Datasheet
MAX7042
308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
4 _______________________________________________________________________________________
Note 1: 0.2% BER, 4kbps, Manchester coded, 280kHz IF BW, ±50kHz frequency deviation.
Note 2: Input impedance is measured at the LNAIN pin. Note that the impedance at 315MHz includes the 3.9nH inductive degener-
ation from the LNA source to ground. The impedance at 433.92MHz includes a 0nH inductive degeneration connected from
the LNA source to ground. The equivalent input circuit is 47Ω in series with 3.2pF at 315MHz and 47Ω in series with 3.5pF
at 433.92MHz.
Note 3: The voltage conversion gain is measured with the LNA input matching inductor, the degeneration inductor, and the
LNA/mixer resonator in place, and does not include the IF filter insertion loss.
AC ELECTRICAL CHARACTERISTICS (continued)
(
Typical Application Circuit
, 50Ω system impedance, V
AVDD
= V
DVDD
= V
HVIN
= +2.4V to +3.6V, f
RF
= 308, 315, 418, and
433.92MHz; T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
AVDD
= V
DVDD
= V
HVIN
= +3.0V,
f
RF
= 433.92MHz, P
RFIN
≤ -80dBm, T
A
= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Frequency f
IF
10.7 MHz
RSSI Slope 10 16 21 mV/dB
FSK DEMODULATOR
Conversion Gain 1.1 2.1 3.0 mV/kHz
ANALOG BASEBAND
M axi m um P eak- D etector Band w i d th 50 kHz
Maximum Data-Filter Bandwidth BW
DF
50 kHz
Maximum Data-Slicer Bandwidth BW
DS
100 kHz
Manchester coded 33
Maximum Data Rate
NRZ 66
kHz
CRYSTAL OSCILLATOR
Crystal Frequency f
XTAL
(f
RF
- 10.7)
/ 32
MHz
Crystal Load Capacitance 4.5 pF
5.4
5.8
5.6
6.4
6.2
6.0
7.0
6.8
6.6
7.2
2.4 3.02.7 3.3 3.6
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(1x I
LNA
)
MAX7042 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
-40°C
+125°C
+85°C
+25°C
6.0
6.4
6.2
7.0
6.8
6.6
7.6
7.8
7.4
7.2
8.0
2.4 3.02.7 3.3 3.6
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(2x I
LNA
)
MAX7042 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
-40°C
+25°C
+125°C
+85°C
5.6
6.0
5.8
6.4
6.2
6.8
6.6
7.0
300 350 375325 400 425 450
SUPPLY CURRENT vs. RF FREQUENCY
(1x I
LNA
)
MAX7042 toc03
RF FREQUENCY (MHz)
SUPPLY CURRENT (mA)
+125°C
+85°C
+25°C
-40°C
Typical Operating Characteristics
(
Typical Application Circuit
, V
DD
= 3.0V, f
RF
= 433.92MHz, IF BW = 280kHz, data rate = 4kbps Manchester encoded, frequency
deviation = ±50kHz, BER = 0.2%, T
A
= +25°C, unless otherwise noted.)