参数资料
| 型号： | AD8307AR-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC LOGARITHMIC AMP 8-SOIC T/R |
| 标准包装： | 2,500 |
| 类型： | 对数放大器 |
| 应用： | 接收器信号强度指示（RSSI） |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
Low Cost, DC to 500 MHz, 92 dB
Logarithmic Amplifier
AD8307
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
1997–2008 Analog Devices, Inc. All rights reserved.
FEATURES
Complete multistage logarithmic amplifier
92 dB dynamic range: –75 dBm to +17 dBm
to –90 dBm using matching network
Single supply of 2.7 V minimum at 7.5 mA typical
DC to 500 MHz operation,
±1 dB linearity
Slope of 25 mV/dB, intercept of 84 dBm
Highly stable scaling over temperature
Fully differential dc-coupled signal path
100 ns power-up time, 150 μA sleep current
APPLICATIONS
Conversion of signal level to decibel form
Transmitter antenna power measurement
Receiver signal strength indication (RSSI)
Low cost radar and sonar signal processing
Network and spectrum analyzers (to 120 dB)
Signal level determination down to 20 Hz
True decibel ac mode for multimeters
FUNCTIONAL BLOCK DIAGRAM
BAND GAP REFERENCE
AND BIASING
SIX 14.3dB 900MHz
AMPLIFIER STAGES
MIRROR
INPUT-OFFSET
COMPENSATION LOOP
COM
INM
INP
ENB
VPS
INT
OUT
OFS
AD8307
7.5mA
1.1k
3
2
2A
/dB
12.5k
COM
NINE DETECTOR CELLS
SPACED 14.3dB
–INP
+INP
8
1
2
7
5
6
4
3
0
10
82
-00
1
Figure 1.
GENERAL DESCRIPTION
The AD8307 is the first logarithmic amplifier made available in
an 8-lead (SOIC_N) package. It is a complete 500 MHz monolithic
demodulating logarithmic amplifier based on the progressive
compression (successive detection) technique, providing a
dynamic range of 92 dB to ±3 dB law-conformance and 88 dB
to a tight ±1 dB error bound at all frequencies up to 100 MHz.
It is extremely stable and easy to use, requiring no significant
external components. A single-supply voltage of 2.7 V to 5.5 V
at 7.5 mA is needed, corresponding to an unprecedented power
consumption of only 22.5 mW at 3 V. A fast acting CMOS-
compatible control pin can disable the AD8307 to a standby
current of less than 150 μA.
Each of the cascaded amplifier/limiter cells has a small signal
gain of 14.3 dB, with a 3 dB bandwidth of 900 MHz. The input
is fully differential and at a moderately high impedance (1.1 kΩ
i
n parallel with about 1.4 pF). The AD8307 provides a basic
dynamic range extending from approximately 75 dBm (where
dBm refers to a 50 Ω source, that is, a sine amplitude of about
±56 μV) up to +17 dBm (a sine amplitude of ±2.2 V). A simple
input matching network can lower this range to –88 dBm to
+3 dBm. The logarithmic linearity is typically within ±0.3 dB up
to 100 MHz over the central portion of this range, and degrades
only slightly at 500 MHz. There is no minimum frequency limit.
The AD8307 can be used at audio frequencies of 20 Hz or lower.
The output is a voltage scaled 25 mV/dB, generated by a current
of nominally 2 μA/dB through an internal 12.5 kΩ resistor. This
voltage varies from 0.25 V at an input of 74 dBm (that is, the
ac intercept is at 84 dBm, a 20 μV rms sine input), up to 2.5 V
for an input of +16 dBm. This slope and intercept can be trimmed
using external adjustments. Using a 2.7 V supply, the output
scaling can be lowered, for example to 15 mV/dB, to permit
utilization of the full dynamic range.
The AD8307 exhibits excellent supply insensitivity and temperature
stability of the scaling parameters. The unique combination of
low cost, small size, low power consumption, high accuracy and
stability, very high dynamic range, and a frequency range
encompassing audio through IF to UHF makes this product
useful in numerous applications requiring the reduction of a
signal to its decibel equivalent.
The AD8307 operates over the industrial temperature range of
40°C to +85°C, and is available in 8-lead SOIC and 8-lead
PDIP packages.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8307AR-REEL7 | 功能描述:IC LOGARITHMIC AMP 8-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 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 |
| AD8307ARZ | 功能描述:IC LOGARITHMIC AMP 92DB 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 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 |
| AD8307ARZ | 制造商:Analog Devices 功能描述:Logarithmic Amplifier IC |
| AD8307ARZ-REEL | 功能描述:IC AMP LOGARITHMIC 8SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 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 |
| AD8307ARZ-RL7 | 功能描述:IC AMP LOGARITHMIC 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 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 |
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