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ASAHI KASEI
[AK5371A]
AK5371A
Features:
USB-IF Certified Incorporates USB Audio Controller USB Serial Interface Engine Audio Class Encoder/Decoder 2 Endpoints (FIFO) USB transceiver 16 bit A/D Converter 2 channels Mute/Volume Control A/D S/N: 84dBA (44.1kHz, Gain = 0dB) Low Power Dissipation Normal Operation: 26mA Suspend Mode: < 1uA Programmable Gain Amplifier (IPGA) +24dB to -31dB @1dB Step 20dB Pre-amplifier On-chip PLL 5 Sampling Frequencies support 8kHz, 11.025kHz 22.05kHz, 44.1kHz, 48kHz EEPROM I/F can customize Device Descriptor, and String Descriptor Single Power Supply, Low Power +3.30.3 Volts Package 48pin LQFP
2ch A/D Converter with USB I/F
General Description The AK5371A is stereo A/D converter with USB I/F. The AK5371A integrates USB serial interface engine, USB transceiver, audio class processing unit, endpoints, and high quality 2 channel AD converter into the chip. As the AK5371A incorporates PLL, it can support several sampling frequencies, 8kHz, 11.025kHz, 22.05kHz, 44.1kHz, and 48kHz with only one crystal. Moreover, the AKAK5371A integrates volume control, and mute function. Not only power consumption at normal operation is very low, but also the current at suspend mode is less than 1A. The AK5371A includes 20dB fixed gain pre-amplifier. In addition to this, as the AK5371A also incorporates IPGA which can amplify the microphone signal up to +24dB, total gain is 44dB maximum. The AK5371A has EEPROM I/F for customizing Device Descriptor and String Descriptor. By connecting 1K bit, 2K bit, or 4Kbit MicrowireTM type EEPROM, the AK5371A can customize Vendor ID, Product ID in Device Descriptor, and String Descriptor. This device is good for not only business application such as conferencing but also games, voice recognition, and Karaoke. Related Documents For the detail of USB specification, and Audio Class, please refer to the following documents. Universal Serial Bus Specification Revision 1.1 Universal Serial Bus Device Class Definition for Audio Devices, Revision 1.0
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[AK5371A]
Block Diagram
VSS2 MICBIAS VREF Common Voltage Mute & Volume control Audio Class Decoder Audio Class Encoder BIASSEL VA VREF VCOM VSS3 VD VSS1 SUSN Config/String ROM EndPoint0 OUT_FIFO EndPoint0 IN_FIFO Serial Interface Engine
Testmode1,2,3 TEST SystemCLK + adCLK
CS EEPROM Control
SK EPAO EPDI EPEN EPSEL
microwire EEPROM (1K bit)
MICR
+
20dB
AMPR1O AMPR2I MICL
+
20dB
+
16bit ADC
EndPoint1 IN_FIFO
AMPL1O AMPL2I
PLL AMPR2O LFLT1 XTLIN LFLT2
CRYSTAL
USB Transceiver XTLOUT RSTN
DP DN
AMPL2O
Ordering Guide
AK5371AVQ AKD5371 Pin Layout
EPSEL EPEN SUSN RSTN
0 +70 C Evaluation Board
48pin LQFP (0.5mm pitch)
EPDI
DN
NC
NC
NC
NC
45
NC
DP
VD VSS1 VSS2 NC TESTMODE3 XTALOUT XTALIN TESTMODE2 LFLT1 LFLT2 BIASSEL NC
1
40 35
NC EPAO SK CS
5 30
TEST NC TESTMODE1 NC VREF
10 25
VSS3 VA
15 20
NC
NC
MICBIAS VCOM
MICL
AMPL1O
AMPL2I
AMPL2O
NC
MICR
AMPR1O
AMPR2I
AMPR2O
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Pin/Function No. 1 2 3 4 5 6 7 8 9 10 11 Signal Name VD VSS1 VSS2 NC TESTMODE3 XTALOUT XTALIN TESTMODE2 LFLT1 LFLT2 BIASSEL I/O P P P I O I I O O I Ana / Dig D D D D A A A A A D Description Digital Power Supply, 3.3V Digital Ground,0V Bulk Ground, 0V No Connection Please tie down to VSS3 for normal operation. Crystal Oscillator Output, Connect Crystal Resonator Crystal Oscillator Input, Connect Crystal Resonator Please tie down to VSS3 for normal operation. adPLL loop filter Pin. Connect 51k resistor and 8200pF capacitor in series externally. System clock PLL loop filter Pin. Connect 18k resistor and 6800pF capacitor in series externally. MIC BIAS Select Pin Select MICBIAS Output "L": VA(through switch) "H": VREF buffer output No Connection No Connection Analog Common Voltage Reference Pin Voltage Reference Output for the Microphone's bias voltage When this chip goes into Suspend mode, this pin goes to Hi-Z. Left Channel Microphone Input Left Channel 1st Amplifier Output Pin Left Channel 2nd Amplifier Input Pin Left Channel 2nd Amplifier Output Pin No Connection Right Channel Microphone Input Right Channel 1st Amplifier Output Pin Right Channel 2nd Amplifier Input Pin Right Channel 2nd Amplifier Output Pin
12 13 14 15 16 17 18 19 20 21 22 23 24
NC NC VCOM MICBIAS MICL AMPL1O AMPL2I AMPL2O NC MICR AMPR1O AMPR2I AMPR2O
O O I O I O I O I O
A A A A A A A A A A
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No. 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
Signal Name NC VA VSS3 VREF NC TESTMODE1 NC TEST CS SK EPAO NC NC EPDI EPEN
I/O P P O I I/O O O O I I
Ana / Dig A A A A D D D D D D
Description No Connection Analog Power Supply, 3.3V Analog Ground,0V ADC Common Voltage Reference Pin. No Connection Please tie down to VSS3 for normal operation. No Connection Please tie down to VSS3 for normal operation. EEPROM I/F Chip Select Pin Serial Clock Pin EEPROM Address Output Pin No Connection No Connection EEPROM Data Input Pin (This pin is internally pulled down) EEPROM Enable Pin "H" : Read Device Descriptor, String Descriptor from EEPROM "L" : Read Device/String Descriptor from internal ROM. Note that CS,SK,EPDI,EPAO is Hi-Z when EPEN is "L" EEPROM Select Pin "L" : 1Kbit Type EEPROM is connected. "H" : 2Kbit/4Kbit EEPROM is connected If EEPROM is not used, EPSEL should be tied to VSS1. No Connection Suspend Status Pin "L" : Suspend State "H" : Normal Operation Reset Pin, Low input makes the chip reset sate. Schmitt Trigger input. No Connection No Connection USB bus Non-Inverting pin. Because AK5371A is full speed mode device, 1.5k resistor will be connected between D+ node to VD. USB bus Inverting Pin. No Connection
40
EPSEL
I
D
41 42 43 44 45 46
NC SUSN RSTN NC NC DP
O I I/O
D D D
47 48
DN NC
I/O -
D -
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Absolute Maximum Rating VSS1=VSS2=VSS3=0V Parameter Power Supplies Symbol Min Max Units V V mA V V C C
Analog VSS3 -0.3 4.5 Digital VSS1 -0.3 4.5 Input Current (any pins except for supplies) IIN 10 Analog Input Voltage VINA -0.3 VA+0.3 Digital Input Voltage VIND -0.3 VD+0.3 Ambient Temperature Ta 0 70 Storage Temperature Tstg -40 125 Note 1. All voltages with respect to ground. VSS1, VSS2 and VSS3 pin should be connected.
Warning: Operation at or beyond these limits may results in permanent damage to the device. Normal operation is not guaranteed at these extremes.
Recommended Operating Condition VSS1=VSS2=VSS3=0V Parameter Power Supplies Analog Digital All voltages with respect to ground. Symbol VA VD Min 3.0 3.0 typ 3.3 3.3 Max 3.6 3.6 Units V V
* AKM assumes no responsibility for the usage beyond the condition in this datasheet.
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Analog Characteristics Ta=25C,VA=VD=3.3V, Signal Frequency=1kHz, Sampling Frequency Fs=44.1kHz BW=20Hz - 20kHz, Test Mode; unless otherwise specified Parameter Min typ Max Units Stereo ADC (2 channel) Resolution 16 bits S/N (A weight) (AMPR2I/AMPL2I input) 84 dBA (IPGA are set to 0dB) USB Normal Mode S/(N+D) (-1dB analog input) 70 dB (IPGA are set to 0dB) USB Normal Mode MIC Amplifier (2nd Stage) Characteristics Full Scale Input Voltage 1.5 1.7 1.9 Vp-p Gain Control Range -31 +24 dB Step Size 0 1.0 2.0 dB Input Impedance @AMPR2I/AMPL2I pin 40 K MIC Amplifier (1st Stage) Gain range +20 dB Input Impedance @MICR/MICL 10 20 K S/N (A weight) @MICR/MICL to AMPR1O/AMPL1O 77 dBA MIC Bias (VA) 2.0 Vdc Output Voltage when 4.7K resistor connected Output Impedance 200 500 Output Current 2 mA MIC Bias (Buffer Amp) 1.9 2.2 2.5 Vdc Output Voltage when 300 resistor connected Output Current 2 mA Power Supplies Analog 17 25 mA Digital 9 15 mA Total 26 40 mA Power Down (Suspend Mode) 0 160 uA
FILTER CHARACTERISTICS
(Ta=25C VA, VD =3.0 - 3.6 V ; fs = 44.1 kHz) Parameter Symbol A/D Digital Filter (Decimation LPF) Passband +/- 0.2 dB PB Stopband SB Passband Ripple PR Stopband Attenuation SA Group Delay GD A/Ddigital Filter (HPF) Frequency Response -3 dB FR -0.5 dB -0.1 dB Min typ Max Units
0 26.5 68
17.64 +/- 0.2 0.5 6.85 19.2 44.9
KHz KHz dB dB ms Hz Hz Hz
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Digital DC Characteristics
Ta=0 - 70C; VD=3.0 - 3.6V; VSS1=0V Measurement under static state All digital pins except DP, DN. Schmitt hysteresis level of RST pin and levels of all test pins will not be tested.
Parameter EPDI, EPEN, EPSEL, pin "H" level input voltage EPDI, EPEN, EPSEL pin "L" level input voltage RSTN pin "H" level voltage RSTN pin "L" level voltage CS, SK, EPAO, SUSN pin "H" level output voltage IOH = 2mA CS, SK, EPAO, SUSN pin "L" level output voltage IOL = -2mA Input Leakage Current
Symbol VIH VIL VIHR VILR VOH VOL Iin
Min 70%VD 2.0
Typ
Max 30%VD 0.8
2.4 0.6 10
Units V V V V V V A
Switching Characteristics Ta=25C, VA=VD=3.3V Parameter Symbol Min Typ Max Master Clock Frequency MCLK 11.2896 Reset input width @RSTN pin(low active) Wrst 1.0 DP,DN Single Ended Receiver Threshold for H level VseH 2.0 for L level VseL 0.8 Time Width for USB Reset Signal Recognition*1 Trst_rec 2.7 DP VseL & DN < VseL ) to Suspend mode Resume Time from Suspend First flip of DP/DN from Idle sate Tresm 30 To Device Ready*) Device Ready: VREF, X'tal oscillator, and PLL get stable and bus transaction with normal rate is ready.
min 20ms resume time min 10ms resume recovery time
Units MHz us V s ms ms ms
VD DP DN RSTN PLL Clock
Resume
Tdrr Reset Mode
Trst_rec
Device Connected
Figure 1. Mode change with respect to BUS States 1 (Power on and device connected)
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Tsus_rec
VD"H" D+ DRST"H" PLL Clock Tresm
Figure 2. Mode Change with respect to Bus States 2 (Bus transactions)
Transmitter Characteristics Ta=25C; VD=3.3V; VSS1=0V; CL=50pF Parameter Symbol Data Rate DR Output Impedance (Hi) Output Impedance (Lo) "H" level Output Voltage "L" level Output Voltage Tri-state Leakage Current Rise/Fall Time Rise/Fall Time Matching Crossover Point Roh Rol Vohd Vold Iolk Trf/Tff Trfm Vcrs Pins DP,DN DP, DN DP, DP DP, DN DP, DN DP, DN DP, DN DP, DN DP, DN Conditions DP, DN="H" at Iout = -10mA DP, DN="L" at Iout = 10mA at Iout =-200uA at Iout =2.2mA 0 < DP, DN< 3.3V Min 11.97 Typ 12 36 36 2.8 -10 4 0.3 10 20 Max 12.03 Units MHz V V A ns % V
10 100 1.65
Trf DP, DN
Trs
Tff
Tfs 90%VD 10%VD
Figure 3. Rise/Fall Time
DP, DN
Vcrs
Figure 4. Crossover Point
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Receiver Characteristics Ta=25C; VD=3.3V; VSS1=0V Parameter Common Mode Range Differential Input Sensitivity Schmitt High Level Voltage Schmitt Low Level Voltage Symbol CMR DIS Vihs Vils Pins DP, DN DP, DN DP, DN DP, DN Conditions Min 0.8 200 2.0 Typ Max Units V mV V V
0.8
DP, DN
Vihs Vils
Figure 5. Schmitt Level Voltage
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Overview of AK5371A The AK5371A is the advanced stereo A/D converter, which converts analog signal into USB audio class formats. As the AK5371A incorporates all functions to build USB Audio Input Device, the AK5371A doesn't require additional micro-controller, memory, and a transceiver. Moreover, as the AK5371A also has 20dB fixed gain pre-amplifier in addition to programmable gain amplifier (IPGA) whose range is from +24dB to -31dB, this device is suitable for USB microphone, especially microphone array. USB microphone can be manufactured easily by only four main components; the AK5371A, one crystal, one regulator, and microphone unit(s). As the AK5371A also has EEPROM interface, descriptors can be customized easily. The AK5371A includes the following blocks: 1. 2 channel 16bit A/D converter a) 84dBA@fs=44.1kHz Programmable Gain Amplifier (IPGA) a) Gain Range: from +24dB to -31dB, b) Gain Step: 1dB/step Fixed Gain Preamplifier a) 20dB FIFO Synchronization between A/D converter and USB bus a) Memory Size 400 bytes (16bit wide x 100 depth x 2 channel) PLL a) b)
2.
3.
4.
5.
11.2896MHz crystal Two PLLs - A/D_PLL: generate clock for fs=8kHz, 48kHz - System_PLL : generate USB system clock
6.
Audio Format a) supports 5 frequencies : 8kHz, 11.025kHz, 22.05kHz, 44.1kHz, 48kHz b) 2 audio formats - mono 16bit LSB first - stereo 16bit LSB first USB Serial Interface Engine a) Process USB Standard Requests Control block of Audio Device Class a) Translate internal A/D format to USB audio class format b) Process USB Audio Class Request - Mute - Gain/Attenuation - Sampling Frequency Control USB transceiver EEPROM I/F MicrowireTM (4-wire) type EEPROM can be used to customize Device/String Descriptor. - 1K bit (AK93C45A) - 2K bit (AK93C55A) - 4Kbit (AK93C65A) USB Suspend/Resume Support
7.
8.
9. 10.
11.
The AK5371A supports 5 sampling frequencies (8kHz, 11.025kHz, 22.05kHz, 44.1kHz, 48kHz). In order to support these frequencies, the AK5371A incorporates PLL, which generates system clock and master clock for fs=8kHz, and 48kHz Mute, volume and audio format including sampling frequency are controlled by USB audio class request. The AK5371A goes to suspend mode when the device doesn't receive SOF for the period more than 3ms. All blocks including master clock stop the function to observe USB specification, 500A , until receiving the resume signal. The AK5371A notifies the current state (normal state or suspend state) by SUS_N pin. As the AK5371A has MicrowireTM EEPROM I/F, the vendors can customize iManifacterer, iProduct, and the related strings to their own ID, and string.
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[AK5371A]
Descriptor Overview When the device is connected to USB bus, the host assigns specific address to the device. Then the host reads the device information, which is called as descriptor, through default pipe (Endpoint 0). The AK5371A consists of one Device Descriptor, one Configuration Descriptor, two Interface Descriptors, and two Endpoint Descriptors. Figure 6 shows Descriptor's hierarchy.
Device
Device Descriptor
Configuration
Configuration Descriptor
Standard Audio Control Interface Descriptor
Standard AS Interface Descriptor Alt. Setting 0
Standard AS Interface Descriptor Alt. Setting 1
Standard AS Interface Descriptor Alt. Setting 2
Class-Specific Audio Control Interface Descriptor
Class-Specific Audio Streaming Interface Descriptor
Class-Specific Audio Streaming Interface Descriptor
Interface 0
Interface 1
Class-Specific AS Format Type Descriptor
Class-Specific AS Format Type Descriptor
Standard AS Isochronous Endpoint Descriptor Class-Specific Descriptor Class-Specific AS Isochronous Endpoint Descriptor
Standard AS Isochronous Endpoint Descriptor
StandardInterface Descriptor
Class-Specific AS Isochronous Endpoint Descriptor
Endpoint (IN)
Figure 6. Descriptor Hierarchy
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Audio Format of the AK5371A The AK5371A supports two audio formats: 16bit/mono and 16bit/stereo. This feature can avoid the unnecessary occupation of USB bandwidth. 16bit/mono is assigned to , 16bit/stereo is assigned to . The A/D data on USB bus is LSB first, Left channel first. When 16bit/mono audio format is selected, the AK5371A outputs left channel data on the USB bus. Audio format is changed by "Set Interface" Request. Synchronization The AK5371A operates as Asynchronous Device. A/D converter in the AK5371A operates asynchronously with USB SOF timing. The data from A/D converter are sent continuously to a buffer memory while the data are burstly transferred at the interval of SOF on the USB. In order to arbitrate the difference of timing, AK5371A has a FIFO memory with a capacity of 2-frame depth .The average sampling rate calculating from USB frame should be in accordance with A/D sampling rate (fs). The AK5371A sends all A/D samples that were stored in the last frame to avoid overflow or underflow of FIFO. The following figure shows an example. When sampling frequency is set to 44.1kHz, the AK5371A sends 45 samples once per ten times, and sends 44 samples in other frames. Average frequency is 44.1kHz. See Figure 7.
N Frame
(N+1) Frame
(N+9) Frame
(N+10) Frame
44 samples
44 samples
45 samples
44 samples
Figure 7. Synchronization
Power Management Control When idle state continues for 3ms, the AK5371A goes to suspend state and forces almost all blocks including PLL, ADC block and mic bias into stopping in order to observe 500A, which is USB suspend current requirement. The device resumes the normal operation within 30ms after the device receives resume signal. In the normal operation, MICBIAS outputs the voltage to supply the microphone's bias voltage. SUSN pin shows USB bus status; suspend mode ("L") or normal operation ("H"). SUSN pin can be used for external power control. The AK5371A is very low power device at both normal state and suspend state. However, note that USB suspend current requirement, 500A, specifies the current which is totally consumed by not only the AK5371A, by also regulator(s), and resistors. Therefore, low power regulator should be selected to design USB microphone. Feature Unit Control & Frequency Control When the AK5371A receives "SET_FEATURE_UNIT_CONTROL" request, the device decodes the request and sets the value. Note that only CUR value is valid for "SET_FEATURE_UNIT_CONTROL" request, and that MIN/MAX/RES value is invalid. When the AK5371A receives "GET_FEATURE_UNIT_CONTROL" request, the device decodes the request and returns the value to the host. CUR/MAX/MIN/RES value is valid for "Get Volume Request", but only CUR value is meaningful for "Get Mute Request". When the AK5371A receives "SET_ENDPOINT_CONTROL" request, it changes sampling frequency(fs). If fs is not supported, the device forces to set the appropriate fs which it supports. When the AK5371A receives "GET_ENDPOINT_CONTROL" request, it sends back the current value to the host.
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[AK5371A]
EEPROM I/F The AK5371A has EEPROM I/F for customizing Device Descriptor, and String Descriptor. idVendor(2byte), idProduct(2byte), bcdDevice(2byte), iManufacturer(1byte), iProduct(1byte) in Device Descriptor and related String Descriptor can be customized. MicrowireTM type, 1K bit, 2K bit, or 4K bit EEPROM can be used. Note that word length of iManufacterer and iProduct is fixed to 52 bytes each for 1K bit EEPROM, 102 bytes for 2K/4K bit EEPROM. The AK5371A automatically reads Device Descriptor from the EEPROM and stores internal memory after USB reset. When the AK5371A receives "GET String Descriptor" request, the AK5371A starts reading from EEPROM. The AK5371A continues to send NAK packet while it is reading String from EEPROM. Memory mapping of EEPROM is the following. 1K bit (AK93C45A) 00h - 08h 09h - 0Ah 0Bh - 24h 25h - 3Eh 2K/4K bit (AK93C55A / 65A) 00h - 08h 09h - 0Ah 0Bh - 3Dh 3Eh - 71h
Device Descriptor (18 bytes) String Descriptor Lang ID (4 bytes index = 0) String Descriptor iManufacturer (52 or 102bytes index =1) String Descriptor iProduct (52 or 102 bytes index = 2) Note that EEPROM address is 16bit boundary.
If 2K/4K bit EEPROM is used, EPSEL pin should be tied to VD. if 1K bit EEPROM is connected to the device, EPSEL should be tied to VSS1. Device Descriptor and String Descriptor should be stored in EEPROM before the AK5371A is powered up. EPEN pin should be tied to "H" to activate if Descriptors are read from external EEPROM. If internal ROM is used, not only EPEN pin but also EPSEL pin should be tied to VSS1. Note that CS pin, SK pin, and EPAO pin are Hi-Z state when EPEN is "L". EPDI pin is internally pulled down.
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System Block Diagram The following figure shows the system connection diagram. This is an example which uses external 1K bit EEPROM (AK93C45A) as Device and String Descriptor. If EEPROM is not used, EPEN pin should be tied to VSS1. Ceramic capacitors (0.1uF) for VA pin, VD pin, VREF pin and VCOM pin should be located as near as possible.
This drawing does NOT mean physical pin locations/ordering
10 0.1u R1:4.7k 0.1u 4.7u 0.1u 4.7u 0.1u 100u R1:4.7k 0.1u R0 100u
VCOM VREF MICBIAS
10uH Regulator 10u
0.1u 4.7u
0.1u 4.7u
VD VSS1 RSTN CS SK EPAO EPDI Testmode 1 Testmode 2 Testmode 3 Test DP
0.1u 56k 10u 3300p
EEPROM
VA VSS3 VSS2
C1:1.0u< C2:0.33u
MICR AMPR1O AMPR2I MICL AMPL1O AMPL2I AMP2RO AMP2LO
Phone Jack
C1:1.0u<
1.5k D+ D1M
STEREO SW C2:0.33u
DN LFLT1,2 XTALOUT XTALIN
To Host/Hub GND
51k C3:1000p C3:1000p 8200p
18k 6800p Cd
11.2896M Cd
5V GND
VSS1 VSS3
C1 is specified for lower end cut-off frequency C3 forms Anti-aliasing filter in conjuction with the internal resistor at AMPR2O/AMPL2O R0: 0 resister when BIASSEL is Low. 330 resister when BIASSEL is High Cd: Please select the appropriate value according to crystal resonator's characteristics
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AK5371A Descriptors Specification
1 Device descriptor
Offset 0 1 2 4 5 6 7 8 10 12 14 15 16 17 Field bLength bDescriptorType bcdUSB bDeviceClass bDeviceSubClass bDeviceProtocol bMaxPacketSize0 idVendor idProduct bcdDevice iManufacturer iProduct iSerialNumber bNumConfigurations Size 1 1 2 1 1 1 1 2 2 2 1 1 1 1 Value 0x12 0x01 0x0110 0x00 0x00 0x00 0x08 0x0556 0x0002 0x0001 0x01 0x02 0x00 0x01 Description Size of this descriptor in bytes DEVICE descriptor 1.10 - current revision of USB spec. Device defined at Interface level Unused Unused 8 bytes AKM's Vendor ID 00 means Audio Product, 02 is AKMproduct ID , Device release code "AKM" "AK5371" Unused One configuration
2 Configuration Descriptor
The configuration block consists of a configuration descriptor followed by interface, endpoint, and class-specific descriptors. Offset Field Size Value Description 0 bLength 1 0x09 Size of this descriptor 1 bDescriptorType 1 0x02 CONFIGURATION descriptor 2 wTotalLength 2 0x00B1 Length of entire configuration block Total 177 bytes including this interface descriptor. Two interfaces 4 bNumInterfaces 1 0x02 5 bConfigurationValue 1 0x01 Index of this configuration 6 iConfiguration 1 0x00 Null string 7 bmAttributes 1 0x80 Bus Powered Device 8 MaxPower 1 0x2D Power consumption: 90mA
3 Interface Descriptor
3.1 Standard Audio Control Interface descriptor
3.1.1 This descriptor describes a standard interface which includes USB class code and the index to class-specific information. Offset Field Size Value Description 0 bLength 1 0x09 Size of this descriptor 1 bDescriptorType 1 0x04 INTERFACE descriptor 2 bInterfaceNumber 1 0x00 Index of this interface 3 bAlternateSetting 1 0x00 Index of this setting 4 bNumEndpoints 1 0x00 Endpoint 0 5 bInterfaceClass 1 0x01 AUDIO 6 bInterfaceSubclass 1 0x01 AUDIO_CONTROL 7 bInterfaceProtocol 1 0x00 Unused 8 iInterface 1 0x00 null string
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3.2 Class-specific Audio Control Interface 3.3 Class-specific Audio Control Interface Header Descriptor
3.3.1 Offset 0 1 2 3 5 7 8 Contains general information about the audio device. Field Size Value Description bLength 1 0x09 Size of this descriptor bDescriptorType 1 0x24 CS_INTERFACE bDescriptorSubtype 1 0x01 HEADER subtype bcdADC 2 0x0100 Revision of class specification - 1.0 wTotalLength 2 0x0028 Total size of class-specific Audio Control Interface descriptors (includes this descriptor) bInCollection 1 0x01 Number of streaming interfaces baInterfaceNr(1) 1 0x01 Streaming interface number 1 belongs to this audio control interface.
3.3.2 Input terminal descriptor This descriptor describes the signal coming through the input port NumChannels is 1(monaural) and ChannelConfig is set no position. Terminal type is Microphone. Offset Field Size Value Description 0 bLength 1 0x0C Size of this descriptor 1 bDescriptorType 1 0x24 CS_INTERFACE 2 bDescriptorSubtype 1 0x02 INPUT_TERMINAL subtype 3 bTerminalID 1 0x01 ID of this terminal 4 wTerminalType 2 0x0201 Terminal is Microphone 6 bAssocTerminal 1 0x02 ID of associated Output Terminal is 0x02 7 bNrChannels 1 0x02 Two channels (Stereo) 8 wChannelConfig 2 0x0003 Left/Right Front 10 iChannelNames 1 0x00 Unused 11 iTerminal 1 0x00 Unused Output terminal descriptor 3.3.3 This descriptor describes the USB stream to host. Offset Field Size Value 0 bLength 1 0x09 1 bDescriptorType 1 0x24 2 bDescriptorSubtype 1 0x03 3 bTerminalID 1 0x02 4 wTerminalType 2 0x0101 6 bAssocTerminal 1 0x01 7 bSourceID 1 0x03 8 iTerminal 1 0x00 3.3.4 Offset 0 1 2 3 4 5 6 7 8 9 Feature Unit descriptor Field bLength bDescriptorType bDescriptorSubtype bUnitID bSourceID bControlSize Size 1 1 1 1 1 1 Value 0x0A 0x24 0x06 0x03 0x01 0x01 Description Size of this descriptor CS_INTERFACE FEATURE_UNIT descriptor subtype ID of this feature Unit ID to Terminal to which this is connected. Size in bytes of an element of the bmaControl() D0(Mute) is enable for Channel 0 D1(Volume) is enable for ch 1(Left) D1(Volume) is enable for ch 2 (Right) Unused
Description Size of this descriptor CS_INTERFACE OUTPUT_TERMINAL subtype ID of this terminal USB Streamer ID of associate Input Terminal is 0x01 From Feature Unit Unused
bmaControls(0) 1 0x01 bmaControls(1) 1 0x02 bmaControls(2) 1 0x02 iFeature 1 0x00 Note that there is never endpoint descriptor for endpoint 0.
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[AK5371A]
3.4 Audio streaming interface
3.4.1 Offset 0 1 2 3 4 5 6 7 8 3.4.2 Offset 0 1 2 3 4 5 6 7 8 3.4.3 Offset 0 1 2 3 4 5 3.4.4 Offset 0 1 2 3 4 5 6 7 8 11 14 17 20 Zero bandwidth interface descriptor Field Size Value bLength 1 0x09 bDescriptorType 1 0x04 bInterfaceNumber 1 0x01 bAlternateSetting 1 0x00 bNumEndpoints 1 0x00 bInterfaceClass 1 0x01 bInterfaceSubclass 1 0x02 bInterfaceProtocol 1 0x00 iInterface 1 0x00 Interface descriptor(Alt = 1, 16bit Mono) Field Size Value bLength 1 0x09 bDescriptorType 1 0x04 bInterfaceNumber 1 0x01 bAlternateSetting 1 0x01 bNumEndpoints 1 0x01 bInterfaceClass 1 0x01 bInterfaceSubclass 1 0x02 bInterfaceProtocol 1 0x00 iInterface 1 0x00 Class-specific audio streaming interface descriptor Field Size Value bLength 1 0x07 bDescriptorType 1 0x24 bDescriptorSubtype 1 0x01 bTerminalLink 1 0x02 bDelay 1 0x01 wFormatTag 2 0x0001 Type I format type descriptor Field Size blength 1 bDescriptorType bdescriptorSubtype bformatType bNrChannels bSubFrameSize bBitResolution bSamFreqType tSamFreq[0] tSamFreq[1] tSamFreq[2] tSamFreq[3] tSamFreq[4] 1 1 1 1 1 1 1 3 3 3 3 3 Description Length of this descriptor INTERFACE descriptor Index of this interface Index of this setting Endpoints 0 AUDIO AUDIO_STREAMING Unused null string
Description Length of this descriptor INTERFACE descriptor Index of this interface Index of this setting Endpoint 1 AUDIO AUDIO_STREAMING Unused null string
Description Length of this descriptor CS_INTERFACE descriptor AS_GENERAL Unit ID of terminal(Output Terminal ID) Interface delay PCM
Value 0x17 0x24 0x02 0x01 0x01 0x02 0x10 0x05 0x001F40 0x002B11 0x005622 0x00AC44 0x00BB80
Description Size of this descriptor CS_INTERFACE FORMAT_TYPE FORMAT_TYPE_I One channel Two bytes per slot 16 bits Five frequencies 8000Hz 11025Hz 22050Hz 44100Hz 48000Hz
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[AK5371A]
3.5 Endpoint descriptor
3.5.1 Offset 0 1 2 3 4 6 7 8 3.5.2 Offset 0 1 2 3 4 5 Standard Endpoint Descriptor Field Size bLength 1 bDescriptorType 1 bendpointAddress 1 bmAttributes 1 wMaxPacketSize 2 wInterval 1 bRefresh 1 bSynchAddress 1 Value 0x09 0x05 0x81 0x05 0x0064 0x01 0x00 0x00 Description Length of this descriptor ENDPOINT descriptor Endpoint 1, IN direction Isochronous, asynchronous, not shared 2byte*50sample*1ch=100 byte/frame One packet every frame (Must be set to 1)
Class-specific isochronous audio data endpoint descriptor Field Size Value Description bLength 1 0x07 Size of this descriptor bDescriptorType 1 0x25 CS_ENDPOINT bDescriptorSubtype 1 0x01 GENERAL bmAttributes 1 0x01 Sample rate control bLockDelayUnits 1 0x00 Unused wLockDelay 2 0x0000
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ASAHI KASEI 3.5.3 Offset 0 1 2 3 4 5 6 7 8 3.5.4 Offset 0 1 2 3 4 5 3.5.5 Offset 0 1 2 3 4 5 6 7 8 11 14 17 20 Interface descriptor (Alt = 2, 16bit Stereo) Field Size Value bLength 1 0x09 bDescriptorType 1 0x04 bInterfaceNumber 1 0x01 bAlternateSetting 1 0x02 bNumEndpoints 1 0x01 bInterfaceClass 1 0x01 bInterfaceSubclass 1 0x02 bInterfaceProtocol 1 0x00 iInterface 1 0x00 Class-specific audio streaming interface descriptor Field Size Value bLength 1 0x07 bDescriptorType 1 0x24 bDescriptorSubtype 1 0x01 bTerminalLink 1 0x02 bDelay 1 0x01 wFormatTag 2 0x0001 Type I format type descriptor Field Size blength 1 bDescriptorType bdescriptorSubtype bformatType bNrChannels bSubFrameSize bBitResolution bSamFreqType tSamFreq[0] tSamFreq[1] tSamFreq[2] tSamFreq[3] tSamFreq[4] 1 1 1 1 1 1 1 3 3 3 3 3
[AK5371A]
Description Length of this descriptor INTERFACE descriptor Index of this interface Index of this setting Endpoint 1 AUDIO AUDIO_STREAMING Unused null string
Description Length of this descriptor CS_INTERFACE descriptor AS_GENERAL Unit ID of terminal(Output Terminal ID) Interface delay PCM
Value 0x17 0x24 0x02 0x01 0x02 0x02 0x10 0x05 0x001F40 0x002B11 0x005622 0x00AC44 0x00BB80
Description Size of this descriptor CS_INTERFACE FORMAT_TYPE FORMAT_TYPE_I Two channel Two bytes per slot 16 bits Five frequencies 8000Hz 11025Hz 22050Hz 44100Hz 48000Hz
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ASAHI KASEI
[AK5371A]
3.6 Endpoint descriptor
3.6.1 Offset 0 1 2 3 4 6 7 8 3.6.2 Offset 0 1 2 3 4 5 Standard Endpoint Descriptor Field Size bLength 1 bDescriptorType 1 bendpointAddress 1 bmAttributes 1 wMaxPacketSize 2 wInterval 1 bRefresh 1 bSynchAddress 1 Value 0x09 0x05 0x81 0x05 0x00C8 0x01 0x00 0x00 Description Length of this descriptor ENDPOINT descriptor Endpoint 1, IN direction Isochronous, asynchronous, not shared 2byte*50sample*2ch=200 byte/frame One packet every frame (Must be set to 1)
Class-specific isochronous audio data endpoint descriptor Field Size Value Description bLength 1 0x07 Size of this descriptor bDescriptorType 1 0x25 CS_ENDPOINT bDescriptorSubtype 1 0x01 GENERAL bmAttributes 1 0x01 Sample rate control bLockDelayUnits 1 0x00 Unused wLockDelay 2 0x0000
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[AK5371A]
3.7 String descriptor 1
String descriptors use UNICODE. except for LANGID. 3.7.1 Offset 0 1 2 3.7.2 Offset 0 1 2 LANGID (0x00) Field Field bLength bDescriptorType bString
Size 1 1 2
Value 0x04 0x03 0x0409
Description Length of this descriptor STRING descriptor "English(US)"
iManufacterer (0x01) Field in Device Descriptor Field Size Value bLength 1 0x34 bdescriptorType 1 0x03 bString 50 0x0041 0x004B 0x004D 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020
Description Length of this descriptor STRING descriptor "AKM "
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ASAHI KASEI 3.7.3 Offset 0 1 2 iProduct (0x02) Field in Device Descriptor Field Size Value bLength 1 0x34 bDescriptorType 1 0x03 bString 50 0x0041 0x004B 0x0035 0x0033 0x0037 0x0031 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020 0x0020
[AK5371A]
Description Length of this descriptor STRING descriptor "AK5371 "
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ASAHI KASEI
[AK5371A]
4 Standard requests
4.1 Clear Feature
The AK5371A accepts "Clear Feature" request without stall. Though this request does not influence to the operation of the device, the AK5371A does not support this request.
4.2 Get Configuration
The AK5371A returns Configuration value. Field Size Value Offset 0 bmRequestType 1 0x80 1 bRequest 1 0x08 2 wValue 2 0x0000 4 wIndex 2 0x0000 6 wLength 2 0x0001 Description
GET_CONFIGURATION
AKM USB Mic. has one configuration.
4.3 Get Descriptor
Offset 0 1 2 Field bmRequestType bRequest wValue Size 1 1 2 Value 0x80 0x06 0xZZZZ Description GET_DESCRIPTOR ZZZZ is assigned by host: High Byte is Descriptor Type, Low Byte is Index. DEVICE : 0x0100 : (Index is 0 only) CONFIGURATION : 0x0200 STRING: 0x03??(?? is 00, 01, 02) if wValue is DEVICE or CONFIGURATION, wIndex is zero. If wValue is 0x0300(LANGID), wIndex is zero. If wValue is 0x0301 or 0x0302, wIndex is 0x0409"English(US)". Descriptor Length (ZZZZ is assigned by host)
4
wIndex
2
0x0000
6
wLength
2
0xZZZZ
4.4 Get Interface
The AK5371A returns the current bAlternateSetting value. Offset Field Size Value Description 0 bmRequestType 1 0x81 1 bRequest 1 0x0A GET_INTERFACE 2 wValue 2 0x0000 ZERO 4 wIndex 2 0x0000 Audio Control Interface 0x0001 Audio Streaming Interface 6 wLength 2 0x0001 AKM USB Mic. Has zero bandwidth Audio Streaming Interface and normal Audio Streaming Interface.
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[AK5371A]
4.5 Get Status
Offset 0 1 2 4 Field bmRequestType bRequest wValue wIndex Size 1 1 2 2 Value 0x80 0x81 0x82 0x00 0x0000 0x0000 0x0000 0x0001 0x0000 0x0081 0x0002 Description DEVICE INTERFACE ENDPOINT GET_STATUS ZERO bmRequestType is DEVICE bmRequestType is Audio Control Interface bmRequestType is Audio Streaming Interface bmRequestType is Audio Control Endpoint bmRequestType is Audio Streaming Endpoint
6
wLength
2
The AKM USB MIC returns the following status. a)Device : 0x0000( AKM USB MIC is bus-powered device) b)Interface: 0x0000 (All Zero) c)Endpoint : 0x0000
4.6 Set Address
AKM USB MIC stores the wValue in the internal returns ACK. Offset Field Size Value 0 bmRequestType 1 0x00 1 bRequest 1 0x05 2 wValue 2 0xZZZZ 4 wIndex 2 0x0000 6 wLength 2 0x0000 memory as Device Address. In addition to this, the device Description Zero SET_ADDRESS Device Address : ZZZZ is assigned by host Zero Zero
4.7 Set Configuration
AKM USB MIC is placed to configured state only wValue of this request is 0x0001. In addition to this, the device returns ACK. Offset Field Size Value Description 0 bmRequestType 1 0x00 Zero 1 bRequest 1 0x09 SET_CONFIGURATION 2 wValue 2 0x0000 Unconfigured State 0x0001 AKM USB MIC is set to configured state others Invalid 4 wIndex 2 0x0000 Zero 6 wLength 2 0x0000 Zero
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[AK5371A]
4.8 Set Feature
The AK5371A accepts "Set Feature" request without stall. However note that the AK5371A does not support this request.
4.9 Set Interface
Audio format can be changed by the combination of Interface Number and Alternate Setting. Only 0x0000 is valid if wIndex is 0x0000 Offset Field Size Value Description 0 bmRequestType 1 0x01 ONE D7 0 = Host to device D6..5 0 = Standard request D4..0 1 = Recipient is interface 1 bRequest 1 0x0B SET_INTERFACE 2 wValue 2 Alternate Setting 0x0000 Control Interface or Zero Bandwidth 0x0001 16bit Mono 0x0002 16bit Stereo 4 wIndex 2 0x0000 Audio Control Interface 0x0001 Audio Streaming Interface 6 wLength 2 0x0000 Zero
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[AK5371A]
5 Device specific Requests
AKM USB Microphone supports ONLY SET_CUR as bRequest field in Set Request Values.
5.1 Audio Control Request
AKM USB microphone support ONLY Feature Unit Control Request, not support other requests. Addition to this, it only supports SET_CUR value as bRequest field in Set Feature Unit Control Request Values. All Audio Control Requests are applied to channel 0,1,2, which means master , left and right channel. 5.1.1 Set Feature Unit Control Request AKM USB Microphone supports only one form of parameter block. Mute control is applied to master channel (channel 0) a) Mute Control Offset Field Size Value Description 0 bmRequestType 1 0x21 1 bRequest 1 0x01 SET_CUR 2 wValue 2 0x0100 MUTE_CONTROL | CHANNEL_0 4 wIndex 2 0x0300 Upper Byte : bUnit ID field in Feature Unit Descriptor.(0x03) Lower Byte : Audio Control Interface(0x00) 6 wLength 2 0x0001 The Length of Mute Control Parameter Block The parameter block of mute control is the following. Offset Field Size Value Description 0 bMute 1 0x01 TRUE 0x00 FALSE a) Volume Control Left (channel 1) volume and right (channel 2) volume are controlled independently. Offset Field Size Value Description 0 bmRequestType 1 0x21 1 bRequest 1 0x01 SET_CUR 2 wValue 2 0x0201 VOLUME_CONTROL | CHANNEL_1 0x0202 VOLUME_CONTROL | CHANNEL_2 4 wIndex 2 0x0300 Upper Byte : bUnit ID field in Feature Unit Descriptor.(0x03) Lower Byte : Audio Control Interface(0x00) 6 wLength 2 0x0002 Volume Control The parameter block of mute control is the following. Offset Field Size Value Description 0 wVolume 2 0xZZZZ The value is mapped to the volume register value. (refer to Table 1 conversion table ) ZZZZ is assigned by the host If the wVolume exceeds the range, the AK5371A forces the value into the range. Please see the conversion table in the Get Feature Unit Control Request.
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[AK5371A]
5.1.2 Get Feature Unit Control Request AKM USB Microphone supports only one form of parameter block. a) Mute Control Offset Field Size Value Description 0 bmRequestType 1 0xA1 1 bRequest 1 0x81 GET_CUR 2 wValue 2 0x0100 MUTE_CONTROL | CHANNEL_0 4 wIndex 2 0x0300 Upper Byte : bUnit ID field in Feature Unit Descriptor.(0x03) Lower Byte : Audio Control Interface(0x00) 6 wLength 2 0x0001 The Length of Mute Control Parameter Block The device outputs the current setting of mute status. Offset Field Size Value Description 0 bMute 1 0x01 TRUE 0x00 FALSE b) Volume Control Offset Field 0 bmRequestType 1 bRequest
Size 1 1
2 4 6
wValue wIndex wLength
2 2 2
Value 0xA1 0x81 0x82 0x83 0x84 0x0201 0x0202 0x0300 0x0002
Description GET_CUR GET_MIN GET_MAX GET_RES VOLUME_CONTROL | CHANNEL_1 VOLUME_CONTROL | CHANNEL_2 Upper Byte : bUnit ID field in Feature Unit Descriptor.(0x03) Lower Byte : Audio Control Interface(0x00) Volume Control
The parameter block of Volume Control is the following. Offset Field Size Value Description 0 wVolume 2 0xZZYY bRequest = GET_CUR : returns current volume. YY must be 00h 0xE100 bRequest = GET_MIN : -31dB 0x1800 bRequest = GET_MAX : +24dB 0x0100 bRequest = GET_RES : 1.0dB Table 1 is the conversion map of USB class and internal volume register. When host requests the volume value which is larger than the MAX value in the device, the device is set the MAX value to the volume. When host requests the volume value which is smaller than the MIN value in the device, the device is set the MIN value to the volume. RES value is 1.0dB.
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[AK5371A]
Field wVolume 0x7FFF -------0x1800 0x17FF --------0x1701 0x1700 0x16FF --------0x1201 0x1200 ----------------0x02FF --------0x0201 0x0200 0x01FF --------0x0101 0x0100 0x00FF --------0x0001 0x0000 0xFFFF -------0xFF01 0xFF00 0xFEFF -------0xFE01 0xFE00 ----------------0xE200 0xE1FF --------0xE101 0xE100 0xE1FF --------0x8000
Internal Value 0x1800 -----0x1800 0x1700 -----0x1700 0x1700 0x1600 -----0x1200 0x1200 ----------------0x0200 --------0x0200 0x0200 0x0100 --------0x0100 0x0100 0x0000 --------0x0000 0x0000 0xFF00 -------0xFF00 0xFF00 0xFE00 -------0xFE00 0xFE00 ----------------0xE200 0xE100 --------0xE100 0xE100 0xE100 0xE100
value 24.0000 --------24.0000 23.0000 -------23.0000 23.0000 22.0000 -------18.0000 18.0000 --------------2.0000 -------2.0000 2.0000 1.0000 --------1.0000 1.0000 0.0000 --------0.0000 0.0000 -1.0000 --------1.0000 -1.0000 -2.0000 --------2.0000 -2.0000 -----------------30.0000 -31.0000 ---------31.0000 -31.0000 -31.0000 ---------31.0000
Step
1.0dB
Table 1 Conversion Table of Volume Control
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5.2 Endpoint Control Request
The AK5371A supports five sampling frequencies. The sampling rate is changed when "Set Endpoint Control Request " is issued. SET_CUR, GET_CUR of bRequest is only supported. GET_MIN, GET_ MAX, and GET_RES of bRequest are not supported. 5.2.1 Offset 0 1 2 4 6 Set Endpoint Control Request Field bmRequestType bRequest wValue wIndex wLength Size 1 1 2 2 2 Value 0x22 0x01 0x0100 0x0081 0x0003 Description SET_CUR Upper byte: SAMPLING_FREQ_CONTROL (0x01) Lower byte : zero Upper Byte : zero Lower Byte : Endpoint Address (0x81) The Length of Sampling Frequency Parameter Block
The parameter block of mute control is the following. Offset Field Size Value Description 0 iSampleFreq 3 0xYYYYYY The following five values are valid. Others are invalid. 0x001F40 : 8kHz 0x002B11 : 11.025kHz 0x005622 : 22.05kHz 0x00AC44 : 44.1kHz(default) 0x00BB80 : 48kHz If the iSampleFreq is different from the above values, the AK5371A forces sampling frequency to the appropriate value. 5.2.2 Offset 0 1 2 4 6 Get Endpoint Control Request Field bmRequestType bRequest wValue wIndex wLength Size 1 1 2 2 2 Value 0xA2 0x81 0x0100 0x0081 0x0003 Description GET_CUR Upper byte: SAMPLING_FREQ_CONTROL (0x01) Lower byte : zero Upper Byte : zero Lower Byte : Endpoint Address (0x81) The Length of Sampling Frequency Parameter Block
The parameter block of mute control is the following. Offset Field Size Value Description 0 iSampleFreq 3 0xYYYYYY The following five values are valid. invalid. 0x001F40 : 8kHz 0x002B11 : 11.025kHz 0x005622 : 22.05kHz 0x00AC44 : 44.1kHz 0x00BB80 : 48kHz
Others are
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ASAHI KASEI [AK5371A]
Package (AK5371AVQ)
48pin LQFP(Unit:mm)
9.0 0.2 7.0 36 37
12
1.70Max 0.10 0.07 25 24 9.0 0.2 1.4TYP
48 1 0.19 0.05 12
13
7.0
0.17 0.05 0.5 0.10 M
0 10
0.10
0.5 0.2
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ASAHI KASEI [AK5371A]
Marking (AK5371AVQ)
AK5371AVQ XXXXXXX
1
1) Pin #1 indication 2) Date Code: XXXXXXX (7 digits) 3) Marking Code: AK5371AVQ 4) Asahi Kasei Logo
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ASAHI KASEI [AK5371A]
IMPORTANT NOTICE * These products and their specifications are subject to change without notice. Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd. (AKM) sales office or authorized distributor concerning their current status. * AKM assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. * Any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange, or strategic materials. * AKM products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and AKM assumes no responsibility relating to any such use, except with the express written consent of the Representative Director of AKM. As used here: (a) A hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or other fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. (b)A critical component is one whose failure to function or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. * It is the responsibility of the buyer or distributor of an AKM product who distributes, disposes of, or otherwise places the product with a third party to notify that party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold AKM harmless from any and all claims arising from the use of said product in the absence of such notification.
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