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315MHz/434MHz Low-Power, 3V/5V
ASK/FSK Superheterodyne Receiver
Typical Operating Characteristics (continued)
(Typical Application Circuit, V AVDD = V DVDD = V HVIN = +3.0V, f RF = 434MHz, T A = +25°C, unless otherwise noted.)
INPUT IMPEDANCE vs. INDUCTIVE
INPUT IMPEDANCE vs. INDUCTIVE
90
80
DEGENERATION
f RF = 315MHz
L1 = 0nH
MAX1471 toc17
-125
-150
90
80
f RF = 434MHz
L1 = 0nH
DEGENERATION
MAX1471 toc18
-125
-150
70
60
-175
-200
70
60
-175
-200
50
40
30
20
10
0
IMAGINARY IMPEDANCE
REAL IMPEDANCE
-225
-250
-275
-300
-325
-350
50
40
30
20
10
0
IMAGINARY
IMPEDANCE
REAL IMPEDANCE
-225
-250
-275
-300
-325
-350
1
10
100
1
10
100
INDUCTIVE DEGENERATION (nH)
PHASE NOISE vs. OFFSET FREQUENCY
INDUCTIVE DEGENERATION (nH)
PHASE NOISE vs. OFFSET FREQUENCY
-50
-60
-70
-80
-90
-100
-110
-120
f RF = 315MHz
-50
-60
-70
-80
-90
-100
-110
-120
f RF = 434MHz
100
1k
10k
100k
1M
10M
100
1k
10k
100k
1M
10M
OFFSET FREQUENCY (Hz)
OFFSET FREQUENCY (Hz)
Pin Description
PIN
1
2
3
4
5
NAME
DSA-
DSA+
OPA+
DFA
XTAL2
FUNCTION
Inverting Data Slicer Input for ASK Data
Noninverting Data Slicer Input for ASK Data
Noninverting Op-Amp Input for the ASK Sallen-Key Data Filter
Data-Filter Feedback Node. Input for the feedback of the ASK Sallen-Key data filter.
2nd Crystal Input
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7
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