Rainbow Electronics MAX7042 - Manual (Page 4)

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 2x I
LNA . Note that the impedance at 315MHz includes the 3.9nH inductive
degeneration from the LNA source to ground. The impedance at 433.92MHz includes a 0nH inductive degeneration con-
nected from the LNA source to ground. The equivalent input circuit is 47
Ω 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, 50 Ω system impedance, AV
DD = DV DD = HV IN = +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 AV DD = DV DD = HV IN = +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 3.0 2.7 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 3.0 2.7 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
300 350 375 325 400 425 450
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.)