Rainbow Electronics U3742BM - Manual (Page 30)

30
U3742BM
4735A–RKE–11/03
Reduced sensitivity
(V
S
= 5 V, T
amb
= 25 ° C)
R
Sense
= 56 k W , f
in
= 433.92 MHz,
-67 -72 -77 dBm
R
Sense
= 100 k W , f
in
= 433.92 MHz -76 -81 -86 dBm
R
Sense
= 56 k W , f
in
= 315 MHz -68 -73 -78 dBm
R
Sense
= 100 k W , f
in
= 315 MHz -77 -82 -87 dBm
Reduced sensitivity variation over full
operating range
R
Sense
= 56 k W
R
Sense
= 100 k W
P
Red
= P
Ref_Red
+
D
P
Red
D P
Red
5
6 0
0 0
0 dB
dB
Reduced sensitivity variation for
different values of R
Sense
Values relative to
R
Sense
= 56 k W
R
Sense
= 56 k W
R
Sense
= 68 k W
R
Sense
= 82 k W
R
Sense
= 100 k W
R
Sense
= 120 k W
R
Sense
= 150 k W
P
Red
= P
Ref_Red
+ D P
Red
D P
Red
0
-3.5
-6.0
-9.0
-11.0
-13.5
dB
dB
dB
dB
dB
dB
Threshold voltage for reset V
ThRESET
1.95 2.8 3.75 V
Digital Ports
Data output
- Saturation voltage LOW
- Internal pull-up resistor
- Maximum time constant
- Maximum capacitive load I
ol
= 1 mA
t
= C
L
(R
pup
//R
Ext
)
without external pull-up resistor
R
ext
= 5 k W
V
OI
R
Pup
t
C
L
C
L
39
0.08
50
0.3
61
2.5
41
540
V
k W
µs
pF
pF
FSK/ASK input
- Low-level input voltage
- High-level input voltage
FSK selected
ASK selected V
Il
V
Ih
0.8 ´ V
S
0.2
´
V
S
V
V
ENABLE input
- Low-level input voltage
- High-level input voltage
Idle mode
Active mode V
Il
V
Ih
0.8
´
V
S
0.2 ´ V
S
V
V
MODE input
- Low-level input voltage
- High-level input voltage
Division factor = 10
Division factor = 14 V
Il
V
Ih
0.8 ´ V
S
0.2 ´ V
S
V
V
TEST input
- Low-level input voltage
Test input must always be set to LOW
V
Il
0.2
´
V
S
V
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