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參數(shù)資料
| 型號(hào)： | LMX2323 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | PLLatinum? 2.0 GHz Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLLatinum？ 2.0千兆赫頻率合成射頻個(gè)人通信 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大小： | 185K |
| 代理商： | LMX2323 |
2.0 Programming Description
(Continued)
2.3.1 5-Bit Swallow Counter Divide Ratio (A Counter)
Swallow Count
(A)
0
1
31
NA_CNTR
2
0
0
1
4
0
0
1
3
0
0
1
1
0
0
1
0
0
1
1
Notes:
Swallow Counter Value: 0 to 31
NB_CNTR
≥
NA_CNTR
2.3.2 10-Bit Programmable Counter Divide Ratio (B Counter)
NB_CNTR
6
0
0
1
Divide Ratio
3
4
1023
9
0
0
1
8
0
0
1
7
0
0
1
5
0
0
1
4
0
0
1
3
0
0
1
2
0
1
1
1
1
0
1
0
1
0
1
Notes:
Divide ratio: 3 to 1,023 (Divide ratios less than 3 are prohibited).
NB_CNTR
≥
NA_CNTR
2.3.3 Pulse Swallow Function
The N divider counts such that it divides the VCO RF frequency by (P+1)Atimes, and then divides by P (B -A) times. The B value
(NB_CNTR) must be
≥
3. The continuous divider ratio is from 992 to 32,767. Divider ratios less than 992 are achievable as long
as the binary counter value is greater than the swallow counter value (NB_CNTR
≥
NA_CNTR).
f
VCO
= N x (f
OSC
/R)
N = (P x B) + A
f
VCO
:
Output frequency of external voltage controlled oscillator (VCO)
f
OSC
:
Output frequency of the external reference frequency oscillator
R:
Preset divide ratio of binary 10-bit programmable reference counter (2 to 1023)
N:
Preset divide ratio of main 15-bit programmable integer N counter (992 to 32,767)
B:
Preset divide ratio of binary 10-bit programmable B counter (3 to 1023)
A:
Preset value of binary 5-bit swallow A counter (0
≤
A
≤
31, A
≤
B)
P:
Preset modulus of dual modulus prescaler (P = 32)
2.3.4 CTL_WORD
MSB
LSB
N2
N1
CNT_RST
PWDN
2.3.4.1 Reserve Word Truth Table
CE
1
1
1
1
0
CNT_RST
0
0
1
1
X
PWDN
0
1
0
1
X
Function
Normal Operation
Synchronous Powerdown
Counter Reset
Asynchronous Powerdown
Asynchronous Powerdown
Notes:
X denotes don’t care.
1.
The
Counter Reset
bit when activated allows the reset of both N and R counters. Upon powering up the N counter resumes
counting in “close” alignment with the R counter. (The maximum error is one prescaler cycle).
L
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