User guide

70
ATA5811/ATA5812 [Preliminary]
4689B–RKE–04/04
3.9
Impedance RF_OUT in
RX mode
f
RF
= 315 MHz 10 Z
RF_OUT_RX
(36 − j502) Ω C
f
RF
= 433.92 MHz 10 Z
RF_OUT_RX
(19 − j366) Ω C
f
RF
= 868.3 MHz 10 Z
RF_OUT_RX
(2.8 − j141) Ω C
3.10
Noise floor power
amplifier
at ±10 MHz/at 5 dBm
f
RF
= 868.3 MHz
(10) L
TX10M
-125 dBC/Hz C
at f
RF
= 433.92 MHz (10) L
TX10M
-126 dBC/Hz C
f
RF
= 315 MHz (10) L
TX10M
-127 dBC/Hz C
3.11 ASK modulation rate
This correspond to
10 kBaud Manchester
coding and 20 kBaud
NRZ coding
f
Data_ASK
10 kHz C
4XTO
4.1
Pulling XTO due to XTO,
C
L1
and C
L2
tolerances
Pulling at nominal
temperature and supply
voltage
f
XTAL
= resonant
frequency of the XTAL
C
0
≥ 1.5 pF
R
m
≤ 120 Ω
24, 25 ∆f
XTO1
A
C
m
≤ 7.0 fF
C
m
≤ 14 fF
-50
-100
f
XTAL
+50
+100
ppm
4.2
Transconductance XTO at
start
At start-up, after start-
up the amplitude is
regulated to V
PPXTAL
24, 25 g
m, XTO
19 ms B
4.3 XTO start-up time
C
0
≤ 2.2 pF
C
m
= 4.0 fF to 7.0 fF
R
m
≤120 Ω
24, 25 T
PWR_ON_IRQ_1
300 800 µs A
4.4 Maximum C
0
of XTAL
Required for stable
operation with internal
load capacitors
24, 25 C
0max
3.8 pF D
4.5 Internal capacitors C
L1
and C
L2
24, 25 C
L1
, C
L2
14.8 18 pF 21.2 pF B
4.6
Pulling of radio frequency
f
RF
due to XTO, C
L1
and
C
L2
versus temperature
and supply changes
1.5 pF ≤ C
0
≤ 2.2 pF
C
m
= 4.0 fF to 7.0 fF
R
m
≤120 Ω
PLL adjusted with
FREQ at nominal
temperature and supply
voltage
4, 10 ∆f
XTO2
-2 +2 ppm 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.