U3742BM Datasheet, PDF (29/32 Pages) ATMEL Corporation – UHF ASK/FSK RECEIVER

U3742BM
Electrical Characteristics (Continued)
All parameters refer to GND, T_amb = -40°C to +105°C, V_S = 4.5 V to 5.5 V, f₀ = 433.92 MHz and f₀ = 315 MHz, unless other-
wise specified. (V_S = 5 V, T_amb = 25°C)
Parameters
Test Conditions
Symbol
Min.
Typ.
Max. Unit
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} + DP_Ref
DP_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} + DP_Ref
DP_Ref
+5.5
+7.5
-1.5
dB
-1.5
dB
FSK frequency deviation
The sensitivity of the receiver is higher
for higher values of Df_FSK
BR_Range0
BR_Range1
Df_FSK
20
20
30
30
50
kHz
50
kHz
BR_Range2 and BR_Range3 are not
suitable for FSK operation
S/N ratio to suppress inband noise
signals
Dynamic range RSSI amplifier
ASK mode
FSK mode
SNR_ASK
10
SNR_FSK
2
12
dB
3
dB
DR_RSSI
60
dB
Lower cut-off frequency of the data
filter
f_{cu_DF}
=
-----------------------------1-----------------------------
2 ´ p ´ 30 kW ´ CDEM
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
39
nF
CDEM
22
nF
12
nF
8.2
nF
FSK mode
Recommended CDEM for best
performance
BR_Range0 (Default)
BR_Range1
BR_Range2 and BR_Range3 are not
CDEM
27
15
nF
nF
suitable for FSK operation
BR_Range0 (Default)
Maximum edge-to-edge time period of BR_Range1
the input data signal for full sensitivity BR_Range2
BR_Range3
t_{ee_sig}
1000
µs
560
µs
320
µs
180
µs
Upper cut-off frequency programmable
in 4 ranges via a serial mode word
Upper cut-off frequency data filter
BR_Range0 (Default)
BR_Range1
f_u
BR_Range2
BR_Range3
2.5
3.1
3.7
kHz
4.3
5.4
6.5
kHz
7.6
9.5
11.4
kHz
13.6
17.0
20.4
kHz
BR_Range0 (Default)
Minimum edge-to-edge time period of BR_Range1
the input data signal for full sensitivity BR_Range2
BR_Range3
t_{ee_sig}
270
µs
156
µs
89
µs
50
µs
Reduced sensitivity
R_Sense connected from pin Sens to V_S,
input matched according to Figure 6
P_{Ref_Red}
dBm
(peak
level)
29
4735A–RKE–11/03