ML2724
2.4GHz Low-IF 1.5Mbps FSK Transceiver
Final Datasheet
GENERAL DESCRIPTION
The ML2724 is a fully integrated 1.5Mbps frequency
shift keyed (FSK) transceiver that operates in the
unlicensed 2.4GHz ISM frequency band. The device
has been optimized for digital cordless telephone
applications and includes all the frequency generation,
receive and transmit functions. Automatically adjusted
filters eliminate mechanical tuning. Closed loop
modulation eliminates frequency drift and permits
practically unlimited TX duration. The transmitter
generates a 3dBm FSK output signal.
The 1.5Mbps data rate permits data spreading, such as
Direct Sequence Spread Spectrum (DSSS) modulation,
which improves range. The dual conversion Low-IF
receiver has all of the sensitivity and selectivity
advantages of a traditional super-heterodyne without
requiring costly, bulky external filters, while providing
the integration advantages of direct conversion.
The phase locked loop (PLL) synthesizer is completely
integrated, including the voltage controlled oscillator
(VCO), tuning circuits, and VCO resonator. This allows
the ML2724 to be used in frequency hopped spread
spectrum (FHSS) applications.
The ML2724 contains internal voltage regulation. It
also contains PLL and transmitter configuration
registers. The device can be placed in a low power
standby mode for current sensitive applications. It is
packaged in a 32TQFP.
FEATURES
Complete 2.4GHz FSK Transceiver
- High data rate (1.5Mbps)
- -90dBm sensitivity (DSSS modulation)
- 3dBm Output Power (differential, typical)
Closed Loop TX Modulation
Low IF Receiver: No external IF filters required.
Fully Integrated frequency synthesizer:
- No external resonator required.
Sigma-Delta Fractional-N two-port modulator
Automatic Filter Alignment
- No manufacturing adjustments required.
No external data slicer components required
Control outputs correctly sequence and control PA
3-wire control interface
Analog RSSI output
APPLICATIONS
2.4GHz FSK Data Transceivers
- Digital Cordless Telephones
- Wireless PC Peripherals
- Wireless Game Controllers
- Wireless Streaming Media
PIN CONFIGURATION
GNDDMD
RVQMIF
RVDMD
DOUT
RSSI
VBG
VDD
DIN
XCEN
RXON
PAON
EN
DATA
CLK
AOUT
VSS
32 31 30
1
2
3
4
5
6
7
8
9
10 11
29 28 27
26 25
24
23
22
21
20
19
18
VCCA
RVLO
TXOB
TXO
GNDRXMX2
GNDRXMX
GNDRF
RXI
BLOCK DIAGRAM
AOUT
RXI
2.4 GHz
Receive Input
Quadrature
Downmixers
F
to
V
DOUT
Receive Data
Out
RSSI
Test Mux
12 13 14
17
15 16
Filter
Alignment
RSSI
Divide
by 2
Quadrature
Divider
Transmit
Mixer
TXO/TXOB
2.4 GHz
Output
Two-port
Modulator
RVVCO
GND
ORDERING INFORMATION
2
FREF
RVPLL
QPO
GNDPLL
VVREG
VTUNE
Mode
Control
TPC
PAON
RXON
XCEN
Parallel
control lines
DIN
Transmit Data In
Control
Registers
DATA
Serial
CLK Control Bus
EN
FREF
Frequency
Reference
PART #
ML2724DH
TEMP RANGE
-10
o
C to +60
o
C
PACKAGE
32 Pin TQFP 7mmx7mm
SPEC
DS2724-F-01
Bandgap
1.6 GHz
VCO
PLL
Divider
P.D.
Ref.
Divider
VTUNE
QPO
PLL Loop
Filter
DS2724-F-01
APRIL 2003
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
