AX5031_16 Datasheet, PDF (7/22 Pages) ON Semiconductor – Advanced Multi-channel Single Chip UHF Transmitter

AX5031
AC Characteristics
Table 6. CRYSTAL OSCILLATOR
Symbol
Description
Condition
Min
Typ
Max
Units
f_XTAL
gm_osc
Crystal frequency
Transconductance oscillator
Note 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
A_osc
Oscillator amplitude at pin CLK16P
Note 2
0.5
V
RIN_osc
Input DC impedance
10
kW
1. Tolerances and start−up times depend on the crystal used.
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 be generated.
Table 7. RF FREQUENCY GENERATION SUBSYSTEM (SYNTHESIZER)
Symbol
Description
Condition
f_REF
f_{range_hi}
f_{range_low}
f_RESO
BW₁
Reference frequency
Frequency range
Frequency resolution
Synthesizer loop
bandwidth
Note 1
BANDSEL = 0
BANDSEL = 1
Loop filter configuration: FLT = 01
Charge pump current: PLLCPI = 010
BW₂
Loop filter configuration: FLT = 01
Charge pump current: PLLCPI = 001
BW₃
Loop filter configuration: FLT = 11
Charge pump current: PLLCPI = 010
BW₄
Loop filter configuration: FLT = 10
Charge pump current: PLLCPI = 010
Min
Typ
Max
16, 24
800
940
400
470
1
100
50
200
Units
MHz
MHz
Hz
kHz
500
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