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hw:yoga-ad-100 [d-m-Y H:i]
hw:yoga-ad-100 [d-m-Y H:i] (current)
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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
 
 
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