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參數資料
| 型號： | ADF4153 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Fractional-N Frequency Synthesizer |
| 中文描述： | 分數N頻率合成器 |
| 文件頁數： | 10/24頁 |
| 文件大小： | 354K |
| 代理商： | ADF4153 |
ADF4153
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The reference input stage is shown in Figure 16. 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.
Rev. A | Page 10 of 24
0
BUFFER
TO R COUNTER
REF
IN
100k
NC
SW2
SW3
NO
NC
SW1
POWER-DOWN
CONTROL
Figure 16. Reference Input Stage
RF INPUT STAGE
The RF input stage is shown in Figure 17. It is followed by a
2-stage limiting amplifier to generate the current mode logic
(CML) clock levels needed for the prescaler.
BIAS
GENERATOR
1.6V
AGND
AV
DD
2k
2k
RF
IN
B
RF
IN
A
0
Figure 17. RF Input Stage
RF INT DIVIDER
The RF INT CMOS counter allows a division ratio in the PLL
feedback counter. Division ratios from 31 to 511 are allowed.
INT, FRAC, MOD, AND R RELATIONSHIP
The INT, FRAC, and MOD values, in conjunction with the
R counter, make it possible to generate output frequencies that
are spaced by fractions of the phase frequency detector (PFD).
See the RF Synthesizer: A Worked Example section for more
information. The RF VCO frequency (
RF
OUT
) equation is
(
FRAC
INT
F
RF
PFD
OUT
)
(
)
MOD
+
×
=
(1)
where
RF
OUT
is the output frequency of external voltage
controlled oscillator (VCO).
(
D
REF
F
IN
PFD
1
)
R
+
×
=
(2)
where:
REF
IN
is the reference input frequency.
D
is the REF
IN
doubler bit.
R
is the preset divide ratio of binary 4-bit programmable
reference counter (1 to 15).
INT
is the preset divide ratio of binary 9-bit counter (31 to 511).
MOD
is the preset modulus ratio of binary 12-bit
programmable FRAC counter (2 to 4095).
FRAC
is the preset fractional ratio of binary 12-bit
programmable FRAC counter (0 to MOD).
RF R COUNTER
The 4-bit RF R counter allows the input reference frequency
(REF
IN
) to be divided down to produce the reference clock to
the PFD. Division ratios from 1 to 15 are allowed.
THIRD ORDER
FRACTIONAL
INTERPOLATOR
FRAC
VALUE
MOD
REG
INT
REG
RF N DIVIDER
N = INT + FRAC/MOD
FROM RF
INPUT STAGE
TO PFD
N-COUNTER
0
Figure 18. A and B Counters
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相關代理商/技術參數 |
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| ADF4153ABCPZ | 制造商:Analog Devices 功能描述:SINGLE RF F-N PLL 制造商:Analog Devices 功能描述:SINGLE RF F-N PLL - Trays 制造商:Analog Devices 功能描述:IC PLL FREQ SYNTHESIZER 20-LFCSP 制造商:Analog Devices 功能描述:IC FREQ SYNTHESIZER 4GHZ 20 制造商:Analog Devices 功能描述:IC, FREQ SYNTHESIZER, 4GHZ, 20LFCSP 制造商:Analog Devices Inc. 功能描述:Phase Locked Loops - PLL Single RF F-N PLL 制造商:Analog Devices 功能描述:PLL SYNTHESIZER, FREQUENCY, 4GHZ, LFCSP-20; PLL Type:Frequency Synthesis; Frequency:4GHz; Supply Current:20mA; Supply Voltage Min:2.7V; Supply Voltage Max:3.3V; Digital IC Case Style:LFCSP; No. of Pins:20; Package / Case:20-LFCSP 制造商:Analog Devices 功能描述:IC, FREQ SYNTHESIZER, 4GHZ, 20LFCSP; Synthesizer Type:Frequency; Frequency:4GHz; Supply Voltage Min:2.7V; Supply Voltage Max:3.3V; Supply Current:20mA; Digital IC Case Style:LFCSP; No. of Pins:20; Operating Temperature Min:-40C; ;RoHS Compliant: Yes 制造商:Analog Devices 功能描述:PLL SYNTHESIZER, FREQUENCY, 4GHZ, LFCSP-20; PLL Type:Frequency Synthesis; Frequency:4GHz; Supply Current:20mA; Supply Voltage Min:2.7V; Supply Voltage Max:3.3V; Digital IC Case Style:LFCSP; No. of Pins:20; Package / Case:20-LFCSP ;RoHS Compliant: Yes |
| ADF4153ABCPZ-RL7 | 制造商:Analog Devices 功能描述:SINGLE RF F-N PLL 制造商:Analog Devices 功能描述:Fractional-N Frequency Synthesizer 20-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:SINGLE RF F-N PLL - Tape and Reel 制造商:Analog Devices 功能描述:IC PLL FREQ SYNTHESIZER 20LFCSP 制造商:Analog Devices Inc. 功能描述:Phase Locked Loops - PLL Single RF F-N PLL |
| ADF4153ABRUZ | 制造商:Analog Devices 功能描述:SINGLE RF F-N PLL - Rail/Tube 制造商:Analog Devices 功能描述:ngle RF F-N PLL |
| ADF4153ABRUZ-RL7 | 制造商:Analog Devices 功能描述:SINGLE RF F-N PLL - Tape and Reel 制造商:Analog Devices 功能描述:Single RF F-N PLL |
| ADF4153BCP | 制造商:Analog Devices 功能描述:PLL Frequency Synthesizer Single 20-Pin LFCSP EP 制造商:Analog Devices 功能描述:IC SYNTHESIZER PLL |
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