PRELIMINARY PRODUCT SPECIFICATION
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 2.0
Page 1 of 76
April 2005
2.4GHz wireless audio streamer
FEATURES
APPLICATIONS
Low cost 0.18u CMOS process, 36 pin 6x6mm
QFN package
Compact Disk, CD quality
headset
Single chip 2.4GHz RF transceiver
MP3 / Mini Disk headset
4Mbit/sec RF link
Speakers
Input sample rate up to 96kHz, 24bits
Surround speakers
Output sample rate up to 48kHz, 16bits
Microphone
Programmable latency
Musical instruments
Quality of Service engine supporting up to
1.536 Mbit/s LPCM audio
Audio streaming from PC
soundcard to HiFi system
S/PDIF interface for direct connection to PC
soundcard and surround receivers
Download MP3 files from PC
to MP3 player
I2S interface for glueless audio support
Compressed video streaming
SPI or 2-wire interface for up to 12 kbit/sec peak bi-
directional digital control/AUX data
On chip optional 2:1 compression
On chip voltage regulators
Few external components
Uses global 2.4GHz band
GENERAL DESCRIPTION
nRF24Z1 gives you a true single chip system for CD quality audio streaming of up to16 bit
48 kHz audio with support of up to 24 bit 96 kHz input. I2S and S/PDIF interfaces are
supported for audio I/O. Seamless interfacing of low cost A/D and D/A for analog audio
input and output. SPI or 2-wire (I2C compatible) serial interfaces for control. The circuit
has embedded voltage regulators, giving maximum noise immunity and operation from a
single 2.0V to 3.6V supply.
QUICK REFERENCE DATA
Parameter
Value
Unit
Minimum supply voltage
2.0
V
Temperature range
-20 to +80
C
Peak supply current in transmit @ -5dBm output power
15
mA
Peak supply current in receive mode
32
mA
Supply current in power down mode
4
A
Maximum transmit output power
0
dBm
Audio sample rate
32, 44.1 or 48
kbps
Audio resolution
16
bit
Receiver sensitivity
-80
dBm
Table 1-1 nRF24Z1 quick reference data.
nRF24Z1
PRELIMINARY PRODUCT SPECIFICATION
nRF24Z1 wireless audio streamer
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 2.0
Page 2 of 76
April 2005
ORDERING INFORMATION
Type number
Description
Version
nRF24Z1
36L QFN 6x6 mm
A
nRF24Z1-EVKIT
Evaluation kit
1.0
Table 1-2 nRF24Z1 ordering information.
PRELIMINARY PRODUCT SPECIFICATION
nRF24Z1 wireless audio streamer
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 2.0
Page 3 of 76
April 2005
TABLE OF CONTENTS
FEATURES ............................................................................................................................1
APPLICATIONS ....................................................................................................................1
GENERAL DESCRIPTION ...................................................................................................1
QUICK REFERENCE DATA ................................................................................................1
ORDERING INFORMATION ...............................................................................................2
TABLE OF CONTENTS........................................................................................................3
1
Pin Assignment ...............................................................................................................6
2
Pin Function....................................................................................................................7
3
Glossary of terms ............................................................................................................8
4
Architectural Overview...................................................................................................9
4.1
Audio transmitter ..................................................................................................11
4.1.1
I2S audio input ..............................................................................................11
4.1.2
S/PDIF audio input .......................................................................................12
4.1.3
Serial control (slave) interfaces.....................................................................12
4.1.4
Master interfaces...........................................................................................12
4.1.5
Direct data input pins ....................................................................................13
4.1.6
Interrupt output .............................................................................................13
4.2
Audio Receiver .....................................................................................................13
4.2.1
I2S audio output ............................................................................................14
4.2.2
S/PDIF audio output .....................................................................................15
4.2.3
Master interfaces...........................................................................................15
4.2.4
Serial control (slave) interfaces.....................................................................15
4.2.5
Parallel port and PWM..................................................................................15
4.3
Blocks common to audio transmitter and receiver................................................16
4.3.1
XTAL Oscillator...........................................................................................16
4.3.2
Radio Transceiver.........................................................................................16
4.3.3
Quality of Service engine..............................................................................16
4.3.4
Audio compression / Decompression ...........................................................17
4.3.5
Power ............................................................................................................17
4.3.6
IREF / RESET...............................................................................................17
5
Operation overview.......................................................................................................18
5.1
Power on / RESET sequence ................................................................................18
5.2
RF Link initialization............................................................................................18
5.2.1
Idle state ........................................................................................................18
5.2.2
Link-locate state ............................................................................................19
5.2.3
Synchronization state ....................................................................................19
5.3
Audio streaming....................................................................................................19
5.4
Audio receiver clock rate recovery.......................................................................20
5.5
Data link................................................................................................................20
5.6
Power down mode.................................................................................................21
6
nRF24Z1 register MAP.................................................................................................22
6.1
Access from audio transmitter side.......................................................................22
6.2
Access from audio receiver side ...........................................................................22
7
Digital I/O .....................................................................................................................25
7.1
Digital I/O behaviour during RESET....................................................................25
PRELIMINARY PRODUCT SPECIFICATION
nRF24Z1 wireless audio streamer
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 2.0
Page 4 of 76
April 2005
7.2
Audio interfaces ....................................................................................................25
7.3
I2S Audio Interface...............................................................................................25
7.4
S/PDIF Audio Interface ........................................................................................26
7.5
Audio interface functionality ................................................................................27
7.5.1
ATX audio interface control .........................................................................27
7.5.2
ARX audio interface control.........................................................................30
7.5.3
I2S Audio interface timing............................................................................32
7.6
Serial master interfaces .........................................................................................33
7.6.1
Timing serial master interfaces....................................................................36
7.7
Control and GPIO interfaces.................................................................................37
7.7.1
ATX control and GPIO pins .........................................................................37
7.7.2
SPI slave interface.........................................................................................38
7.7.3
2-wire slave interface....................................................................................38
7.7.4
General purpose input pins D[2:0]................................................................40
7.7.5
ATX Control interface timing.......................................................................41
7.7.6
ARX control interface options ......................................................................42
7.7.7
ARX GPIO pins ............................................................................................43
7.8
Data Channel Timing............................................................................................45
7.8.1
Forward data channel, data transfer from ATX to ARX...............................45
7.8.2
Return data channel, data transfer from ARX to ATX .................................46
8
Quality of service (Qos) and RF ...................................................................................48
8.1
Link algorithm.......................................................................................................48
8.2
RF protocol ...........................................................................................................48
8.3
Adaptive frequency hopping.................................................................................48
8.3.1
Adapting to the RF environment...................................................................50
8.4
Link registers.........................................................................................................50
8.4.1
RF link latency..............................................................................................52
8.5
RF output power ...................................................................................................53
9
Interrupts .......................................................................................................................54
10
RESET outputs..........................................................................................................55
11
Power down control ..................................................................................................56
11.1 Enter power down.................................................................................................56
11.2 Wake up from power down...................................................................................56
11.2.1
External pin change.......................................................................................57
11.2.2
Timer controlled wake up .............................................................................57
11.3 nRF24Z1 power saving example ..........................................................................58
12
Register update over the data link.............................................................................60
13
Eletrical Specification...............................................................................................61
14
Absolute maximum ratings .......................................................................................63
15
Package outline .........................................................................................................64
16
Application Information............................................................................................65
16.1 Antenna I/O...........................................................................................................65
16.2 Crystal Specification.............................................................................................65
16.3 Bias reference resistor...........................................................................................65
16.4 Internal digital supply de-coupling .......................................................................65
16.5 PCB layout and de-coupling guidelines................................................................66
17
Application example .................................................................................................67
17.1 nRF24Z1 schematics.............................................................................................67
PRELIMINARY PRODUCT SPECIFICATION
nRF24Z1 wireless audio streamer
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 2.0
Page 5 of 76
April 2005
17.2 nRF24Z1 layout ....................................................................................................69
17.3 nRF24Z1 Bill of Material .....................................................................................71
18
References.................................................................................................................73
19
Definitions.................................................................................................................74
20
Your notes.................................................................................................................75
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