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參數(shù)資料
| 型號： | ICS1572 |
| 英文描述： | GT 7C 7#16S SKT RECP WALL RM |
| 中文描述： | 用戶可編程的差分輸出圖形時鐘發(fā)生器 |
| 文件頁數(shù)： | 8/19頁 |
| 文件大?。?/td> | 276K |
| 代理商： | ICS1572 |
REG#
BIT(S)
BIT REF.
DESCRIPTION
9
0-1
P[0]..P[1]
Sets the gain of the phase detector according to this table.
9
3
[P2]
Phase detector tuning bit. Normally should be set to one.
11
0-1
S[0]..S[1]
PLL post-scaler/test mode select bits
11
2
AUX_CLK
When in the AUXEN clock mode, this bit controls the differential
outputs.
11
3
AUX_N1
When in the AUXEN clock mode, this bit controls the LOAD output
(and consequently the N2 output according to its programming).
12
0
RESERVED
Must be set to zero.
12
1
JAMPLL
Tristates phase detector outputs; resets phase detector logic, and
resets R, A, M, and N2 counters.
12
2
DACRST
Set to zero for normal operation. When set to one, the CLK+ output is
kept high and the CLK- output is kept low. (All other device functions are
unaffected.) When returned to zero, the CLK+ and CLK- outputs will
resume toggling on a rising edge of the LD output (+/- 1 CLK period).
To initiate a RAMDAC reset sequence, simply write a one to
this register bit followed by a zero.
12
3
SELXTAL
When set to logic 1, passes the reference frequency to the post-scaler.
15
0
ALTLOOP
Controls substitution of N1 and N2 dividers into feedback loop of PLL.
When this bit is a logic 1, the N1 and N2 dividers are used.
15
3
PDRSTEN
Phase-detector reset enable control bit. When this bit is set, the AD3
pin becomes a transparent reset input to the phase detector.
See LINE-LOCKED CLOCK GENERATION section for more
details on the operation of this function.
P[1]
0
0
1
1
P[0]
0
1
0
1
GAIN (uA/radian)
0.05
0.15
0.5
1.5
S[1] S[0]
0
DESCRIPTION
0
Post-scaler=1. F(CLK)=F(PLL). The output of the N1 divider drives
the LOAD output which, in turn, drives the N2 divider.
Post-scaler=2. F(CLK)=F(PLL)/2. The output of the N1 divider
drives the LOAD output which, in turn, drives the N2 divider.
Post-scaler=4. F(CLK)=F(PLL)/4. The output of the N1 divider
drives the LOAD output which, in turn, drives the N2 divider.
AUXEN CLOCK MODE. The AUXCLK bit drives the differential
outputs CLK+ and CLK- and the AUXN1 bit drives the LOAD
output which, in turn, drives the N2 divider.
0
1
1
0
1
1
ICS1572
8
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