参数资料
| 型号： | AD8368ACPZ-WP |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP VGA 24LFCSP |
| 设计资源： | Extending the Dynamic Range of ADL5513 Logarithmic Detector Using AD8368 (CN0072) |
| 标准包装： | 64 |
| 系列： | X-AMP® |
| 放大器类型： | 可变增益 |
| 电路数： | 1 |
| -3db带宽： | 800MHz |
| 电流 - 电源： | 60mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 24-LFCSP-VQ（4x4） |
| 包装： | 托盘 - 晶粒 |
AD8368
Rev. B | Page 16 of 20
The choice of CDETO is a compromise of averaging time constant,
response time, and carrier leakage. If CDETO is selected to be too
small to speed up the response time, the AGC loop could start
tracking and leveling any amplitude envelope and corrupt the
constellation. Figure 38 illustrates a 16 QAM, 100 ksymbols per
second constellation with a degraded error vector magnitude
(EVM) of 5%. By increasing CDETO to 0.01 μF, the EVM is
improved to 1.1%.
STABILITY AND LAYOUT CONSIDERATIONS
In some applications, the printed circuit board (PCB) parasitic, in
combination with the source impedance presented by the driving
stage, can present some troublesome impedance at high frequency
and can potentially unstablize the amplifier under certain extreme
conditions, such as high gain and high temperature. To avoid such
scenarios, it is recommended to include a simple parallel RL
snubbing network directly at the input terminal of the AD8368.
Figure 40 depicts an example of this network. The RL network
formed by R3 and L1 is used to minimize the negative impact
due to reflective source conditions at high RF frequencies and
ensures the amplifier operates unconditionally stable and
maintains the typical device performance.
REF –4.9dBm
CF 100MHz
SR 10kHz
CONST DIAG
MEAS SIGNAL
16 QAM
1U
–1U
–1.31289U
262.578mU/
1.31289U
05
90
7-
0
40
On the underside of the chip scale package, there is an exposed
compressed paddle. This paddle is internally connected to the
ground of the chip. Solder the paddle to the low impedance ground
plane on the PCB to ensure specified electrical performance and to
provide thermal relief. It is also recommended that the ground
planes on all layers under the paddle be stitched together with
vias to reduce thermal impedance.
Figure 38. Degraded Error Vector Magnitude Performance for 16 QAM at
100 ksymbols per second (CDETO Too Small)
Figure 39 illustrates the measured EVM performance for a 16 QAM
modulation at 10 Msymbols per second using CDETO = 1 nF.
10
0
1
2
3
4
5
6
7
8
9
–40
–30
–20
–10
0
10
20
EV
M
(
%
)
POWER IN (dBm)
05
90
7-
0
41
Figure 39. Error Vector Magnitude Performance for
16 QAM 10 Msymbols per second
相关PDF资料 |
PDF描述 |
|---|---|
| AD8369ARUZ-REEL7 | IC AMP VGA 16TSSOP |
| AD8370ARE-REEL7 | IC AMP VGA DIFF LN 16TSSOP |
| AD8372ACPZ-R7 | IC AMP VGA DIFF DUAL LN 32LFCSP |
| AD8375ACPZ-R7 | IC AMP VGA DIFF ULDIST 24LFCSP |
| AD8376ACPZ-R7 | IC AMP VGA DIFF DUAL 32LFCSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8368-EVALZ | 制造商:Analog Devices 功能描述:EVAL BD 800 MHZ, LINEAR-IN-DB VGA W/ AGC DETECTOR - Bulk 制造商:Analog Devices 功能描述:EVALUATION BOARD KIT |
| AD8369 | 制造商:AD 制造商全称:Analog Devices 功能描述:45 dB Digitally Controlled VGA LF to 600 MHz |
| AD8369ARM | 制造商:Analog Devices 功能描述:500 MHZ DIGITAL VGA - Bulk |
| AD8369ARU | 制造商:Analog Devices 功能描述:SP Amp Variable Gain Amp Single 5.5V 16-Pin TSSOP Tube 制造商:Rochester Electronics LLC 功能描述:TSSOP IF DIGITAL CONTROL VGA - Bulk 制造商:Analog Devices 功能描述:IC SEMICONDUCTOR ((NS)) |
| AD8369ARU-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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