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| 型号： | AD8334-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 43/56页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD8334 |
| 标准包装： | 1 |
| 系列： | X-AMP® |
| 每 IC 通道数： | 4 - 四 |
| 放大器类型： | 可变增益 |
| 输出类型： | 差分 |
| 转换速率： | 650 V/µs |
| -3db带宽： | 100MHz |
| 电流 - 输出 / 通道： | 45mA |
| 工作温度： | -40°C ~ 85°C |
| 电流供应（主 IC）： | 29.5mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | AD8334 |
| 相关产品： | AD8334ACPZ-ND - IC VGA QUAD W/PREAMP 64LFCSP AD8334ACPZ-REEL7DKR-ND - IC VGA QUAD W/PREAMP 64-LFCSP AD8334ACPZ-REEL7CT-ND - IC VGA QUAD W/PREAMP 64-LFCSP AD8334ACPZ-REEL7TR-ND - IC VGA QUAD W/PREAMP 64-LFCSP AD8334ACPZ-REEL-ND - IC VGA QUAD W/PREAMP 64-LFCSP |
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AD8331/AD8332/AD8334
Rev. G | Page 48 of 56
CONFIGURING THE INPUT IMPEDANCE
The board is built and tested using the components shown in
black in Figure 115. Provisions are made for optional components
(shown in gray) that can be installed at user discretion. As
shipped, the input impedances of the low noise amplifiers (LNAs)
are configured for 50 Ω to match the output impedances of most
signal generators and network analyzers. Input impedances up to
6 kΩ can be realized by changing the values of the feedback
resistors, RFB1, RFB2, RFB3, RFB4, and shunt capacitors, C6, C8, C10,
and C12. For reference, Table 12 lists standard values of 1%
resistors for some typical values of input impedance. Of course,
if the user has determined that the source impedance falls
between these values, the feedback resistor value can be
calculated accordingly. Note that the board is designed to accept
standard surface-mount, size 0603 components.
Table 12. LNA External Component Values for Common
Source Impedances
RIN (Ω)
RFB1, RFB2, RFB3, RFB4 (Ω, ±1%)
C6, C8, C10, C12 (pF)
50
274
22
75
412
12
100
562
8
200
1.13 k
1.2
500
3.01 k
No capacitor
6 k
No resistor
No capacitor
Driving the VGA from an External Source or Using the
LNA to Drive an External Load
Appropriate components can be installed if the user wants to
drive the VGA directly from an external source or to evaluate
the LNA output. If the LNA is used to drive off-board loads
or cables, small value series resistors (47 Ω to 100 Ω) are
recommended for LNA decoupling. These can be installed
in the R10, R11, R14, R15, R18, R19, R22, and R23 spaces.
Provisions are made for surface-mount SMA connectors that
can be used for driving from either direction. If the LNA is not
used, it is recommended that the capacitors, C16, C17, C21,
C22, C26, C27, C31, and C32, be carefully removed to avoid
driving the outputs of the LNAs.
Using the Clamp Circuit
The board is shipped with no resistors installed in the spaces
provided for clamp-circuit operation. Note that each pair of
channels shares a clamp resistor. If the output clamping is
desired, the resistors are installed in R49 and R50. The peak-to-
peak clamping level is application dependent.
Viewing Signals
The preferred signal detector is a high impedance differential
probe, such as the Tektronix P6247, 1 GHz differential probe,
connected to the 2-pin headers (VO1, VO2, VO3, or VO4), as
shown in Figure 116. The low capacitance of this probe has the
least effect on the performance of the device of any detection
method tried. The probe can also be used for monitoring input
signals at IN1, IN2, IN3, or IN4. It can be used for probing
other circuit nodes; however, be aware that the 200 kΩ input
impedance can affect certain circuits.
Differential-to-single-ended transformers are provided for
single-ended output connections. Note that series resistors are
provided to protect against accidental output overload should a
50 Ω load be connected to the connector. Of course, the effect
of these resistors is to limit the bandwidth. If the load connected
to the SMA is >500 Ω, the 237 Ω series resistors, RX1, RX2, RX3,
RX4, RX5, RX6, RX7, and RX8, can be replaced with 0 Ω values.
03
19
9-
1
23
Figure 114. AD8334-EVALZ Assembly
MEASUREMENT SETUP
The basic board connections for measuring bandwidth are
shown in Figure 116. A 5 V, 200 mA (minimum) power supply
is required, and a low noise voltage reference supply is required
for VGAIN.
BOARD LAYOUT
The evaluation board circuitry uses four conductor layers. The
two inner layers are ground, and all interconnecting circuitry is
located on the outer layers. Figure 117 to Figure 120 illustrate
the copper patterns.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8335 | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad Low Noise, Low Cost Variable Gain Amplifier |
| AD8335ACPZ | 功能描述:IC AMP VGA QUAD 64LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:X-AMP® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8335ACPZ-REEL | 功能描述:IC AMP VGA QUAD 64LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:X-AMP® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8335ACPZ-REEL7 | 功能描述:IC AMP VGA QUAD 64LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:X-AMP® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| AD8335EVAL | 制造商:Analog Devices 功能描述:EVAL BOARD ((NS)) |
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