 9 / OS X without additional driver | ||
+ | * 18 pin PDIP (CM102)or SOP (CM102S) package | ||
+ | |||
+ | ===== Kernel messages ===== | ||
+ | |||
+ | usb 3-1: new full speed USB device using ohci_hcd and address 4 | ||
+ | usbaudio: device 4 audiocontrol interface 0 has 0 input and 1 output AudioStreaming interfaces | ||
+ | usbaudio: valid output sample rate 48000 | ||
+ | usbaudio: device 4 interface 1 altsetting 1: format 0x80000010 sratelo 48000 sratehi 48000 attributes 0x00 | ||
+ | usbaudio: registered dsp 14,3 | ||
+ | usbaudio: registered mixer 14,0 | ||
+ | |||
+ | ===== lsusb -v ===== | ||
+ | |||
+ | Bus 003 Device 020: ID 0d8c:0001 C-Media Electronics, Inc. | ||
+ | Device Descriptor: | ||
+ | bLength 18 | ||
+ | bDescriptorType 1 | ||
+ | bcdUSB 1.10 | ||
+ | bDeviceClass 0 (Defined at Interface level) | ||
+ | bDeviceSubClass 0 | ||
+ | bDeviceProtocol 0 | ||
+ | bMaxPacketSize0 8 | ||
+ | idVendor 0x0d8c C-Media Electronics, Inc. | ||
+ | idProduct 0x0001 | ||
+ | bcdDevice 0.10 | ||
+ | iManufacturer 1 | ||
+ | iProduct 2 | ||
+ | iSerial 0 | ||
+ | bNumConfigurations 1 | ||
+ | Configuration Descriptor: | ||
+ | bLength 9 | ||
+ | bDescriptorType 2 | ||
+ | wTotalLength 110 | ||
+ | bNumInterfaces 2 | ||
+ | bConfigurationValue 1 | ||
+ | iConfiguration 0 | ||
+ | bmAttributes 0x80 | ||
+ | MaxPower 500mA | ||
+ | Interface Descriptor: | ||
+ | bLength 9 | ||
+ | bDescriptorType 4 | ||
+ | bInterfaceNumber 0 | ||
+ | bAlternateSetting 0 | ||
+ | bNumEndpoints 0 | ||
+ | bInterfaceClass 1 Audio | ||
+ | bInterfaceSubClass 1 Control Device | ||
+ | bInterfaceProtocol 0 | ||
+ | iInterface 0 | ||
+ | AudioControl Interface Descriptor: | ||
+ | bLength 9 | ||
+ | bDescriptorType 36 | ||
+ | bDescriptorSubtype 1 (HEADER) | ||
+ | bcdADC 1.00 | ||
+ | wTotalLength 40 | ||
+ | bInCollection 1 | ||
+ | baInterfaceNr( 0) 1 | ||
+ | AudioControl Interface Descriptor: | ||
+ | bLength 12 | ||
+ | bDescriptorType 36 | ||
+ | bDescriptorSubtype 2 (INPUT_TERMINAL) | ||
+ | bTerminalID 1 | ||
+ | wTerminalType 0x0101 USB Streaming | ||
+ | bAssocTerminal 0 | ||
+ | bNrChannels 2 | ||
+ | wChannelConfig 0x0003 | ||
+ | Left Front (L) | ||
+ | Right Front (R) | ||
+ | iChannelNames 0 | ||
+ | iTerminal 0 | ||
+ | AudioControl Interface Descriptor: | ||
+ | bLength 10 | ||
+ | bDescriptorType 36 | ||
+ | bDescriptorSubtype 6 (FEATURE_UNIT) | ||
+ | bUnitID 13 | ||
+ | bSourceID 1 | ||
+ | bControlSize 1 | ||
+ | bmaControls( 0) 0x03 | ||
+ | Mute | ||
+ | Volume | ||
+ | bmaControls( 1) 0x00 | ||
+ | bmaControls( 2) 0x00 | ||
+ | iFeature 0 | ||
+ | AudioControl Interface Descriptor: | ||
+ | bLength 9 | ||
+ | bDescriptorType 36 | ||
+ | bDescriptorSubtype 3 (OUTPUT_TERMINAL) | ||
+ | bTerminalID 3 | ||
+ | wTerminalType 0x0301 Speaker | ||
+ | bAssocTerminal 0 | ||
+ | bSourceID 13 | ||
+ | iTerminal 0 | ||
+ | Interface Descriptor: | ||
+ | bLength 9 | ||
+ | bDescriptorType 4 | ||
+ | bInterfaceNumber 1 | ||
+ | bAlternateSetting 0 | ||
+ | bNumEndpoints 0 | ||
+ | bInterfaceClass 1 Audio | ||
+ | bInterfaceSubClass 2 Streaming | ||
+ | bInterfaceProtocol 0 | ||
+ | iInterface 0 | ||
+ | Interface Descriptor: | ||
+ | bLength 9 | ||
+ | bDescriptorType 4 | ||
+ | bInterfaceNumber 1 | ||
+ | bAlternateSetting 1 | ||
+ | bNumEndpoints 1 | ||
+ | bInterfaceClass 1 Audio | ||
+ | bInterfaceSubClass 2 Streaming | ||
+ | bInterfaceProtocol 0 | ||
+ | iInterface 0 | ||
+ | AudioStreaming Interface Descriptor: | ||
+ | bLength 7 | ||
+ | bDescriptorType 36 | ||
+ | bDescriptorSubtype 1 (AS_GENERAL) | ||
+ | bTerminalLink 1 | ||
+ | bDelay 1 frames | ||
+ | wFormatTag 1 PCM | ||
+ | AudioStreaming Interface Descriptor: | ||
+ | bLength 11 | ||
+ | bDescriptorType 36 | ||
+ | bDescriptorSubtype 2 (FORMAT_TYPE) | ||
+ | bFormatType 1 (FORMAT_TYPE_I) | ||
+ | bNrChannels 2 | ||
+ | bSubframeSize 2 | ||
+ | bBitResolution 16 | ||
+ | bSamFreqType 1 Discrete | ||
+ | tSamFreq[ 0] 48000 | ||
+ | Endpoint Descriptor: | ||
+ | bLength 9 | ||
+ | bDescriptorType 5 | ||
+ | bEndpointAddress 0x06 EP 6 OUT | ||
+ | bmAttributes 9 | ||
+ | Transfer Type Isochronous | ||
+ | Synch Type Adaptive | ||
+ | Usage Type Data | ||
+ | wMaxPacketSize 0x00c0 1x 192 bytes | ||
+ | bInterval 1 | ||
+ | bRefresh 0 | ||
+ | bSynchAddress 0 | ||
+ | AudioControl Endpoint Descriptor: | ||
+ | bLength 7 | ||
+ | bDescriptorType 37 | ||
+ | bDescriptorSubtype 1 (EP_GENERAL) | ||
+ | bmAttributes 0x00 | ||
+ | bLockDelayUnits 0 Undefined | ||
+ | wLockDelay 0 Undefined |