U3742bm, Electrical characteristics (continued) – Rainbow Electronics U3742BM User Manual
Page 29
29
U3742BM
4735A–RKE–11/03
Sensitivity variation FSK for the full
operating range compared to
T
amb
= 25
°
C, V
S
= 5 V
f
in
= 433.92 MHz/315 MHz
f
IF
= 1 MHz
P
FSK
= P
Ref_FSK
+
D
P
Ref
D
P
Ref
+2.5
-1.5
dB
Sensitivity variation FSK for full
operating range including IF filter
compared to T
amb
= 25
°
C, V
S
= 5 V
f
in
= 433.92 MHz/315 MHz
f
IF
= 0.86 MHz to 1.14 MHz
f
IF
= 0.82 MHz to 1.18 MHz
P
FSK
= P
Ref_FSK
+
D
P
Ref
D
P
Ref
+5.5
+7.5
-1.5
-1.5
dB
dB
FSK frequency deviation
The sensitivity of the receiver is higher
for higher values of
D
f
FSK
BR_Range0
BR_Range1
BR_Range2 and BR_Range3 are not
suitable for FSK operation
D
f
FSK
20
20
30
30
50
50
kHz
kHz
S/N ratio to suppress inband noise
signals
ASK mode
FSK mode
SNR
ASK
SNR
FSK
10
2
12
3
dB
dB
Dynamic range RSSI amplifier
D
R
RSSI
60
dB
Lower cut-off frequency of the data
filter
f
cu_DF
0.11
0.16
0.20
kHz
Recommended CDEM for best
performance
ASK mode
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
CDEM
39
22
12
8.2
nF
nF
nF
nF
Recommended CDEM for best
performance
FSK mode
BR_Range0 (Default)
BR_Range1
BR_Range2 and BR_Range3 are not
suitable for FSK operation
CDEM
27
15
nF
nF
Maximum edge-to-edge time period of
the input data signal for full sensitivity
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
t
ee_sig
1000
560
320
180
µs
µs
µs
µs
Upper cut-off frequency data filter
Upper cut-off frequency programmable
in 4 ranges via a serial mode word
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
f
u
2.5
4.3
7.6
13.6
3.1
5.4
9.5
17.0
3.7
6.5
11.4
20.4
kHz
kHz
kHz
kHz
Minimum edge-to-edge time period of
the input data signal for full sensitivity
BR_Range0 (Default)
BR_Range1
BR_Range2
BR_Range3
t
ee_sig
270
156
89
50
µs
µs
µs
µs
Reduced sensitivity
R
Sense
connected from pin Sens to V
S
,
input matched according to Figure 6
P
Ref_Red
dBm
(peak
level)
Electrical Characteristics (Continued)
All parameters refer to GND, T
amb
= -40°C to +105°C, V
S
= 4.5 V to 5.5 V, f
0
= 433.92 MHz and f
0
= 315 MHz, unless other-
wise specified. (V
S
= 5 V, T
amb
= 25°C)
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
f
cu_DF
1
2
p
´
30 k
W
´
CDEM
´
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