Owner manual
MAX7044
300MHz to 450MHz High-Efficiency,
Crystal-Based +13dBm ASK Transmitter
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, V
DD
= +2.1V to +3.6V, 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)
Note 1: Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.
Note 2: Production tested at T
A
= +25°C with f
RF
= 300MHz and 450MHz. Guaranteed by design and characterization over tem-
perature and frequency.
Note 3: 50% duty cycle at 10kbps with Manchester coding.
Note 4: Guaranteed by design and characterization, not production tested.
Note 5: PA output is turned on in test mode by V
DATA
= V
CC
/2 + 100mV.
Note 6: PA output is turned off in test mode by V
DATA
= V
CC
/2 – 100mV.
Note 7: Wait time: t
WAIT
= (2
16
x 32) / f
RF
.
Note 8: Generally limited by PC board layout.
Note 9: V
DATA
= V
IL
to V
DATA
= V
IH
after V
DATA
= V
IL
for WAIT time: t
WAIT
= (216 x 32) / f
RF
.
Note 10: V
DATA
= V
IH
. Efficiency = P
OUT
/(V
DD
x I
DD
).
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PHASE-LOCKED LOOP (PLL)
VCO Gain
330
MHz/V
f
OFFSET
= 100kHz -80
f
RF
= 315MHz
f
OFFSET
= 1MHz -90
f
OFFSET
= 100kHz -77
Phase Noise
f
RF
= 433MHz
f
OFFSET
= 1MHz -87
dBc/Hz
f
RF
= 315MHz -50
Maximum Carrier Harmonics
f
RF
= 433MHz -50
dBc
f
RF
= 315MHz -74
Reference Spur
f
RF
= 433MHz -80
dBc
Loop Bandwidth 1.6
MHz
Crystal Frequency f
XTAL
f
RF
/32
MHz
Frequency Pulling by V
DD
3
ppm/V
Maximum Crystal Inductance 50 µH
Crystal Load Capacitance 3pF
DATA INPUT
Data Input High V
IH
V
DD
-
0.25
V
Data Input Low V
IL
0.25
V
Maximum Input Current 10 µA
Pulldown Current 10 µA
CLKOUT OUTPUT
Output Voltage Low V
OL
I
SINK
= 650µA (Note 4)
0.25
V
Output Voltage High V
OH
I
SOURCE
= 350µA (Note 4)
V
DD
-
0.25
V
Load Capacitance C
LOAD
(Note 4) 10 pF
CLKOUT Frequency
f
XTAL
/
16
Hz