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ADF7901BRUZ-RL1 데이터시트(PDF) 10 Page - Analog Devices

부품명 ADF7901BRUZ-RL1
상세설명  High Performance ISM Band OOK/FSK Transmitter IC
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ADF7901BRUZ-RL1 데이터시트(HTML) 10 Page - Analog Devices

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ADF7901
Rev. A | Page 10 of 12
3pF
8pF
22nH
27nH
5.6pF
DVDD
RFOUT
RSET
3.6k
Ω
CREG2
2.2
μF
22nF
CVCO
CPOUT
VCOIN
VCOIN
FSK1
FSK2
FSK3
OOK_SEL
TxDATA
CE
9.8304MHz
33pF
33pF
GND
OSC2
OSC1
ANTENNA
ADF7901
PA_EN
RSET_FSK
RSET_OOK
3.6k
Ω
3.6k
Ω
CREG1
2.2
μF
3pF
1.5pF
22nH
36nH
MATCHING 50
Ω
TO ANTENNA
5TH-ORDER, LOW-PASS FILTER
MATCHING RFOUT TO 50Ω
NOTES
1. DECOUPLING CAPACITORS HAVE
BEEN OMITTED FOR CLARITY.
Figure 8. Applications Diagram for the ADF7901 in a Remote Control System
LAYOUT GUIDELINES
The layout of the board is crucial to ensuring low levels of
spurious and harmonics.
Decoupling
Decoupling capacitors (high frequency 22 pF, low frequency
100 nF) should be placed as close as possible to the supply pins
on the part. Low size 0402 and 0603 components are recom-
mended for the high frequency rejection on the supply.
Regulator Stability
A minimum of 1 μF is needed on both CREG1 and CREG2 to ensure
stability. An additional 22 pF capacitor can be added to reject
higher frequency noise. Because many of the internal blocks
run off the regulator, it is critical to reduce its noise. Low size
0402 and 0603 components are recommended for the high
frequency rejection on the supply.
Grounding
Emphasis should be placed on grounding once the decoupling
capacitors have been added. The PA stage switches currents of
15 mA in maximum power mode. This causes changes in the
ground resulting in large return currents that can radiate to
other parts of the board. The shortest and least obstructed
ground from RFGND back to the ground of the battery should be
ensured. A 4-layer board helps, as well as flooding the top layer.
The ground paths should not have any vias and should be wide
tracks.
Supply
The supply tracks can be routed through vias, because they act
as free inductors and make layout easier on a 2-layer board
(see the Decoupling section). Tracks should be wide.
Digital Lines
Digital lines should contain a large resistor in series. This
impedance blocks signals of many frequencies, including
harmonics and the carrier frequency. Long control lines can
act as antennae. It can be useful to add capacitance to ground.
There is some capacitance to ground provided by the lines and
at the input of the digital pins.


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