UMA1021AM Datasheet, PDF (5/16 Pages) NXP Semiconductors – Low-voltage frequency synthesizer for radio telephones

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Table 1 Bit allocation; note 1
FIRST IN
REGISTER BIT ALLOCATION
DATA FIELD
dt16 dt15 dt14 dt13 dt12 dt11 dt10 dt9 dt8 dt7 dt6 dt5 dt4 dt3 dt2 dt1 dt0 ad3
test bits; note 2
0
X
X X X OOL⁽³⁾ X CR1⁽⁴⁾ CR0 X X sPON⁽⁵⁾ X X X X X X
0
PM16⁽⁶⁾
main divider coefficient
PM0 0
X
XXX
X
X PR10⁽⁷⁾
reference divider coefficient
PR0 0
LAST IN
ADDRESS
ad2 ad1 ad0
0
0
0
0
0
1
1
0
0
1
0
1
Notes
1. X = don’t care.
2. The test register (address 0000) should not be programmed with any other values except all zeros for normal operation.
3. Bit OOL sets the Out-Of-Lock detector (1 = enabled).
4. Bits CR1 and CR0 set the charge pump current ratio (see Table 2).
5. Bit sPON sets the software power-up for the synthesizer (see Table 3).
6. PM16 is the MSB of the main divider coefficient.
7. PR10 is the MSB of the reference divider coefficient.
Table 2 Charge pump current ratio; note 1
BIT CR1
0
0
1
1
BIT CR0
0
1
0
1
CHARGE PUMP
CURRENT
10 × I_set
18 × I_set
13 × I_set
17 × I_set
Note
1. Reference current for charge pump: I_set = _R-V----^ss---^ee--^tt
Table 3 Power-on programming
PIN PON⁽¹⁾
BIT sPON⁽²⁾
L
X
X
0
H
1
Notes
1. Signal level
a) L = LOW.
b) X = don’t care.
c) H = HIGH.
2. X = don’t care.
SYNTHESIZER
STATE
off
off
on