MAX7031
Low-Cost, 308MHz, 315MHz, and 433.92MHz
FSK Transceiver with Fractional-N PLL
_______________________________________________________________________________________ 5
AC ELECTRICAL CHARACTERISTICS (continued)
(
Typical Application Circuit
, 50Ω system impedance, V
PAV
DD
= V
AV
DD
= V
DV
DD
= V
HV
IN
= +2.1V to +3.6V, f
RF
= 308MHz, 315MHz. or
433.92MHz, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
PAV
DD
= V
AV
DD
= V
DV
DD
= V
HV
IN
= +2.7V,
T
A
= +25°C, unless otherwise noted.) (Note 1)
Note 1: Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.
Note 2: 100% tested at T
A
= +125°C. Guaranteed by design and characterization over temperature.
Note 3: Guaranteed by design and characterization. Not production tested.
Note 4: Time for final signal detection; does not include baseband filter settling.
Note 5: Efficiency = P
OUT
/(V
DD
x I
DD
).
Note 6: Dependent on PCB trace capacitance.
Note 7: Input impedance is measured at the LNAIN pin. Note that the impedance at 315MHz includes the 12nH inductive degenera-
tion from the LNA source to ground. The impedance at 434MHz includes a 10nH inductive degeneration connected from the
LNA source to ground. The equivalent input circuit is 50Ω in series with ~2.2pF. The voltage conversion is measured with
the LNA input-matching inductor, the degeneration inductor, and the LNA/mixer tank in place, and does not include the IF
filter insertion loss.
Typical Operating Characteristics
(
Typical Operating Circuit
, V
PAVDD
= V
AVDD
= V
DVDD
= V
HVIN
= +3.0V, f
RF
= 433.92MHz, IF BW = 280kHz. 4kbps Manchester
encoded, 0.2% BER deviation = ±50kHz, T
A
= +25°C, unless otherwise noted.)
