參數(shù)資料
型號: ADF4212LBCP
廠商: ANALOG DEVICES INC
元件分類: XO, clock
英文描述: Dual Low Power PLL Frequency Synthesizer
中文描述: PLL FREQUENCY SYNTHESIZER, 2400 MHz, QCC20
封裝: 4 X 4 MM, MO-220VGGD-1, LFCSP-20
文件頁數(shù): 9/20頁
文件大小: 245K
代理商: ADF4212LBCP
REV. 0
ADF4212L
–9–
F
0
–20
–40
–60
–40
–20
0
20
40
TEMPERATURE – C
100
–80
–100
–120
60
80
TPC 19. RF Spurs vs. Temperature
F
0
–20
–40
–60
–40
–20
0
20
40
TEMPERATURE – C
100
–80
–100
–120
60
80
TPC 20. IF Spurs vs. Temperature
FREQ/
MHz
0.561872
0.529742
0.514244
0.405754
0.379354
0.312959
0.322646
0.288881
0.199294
0.206914
0.168344
0.092764
0.036125
0.037007
–0.053842
50
150
250
350
450
550
650
750
850
950
1050
1150
1250
1350
1450
s11.REAL
s11.IMAG
s11.REAL
s11.IMAG
–0.021077
–0.110459
–0.085802
–0.18583
–0.245482
–0.282399
–0.305457
–0.358884
–0.541032
–0.585687
–0.482539
–0.530108
–0.590526
–0.592498
0.97692
0.942115
0.961217
0.920667
0.897441
0.888164
0.850012
0.760189
0.767363
0.779511
0.761034
0.624825
0.635364
0.630242
0.634506 –0.655932
1550
1650
1750
1850
1950
2050
2150
2250
2350
2450
2550
2650
2750
2850
2950
–0.648879
–0.668172
–0.702192
–0.714541
–0.703593
–0.802878
–0.80397
–0.807055
–0.758619
–0.725029
–0.770837
–0.778619
–0.706197
–0.716939
–0.736527
FREQ/
MHz
TPC 21. S Parameter Data for the RF Input
CIRCUIT DESCRIPTION
Reference Input Section
The Reference Input Stage is shown in Figure 2. SW1 and SW2
are normally-closed switches. SW3 is normally open. When
power-down is initiated, SW3 is closed and SW1 and SW2 are
opened. This ensures that there is no loading of the REF
IN
pin
on power-down.
POWER-DOWN
CONTROL
REF
IN
NC
NC
NO
SW3
SW2
SW1
100k
BUFFER
TO R COUNTER
NC = NO CONNECT
Figure 2. Reference Input Stage
RF/IF Input Stage
The RF/IF Input Stage is shown in Figure 3. It is followed by a
two-stage limiting amplifier to generate the CML (Current Mode
Logic) clock levels needed for the prescaler.
2k
2k
1.6V
BIAS
GENERATOR
RF
IN
A
RF
IN
B
AV
DD
AGND
Figure 3. RF/IF Input Stage
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