MAX1479_09 Datasheet, PDF (3/10 Pages) Maxim Integrated Products – 300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK Transmitter

300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, V_DD = +2.1V to +3.6V, V_ENABLE = V_DD, T_A = -40°C to
+125°C, unless otherwise noted. Typical values are at V_DD = +2.7V, T_A = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SYSTEM PERFORMANCE
Frequency Range
Turn-On Time (Note 5)
f_RF
(Note 2)
Settle to within 50kHz
t_ON
Settle to within 5kHz
300
450 MHz
200
µs
350
Maximum Data Rate (Note 4)
ASK mode (Manchester coded)
FSK mode (Manchester coded)
100
kbps
20
Maximum FSK Frequency
Deviation
Output Power (Note 2)
P_OUT
Transmit Efficiency with CW Tone
(Note 7)
Transmit Efficiency at 50% Duty
Cycle
PHASE-LOCKED-LOOP PERFORMANCE
DEV[2:0] = 111
f_RF = 315MHz
(Note 6)
f_RF = 433MHz
T_A = +25°C, V_DD = +2.7V
T_A = +125°C, V_DD = +2.1V
T_A = -40°C, V_DD = +3.6V
f_RF = 315MHz
f_RF = 433MHz
f_RF = 315MHz
f_RF = 433MHz
55
kHz
80
6.8
10
12.0
2.7
5.3
dBm
12.2 16.1
35
%
34
27
%
25
VCO Gain
Phase Noise
Maximum Carrier Harmonics
Reference Spur
Loop Bandwidth
K_VCO
f_RF = 315MHz
f_RF = 433MHz
f_RF = 315MHz
f_RF = 433MHz
BW
f_OFFSET = 100kHz
f_OFFSET = 1MHz
f_OFFSET = 100kHz
f_OFFSET = 1MHz
280
MHz/V
-75
-98
dBc/Hz
-74
-98
-50
dBc
-45
-40
dBc
300
kHz
Crystal Frequency Range
Crystal Tolerance
f_XTAL
F_RF / 32
50
MHz
ppm
Crystal Load Capacitance
Clock Output Frequency
C_LOAD
(Note 8)
Determined by CLK0 and CLK1; see Table 1
4.5
F_XTAL/N
pF
MHz
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: 50% duty cycle at 10kHz ASK data (Manchester coded).
Note 4: Guaranteed by design and characterization, not production tested.
Note 5: V_ENABLE = V_IL to V_ENABLE = V_IH. f_OFFSET is defined as the frequency deviation from the desired carrier frequency.
Note 6: Dependent on crystal and PCB trace capacitance.
Note 7: V_ENABLE > V_IH, V_DATA > V_IH, Efficiency = P_OUT/(V_DD x I_DD).
Note 8: Dependent on PCB trace capacitance.
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