nRF24Z1
2.4 GHz wireless audio streamer
Product Specification v1.0
Key Features
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Low cost 0.18 µ CMOS process, 36 pin
6×6 mm QFN package
Single chip 2.4 GHz RF transceiver
4 Mbit/sec RF link
Input/output sample rate up to 48kSPS, 24
bit
Programmable latency
Quality of Service engine supporting up to
1.536 Mbit/s LPCM audio
S/PDIF interface for direct connection to
computer soundcard and surround
receivers
I2S interface for glue-less audio support
SPI or 2-wire interface for up to 12 kbit/s
peak bi-directional digital control/AUX data
On-chip optional compression
On-chip voltage regulators
Few external components
Uses global 2.4 GHz band
Applications
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CD quality headsets
Headsets
Speakers
Surround speakers
Microphone
Audio streaming from computer soundcard to
HiFi system
All rights reserved.
Reproduction in whole or in part is prohibited without the prior written permission of the copyright holder.
2010-11-03
nRF24Z1 Product Specification
Liability disclaimer
Nordic Semiconductor ASA reserves the right to make changes without further notice to the product to
improve reliability, function or design. Nordic Semiconductor ASA does not assume any liability arising out
of the application or use of any product or circuits described herein.
Life support applications
These products are not designed for use in life support appliances, devices, or systems where malfunction
of these products can reasonably be expected to result in personal injury. Nordic Semiconductor ASA
customers using or selling these products for use in such applications do so at their own risk and agree to
fully indemnify Nordic Semiconductor ASA for any damages resulting from such improper use or sale.
Contact details
For your nearest dealer, please see
www.nordicsemi.com
Main office:
Otto Nielsens veg 12
7004 Trondheim
Phone: +47 72 89 89 00
Fax: +47 72 89 89 89
www.nordicsemi.com
RoHS statement
Nordic Semiconductor’s products meet the requirements of Directive 2002/95/EC of the European
Parliament and of the Council on the Restriction of Hazardous Substances (RoHS). Complete hazardous
substance reports as well as material composition reports for all active Nordic products can be found on
our web site
www.nordicsemi.com.
Revision History
Date
November 2010
Version
1.0
Description
Product specification
Revision 1.0
Page 2 of 85
nRF24Z1 Product Specification
Contents
1
1.1
1.2
1.3
2
2.1
2.2
3
3.1
3.2
3.3
3.4
3.5
3.6
4
4.1
4.2
4.3
4.4
4.5
5
5.1
5.2
5.3
6
6.1
6.2
6.3
6.4
6.5
7
7.1
7.2
7.3
7.4
7.5
8
9
10
10.1
10.2
10.3
11
11.1
Introduction .................................................................................................5
Quick reference data ............................................................................5
Prerequisites.........................................................................................5
Writing conventions ..............................................................................5
Product overview ........................................................................................6
Pin assignments ...................................................................................6
Pin functions ........................................................................................7
Architectural overview................................................................................9
Fundamental modes of operation .........................................................10
Communication and data transfer principle ..........................................10
Mode- and Interface alternatives ..........................................................13
Audio transmitter (ATX) ........................................................................14
Audio Receiver (ARX)...........................................................................17
Blocks and functionality common to the ATX abd ARX ........................20
Operation overview .....................................................................................22
Power on/RESET sequence .................................................................22
RF link initialization ...............................................................................22
Audio channel .......................................................................................23
Control channel.....................................................................................24
Power down mode ................................................................................25
nRF24Z1 register MAP ................................................................................26
Register access from the ATX side ......................................................26
Register access from the ARX side ......................................................26
Register map in external EEPROM ......................................................29
Digital I/O......................................................................................................30
Digital I/O behavior during RESET .......................................................30
Audio interfaces ....................................................................................30
Serial master interfaces ........................................................................38
Control and GPIO interfaces.................................................................43
Data exchange between an ATX and ARX...........................................51
Quality of Service (QoS) and RF-protocol ................................................53
Link establishment ................................................................................53
RF protocol ...........................................................................................53
Adaptive Frequency Hopping (AFH).....................................................54
Link registers ........................................................................................57
RF output power ...................................................................................59
Interrupts......................................................................................................60
RESET outputs ............................................................................................62
Power down control ....................................................................................63
Activation of power down mode............................................................63
Wake up from power down ...................................................................63
nRF24Z1 power saving example ..........................................................66
Register update over the control channel ................................................67
Register update and device relink ........................................................68
Page 3 of 85
Revision 1.0
nRF24Z1 Product Specification
12
13
14
15
16
16.1
16.2
17
17.1
17.2
17.3
17.4
17.5
18
18.1
18.2
18.3
19
Test mode ....................................................................................................70
Electrical specifications .............................................................................71
Absolute maximum ratings ........................................................................75
Mechanical specifications ..........................................................................76
Ordering information ..................................................................................77
Package marking ..................................................................................77
Abbreviations ........................................................................................77
Application information ..............................................................................78
Antenna I/O...........................................................................................78
Crystal specification..............................................................................78
Bias reference resistor..........................................................................78
Internal digital supply de-coupling ........................................................78
PCB layout and de-coupling guidelines ................................................78
Reference circuits .......................................................................................80
nRF24Z1 schematics............................................................................80
nRF24Z1 layout ....................................................................................82
ARX BoM ..............................................................................................84
Glossary .......................................................................................................85
Revision 1.0
Page 4 of 85
nRF24Z1 Product Specification
1
Introduction
nRF24Z1 provides a true single chip system for CD quality audio streaming of up to16 bit 48 kSPS audio,
supporting up to 24 bit 48 kSPS input. I2S and S/PDIF interfaces are supported for audio input/output (I/
O). Seamless interfacing of low cost A/D and D/A for analog audio input and output. SPI or 2-wire (I2C
compatible) control serial interfaces. Embedded voltage regulators yield maximum noise immunity and
allow operation from a single 2.0V to 3.6V supply.
1.1
Quick reference data
Parameter
Minimum supply voltage
Temperature range
Peak supply current in transmit
@ -5dBm output power
Peak supply current in receive
mode
Supply current in power down mode
Maximum transmit output power
Audio sample rate
Audio resolution
Receiver sensitivity
Value
2.0
-20 to +80
15
32
5
0
8 to 48
16
-80
Unit
V
°C
mA
mA
µA
dBm
kSPS
bit
dBm
Table 1.nRF24Z1 quick reference data
1.2
Prerequisites
In order to fully understand this product specification, a good knowledge of electronic and software
engineering is necessary.
1.3
Writing conventions
This product specification follows a set of typographic rules to make the document consistent and easy to
read. The following writing conventions are used:
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Commands, bit state conditions, and register names are written in
Courier New.
Pin names and pin signal conditions are written in
Courier New bold.
Cross references are
underlined and highlighted in blue.
Revision 1.0
Page 5 of 85
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