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315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
3.0V
V DD
ASK DATA OUT
SCLK
DIO
C26
*
V DD
CS
FSK DATA OUT
32
31
30
29
28
27
26
25
C5
R3
1
DSA-
DVDD
24
V DD
C23
2
3
DSA+
OPA+
DGND
23
C4
C3
DFF
22
C14
4
5
DFA
XTAL2
MAX1471
OPF+
21
C21
C22
Y1
V DD
C15
6
XTAL1
EXPOSED PAD
DSF+
20
R8
7
AVDD
DSF-
19
C27
C6
RF INPUT
L1
8
LNAIN
PDMAXF
PDMINF
18
17
*
C7
9
10
11
12
13
14
15
16
L3
C11
C9
C8
V DD
C12
L2
Figure 2. Typical Application Circuit
C10
IN GND
Y2
OUT
*SEE LAST PARAGRAPH OF
PEAK DETECTORS SECTION
Data Filters
The data filters for the ASK and FSK data are imple-
mented as a 2nd-order lowpass Sallen-Key filter. The
pole locations are set by the combination of two on-
chip resistors and two external capacitors. Adjusting
the value of the external capacitors changes the corner
and a rolloff rate of 40dB/decade for the two-pole filter.
The Bessel filter has a linear phase response, which
works well for filtering digital data. To calculate the
value of the capacitors, use the following equations,
along with the coefficients in Table 2:
frequency to optimize for different data rates. The cor-
ner frequency in kHz should be set to approximately
1.5 times the fastest expected Manchester data rate in
kbps from the transmitter. Keeping the corner frequen-
cy near the data rate rejects any noise at higher fre-
quencies, resulting in an increase in receiver sensitivity.
C F1 =
C F2 =
b
a ( 100 k )( π )( f C )
a
4 ( 100 k )( π )( f C )
The configuration shown in Figure 3 can create a
Butterworth or Bessel response. The Butterworth filter
offers a very flat amplitude response in the passband
where f C is the desired 3dB corner frequency.
For example, choose a Butterworth filter response with
a corner frequency of 5kHz:
12
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