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Low-Cost, 308MHz, 315MHz, and 433.92MHz
FSK Transceiver with Fractional-N PLL
AC ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, 50 ? system impedance, V PAVDD = V AVDD = V DVDD = V HVIN = +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 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:
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 over temperature.
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.
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 50 ? 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.)
RECEIVER
SUPPLY CURRENT vs. RF FREQUENCY
7.4
SUPPLY CURRENT vs. SUPPLY VOLTAGE
7.0
FSK MODE
18
DEEP-SLEEP CURRENT vs. TEMPERATURE
7.2
+ 125 ° C
6.9
+ 125 ° C
16
7.0
6.8
+85 ° C
6.8
+85 ° C
14
12
10
V CC = +3.6V
V CC = +3.0V
6.6
6.4
6.2
+25 ° C
-40 ° C
6.7
6.6
6.5
-40 ° C
+25 ° C
8
6
4
2
V CC = +2.1V
6.0
6.4
0
2.1
2.4
2.7
3.0
3.3
3.6
300
325
350
375
400
425
450
-40
-15
-10
35
60
85
110
SUPPLY VOLTAGE (V)
RF FREQUENCY (MHz)
TEMPERATURE ( ° C)
_______________________________________________________________________________________
5
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