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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： | 8/24页 |
| 文件大小： | 1156K |
| 代理商： | ADL5504ACBZ-P2 |
ADL5504
Rev. A | Page 16 of 24
OUTPUT DRIVE CAPABILITY AND BUFFERING
The ADL5504 is capable of sourcing a VRMS output current of
approximately 3 mA. The output current is sourced through the
on-chip, 100 series resistor; therefore, any load resistor forms
a voltage divider with this on-chip resistance. It is recommended
that the ADL5504 VRMS output drive high resistance loads to
preserve output swing. If an application requires driving a low
resistance load (as well as in cases where increasing the nominal
conversion gain is desired), a buffering circuit is necessary.
SELECTING THE SQUARE-DOMAIN FILTER AND
OUTPUT LOW-PASS FILTER
The internal filter capacitor of the ADL5504 provides averaging
in the square domain but leaves some residual ac on the output.
Signals with high peak-to-average ratios, such as W-CDMA or
CDMA2000, can produce ac residual levels on the ADL5504
VRMS dc output. To reduce the effects of these low frequency
components in the waveforms, some additional filtering is
required.
The square-domain filter capacitance of the ADL5504 can be
augmented by connecting a capacitor between Pin 1 (FLTR) and
Pin 2 (VPOS). In addition, the VRMS output of the ADL5504 can
be filtered directly by placing a capacitor between VRMS (Pin 5)
and ground. The combination of the on-chip, 100 output
series resistance and the external shunt capacitor forms a low-
pass filter to reduce the residual ac.
Figure 39 and Figure 40 show the effects on the residual ripple
vs. the output and square-domain filter capacitor values at two
communication standards with high peak-to-average ratios.
Note that there is a trade-off between ac residual and response
time. Large filter capacitances increase the turn-on and pulse
response times (see Figure 28 to Figure 33). Figure 41 shows the
effect of the two filtering options, the output filter and the
square-domain filter capacitor, on the pulse response time of
the ADL5504. For more information on the effects of the filter
capacitances on the response, see the Power Consumption,
0
100
1
10
100
1000
CAPACITANCE (nF)
AC
RE
S
IDUAL
(
mV
p
-p
)
90
80
70
60
50
40
30
20
10
CFLTR
COUT
08437-
039
Figure 39. AC Residual vs. CFLTR and COUT,
W-CDMA Reverse Link (5.8 dB CF) Waveform
0
50
100
150
200
250
300
350
400
1
10
100
1000
CAPACITANCE (nF)
AC
RE
S
IDUAL
(
mV
p
-p
)
CFLTR
COUT
08437-
040
Figure 40. AC Residual vs. CFLTR and COUT,
W-CDMA Forward Link (11.7 dB CF) Waveform
0
25
50
75
100
125
150
175
200
225
250
100
200
300
400
500
600
700
800
900
1000
C
O
UT
R
ESPO
N
SE
T
IME
(
s)
0
1
10
100
1000
CAPACITANCE (nF)
C
FLTR
R
ESPO
N
SE
T
IME
(
s)
CFLTR
COUT
08437-
041
Figure 41. CFLTR and COUT Response Time vs. Capacitance
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相关代理商/技术参数 |
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|---|---|
| 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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