RFRXD0420T-I/LQ Microchip Technology, RFRXD0420T-I/LQ Datasheet - Page 10

• Manufacturer Part Number: RFRXD0420T-I/LQ
• Description: IC RCVR 315/433MHZ ASK/FSK32LQFP
• Manufacturer: Microchip Technology

Specifications of RFRXD0420T-I/LQ

• Frequency: 300MHz ~ 450MHz
• Sensitivity: -106dBm
• Data Rate - Maximum: 80 kbps
• Modulation Or Protocol: ASK, FM, FSK
• Applications: Home Automation, Remote Sensing, RKE
• Current - Receiving: 9.2mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• For Use With: DV164102 - KIT DEV RFPICKIT KIT 1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -

rfRXD0420/0920
FIGURE 3-3:
DS70090A-page 10
Step 1: Identify receive (f
Step 2: Calculate crystal frequencies for high- and low-side injection:
Step 3: Calculate Local Oscillator (LO) frequencies (f
Step 4: Select high-side injection (f
Step 5: From the chosen injection mode in Step 4, write the selected crystal frequency (f
Step 6: Calculate image frequency (f
Note:
High-side Injection
Low-side Injection
High-side Injection
Low-side Injection
if High-side Injection
if Low-side Injection
f
f
XTAL-HIGH
XTAL-LOW
f
f
f
f
that is between the ranges of:
rf-image
rf-image
lo-HIGH
injection mode.
lo-LOW
f
XTAL
Image frequency should be sufficiently filtered by the preselector for the application.
FREQUENCY PLANNING WORKSHEET
f
= f
=
=
=
f
=
=
=
if
rf
=
=
f
(
XTAL-HIGH
(
XTAL-LOW
f
f
rf
rf
PLL divide ratio
PLL divide ratio
____________________
+ (2 x f
- (2 x f
f
f
rf
rf
rf
____________________
____________________
) and IF frequency (f
+
-
if
x PLL Divide Ratio =
x PLL Divide Ratio =
if
)
)
rfRXD0420
rfRXD0920
Device
lo-HIGH
f
f
if
if
rf-image
=
=
)
)
) or low-side injection (f
___________ + ( 2 x ___________ )
___________ - ( 2 x ___________ )
) for the Injection mode chosen:
=
=
Preliminary
if
).
(
(
_________ + _________
_________ - _________
lo
LO Frequency Range
) using f
_________ x
_________ x
High-side Injection
300 to 430 MHz
800 to 915 MHz
16 if rfRXD0420
32 if rfRXD0920
16 if rfRXD0420
32 if rfRXD0920
XTAL-HIGH
lo-LOW
16 if rfRXD0420
32 if rfRXD0920
16 if rfRXD0420
32 if rfRXD0920
) that corresponds to the LO frequency
(circle one)
and f
f
rf
f
XTAL-LOW
XTAL
Low-side Injection
)
)
 2003 Microchip Technology Inc.
x PLL divide ratio
= ______________
= ______________
= _______________
= _______________
:
f
= _____________
= _____________
lo
XTAL
) and circle
f
if