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CMT2157A
Rev 0.8 | Page 9/31
www.cmostek.com
3. Typical Performance Characteristics
13.4dBm
@ 433.92 MHz
-56.8 dBm
@ 435.12 MHz
-60
-50
-40
-30
-20
-10
0
10
20
432.42 432.72 433.02 433.32 433.62 433.92 434.22 434.52 434.82 435.12 435.42
P
o
w
e
r
(d
B
m)
Frequency (MHz)
Phase Noise @ 433.92 MHz
13.0 dBm
@ 868.35 MHz
-55.9 dBm
@ 869.55 MHz
-65
-55
-45
-35
-25
-15
-5
5
15
866.85 867.1 867.35 867.6 867.85 868.1 868.35 868.6 868.85 869.1 869.35 869.6 869.85
P
o
w
e
r (
d
B
m)
Frequency (MHz)
Phase Noise @ 868.35 MHz
-60
-50
-40
-30
-20
-10
0
10
20
432.92 433.12 433.32 433.52 433.72 433.92 434.12 434.32 434.52 434.72 434.92
P
ow
er
(
dB
m
)
Frequency (MHz)
OOK Spectrum
-50
-40
-30
-20
-10
0
10
20
433.62
433.72
433.82
433.92
434.02
434.12
434.22
P
o
w
e
r (
d
B
m
)
Frequency (MHz)
FSK vs. GFSK
FSK
GFSK
-50
-40
-30
-20
-10
0
10
433.17
433.37
433.57
433.77
433.97
434.17
434.37
434.57
P
o
w
e
r (
d
B
m
)
Frequency (MHz)
Spectrum of Various PA Ramping Options
1024 us
512 us
256 us
128 us
64 us
32 us
SR = 1.2 ksps
-2
0
2
4
6
8
10
12
14
16
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
P
o
w
e
r (
d
B
m)
Supply Voltage (V)
P
OUT
vs. V
DD
13 dBm
10 dBm
0 dBm
Figure 3. Phase Noise, F
RF
= 868.35 MHz,
P
OUT
= +13 dBm, RBW = 10 kHz, Un-encoded
Figure 5. OOK Spectrum,
P
OUT
= +10 dBm, t
RAMP
= 32 us
Figure 6. FSK/GFSK Spectrum,
SR = 9.6 ksps, F
DEV
= 15 kHz
Figure 7. Spectrum of PA Ramping,
SR = 1.2 ksps, P
OUT
= +10 dBm
Figure 4. Phase Noise, F
RF
= 433.92 MHz,
P
OUT
= +13 dBm, RBW = 10 kHz, Un-encoded
Figure 8. Output Power vs. Supply
Voltages, F
RF
= 433.92 MHz