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參數資料
| 型號： | AD8307 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier(對數放大器) |
| 中文描述： | 低成本DC - 500兆赫，九十二分貝對數放大器（對數放大器） |
| 文件頁數： | 1/20頁 |
| 文件大小： | 303K |
| 代理商： | AD8307 |
REV. 0
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.
a
AD8307
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1997
LowCost DC-500 MHz, 92 dB
Logarithmc Amplifier
FUNCT IONAL BLOCK DIAGRAM
BANDGAP REFERENCE
AND BIASING
SIX 14.3dB 900MHz
AMPLIFIER STAGES
MIRROR
INPUT-OFFSET
COMPENSATION LOOP
COMMON
–INPUT
+INPUT
SUPPLY
ENABLE
INT. ADJ
OUTPUT
OFS. ADJ.
AD8307
7.5mA
1.15k
V
3
2
2
m
A
/dB
12.5k
V
COM
NINE DETECTOR CELLS
SPACED 14.3dB
INT
ENB
OUT
OFS
COM
INM
INP
VPS
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 Min at 7.5 mA Typical
DC-500 MHz Operation,
6
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
m
A 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
PRODUCT DE SCRIPT ION
T he AD8307 is the first logarithmic amplifier in an 8-lead (SO-8)
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 compo-
nents. 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 con-
trol pin can disable the AD8307 to a standby current of under
150
μ
A.
Each of the cascaded amplifier/limiter cells has a small-signal
gain of 14.3 dB, with a –3 dB bandwidth of 900 MHz. T he
input is fully differential and at a moderately high impedance
(1.1 k
in parallel with about 1.4 pF). T he AD8307 provides a
basic dynamic range extending from approximately –75 dBm
(where dBm refers to a 50
source, that is, a sine amplitude of
–85 dBV or about
±
56
μ
V) up to +17 dBm (a sine amplitude of
+6.8 dBV or
±
2.2 V). A simple input-matching network can
lower this range to –88 dBm to +3 dBm. T he logarithmic lin-
earity is typically within
±
0.3 dB up to 100 MHz over the central
portion of this range, and is degraded only slightly at 500 MHz.
T here is no minimum frequency limit; the AD8307 may be
used at audio frequencies (20 Hz) or even lower.
T he output is a voltage scaled 25 mV/dB, generated by a current
of nominally 2
μ
A/dB through an internal 12.5 k
resistor. T his
voltage varies from 0.25 V at an input of –74 dBm (that is, the
ac intercept is at –84 dBm, a 20
μ
V rms sine input), up to 2.5 V
for an input of +16 dBm. T his slope and intercept can be trimmed
using external adjustments. Using a 2.7 V supply, the output
scaling may be lowered, for example to 15 mV/dB, to permit
utilization of the full dynamic range.
T he AD8307 exhibits excellent supply insensitivity and tem-
perature stability of the scaling parameters. T he unique combi-
nation 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, make this prod-
uct useful in numerous applications requiring the reduction of a
signal to its decibel equivalent.
T he AD8307 is available in the industrial temperature range of
–40
°
C to +85
°
C, and in 8-lead SOIC and PDIP packages.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8307_06 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier |
| AD8307AN | 功能描述:IC LOGARITHMIC AMP 8-DIP RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| AD8307ANZ | 功能描述:IC LOGARITHMIC AMP 8-DIP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| AD8307AR | 功能描述:IC LOGARITHMIC AMP 92DB 8-SOIC RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| AD8307AR-REEL | 功能描述:IC LOGARITHMIC AMP 8-SOIC T/R RoHS:否 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
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