si4021 Silicon Laboratories, si4021 Datasheet - Page 8

• Manufacturer Part Number: si4021
• Description: Si4021 Universal Ism Band Fsk Transmitter
• Manufacturer: Silicon Laboratories

AC Characteristics
All notes for table above are on page 7.
f
f
t
t
I
P
P
P
P
C
Q
L
BR
BR
df
C
t
t
t
t
C
t
ref
o
lock
sp
OUT
POR
sx
PBt
wake-up
r, f
out
maxL
maxH
out
sp
o
xl
in, D
o
fsk
Symbol
FSK
OOK
Parameter
PLL reference frequency
Transmitter frequency
PLL lock time
PLL startup time
Open collector output current (Note
3)
Available output power
(433 MHz band)
Available output power
(868 and 915 MHz band)
Typical output power
Spurious emission
Output capacitance (set by the
automatic antenna tuning circuit)
Quality factor of the output
capacitance
Output phase noise
FSK bit rate
OOK bit rate
FSK frequency deviation
Crystal load capacitance
See Crystal Selection Guidelines
Internal POR timeout
(Note 6)
Crystal oscillator startup time
Wake-up timer accuracy
Programmable wake-up time
Digital input capacitance
Digital output rise/fall time
Conditions/Notes
Crystal operation mode is parallel (Note
2)
433 MHz band, 2.5 kHz resolution
868 MHz band, 5.0 kHz resolution
915 MHz band, 7.5 kHz resolution
Frequency error < 10 kHz after 10 MHz
step, POR default PLL setting (Note 7)
After turning on from idle mode, with
crystal oscillator already stable, POR
default PLL setting (Note 7)
At all bands
With opt. antenna impedance (Note 4)
With opt. antenna impedance (Note 4)
Selectable in 3 dB steps (Note 3)
At max power with loop antenna
(Note 5)
At low bands
At high bands
100 kHz from carrier
1 MHz from carrier (Note 7)
(Note 7)
Programmable in 30 kHz steps
Programmable in 0.5 pF steps, tolerance
+/- 10%
After V
Crystal ESR < 100 Ohms (Note 8)
Crystal oscillator must be enabled to
ensure proper calibration at startup
(Note 8)
15 pF pure capacitive load
dd
has reached 90% of final value
430.24
860.48
900.72
P
Min
0.5
1.5
1.6
8.5
21
16
30
max
8
1
-
+/-10
-105
Typ
2.3
2.2
-85
1.5
10
20
18
8
6
439.75
879.51
929.27
115.2
Max
P
10
250
512
210
150
-50
3.1
2.8
12
22
16
5 ·
10
6
max
5
2
11
IA4221
dBc/Hz
Units
MHz
dBm
dBm
dBm
kbps
kbps
dBc
kHz
mA
ms
ms
ms
pF
pF
pF
µs
µs
ns
%
8