MAX1471_05 Datasheet, PDF (7/26 Pages) Maxim Integrated Products – 315MHz/434MHz Low-Power, 3V/5V ASK/FSK Superheterodyne Receiver

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