Rainbow Electronics U3741BM - Manual (Page 29)

29
U3741BM
4662B–RKE–10/04
Reduced sensitivity variation for
different values of R
Sense
Values relative to
R
Sense
= 56 k
Ω
R
Sense
= 56 k
Ω
R
Sense
= 68 k
Ω
R
Sense
= 82 k
Ω
R
Sense
= 100 k
Ω
R
Sense
= 120 k
Ω
R
Sense
= 150 k
Ω
P
Red
= P
Ref_Red
+
∆
P
Red
∆
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 ext. pull-up resistor
R
ext
= 5 k
Ω
V
OI
R
Pup
τ
C
L
C
L
39
0.08
50
0.3
61
2.5
41
540
V
k
Ω
µs
pF
pF
POUT output
- Saturation voltage LOW
- Saturation voltage HIGH
I
POUT
= 1 mA
I
POUT
= -1 mA
V
Ol
V
Oh
V
S
- 0.3 V
0.08
V
S
- 0.14V
0.3 V
V
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 otherwise specified.
(V
S
= 5 V, T
amb
= 25°C)
Parameters Test Conditions Symbol Min. Typ. Max. Unit