AX5051_16 Datasheet, PDF (8/28 Pages) ON Semiconductor – Advanced Multi-channel Single Chip UHF Transceiver

AX5051
AC Characteristics
Table 6. CRYSTAL OSCILLATOR
Symbol
Description
Condition
Min
Typ
Max
Units
f_XTAL
gm_osc
Crystal frequency
Transconductance oscillator
Notes 1, 3
XTALOSCGM = 0000
XTALOSCGM = 0001
15.5
16
1
2
25
MHz
mS
XTALOSCGM = 0010
3
default
XTALOSCGM = 0011
4
XTALOSCGM = 0100
5
XTALOSCGM = 0101
6
XTALOSCGM = 0110
6.5
XTALOSCGM = 0111
7
XTALOSCGM = 1000
7.5
XTALOSCGM = 1001
8
XTALOSCGM = 1010
8.5
XTALOSCGM = 1011
9
XTALOSCGM = 1100
9.5
XTALOSCGM = 1101
10
XTALOSCGM = 1110
10.5
XTALOSCGM = 1111
11
C_osc
Programmable tuning capacitors at pins
XTALCAP = 000000 default
2
pF
CLK16N and CLK16P
XTALCAP = 111111
33
C_osc−lsb
Programmable tuning capacitors,
increment per LSB of XTALCAP
0.5
pF
f_ext
External clock input
Notes 2, 3
15.5
15
25
MHz
RIN_osc
Input DC impedance
10
kW
1. Tolerances and start−up times depend on the crystal used. Depending on the RF frequency and channel spacing the IC must be calibrated
to the exact crystal frequency using the readings of the register TRKFREQ.
2. If an external clock is used, it should be input via an AC coupling at pin CLK16P with the oscillator powered up and XTALCAP = 000000
3. Lower frequencies than 15.5 MHz or higher frequencies than 25 MHz can be used. However, not all typical RF frequencies can then be
generated.
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