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参数资料
| 型号： | EVAL-ADF4350EB1Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/32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 13 of 32
OUTPUT STAGE
The VCO shows variation of KV as the VTUNE varies within the
band and from band-to-band. It has been shown for wideband
applications covering a wide frequency range (and changing
output dividers) that a value of 33 MHz/V provides the most
shows how KV varies with fundamental VCO frequency along
with an average value for the frequency band. Users may prefer
this figure when using narrowband designs.
The RFOUTA+ and RFOUTA pins of the ADF4350 are connected
to the collectors of an NPN differential pair driven by buffered
outputs of the VCO, as shown in Figure 22. To allow the user to
optimize the power dissipation vs. the output power requirements,
the tail current of the differential pair is programmable by
Bits [D2:D1] in Register 4 (R4). Four current levels may be set.
These levels give output power levels of 4 dBm, 1 dBm, +2
dBm, and +5 dBm, respectively, using a 50 Ω resistor to AVDD
and ac coupling into a 50 Ω load. Alternatively, both outputs
can be combined in a 1 + 1:1 transformer or a 180° microstrip
coupler (see the Output Matching section). If the outputs are
used individually, the optimum output stage consists of a shunt
inductor to VVCO. The unused complementary output must
be terminated with a similar circuit to the used output.
80
70
60
50
40
30
20
10
0
2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6
07
325
-13
3
VC
O
SEN
SI
T
IVI
T
Y
(M
H
z/
V
)
FREQUENCY (GHz)
An auxiliary output stage exists on Pins RFOUTB+ and RFOUTB
providing a second set of differential outputs which can be
used to drive another circuit, or which can be powered down
if unused. The auxiliary output must be used in conjunction
with the main RF output. It cannot be used with the main
output powered down.
Another feature of the ADF4350 is that the supply current to
the RF output stage can be shut down until the part achieves
lock as measured by the digital lock detect circuitry. This is
enabled by the mute till lock detect (MTLD) bit in Register 4 (R4).
Figure 21. KV vs. Frequency
In fixed frequency applications, the ADF4350 VTUNE may
vary with ambient temperature switching from hot to cold.
In extreme cases, the drift causes VTUNE to drop to a very low
level (<0.25 V) and can cause loss of lock. This becomes an
issue only at fundamental VCO frequencies less than 2.95 GHz
and at ambient temperatures below 0°C.
VCO
RFOUTA+
RFOUTA–
BUFFER/
DIVIDE-BY-
1/2/4/8/16
07
32
5-
0
1
0
In cases such as these, if the ambient temperature decreases
below 0°C, the frequency needs to be reprogrammed (R0 updated)
to avoid VTUNE dropping to a level close to 0 V. Reprogramming
the part chooses a more suitable VCO band, and thus avoids
the low VTUNE issue. Any further temperature drops of more
than 20°C (below 0°C) also require further reprogramming.
Any increases in the ambient temperature do not require repro-
gramming.
Figure 22. Output Stage
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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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| EVAL-ADF4360-1EBZ1 | 功能描述:BOARD EVALUATION FOR ADF4360-1 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 主要目的:电源管理，电池充电器 嵌入式:否 已用 IC / 零件:MAX8903A 主要属性:1 芯锂离子电池 次要属性:状态 LED 已供物品:板 |
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