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| 型号： | ADL5504ACBZ-P2 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 检测器 |
| 英文描述： | 450 MHz - 6000 MHz RF/MICROWAVE LINEAR DETECTOR |
| 封装： | 1.20 X 0.80 MM, ROHS COMPLIANT, CB-6-8, WLCSP-6 |
| 文件页数： | 6/24页 |
| 文件大小： | 1156K |
| 代理商： | ADL5504ACBZ-P2 |
ADL5504
Rev. A | Page 14 of 24
APPLICATIONS INFORMATION
BASIC CONNECTIONS
Figure 34 shows the basic connections for the ADL5504. The
device is powered by a single supply between 2.5 V and 3.3 V,
with a quiescent current of 1.8 mA. The VPOS pin is decoupled
using 100 pF and 0.1 F capacitors.
Placing a single 75 Ω resistor at the RF input provides a
broadband match of 50 . More precise resistive or reactive
matches can be applied for narrow frequency band use (see
the RF Input Interfacing section).
The rms averaging can be augmented by placing additional
capacitance at CFLTR. The ac residual can be reduced further by
increasing the output capacitance, COUT. The combination of
the internal 100 output resistance and COUT produces a low-
pass filter to reduce output ripple of the VRMS output (see the
section for more details).
RFIN
CFLTR
+VS = 2.5V TO 3.3V
VRMS
ROUT
0.1F
100pF
COUT
FLTR
VPOS
RFIN
ENBL
VRMS
COMM
ADL5504
1
2
3
6
5
4
R10
75
08437-
034
Figure 34. Basic Connections for ADL5504
RF INPUT INTERFACING
The input impedance of the ADL5504 decreases with increasing
frequency in both its resistive and capacitive components (see
Figure 9). The resistive component varies from 370 Ω at 900 MHz
to about 240 Ω at 2600 MHz.
A number of options exist for input matching. For operation
at multiple frequencies, a 75 Ω shunt to ground, as shown in
Figure 35, provides the best overall match. For use at a single
frequency, a resistive or a reactive match can be used. By plotting
the input impedance on a Smith chart, the best value for a
resistive match can be calculated. (Both input impedance and
input capacitance can vary by up to ±20% around their nominal
values.) Where VSWR is critical, the match can be improved
with a series inductor placed before the shunt component.
ADL5504
RFIN
RF TRANSMISSION LINE
50
DIRECTIONAL
COUPLER
75
ATTN
08437-
035
Figure 35. Input Interfacing to Directional Coupler
Resistive Tap RF Input
Figure 36 shows a technique for coupling the input signal into
the ADL5504 that can be applicable when the input signal is
much larger than the input range of the ADL5504. A series
resistor combines with the input impedance of the ADL5504
to attenuate the input signal. Because this series resistor forms
a divider with the frequency-dependent input impedance, the
apparent gain changes greatly with frequency. However, this
method has the advantage of very little power being tapped
off in RF power transmission applications. If the resistor is
large compared with the impedance of the transmission line,
the VSWR of the system is relatively unaffected.
ADL5504
RFIN
RF TRANSMISSION LINE
RSERIES
08437-
036
Figure 36. Attenuating the Input Signal
The resistive tap or series resistance, RSERIES, can be expressed as
RSERIES = RIN (1 10ATTN/20)/(10ATTN/20)
(1)
where:
RIN is the input resistance of RFIN.
ATTN is the desired attenuation factor in decibels.
For example, if a power amplifier with a maximum output power
of 28 dBm is matched to the ADL5504 input at 5 dBm, then a
23 dB attenuation factor is required. At 900 MHz, the input
resistance, RIN, is 370 .
RSERIES = (370 )(1 1023/20)/(1023/20) = 4870
(2)
Thus, for an attenuation of 23 dB, a series resistance of
approximately 4.87 k is needed.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADL5504ACBZ-P7 | 功能描述:IC DETECTOR RF/IF TRUPWR 6WLCSP RoHS:是 类别:RF/IF 和 RFID >> RF 检测器 系列:TruPwr™ 产品变化通告:Product Discontinuation 15/May/2006 标准包装:3,000 系列:- 频率:100MHz ~ 2GHz RF 型:手机，GSM，DCS，PCS 输入范围:- 精确度:- 电源电压:2.7 V ~ 5.5 V 电流 - 电源:300µA 包装:带卷 (TR) 封装/外壳:SC-74，SOT-457 其它名称:NCS5000SNT1GOS |
| ADL5504-EVALZ | 制造商:Analog Devices 功能描述:EVALUATION BOARDS - Bulk |
| ADL5504XCBZ | 功能描述:IC DETECTOR RF TRUPWR 制造商:analog devices inc. 系列:* 零件状态:上次购买时间 标准包装:1 |
| ADL5505 | 制造商:AD 制造商全称:Analog Devices 功能描述:450 MHz to 6000Mhz TruPwr Detector |
| ADL5505ACBZ-P2 | 制造商:AD 制造商全称:Analog Devices 功能描述:450 MHz to 6000Mhz TruPwr Detector |
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