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Low-Cost, 308MHz, 315MHz, and 433.92MHz
FSK Transceiver with Fractional-N PLL
Bypass T/ R , ENABLE, DATA, AGC0-1, and AUTOCAL
with 10pF capacitors to GND. Place all bypass capaci-
tors as close to the respective pins as possible.
Transmit/Receive Antenna Switch
The MAX7031 features an internal SPST RF switch that,
when combined with a few external components, allows
the transmit and receive pins to share a common anten-
na (see the Typical Application Circuit) . In receive
mode, the switch is open and the power amplifier is
In actuality, the oscillator pulls every crystal. The crys-
tal’s natural frequency is really below its specified fre-
quency, but when loaded with the specified load
capacitance, the crystal is pulled and oscillates at its
specified frequency. This pulling is already accounted
for in the specification of the load capacitance.
Additional pulling can be calculated if the electrical
parameters of the crystal are known. The frequency
pulling is given by:
C m ? 1 1 ?
2 ? CASE LOAD CASE SPEC ? ?
? C
+ C C
+ C
shut  down,  presenting  a  high  impedance  to  minimize
the loading of the LNA. In transmit mode, the switch
closes to complete a resonant tank circuit at the PA out-
put and forms an RF short at the input to the LNA. In
f P =
?
x 10 6
this mode, the external passive components couple the
output of the PA to the antenna to protect the LNA input
from strong transmitted signals.
The switch state is controlled by the T/ R pin (pin 22).
Drive T/ R high to put the device in transmit mode; drive
T/ R low to put the device in receive mode.
Crystal Oscillator (XTAL)
The XTAL oscillator in the MAX7031 is designed to pre-
sent a capacitance of approximately 3pF between the
XTAL1 and XTAL2 pins. In most cases, this corre-
sponds to a 4.5pF load capacitance applied to the
where:
f P is the amount the crystal frequency is pulled in ppm.
Cm is the motional capacitance of the crystal.
C CASE is the case capacitance.
C SPEC is the specified load capacitance.
C LOAD is the actual load capacitance.
When the crystal is loaded as specified, i.e., C LOAD =
C SPEC , the frequency pulling equals zero.
external crystal when typical PCB parasitics are added.
It is very important to use a crystal with a load
capacitance that is equal to the capacitance of the
MAX7031 crystal oscillator plus PCB parasitics. If a
crystal designed to oscillate with a different load
capacitance is used, the crystal is pulled away from its
stated operating frequency, introducing an error in the
reference frequency. Crystals designed to operate with
higher differential load capacitance always pull the ref-
erence frequency higher.
PROCESS: CMOS
TOP VIEW
Chip Information
Pin Configuration
24
23
22
21
20
19
18
17
N.C.
DVDD
HVIN
AUTOCAL
25
26
27
28
16
15
14
13
PDMAX
PDMIN
IFIN+
IFIN-
AGC1
AGC0
XTAL1
XTAL2
29
30
31
32
MAX7031
12
11
10
9
MIXOUT
MIXIN-
MIXIN+
LNAOUT
+
1
2
3
4
5
6
7
8
THIN QFN
______________________________________________________________________________________
15
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