Absolute Maximum Ratings..................................................................................................................................6
Digital Inputs/Outputs...........................................................................................................................................7
Power Consumption..........................................................................................................................................8
Interface Signal Description ...............................................................................................................................11
Serial Interface...................................................................................................................................................12
CAP State Diagram ........................................................................................................................................13
Channel Register Programming Example .......................................................................................................21
Transmit and Receiver Application.....................................................................................................................22
Timing Information .........................................................................................................................................23
Power-On Reset and XO Start-Up ..................................................................................................................24
Manufacturing Information .................................................................................................................................36
Ordering Information ..........................................................................................................................................36
2
Lucent Technologies Inc.
Preliminary Data Sheet
September 2000
W7020
Bluetooth
Radio Module
Description
The W7020
Bluetooth
radio module is a short-range microwave-frequency radio transceiver for
Bluetooth
links. It
operates in the globally available 2.4 GHz to 2.5 GHz ISM free band. The radio is based on a bipolar
complementary metal-oxide semiconductor (BiCMOS) RFIC. The antenna filter and the RX and TX baluns are all
integrated into the radio module.
As illustrated in Figure 2, the radio module requires only a baseband controller, an external antenna connected
through a 50
Ω
characteristic impedance line, and a 13 MHz crystal or reference clock signal. It is controlled by
the digital baseband circuit through the serial interface bus and separate strobe signals. The TX and RX data pins
also connect to the baseband with a maximum bit rate of 1 Mbit/s. The power supply is partitioned into two paths,
one for the VCO circuit and one for all other module supply connections. Each of the supplies should be
externally low-frequency decoupled.
Fast-frequency hopping (FFH) of 1600 hops/s is used with a channel spacing of 1 MHz so that the radio link is
less sensitive to signal fading due to multipath; therefore, antenna diversity is not required. The modulation is
Gaussian frequency shift keying (GFSK) with a BT product of 0.5. The channel bandwidth is 1 MHz and the
modulation index is between 0.28 and 0.35. A binary one is indicated by a positive frequency deviation, and a
binary zero is indicated by a negative frequency deviation.
ANTENNA
BASEBAND INTERFACE
17
CLOCK CONTROL OUTPUTS
34
2
SYS_CLK (13 MHz)
TX_CLK (1 MHz)
LPO_CLK (3.2 kHz)
SERIAL INTERFACE
POWER SUPPLIES
V
CC
SUPPLY
REGULATOR V
CC
-VCO
13 MHz REFERENCE CLOCK
XO_N
100 pF
XO_P
8
7
11
20
31
25
27
26
29
SI_CLK (4 MHz)
SI_CDI (DATA)
SI_CMS (MODE SELECT)
SI_CDO (DATA OUTPUT)
STROBE INPUTS
SYS_CLK_REQ
SYNT_ON
PHD_OFF
TX_ON
RX_ON
PX_ON
DATA INTERFACE
BASEBAND IC
W7020
RADIO SUBSYSTEM
33
24
21
3
5
32
22
4
TX_DATA
RX_DATA
RESET SIGNALS
GND
1, 6, 10, 13, 14,
15, 16, 18, 19,
23, 28
30
POR (DELAYED RESET)
POR_EXT
HOST
CONTROLLER
9
Figure 2. System Connections
Lucent Technologies Inc.
3
W7020
Bluetooth
Radio Module
Preliminary Data Sheet
September 2000
Description
(continued)
As shown in Figure 3, the antenna filter bandpass filters the radio signal to the antenna switch. The switch directs
the signal to the RX balun or from the TX balun. The RX balun performs the transformation from unbalanced to
balanced for the RX signal and connects to the low-noise amplifier (LNA). The LNA is followed by an image
rejection mixer, so no additional image filter is needed before the mixer. The IF signal out of the mixer is filtered
by a bandpass filter and followed by a limiting amplifier and frequency discriminator, giving the RX data output.
This discriminator output is offset-corrected. The receiver IF and detection circuits are all integrated, requiring no
external components. The RSSI level is available digitally through the serial interface.
The transmitter path utilizes direct modulation of the TX data-bit stream onto the VCO. The TX data is shaped by
the Gaussian filter and then is applied to the VCO tank. The VCO is buffered internally and driven to the TX
balanced output through another amplifier stage. The TX balun performs the transformation of the balanced to
unbalanced signal and connects to the antenna switch.
The VCO frequency operating in the 2.4 GHz ISM band is controlled by the phase-locked loop (PLL) synthesizer
through the loop filter. The reference clock oscillator is provided so that only a crystal resonator needs to be
added externally to the module, or the reference clock input can be overdriven with an external signal such as
from a TCXO or VCXO. The frequency accuracy requirement is ±20 ppm.
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