ICS1574B
BIT(S)
15
16
BIT REF.
Reserved
DESCRIPTION
Must be set to 0.
AUX_PCLK
Must be set to 0 except when in the AUX-EN test mode.
When in the AUX-EN test mode, this bit controls the
PCLK output.
Reserved
V[0]..V[2]
Must be set to 0.
Sets the gain of VCO
V[ 2]
1
1
1
1
V[ 1]
0
0
1
1
V[ 0]
0
1
0
1
VCO GAI N
( MHz / Vo l t )
17 – 24
25 – 27
30
45
60
80
28
29 – 30
Reserved
P[0]..P[1]
Must be set to 1.
Sets the gain of the phase detector according to this table:
P[1]
0
0
1
1
P[0]
0
1
0
1
GAI N
( µA/ r a di a n)
0. 05
0. 15
0. 5
1. 5
31
32
33 – 38
39
Reserved
P[2]
See text.
M[0]..M[5]
PCLKEN_POL
Must be set to 0.
Phase detector tuning bit. Should normally be set to one.
M counter control bits. Modulus = value + 1.
When = 0, PCLK output enabled when PCLKEN input is
low. When = 1, PCLK output enabled when PCLKEN input
is high.
Doubles modulus of dual-modulus prescaler (from 6 / 7 to
Controls A counter. When set to zero, modulus = 7.
Otherwise, modulus = 7 for "value" underflows of the
prescaler, and modulus = 6 thereafter until M counter
underflows.
40
41 – 44
DBLFREQ
12 /14).
A[0]..A[3]
8
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
