Datasheet

315MHz/433MHz ASK Superheterodyne
Receiver with Extended Dynamic Range
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 50Ω 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
.
AC ELECTRICAL CHARACTERISTICS (continued)
( Typical Application Circuit , V
DD
= 3.0V to 3.6V, all RF inputs are referenced to 50Ω, 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 BW
CMP
100 kHz
Output High Voltage V
DD5
V
Output Low Voltage 0V
CRYSTAL OSCILLATOR
V
XTALSEL
= 0V 6.6128
f
RF
= 433MHz
V
XTALSEL
= V
DD
13.2256
MHz
V
XTALSEL
= 0V 4.7547
Crystal Frequency (Note 5) f
XTAL
f
RF
= 315MHz
V
XTALSEL
= V
DD
9.5094
MHz
Crystal Tolerance 50 ppm
Input Capacitance From each pin to ground 6.2 pF
Recommended Crystal Load
Capacitance
C
LOAD
3pF
Maximum Crystal Load
Capacitance
C
LOAD
10 pF
MAX1473
Maxim Integrated
5