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参数资料
| 型号： | MAX19790ETX+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/11页 |
| 文件大小： | 1625K |
| 描述： | IC 250MHZ - 4GHZ VAR ATTEN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 衰减值： | -4dB ~ -48dB |
| 频率范围： | 250MHz ~ 4GHz |
| 功率（瓦特）： | 2.1W |
| 阻抗： | 50 欧姆 |
| 封装/外壳： | 36-WQFN 裸露焊盘，36-HWQFN |
250MHz to 4000MHz Dual,
Analog Voltage Variable Attenuator
9
Detailed Description
The MAX19790 is a dual, general-purpose analog volt-
age variable attenuator (VVA) designed to interface
with 50I systems operating in the 250MHz to 4000MHz
frequency range. Each attenuator includes a control
circuit that provides 22dB of attenuation range with a
linear control slope of 10dB/V. Both attenuators share a
common analog control and can be cascaded together
to yield 44dB of total dynamic range, with a combined
linear control slope of 20dB/V.
Applications Information
Analog Attenuation Control
A single input voltage at the CTRL pin adjusts the attenu-
ation of the device. Up to 22dB of attenuation-control
range is provided per attenuator. At the insertion-loss
setting, the attenuators loss is approximately 2.4dB.
If a larger attenuation-control range is desired, the
second on-chip attenuator can be connected in series to
provide an additional 22dB of gain-control range.
Note that the CTRL pin simultaneously adjusts both
on-chip attenuators. The CTRL input voltage drives a
high-impedance load (> 50kI). It is suggested that a
current-limiting resistor be included in series with this
connection, to limit the input current to less than 40mA,
should the control voltage be applied when V
CC
is not
present. A series resistor of greater than 200I provides
complete protection for +5.0V control voltage ranges.
Note: To ensure the reliability of the device, limit CTRL
input voltages to a +1.0V to +4.0V range when V
CC
is
present.
Layout Considerations
A properly designed PCB is an essential part of any
RF/microwave circuit. Keep RF signal lines as short as
possible to reduce losses, radiation, and inductance.
For best performance, route the ground-pin traces
directly to the exposed pad underneath the package.
This pad MuST be connected to the ground plane of
the board by using multiple vias under the device to
provide the best RF and thermal conduction path. Solder
the exposed pad on the bottom of the device package
to a PCB.
Power-Supply Bypassing
Proper voltage-supply bypassing is essential for high-
frequency circuit stability. Bypass each V
CC
pin with
capacitors placed as close as possible to the device.
Place the smallest capacitor closest to the device. See
the Typical Application Circuit and Table 1 for details.
Table 1. Typical Application Circuit Component Values
*C8 can be used to provide additional filtering. Depending on the external driver used on the CTRL line, this capacitance could
slow down the response time.
DESIGNATION QTY
DESCRIPTION
C1, C3, C5
3
220pF Q5%, 50V C0G ceramic
capacitors (0402)
Murata GRM1555C1H221J
C2, C4
2
0.01FF Q10%, 25V X7R ceramic
capacitors (0402)
Murata GRM155R71E103K
C6
1
1000pF Q5%, 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H102J
C7
1
0.1FF Q10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C104K
C8*
0
Not installed, ceramic capacitor
(0603)
DESIGNATION QTY
DESCRIPTION
C9
1
22pF Q5%, 50V C0G ceramic
capacitor (0402)
Murata GRM1555C1H220J
R1, R2
2
10I Q5% resistors (0402)
Any
R3, R4
2
0I resistors (0402)
Note: In cases where V
CTRL
is
applied before or removed after
V
CC
, use R4 = 200I.
U1
1
Analog attenuator IC
Maxim MAX19790ETX+
Note: U1 has an exposed pad
conductor, which requires it to be
solder-attached to a grounded
pad on the PCB to ensure a
proper electrical/thermal design.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX19790ETX/GH9 | 功能描述:有源衰减器 RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
| MAX19790ETX+ | 功能描述:有源衰减器 250MHz - 4000MHz Attenuator RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
| MAX19790ETX+T | 功能描述:有源衰减器 250MHz - 4000MHz Attenuator RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
| MAX19790ETX+TW | 功能描述:有源衰减器 250MHz to 4000MHz Dual Analog Voltage Variable Attenuator RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
| MAX19790ETX+W | 功能描述:有源衰减器 Dual SiGe High-Linearity 1700MHz to 2200MHz Downconversion Mixer with LO Buffer/Switch RoHS:否 制造商:TriQuint Semiconductor 通道数量: 最大频率: 阻抗: 最大 VSWR: 位数: 最大工作温度: 最小工作温度: |
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