參數資料
型號: DSP1629
英文描述: TVS 400W 64V UNIDIRECT SMA
中文描述: DSP1629數字信號處理器
文件頁數: 72/126頁
文件大小: 1993K
代理商: DSP1629
Data Sheet
March 2000
DSP1629 Digital Signal Processor
72
Lucent Technologies Inc.
9 Electrical Characteristics and Requirements
(continued)
Table 63. PLL Electrical Specifications, VCO Frequency Ranges
Parameter
Symbol
f
VCO
f
VCO
Min
50
50
Max
160
200
200
Unit
MHz
MHz
ps-rms
VCO frequency range (V
DD
= 3 V
±
10%)
*
VCO frequency range (V
DD
= 3.0 V –
3.6 V)
Input Jitter at CKI
*
The M and N counter values in the
pllc
register must be set so that the VCO will operate in the appropriate range (see Table 63). Choose the
lowest value of N and then the appropriate value of M for
f
INTERNAL CLOCK
=
f
CKI
x (M/(2N)) =
f
VCO
/2.
Table 64. PLL Electrical Specifications and pllc Register Settings
M
V
DD
pllc13 (ICP)
pllc12
Reserved
0
0
0
0
0
0
0
pllc[11:8]
(LF[3:0])
1011
1010
1001
1000
0111
0110
0100
Typical Lock-in Time (
μ
s)
*
*
Lock-in time represents the time following assertion of the PLLEN bit of the
pllc
register during which the PLL output clock is unstable. The
DSP must operate from the 1X CKI input clock or from the slow ring oscillator while the PLL is locking. Completion of the lock-in interval is
indicated by assertion of the LOCK flag.
23—24
21—22
19—20
16—18
12—15
8—11
2—7
2.7 V – 3.6 V
2.7 V – 3.6 V
2.7 V – 3.6 V
2.7 V – 3.6 V
2.7 V – 3.6 V
2.7 V – 3.6 V
2.7 V – 3.6 V
1
1
1
1
1
1
1
30
30
30
30
30
30
30
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