Gigawit Electronics GWNO User Manual

GWK5Nx Datasheet

GWK5Nx 2.4GHz Wireless Audio Transmitter / Receiver

1. General Description

GWK5Nx is the digital audio interface version of Gigawit GWK5 family wireless digital audio products. It
is designed to interface with the DSP or digital amplifiers directly. GWK5Nx supports most of I2S format
and sample rates.
Inheriting from its GWK5 family, GWK5Nx features both good wireless performance and audio
performance. GWK5Nx has good RF co-existence and robust link quality, can combat the most
interference from the crowded 2.4G ISM band. GWK5Nx uses non-compression PCM signal thus
delivering very low THD audio. By adopting advance forward error correction and error concealment
algorithm, GWK5Nx can reach <15ms latency, this makes it ideal for the Video synchronization, Home
Theater applications.
GWK5Nx‘s built-in high-speed 32bit processor also offers some added value functions such as Volume,
Treble/Bass, Balance, 2-way Remote control and etc. It will help customers to reduce the total system
cost.

2. Applications

z 5.1 Speakers
z Headphones
z Surround Speakers
z Microphones
z CD Player, DVD Player
z Stereo Audio Dongles

3. Features

z Small RF foot-print (2MHz bandwidth) and frequency agility scheme enables better 2.4GHz

co-existence

z Antenna diversity, forward error correction and error concealment for robust audio link
z None-compression wireless audio transmission with very low THD
z <15ms low latency, ideal for video synchronization applications
z Low Power Consumption
z 10+m RF indoor range
z 1 audio transmitter supports 4 receivers
z Dedicated 2-way logical data channel for remote control
z I2S digital audio interface supports 32 / 44.1 / 48 KHz sample rate
z Supports 2.1 Channel and 96 /192 KHz sample rate by a low-cost sample rate converter
z Power management functions for battery powered applications
z Auto muting function when suffering interference or at poor receiving conditions
z Built-in Treble/Bass, Volume, Balance Control

z Flexible design, custo m function s supported

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(Codec not Included)

4. GWK5Nx Form Factor

GWK5Nx Datasheet

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5. Electrical Specification

GWK5Nx Datasheet

General

Audio

RF

Description Typical

Operation voltage +3.3V DC
Supply current TX: 60mA RX: 60mA (GWK5NO)

TX: 69mA RX: 63mA (GWK5NQ)
Operation temperature
RF Frequency 2400 ~ 2483MHZ
Modulation GFSK
Data rate 2M bps
TX Power +0dBm (GWK5NO)

RX Sensitivity -90dBm (GWK5NO)

RF Range (indoor) 10m (GWK5NO)

Frequency Response 20~20KHz
S/N >85dB @ 20~20KHz
THD+N < 0.01% @ 20~20KHz
Dynamic range 80dB
Digital Audio Format I2S, Left Justify, Right Justify
Sample Rate Support 32KHz, 44.1KHz, 48KHz
Latency Fixed 15ms or application dependent

Table [1]: Electrical Specification

-10 ~ +60℃

+10dBm (GWK5NQ)

-88dBm (GWK5NQ)

15m (GWK5NQ)

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6. GWK5Nx Pin Assignment

GWK5Nx Datasheet

Pin

#

1 GND P Ground
2 3.3V P +3.3V Power Input
3 MFB I/O Power or pairing key input, press long than 3s to turn on or

4 LED I/O Status LED output
5 MCLK O I2S Master Clock Output, NC when I2S is in slave mode
6
7
8 SCLK I/O I2S Bit Clock Input / Output
9 LRCK I/O I2S Left and Right Clock Input / Output

10 SDA

11 SCL

12 GND P Ground
13 NC NA Not Connected
14 GP5 P General purpose IO

Pin name Type Description

off the module, press long than 10s to enter pairing mode.

I2SMOSI I/O I2S Data Master Output / Slave Input
I2SMISO I/O I2S Data Master Input / Slave Output

I/O I2C Data or Standby Control, firmware configurable. F or

/STANDBY

I/O I2C Clock or MUTE Control, firmware configurable.

/MUTE

Standby mode, A high level will be asserted when no TX
signal >5s. When used as I2C, External 4.7K pull-up
resister required.

When used as I2C, External 4.7K pull-up resister required.

15 GP4 I/O General purpose IO
16 GP3 I/O General purpose IO
17 GP2 I/O General purpose IO

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18 GP8 I/O General purpose IO
19 TXD I/O UART TX
20 RXD I/O UART RX

GWK5Nx Datasheet

21 RST
22 KEY I/O

23 LR2 I
24 NC NA Not Connected

I Reset input, active low

Built-in ADC for KEY
192 KHz sampling rate LRCK input

Table [2]. GWK5Nx Pin Description

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7. Application Schematic

GWK5Nx Datasheet

GWK5Nx

3.3VIN

MCLK

MOSI
MISO

SCLK

LRCK

GND
MFB

LED

SDA
SCL

GND

To MCU I2C Control

+3. 3V

R1
2K

KEY

D1

LRCK

SCLK

SDA

SCL

SDIN

T o DSP I2S Out pu t

LED

Figure [1]: GWK5Nx Interfacing with DSP (I2S Slave Input Mode)

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