Rainbow Electronics U3741BM - Manual (Page 28)

28
U3741BM
4662B–RKE–10/04
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 4
P
Ref_Red
dBm
(peak
level)
Reduced sensitivity
R
Sense
= 56 k
Ω
, f
in
= 433.92 MHz,
(V
S
= 5 V, T
amb
= 25°C)
at B = 300 kHz
at B = 600 kHz
-71
-67 -76
-72 -81
-77 dBm
dBm
Reduced sensitivity
R
Sense
= 100 k
Ω
, f
in
= 433.92 MHz
at B = 300 kHz
at B = 600 kHz
-80
-76 -85
-81 -90
-86 dBm
dBm
Reduced sensitivity
R
Sense
= 56 k
Ω
, f
in
= 315 MHz
at B = 300 kHz
at B = 600 kHz
-72
-68 -77
-73 -82
-78 dBm
dBm
Reduced sensitivity
R
Sense
= 100 k
Ω
, f
in
= 315 MHz
at B = 300 kHz
at B = 600 kHz
-81
-77 -86
-82 -91
-87 dBm
dBm
Reduced sensitivity variation over full
operating range
R
Sense
= 56 k
Ω
R
Sense
= 100 k
Ω
P
Red
= P
Ref_Red
+ DP
Red
∆
P
Red
5
6 0
0 0
0 dB
dB
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 otherwise specified.
(V
S
= 5 V, T
amb
= 25°C)
Parameters Test Conditions Symbol Min. Typ. Max. Unit
f
cu_DF
1
2
π ×
30k
Ω ×
CDEM
Ч
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