W7020 Datasheet, PDF (3/36 Pages) List of Unclassifed Manufacturers – Bluetooth Radio Module

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
POWER SUPPLIES
VCC
SUPPLY
11
REGULATOR VCC-VCO ₂₀
34
SYS_CLK (13 MHz)
2
TX_CLK (1 MHz)
31
LPO_CLK (3.2 kHz)
SERIAL INTERFACE
13 MHz REFERENCE CLOCK
XO_N
100 pF
XO_P
25
8
27
26
7
29
W7020
RADIO SUBSYSTEM
33
24
21
3
5
32
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
BASEBAND IC
DATA INTERFACE
22
TX_DATA
4
RX_DATA
RESET SIGNALS
GND 1, 6, 10, 13, 14,
30
POR (DELAYED RESET)
15, 16, 18, 19,
23, 28
9
POR_EXT
HOST
CONTROLLER
Figure 2. System Connections
Lucent Technologies Inc.
3