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MAX1473
315MHz/433MHz ASK Superheterodyne
Receiver with Extended Dynamic Range
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, V DD = 3.0V to 3.6V, all RF inputs are referenced to 50 ? , f RF = 315MHz, T A = -40°C to +85°C, unless
otherwise noted. Typical values are at V DD = 3.3V and T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DATA FILTER
Maximum Bandwidth
BW DF
100
kHz
DATA SLICER
Comparator Bandwidth
Output High Voltage
Output Low Voltage
BW CMP
100
V DD5
0
kHz
V
V
CRYSTAL OSCILLATOR
Crystal Frequency (Note 5)
f XTAL
f RF = 433MHz
f RF = 315MHz
V XTALSEL = 0V
V XTALSEL = V DD
V XTALSEL = 0V
V XTALSEL = V DD
6.6128
13.2256
4.7547
9.5094
MHz
MHz
Crystal Tolerance
50
ppm
Input Capacitance
Recommended Crystal Load
Capacitance
Maximum Crystal Load
Capacitance
C LOAD
C LOAD
From each pin to ground
6.2
3
10
pF
pF
pF
Note 1: 100% tested at T A = +25 ° C. Guaranteed by design and characterization over temperature.
Note 2: IRSEL is internally set to 375MHz IR mode. It can be left open when the 375MHz image rejection setting is desired. A 1nF
capacitor is recommended in noisy environments.
Note 3: BER = 2 x 10 -3 , Manchester encoded, data rate = 4kbps, IF bandwidth = 280kHz.
Note 4: Input impedance is measured at the LNAIN pin. Note that the impedance includes the 15nH inductive degeneration con-
nected from the LNA source to ground. The equivalent input circuit is 50 ? in series with 2.2pF.
Note 5: Crystal oscillator frequency for other RF carrier frequency within the 300MHz to 450MHz range is (f RF - 10.7MHz)/64 for
XTALSEL = 0V, and (f RF - 10.7MHz)/32 for XTALSEL = V DD .
Maxim Integrated
5
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