Data Sheet
USB Audio Controller
SN11220ACF
I. Description
SONiX
SN11220ACF is an USB audio controller designed especially for voice-band
and DECT phone CODEC. It supports 8 different sampling rates, 8KHz, 11.025KHz,
16KHz, 22.05KHz, 24KHz, 32KHz, 44.1KHz and 48KHz in playback and recording.
These 8 frequencies are selectable by setting the three external pins.
II. Features
8KHz, 11.025KHz, 16KHz, 22.05KHz, 24KHz, 32KHz, 44.1KHz and 48KHz
sampling rates for 2 channels playback and recording
Full-duplex playback/ recording audio stream without sound card in PC
Compatible with Win98 SE/ WinME/ Win2000/ WinXP and MacOS
9.2.1/MacOS10.2/MacOS10.4 without additional driver
Plug-and-Play operation with Microsoft OS or MacOS default drivers
Compliant with USB specification v1.1
Compliant with USB audio device class specification v1.0
Supports USB full speed 12Mbits/s serial data transmission
USB bus power or self power option
Supports suspend/resume and remote wake-up
6MHz crystal input with on-chip PLL and embedded transceiver for USB
On-chip PLL for synchronized with USB host for CODEC interface
USB audio function topology has four input terminals, three output terminals,
one selector unit, one mixer unit and six feature units
USB alternate setting0 is a zero-bandwidth setting; used to release the claimed
bandwidth on the bus when this device is inactive
Isochronous transfer uses adaptive, synchronous synchronization
Supports 2ch CODEC with I
2
S, Left-justified serial interface format
Embedded Digital Volume Control of Line out / in for I
2
S interface mode
Compliant with USB HID class specification v1.1; pin control for volume up /
down, play mute, and record mute
Supports two wire series bus interface; slave only interface with transfer speed
up to 400Kbps(Fast-mode)
EEPROM interface for customized USB IDs and strings; CODEC registers
programming
Sonix Confidential
-1-
Do not copy, reproduce, or distribute without permission
2006 Aug 10, V1.01
Data Sheet
USB Audio Controller
SN11220ACF
3.3 V core operation and 5 V tolerant I/O
Available in 48-pin LQFP (7x7 mm)
System on chip solution: low cost and easy implementation without external
memory
LED indicator pins for playback and recording mute
4 GPIO pins controlled via USB HID
Claim variable max packet size for saving USB bandwidth; according to
sampling rate under
HID interrupt interval can be modified via EEPROM
EEPROM content can be read from HID pipe
Transferring length up to each 16 bytes among PC to device and device to PC
by USB HID
MCU can write particular register address (0x0b) to activate device to upload
update data to PC when MCU has written new data through two wire series bus
interface (section VIII)
Embedded 5V to 3.3V regulator
Features programmable by jumper pins and EEPROM values
Support voiceband CODEC PCM interface in master/slave operation
A-law and
μ-law
translation
Sonix Confidential
-2-
Do not copy, reproduce, or distribute without permission
2006 Aug 10, V1.01
Data Sheet
USB Audio Controller
SN11220ACF
IV.
Pin assignment and description (48-pin LQFP)
Pad Name
DR(EEPROM_ DO)
DW(EEPROM_ DI)
SK(EEPROM_SK)
CS(EEPROM_CS)
PADFUN 0
PADFUN 1
VDD
PADFUN 3
TAVDD
USBDP
USBDM
TAVSS
RSTN
LEDN
PIN No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Type
I, ST
O, 4mA, SR
O, 4mA, SR
O, 4mA, SR
I, ST
I, ST
P
I, ST
P
I/O
I/O
P
I, ST, PU
O, 8mA, SR
Description
EEPROM data output
EEPROM data input
EEPROM clock pin
EEPROM chip select
CODEC function configuration pin 0 (page 11)
CODEC function configuration pin 1 (page 11)
3.3V power pin
CODEC function configuration pin 3 (page 11)
Power pin for USB transceiver
USB data plus (D+)
USB data minus (D-)
Power pin for USB transceiver
System reset pin, low enable. Pull-high this pin.
LED indicator pin, output low after power on reset,
toggle during operation
Volume
down
control,
edge
trigger
with
64ms
15
VOLDN
I, ST
de-bouncing circuit
Volume up control, edge trigger with 64ms de-bouncing
16
VOLUP
I, ST
circuit
Playback mute control pin, edge trigger with 64ms
17
18
19
20
MUTEP
GPIO2
HIDMUTER
GPIO0
I, ST
de-bouncing circuit
I/O
O, 8mA, SR
I/O
General Purpose I/O 2
Playback mute led indicator
General Purpose I/O 0
Sonix Confidential
-4-
Do not copy, reproduce, or distribute without permission
2006 Aug 10, V1.01
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