MRF89XAM9A-I/RM Microchip Technology, MRF89XAM9A-I/RM Datasheet - Page 101

• Manufacturer Part Number: MRF89XAM9A-I/RM
• Description: WiFi / 802.11 Modules & Development Tools 915MHz Sub-GHz Transceiver Mod
• Manufacturer: Microchip Technology

Specifications of MRF89XAM9A-I/RM

• Modulation Type: FSK, OOK
• Data Rate Max: 200Kbps
• Sensitivity: -113dBm
• Supply Voltage Range: 2.1V To 3.6V
• Module Interface: SPI, 4-Wire
• Supply Current: 25mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.4.2
The recommended PA bias and matching circuit is
illustrated in Figure 4-5.
FIGURE 4-5:
Refer to Section 4.7 “Bill of Materials” for the opti-
mized matching arrangement for each frequency band.
4.4.3
The Receiver and Transmitter share the same RFIO
pin (pin 31). Figure 4-6 illustrates the configuration of
the common RF front-end.
In Transmit mode, the PA and PA regulator are active,
with the voltage on the PARS pin equal to the nominal
voltage of the regulator (1.8V). The external inductance
is used to bias the PA.
In Receive mode, both the PA and PA regulator are
OFF and PARS is tied to ground. The RF choke induc-
tor is then used to bias the LNA.
© 2010 Microchip Technology Inc.
SUGGESTED PA BIASING AND
MATCHING
COMMON INPUT AND OUTPUT
FRONT-END
RECOMMENDED PA BIASING AND OUTPUT MATCHING
PA
PARS
RFIO
100 nH
Low-pass and DC block
Preliminary
0.047 µF
1Ω 1%
FIGURE 4-6:
To
Antenna
SAW
PARS
RFIO
DC block
FRONT-END
DESCRIPTION
Antenna
RX ON
Regulator
MRF89XA
port
(1.8V)
PA
DS70622B-page 101
LNA
PA