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参数资料
| 型号： | EVAL-ADF4350EB1Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/32页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD 1 FOR ADF4350 |
| 设计资源： | Broadband Low EVM Direct Conversion Transmitter Using LO Divide-by-2 Modulator (CN0144) |
| 标准包装： | 1 |
| 主要目的： | 计时，频率合成器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADF4350 |
| 主要属性： | 带 VCO 的单路分数-N 和整数-N PLL |
| 次要属性： | USB 接口 |
| 已供物品： | 板，缆线，CD |
| 其它名称： | Q4437453 Q4841122 Q5095480 Q5242312 Q5416250 |
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ADF4350
Rev. A | Page 11 of 32
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 REFIN pin
during power-down.
07
32
5-
0
5
BUFFER
TO R COUNTER
REFIN
100k
NC
SW2
SW3
NO
NC
SW1
POWER-DOWN
CONTROL
Figure 16. Reference Input Stage
RF N DIVIDER
The RF N divider allows a division ratio in the PLL feedback
path. The division ratio is determined by INT, FRAC and MOD
values, which build up this divider.
INT, FRAC, MOD, AND R COUNTER 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 PFD frequency. See the RF
Synthesizer—A Worked Example section for more information.
The RF VCO frequency (RFOUT) equation is
RFOUT = fPFD × (INT + (FRAC/MOD))
(1)
where RFOUT is the output frequency of external voltage
controlled oscillator (VCO).
INT is the preset divide ratio of the binary 16-bit counter
(23 to 65535 for 4/5 prescaler, 75 to 65,535 for 8/9 prescaler).
MOD is the preset fractional modulus (2 to 4095).
FRAC is the numerator of the fractional division (0 to MOD 1).
fPFD = REFIN × [(1 + D)/(R × (1 + T))]
(2)
where:
REFIN is the reference input frequency.
D is the REFIN doubler bit.
T is the REFIN divide-by-2 bit (0 or 1).
R is the preset divide ratio of the binary 10-bit programmable
reference counter (1 to 1023).
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
FRAC
VALUE
MOD
REG
INT
REG
RF N DIVIDER
N = INT + FRAC/MOD
FROM
VCO OUTPUT/
OUTPUT DIVIDERS
TO PFD
N COUNTER
0
732
5-
0
06
Figure 17. RF INT Divider
INT N MODE
If the FRAC = 0 and DB8 in Register 2 (LDF) is set to 1, the
synthesizer operates in integer-N mode. The DB8 in Register 2
(LDF) should be set to 1 to get integer-N digital lock detect.
R COUNTER
The 10–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 1023 are allowed.
PHASE FREQUENCY DETECTOR (PFD) AND
CHARGE PUMP
The phase frequency detector (PFD) takes inputs from the
R counter and N counter and produces an output proportional
to the phase and frequency difference between them. Figure 18
is a simplified schematic of the phase frequency detector. The
PFD includes a fixed delay element that sets the width of the
antibacklash pulse, which is typically 3 ns. This pulse ensures
there is no dead zone in the PFD transfer function, and gives a
consistent reference spur level.
U3
CLR2
Q2
D2
U2
DOWN
UP
HIGH
CP
–IN
N
CHARGE
PUMP
DELAY
CLR1
Q1
D1
U1
07
32
5-
00
7
+I
Figure 18. PFD Simplified Schematic
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| EVAL-ADF4350EB2Z | 功能描述:EVALUATION BOARD 2 FOR ADF4350 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
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