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AD641AP

更新时间： 2024-11-28 22:38:59
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亚德诺 - ADI 放大器
页数 文件大小 规格书
16页 259K
描述
250 MHz Demodulating Logarithmic Amplifier

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中文翻译

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AD641AP 数据手册

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250 MHz Demodulating  
Logarithmic Amplifier  
a
AD641  
FEATURES  
PIN CONFIGURATIONS  
Logarithmic Amplifier Performance  
Usable to 250 MHz  
44 dB Dynamic Range  
20-Lead Plastic DIP (N)  
20-Lead Cerdip (Q)  
؎2.0 dB Log Conformance  
37.5 mV/dB Voltage Output  
Stable Slope and Intercepts  
2.0 nV/√Hz Input Noise Voltage  
50 ␮V Input Offset Voltage  
Low Power  
؎5 V Supply Operation  
9 mA (+VS), 35 mA (–VS) Quiescent Current  
Onboard Resistors  
1
2
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
–INPUT  
ATN LO  
ATN COM  
ATN COM  
ATN IN  
+INPUT  
ATN OUT  
CKT COM  
RG1  
3
4
5
RG0  
AD641  
TOP VIEW  
(Not to Scale)  
6
BL1  
RG2  
7
–V  
S
LOG OUT  
LOG COM  
8
ITC  
BL2  
Onboard 10
؋
 Attenuator  
Dual Polarity Current Outputs  
Direct Coupled Differential Signal Path  
9
+V  
S
10  
–OUTPUT  
+OUTPUT  
APPLICATIONS  
20-Lead PLCC (P)  
IF/RF Signal Processing  
Received Signal Strength Indicator (RSSI)  
High Speed Signal Compression  
High Speed Spectrum Analyzer  
ECM/Radar  
3
2
1
20 19  
PIN 1  
IDENTIFIER  
ATN COM  
ATN IN  
BL1  
4
5
6
7
8
18  
17  
16  
15  
14  
CKT COM  
RG1  
PRODUCT DESCRIPTION  
AD641  
TOP VIEW  
(Not to Scale)  
The AD641 is a 250 MHz, demodulating logarithmic amplifier  
with an accuracy of ±2.0 dB and 44 dB dynamic range. The  
AD641 uses a successive detection architecture to provide an  
output current that is logarithmically proportional to its input  
voltage. The output current can be converted to a voltage using  
one of several on-chip resistors to select the slope. A single  
AD641 provides up to 44 dB of dynamic range at speeds up to  
250 MHz, and two cascaded AD641s together can provide  
58 dB of dynamic range at speeds up to 250 MHz. The AD641  
is fully stable and well characterized over either the industrial or  
military temperature ranges.  
RG0  
–V  
S
RG2  
ITC  
LOG OUT  
9
10 11 12 13  
The 250 MHz bandwidth and temperature stability make this  
product ideal for high speed signal power measurement in RF/  
IF systems. ECM/Radar and Communication applications are  
routinely in the 100 MHz–180 MHz range for power measure-  
ment. The bandwidth and accuracy, as well as dynamic range,  
make this part ideal for high speed, wide dynamic range signals.  
The AD641 is not a logarithmic building block, but rather a  
complete logarithmic solution for compressing and measuring  
wide dynamic range signals. The AD641 is comprised of five  
stages and each stage has a full wave rectifier, whose current  
depends on the absolute value of its input voltage. The output  
of these stages are summed together to provide the demodulated  
output current scaled at 1 mA per decade (50 µA/dB).  
The AD641 is offered in industrial (–40°C to +85°C) and mili-  
tary (–55°C to +125°C) package temperature ranges. Industrial  
versions are available in plastic DIP and PLCC; MIL versions  
are packaged in cerdip.  
Without utilizing the 10× input attenuator, log conformance of  
2.0 dB is maintained over the input range –44 dBm to 0 dBm.  
The attenuator offers the most flexibility without significantly  
impacting performance.  
REV. C  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  
1234567...16

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AD641AP 替代型号

型号 品牌 替代类型 描述 数据表
AD641APZ ADI

完全替代

 250 MHz Demodulating Logarithmic Amplifier
AD641AP-REEL7 ADI

完全替代

 250 MHz Demodulating Logarithmic Amplifier

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