ML2712 Datasheet, PDF (1/22 Pages) Micro Linear Corporation – 2.4GHz RF Transceiver

PRELIMINARY
ML2712 2.4GHz RF Transceiver
GENERAL DESCRIPTION
The ML2712 combined with the ML2713 form a FSK
(Frequency Shift Keying) 2.4 GHz radio chipset. The
ML2712 contains the RF and PLL circuits for a half duplex
radio transceiver solution for IEEE802.11 and other
wireless communication protocols using the 2.4 GHz ISM
band.
The ML2712 is controlled using a three-wire programming
interface and three control lines. The transmit circuits
feature an RF down converter for a transmit frequency
translation loop and a Wideband Phase Detector for a
directly modulated VCO transmitter. An RF down
converter mixer is provided for receive. All frequency
generation circuits are integrated for the RF conversion,
the 1LO VCO and PLL plus a 2LO VCO and PLL for use
in dual conversion radios. In addition the ML2712
contains an 8 bit D/A & Comparator that may be used
together as a tracking A/D for Received Signal Strength
Indication measurement (RSSI).
SIMPLIFIED BLOCK DIAGRAM
FEATURES
s 2.4GHz RF Down Converter
s Programmable 2.2GHz and 236MHz Frequency
Synthesizers
s External VCO tank circuits for flexibility
s Compatibility with the OKI MSM7730 and similar
baseband controllers
s Transmit Wideband Phase Comparator for closed loop
transmitter with >5MHz loop bandwidth
s PLLs Programmable via 3 wire interface
s 48 pin TQFP 7mm body
s 3.0V to 5.5V operation
APPLICATIONS
s 2.4GHz Frequency Shift Key modulated radios
s PC Card & Flashcard Wireless Transceivers
s IEEE802.11FHSS Compatible 1 and 2Mbps Standard
ML2731
Bias
Controller
Transmit
Power
Amplifier
R. C.
Loop
Filter
WB
Charge
Pump/WB
Phase
Comp
ML2712
LPF
x2
MUX
RSSI
Input
+
DAC
–
2LO VCO
PLL 2
Lock
Detect
PLL 1
1LO VCO
2LO Loop
Filter &
Tank Circuit
1LO Loop
Filter &
Tank Circuit
Reference
Frequency
Input
3
3
Baseband
Controller
(e.g., MSM7730B)
32MHz
Clock
Tx Regulator
Output
ML2713
DATASHEET ^{January, 2000}