Rainbow Electronics ATA5746 - Manual (Page 31)

31
4596A–RKE–05/06
ATA5745/ATA5746 [Preliminary]
3.5
Sensitivity change at
f
RF
= 433.92 MHz
compared to
f
RF
= 315 MHz
f
RF
= 315 MHz to
f
RF
= 433.92 MHz
P = P
REF_ASK
+
∆P
REF1
P = P
REF_FSK
+ ∆P
REF1
(14)
∆P
REF1
+1 dB B
3.6
Sensitivity change versus
temperature, supply
voltage and frequency
offset
FSK f
DEV
= ±38 kHz
∆f
OFFSET
≤ ±160 kHz
ASK 100%
∆f
OFFSET
≤ ±160 kHz
P = P
REF_ASK
+ ∆P
REF1
+
∆P
REF2
P = P
REF_FSK
+
∆P
REF1
+
∆P
REF2
(14) ∆P
REF2
+4.5 –1.5 B
3.7
Reduced sensitivity
R
Sense
connected from
pin SENSE to
pin VS3V_AVCC P
Ref_Red
dBm
(peak
level)
R
Sense
= 62 k
Ω
f
in
= 433.92 MHz
–76 dBm C
R
Sense
= 82 k Ω
f
in
= 433.92 MHz
–88 dBm C
R
Sense
= 62 k Ω
f
in
= 315 MHz
–76 dBm C
R
Sense
= 82 k
Ω
f
in
= 315 MHz
–88 dBm C
Reduced sensitivity
variation over full
operating range R
Sense
= 62 k Ω
R
Sense
= 82 k Ω
P
Red
= P
Ref_Red
+ P
∆Red
∆P
Red
–10 +10 dB
3.8
Maximum frequency
offset in FSK mode
Maximum frequency
difference of f
RF
between
receiver and transmitter in
FSK mode (f
RF
is the
center frequency of the
FSK signal with
f
BIT
= 10 Kbits/s
f
DEV
= ±38 kHz
(14) ∆f
OFFSET
–160 +160 kHz B
3.9
Supported FSK
frequency deviation
With up to 2 dB
loss of sensitivity.
Note that the tolerable
frequency offset is 12 kHz
lower for f
DEV
= ±50 kHz
than for f
DEV
= ±38 kHz,
hence,
∆f
OFFSET
≤ ±148 kHz
(14) f
DEV
±18 ±38 ±50 kHz B
3.10 System noise figure
f
RF
= 315 MHz (14) NF 6.0 9 dB B
f
RF
= 433.92 MHz (14) NF 7.0 10 dB B
13. Electrical Characteristics: General (Continued)
All parameters refer to GND and are valid for T
amb
= –40°C to +105°C, V
VS3V_AVCC
= V
VS5V
= 2.7V to 3.3V, and V
VS5V
= 4.5V to 5.5V.
Typical values are given at V
VS3V_AVCC
= V
VS5V
= 3V, T
amb
= 25°C, and f
RF
= 315 MHz unless otherwise specified. Details about current
consumption, timing, and digital pin properties can be found in the specific sections of the “Electrical Characteristics”.
No. Parameters Test Conditions Pin (1) Symbol Min. Typ. Max. Unit Type*
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Note: 1. Pin numbers in parenthesis were measured with RF_IN matched to 50 Ω according to Figure 2-1 on page 6 with component
values as in Table 2-2 on page 6 (RF
IN
).