User guide

65
ATA5811/ATA5812 [Preliminary]
4689B–RKE–04/04
2.7
Sensitivity change versus
temperature, supply
voltage and frequency
offset
FSK f
DEV
= ±16 kHz
∆f
OFFSET
≤ ±58 kHz
ASK 100%
∆f
OFFSET
≤ 58 kHz
P = P
REF_ASK
+ ∆P
REF1
+
∆P
REF2
P = P
REF_FSK
+ ∆P
REF1
+
∆P
REF2
(4) ∆P
REF2
+4.5 -1.5 B
2.8
Supported FSK
frequency deviation
With up to 2 dB
loss of sensitivity.
Note that the tolerable
frequency offset is for
f
DEV
= ±22 kHz, 6 kHz
lower than for
f
DEV
= ±16 kHz hence
∆f
OFFSET
≤ ±52 kHz
(4) f
DEV
±14 ±16 ±22 kHz B
2.9 System noise figure
f
RF
= 315 MHz (4) NF 6.0 dB B
f
RF
= 433.92 MHz (4) NF 7.0 dB B
f
RF
= 868.3 MHz (4) NF 9.7 dB B
2.10 Intermediate frequency
f
RF
= 868.3 MHz f
IF
226 kHz A
f
RF
= 433.92 MHz f
IF
223 kHz A
f
RF
= 315 MHz f
IF
227 kHz A
2.11 System bandwidth
This value is for
information only!
Note that for crystal and
system frequency offset
calculations, ∆f
OFFSET
must be used.
(4) SBW 185 kHz A
2.12
System outband
2nd-order input intercept
point with respect to f
IF
∆f
meas1
= 1,800 MHz
∆f
meas2
= 2,026 MHz
f
IF
= ∆f
meas2
- ∆f
meas1
(4) IIP2 +50 dBm C
2.13
System outband
3rd-order input intercept
point
∆f
meas1
= 1.8 MHz
∆f
meas2
= 3.6 MHz
f
RF
= 315 MHz
(4) IIP3 -22 dBm C
f
RF
= 433.92 MHz (4) IIP3 -21 dBm C
f
RF
= 868.3 MHz (4) IIP3 -17 dBm C
Electrical Characteristics: General (Continued)
All parameters refer to GND and are valid for T
amb
= -40°C to +105°C, V
VS1
= V
VS2
= 2.4 V to 3.6 V (1-battery application),
V
VS2
= 4.4 V to 6.6 V (2-battery application) and V
VS2
= V
VAUX
= 4.75 V to 5.25 V (car application). Typical values are given
at V
VS1
= V
VS2
= 3 V and T
amb
= 25°C, f
RF
= 433.92 MHz (1-battery application) unless otherwise specified. Details about cur-
rent 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 brackets mean they were measured with RF_IN matched to 50 Ω according to Figure 7 on page 10 with
component values according to Table 2 on page 10 and RF_OUT matched to 50 Ω according to Figure 16 on page 19 with
component values according to Table 7 on page 19.