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PH2401 Bluetooth Radio Family
Integrated 2.4 GHz ISM Band Low Power Transceiver
V1.0 (Advanced)
Features
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Fully-integrated single-chip
transceiver with on-chip VCO,
synthesizer, PA, LNA, IF
fiters, RSSI, and bit slicer for
ISM 2.4GHz RF transceiver
0.5um SiGe BiCMOS Silicon
Monolithic IC
Class 2 and 3 compliant with
Bluetooth specification v1.0
Low voltage supply 1.8V
Low power consumption
(<20mA typical)
RF sensitivity to -84 dBm
Output power selectable
between 0dBm and -10dBm
Software and hardware
programmable
Crystal independent
fractional-N synthesizer
Programmable Tx power
control
Requires no external shielding
Serial port baseband RF
Interface
BCC48++ pin package
Product Description
The PH2401Family is a set of three integrated Bluetooth radio transceivers that
are optimized for use in 2.4 GHz wireless systems. They have been designed for
ultra-low power Personal Wireless Connectivity applications that require
maximum battery life, small form factor, and low system cost. They are fully
compliant with Bluetooth Specification v1.0.
The PH2401 Family devices are based on a core short-range radio transceiver
for Bluetooth communication links that operate in the ISM frequency band, 2.4
GHz. Fast frequency hopping (1600 hop/s), 79 available channels (2.402 to
2.480 GHz), and a maximum Tx and Rx bit rate of 1Mbit/s exploit the
maximum channel bandwidth allowed in the ISM band.
The transceivers use a Gaussian Frequency Shift Keying (GFSK) modulation
techniques with a BT of 0.5. The channel bandwidth is 1MHz, and the
frequency deviation is between 140 and 175 kHz. They are designed in a SiGe
BiCMOS ASIC process. Each device is packaged in a Bumped Chip Carrier
(BCC++) package with 48 or fewer pins.
Figure 1: PH2401 Block Diagram
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The Bluetooth specification defines classes of radio operation based on transmit
power. The three members of the PH2401 family are designed to meet
Bluetooth Class 2 and 3 operation. They operate over ranges from 1 to 10
meters. The transmitter power amplifier offers programmable output levels
between -10 and +2 dBm.
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PH2401 Bluetooth Radio
Typical Applications
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Personal wireless
communications
Personal data assistants
(PDAs)
Headsets
Handsets
Mobile computing
Cameras
Computer peripherals
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All three members are designed using the following core technology:
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Delta-Sigma synthesizer incorporating two-point angle modulation
stabilized over the operating temperature range (see Figure 1)
Calibration method for two-point angle modulation scheme
Radio receiver architecture based on complex AGC/filtering and PLL
demodulation
Fast dynamic-threshold MFSK bit slicer
In addition, each version includes serial interface logic, power management and
a temperature measurement sensor.
The receiver is comprised of a complex RF-to-IF down converter LNA/Mixer,
an AGC/complex filter, and a dual ADC for the I/Q signal paths. The digital
outputs from the ADCs are passed to a 2FSK demodulator consisting of a
complex PLL, Gaussian filter, and a dynamic MFSK bit slicer for 2FSK data.
The bit stream is passed to a baseband processor for symbol time recovery. An
analog RSSI indicator is obtained by combining the outputs of the AGC control
voltage. The receiver also supports crystal frequency error compensation to
within 10s of Hertz via a digital algorithm in the demodulator. This feature
allows the receiver to track and correct crystal errors using a feedback control
loop.The transmitter consists of a Delta-Sigma controlled Fractional-N
synthesizer with two-point direct digital modulation.
For complete operation, the radio transceiver must be connected to a baseband
controller or to a device that emulates baseband functionality. The baseband
function is required to read and write to the internal registers in the radio
controller; these registers are used for programming the frequency, tuning, and
control. Communication between the baseband and the radio is through the
serial bus.
All members of the family can operate with a number of different crystal
frequencies due to its 16-bit Fractional-N synthesizer. The Fractional-N design
allows the synthesizer to be tuned to within 125kHz of the desired channel; that
is, to within 50ppm. The tuning does not rely on the type of crystal used.
Significant economies, therefore, are gained in systems like cell phone
handsets, as the handset crystal can be used without sacrificing tuning speed or
channel accuracy. The following crystal frequencies are supported: 10, 13, 19.2,
19.68, and 19.8MHz.
The antenna should be connected through an external switch. The power supply
is divided into three parts to supply the VCO, the digital logic, and the
remainder of the radio.
PH2401
The PH2401only includes the
base functionality to meet the
Bluetooth requirements for
general applications.
PH2401A
The PH2401-A has been
enhanced with a 12-bit ADC
microphone and a voltage pump
for use with 1.2V power supplies
to meet the Bluetooth Accessories
market (e.g.: headset application).
PH2401B
The PH2401-B adds an auxiliary
synthesizer to the PH2401 in
order to provide programmable
clock to the Bluetooth baseband
IC, for basebadnd architectures
that require it.
Contact Information
Philsar Semiconductor Inc.
146 Colonade Road S.
Nepean, Ontario, Canada
K2E 7Y1
Tel: (613) 274-0922
Fax: (613) 274-0915
website: www.philsar.com
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