ADF7023-JBCPZ Analog Devices Inc, ADF7023-JBCPZ Datasheet - Page 75
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ADF7023-JBCPZ
Manufacturer Part Number
ADF7023-JBCPZ
Description
TXRX FSK/GFSK/MSK/GMSK 32LFCSP
Manufacturer
Analog Devices Inc
Series
-r
Datasheet
1.EVAL-ADF7023-JDB1Z.pdf
(100 pages)
Specifications of ADF7023-JBCPZ
Frequency
902MHz ~ 958MHz
Data Rate - Maximum
300kbps
Modulation Or Protocol
FSK, GFSK, GMSK, MSK
Applications
ISM
Power - Output
13.5dBm
Sensitivity
-116dBm
Voltage - Supply
2.2 V ~ 3.6 V
Current - Receiving
12.8mA
Current - Transmitting
32.1mA
Data Interface
PCB, Surface Mount
Memory Size
-
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
32-WFQFN Exposed Pad, CSP
Rf Ic Case Style
LFCSP
No. Of Pins
32
Supply Voltage Range
2.2V To 3.6V
Operating Temperature Range
-40°C To +85°C
Transmitting Current
32.1mA
Data Rate
300Kbps
Modulation Type
2FSK, GFSK, MSK
Rohs Compliant
Yes
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
PA/LNA MATCHING
The ADF7023-J has a differential LNA and both a single-ended
PA and differential PA. This flexibility allows numerous
possibilities in interfacing the ADF7023-J to the antenna.
Combined Single-Ended PA and LNA Match
The combined single-ended PA and LNA match allows the
transmit and receive paths to be combined without the use of
an external transmit/receive switch. The matching network
design is shown in Figure 85. The differential LNA match is a
five-element discrete balun giving a single-ended input. The
single-ended PA output is a three-element match consisting of
the choke inductor to the CREGRF2 regulated supply and an
inductor and capacitor series.
The LNA and PA paths are combined, and a seventh-order
harmonic filter provides attenuation of the transmit harmonics.
In a combined match, the off impedances of the PA and LNA
must be considered. This can lead to a small loss in transmit
power and degradation in receiver sensitivity in comparison
with a separate single-ended PA and LNA match. However, with
optimum matching, the typical loss in transmit power is <1 dB,
and the degradation in sensitivity is <1 dB when compared with
a separate PA and LNA matching topology.
CONNECTION
CONNECTION
ANTENNA
ANTENNA
Figure 85. Combined Single-Ended PA and LNA Match
Figure 86. Combined Differential PA and LNA Match
HARMONIC
HARMONIC
FILTER
FILTER
Rev. 0 | Page 75 of 100
MATCH
Separate Single-Ended PA/LNA Match
The separate single-ended PA and LNA matching configuration
is illustrated in Figure 84. The network is the same as the combined
matching network shown in Figure 85 except that the transmit and
receive paths are separate. An external transmit/receive antenna
switch can be used to combine the transmit and receive paths
to allow connection to an antenna. In designing this matching
network, it is not necessary to consider the off impedances of
the PA and LNA, and, thus, achieving an optimum match is less
complex than with the combined single-ended PA and LNA match.
Combined Differential PA/LNA Match
In this matching topology, the single-ended PA is not used. The
differential PA and LNA match comprises a five-element discrete
balun giving a single-ended input/output, as illustrated in
Figure 86. The harmonic filter is used to minimize the RF
harmonics from the differential PA.
RX
TX
Figure 84. Separate Single-Ended PA and LNA Match
HARMONIC FILTER
3
4
5
6
3
4
5
6
CREGRF2
RFIO_1P
RFIO_1N
RFO2
ADF7023-J
CREGRF2
RFIO_1P
RFIO_1N
RFO2
ADF7023-J
LNA MATCH
PA MATCH
3
4
5
6
CREGRF2
RFIO_1P
RFIO_1N
RFO2
ADF7023-J
ADF7023-J