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參數(shù)資料
| 型號： | EVAL-ADF4154EBZ1 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 24/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR ADF4154EB1 |
| 標準包裝： | 1 |
| 主要目的： | 計時，頻率合成器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADF4154 |
| 主要屬性： | 單路分數(shù)-N PLL |
| 次要屬性： | 19.2MHz PFD 圖形用戶界面 |
| 已供物品： | 板，線纜，軟件 |
| 相關產品： | ADF4154BCPZ-ND - IC FRACTION-N FREQ SYNTH 20LFCSP ADF4154BRU-REEL7-ND - IC FRACTION-N FREQ SYNTH 16TSSOP ADF4154BCPZ-RL7-ND - IC FRACTION-N FREQ SYNTH 20LFCSP ADF4154BRUZ-RL7TR-ND - IC FRACTION-N FREQ SYNTH 16TSSOP ADF4154BRUZ-RL-ND - IC FRACTION-N FREQ SYNTH 16TSSOP ADF4154BRU-REEL-ND - IC FRACTION-N FREQ SYNTH 16TSSOP ADF4154BCPZ-RL-ND - IC FRACTION-N FREQ SYNTH 20LFCSP ADF4154BRUZ-ND - IC FRAC-N FREQ SYNTH 16-TSSOP ADF4154BRU-ND - IC FRAC-N FREQ SYNTH 16-TSSOP |
Data Sheet
ADF4154
Rev. C | Page 9 of 24
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The reference input stage is shown in Figure 14. While the
device is operating, usually SW1 and SW2 are closed switches
and SW3 is open. When a power-down is initiated, SW3 is
closed and SW1 and SW2 are opened. This ensures that the
REFIN pin is not loaded while the device is powered down.
BUFFER
TO R COUNTER
REFIN
100k
NC
SW2
SW3
NO
NC
SW1
POWER-DOWN
CONTROL
04833-
027
Figure 14. Reference Input Stage
RF INPUT STAGE
The RF input stage is shown in Figure 15. It is followed by a
two-stage limiting amplifier to generate the current mode logic
(CML) clock levels needed for the prescaler.
BIAS
GENERATOR
1.6V
AGND
AVDD
2k
RFINB
RFINA
04833-
015
Figure 15. 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.
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
04833-
016
Figure 16. A and B Counters
INT, FRAC, MOD, AND R RELATIONSHIP
The INT, FRAC, and MOD values, in conjunction with the
R-counter, enable generating output frequencies that are spaced by
fractions of the PFD. See the RF Synthesizer: A Worked Example
section for more information. The RF VCO frequency (RFOUT)
equation is
(
)
(
)
MOD
FRAC
INT
F
RF
PFD
OUT
+
×
=
(1)
where RFOUT is the output frequency of the external voltage-
controlled oscillator (VCO).
(
) R
D
REF
F
IN
PFD
+
×
=
1
(2)
where:
REFIN is the reference input frequency.
D is the REFIN 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 program-
mable FRAC counter (2 to 4095).
FRAC is the preset fractional ratio of binary 12-bit
programmable FRAC counter (0 to MOD-1).
R-COUNTER
The 4-bit R-counter allows the input reference frequency
(REFIN) to be divided down to produce the reference clock to
the PFD. Division ratios from 1 to 15 are allowed.
PHASE FREQUENCY DETECTOR (PFD) AND
CHARGE PUMP
The PFD takes inputs from the R-counter and N-counter and
produces an output proportional to the phase and frequency
difference between them. Figure 17 is a simplified schematic.
The PFD includes a fixed delay element that sets the width of
the antibacklash pulse, which is typically 3 ns. This pulse
ensures that there is no dead zone in the PFD transfer function
and gives a consistent reference spur level.
U3
CLR2
Q2
D2
U2
DOWN
UP
HI
CP
–IN
+IN
CHARGE
PUMP
DELAY
CLR1
Q1
D1
U1
04833-
017
Figure 17. PFD Simplified Schematic
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-ADF4156EBZ1 | 制造商:Analog Devices 功能描述:EVAL BOARD - Bulk |
| EVAL-ADF4157EB1Z | 功能描述:BOARD EVALUATION FOR ADF4157 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標準包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| EVAL-ADF4157EB1Z1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Resolution 6 GHz Fractional-N Frequency Synthesizer |
| EVAL-ADF4158EB1Z | 功能描述:BOARD EVALUATION FOR ADF4158 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標準包裝:1 系列:PSoC® 主要目的:電源管理，熱管理 嵌入式:- 已用 IC / 零件:- 主要屬性:- 次要屬性:- 已供物品:板，CD，電源 |
| EVAL-ADF4193EBZ1 | 功能描述:BOARD EVALUATION EB1 FOR ADF4193 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標準包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
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