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參數(shù)資料
| 型號： | SA7025 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low-voltage 1GHz fractional-N synthesizer |
| 中文描述： | 低壓1GHz的分?jǐn)?shù)N頻率合成器 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 304K |
| 代理商： | SA7025 |
Philips Semiconductors
Product specification
SA7025
1GHz low-voltage Fractional-N synthesizer
1996 Aug 6
13
Table 3. PR Modulus
PR
Modulus Prescaler
Bit Capacity
NM2
8
4
NM1
12
12
NM3
–
4
01
10
2
3
When the serial input A word is loaded, the output circuits are in the
“speed-up mode” as long as the STROBE is H, else the “normal
mode” is active. In the “normal mode” the current output PHP is:
I
PHP_N
I
PHP
I
PHP_comp
where:
|I
PHP
|
CN
I
RN
32
:charge pump current
|I
PHP_comp
|
FRD
I
RF
128
:fractional comp.
current
The current in PHI is zero in “normal mode”.
In “speed-up mode” the current in output PHP is:
I
PHP_S
I
PHP
I
PHP_comp
|I
PHP
|
CN
I
RN
32
(2
CL
1
1)
|I
PHP_comp
|
FRD
I
RF
128
(2
CL
1
1)
In “speed-up mode” the current in output PHI is:
I
PHI_S
where:
I
PHI
I
PHI_comp
|I
PHI
|
I
RN
CN
32
(2
CL
1
) CK
|I
PHI_comp
|
I
RF
FRD
128
(2
CL
1
) CK
Figure 9 shows that for proper fractional compensation, the area of
the fractional compensation current pulse must be equal to the area
of the charge pump ripple output. This means that the current
setting on the input RN, RF is approximately:
I
RN
I
RF
(Q
f
VCO
)
F
INR
)
(3
CN
where:
Q
f
VCO
= f
INM
×
N,
F
INR
=
=
fractional-N modulus
input frequency of the prescaler
input frequency of the reference divider
PHI pump is meant for switching only. Current and compensation
are not as accurate as PHP.
REF_IN
RDIVIDER
AUX/MAIN
DIVIDER
L
“1”
R
D
C
Q
R
D
C
Q
R
“1”
X
P
N
N-TYPE
CHARGE PUMP
PH
P-TYPE
CHARGE PUMP
V
DDA
V
SSA
REF_IN
L
R
X
P
N
I
P
H
SR00607
Figure 8. Phase Detector Structure with Timing
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SA7025DK | Low-voltage 1GHz fractional-N synthesizer |
| SA7026 | 1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA7026DH | 1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA702 | Divide by: 64/65/72 triple modulus low power ECL prescaler |
| SA702D | Divide by: 64/65/72 triple modulus low power ECL prescaler |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA7025DK | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low-voltage 1GHz fractional-N synthesizer |
| SA7026 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA7026DH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA702D | 制造商:NXP Semiconductors 功能描述: 制造商: 功能描述: 制造商:undefined 功能描述: |
| SA702N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Divide by: 64/65/72 triple modulus low power ECL prescaler |
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