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Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, 50 Ω system impedance, V AVDD = V DVDD = V PAVDD = V HVIN = +2.1V to +3.6V, f RF = 300MHz to 450MHz,
T A = -40°C to +125°C, unless otherwise noted. Typical values are at V PAVDD = V AVDD = V DVDD = V HVIN = +2.7V, T A = +25°C, unless
otherwise noted.) (Note 1)
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.
100% tested at T A = +125°C. Guaranteed by design and characterization overtemperature.
50% duty cycle at 10kHz ASK data (Manchester coded).
Guaranteed by design and characterization. Not production tested.
Time for final signal detection; does not include baseband filter settling.
Efficiency = P OUT /(V DD x I DD ).
Dependent on PCB trace capacitance.
The oscillator register (0x05) is set to the nearest integer result of f XTAL /100kHz (see the Oscillator Frequency Register
(Address 0x05) section).
Note 9: 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 approximately 50 Ω 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 Application Circuit, V PAVDD = V AVDD = V DVDD = V HVIN = +3.0V, f RF = 433.92MHz, T A = +25°C, IF BW = 280kHz, data rate
= 4kbps Manchester encoded, frequency deviation = ±50kHz, BER = 0.2% average RF power, unless otherwise noted.)
RECEIVER
7.0
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(ASK MODE)
6.8
SUPPLY CURRENT vs. RF FREQUENCY
(ASK MODE)
7.0
SUPPLY CURRENT vs. RF FREQUENCY
(FSK MODE)
6.8
6.6
T A = +85 ° C
T A = +125 ° C
6.7
6.6
6.5
T A = +125 ° C
6.9
6.8
T A = +85 ° C
T A = +125 ° C
6.4
6.4
T A = +85 ° C
6.7
6.2
6.0
T A = -40 ° C
T A = +25 ° C
6.3
6.2
T A = +25 ° C
6.6
T A = -40 ° C
T A = +25 ° C
5.8
5.6
6.1
6.0
T A = -40 ° C
6.5
6.4
2.1
2.4
2.7
3.0
3.3
3.6
300
325
350
375
400
425
450
300
325
350
375
400
425
450
SUPPLY VOLTAGE (V)
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
6
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