CMT2157A
Rev 0.8 | Page 6/31
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1.3 Transmitter Specifications
Table 4. Transmitter Specifications
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Frequency Range
[1]
F
RF
240
960
MHz
Synthesizer Frequency
Resolution
F
RES
F
RF
≤
480 MHz
198
Hz
F
RF
> 480 MHz
397
Hz
Symbol Rate
SR
FSK/GFSK
0.5
100
ksps
OOK
0.5
40
ksps
(G)FSK Modulation
Deviation Range
F
DEV
1
200
kHz
Bandwidth-Time Product
BT
GFSK modulation
-
0.5
-
-
Maximum Output Power
P
OUT(Max)
+13
dBm
Minimum Output Power
P
OUT(Min)
-10
dBm
Output Power Step Size
P
STEP
1
dB
PA Ramping Time
[2]
t
RAMP
0
1024
us
Current Consumption
[3]
@ 433.92 MHz
I
DD-433.92
OOK, 0 dBm
6
mA
OOK, +10 dBm
8.5
mA
OOK, +13 dBm
10.2
mA
FSK, 0 dBm
10.8
mA
FSK, +10 dBm
23.8
mA
FSK, +13 dBm
32
mA
Current Consumption
[3]
@ 868.35 MHz
I
DD-868.35
OOK, 0 dBm
6.1
mA
OOK, +10 dBm
9.3
mA
OOK, +13 dBm
11.2
mA
FSK, 0 dBm
12.3
mA
FSK, +10 dBm
26.7
mA
FSK, +13 dBm
35.3
mA
Sleep Current
I
SLEEP
20
nA
Frequency Tune Time
t
TUNE
370
us
Phase Noise @ 433.92
MHz
PN
433.92
100 kHz offset from F
RF
-80
dBc/Hz
600 kHz offset from F
RF
-96
dBc/Hz
1.2 MHz offset from F
RF
-108
dBc/Hz
Phase Noise @ 868.35
MHz
PN
868.35
100 kHz offset from F
RF
-74
dBc/Hz
600 kHz offset from F
RF
-90
dBc/Hz
1.2 MHz offset from F
RF
-102
dBc/Hz
Harmonics Output for
433.92 MHz
[4]
H2
433.92
2
nd
harm @ 867.84 MHz, +13 dBm P
OUT
-52
dBm
H3
433.92
3
rd
harm @ 1301.76 MHz, +13 dBm P
OUT
-57
dBm
Harmonics Output for
868.35 MHz
[4]
H2
868.35
2
nd
harm @ 1736.7 MHz, +13 dBm P
OUT
-68
dBm
H3
868.35
3
rd
harm @ 2605.05 MHz, +13 dBm P
OUT
-52
dBm
OOK Extinction Ration
60
dB
Notes:
[1]. The frequency range is continuous over the specified range.
[2]. 0 and 2
n
us, n = 0 to 10, when set to “0”, the PA output power will ramp to its configured value in the shortest possible
time.
[3]. The working currents are tested with: 1527 packet format/Normal button mode/ 4 push buttons/Sync ID = 0/No LED.
[4]. The harmonics output is measured with the application shown as Figure 10.
