參數(shù)資料
型號(hào)： MAX4206ETE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range
中文描述： LOG OR ANTILOG AMPLIFIER, QCC16
封裝： 4 X 4 MM, 0.8 MM HEIGHT, MO-220-WGGC, TQFN-16
文件頁(yè)數(shù)： 10/17頁(yè)
文件大小： 1241K
代理商： MAX4206ETE
M
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
10
______________________________________________________________________________________
Detailed Description
Theory
Figure 2 shows a simplified model of a logarithmic
amplifier. Two transistors convert the currents applied
at LOGIIN and REFIIN to logarithmic voltages accord-
ing to the following equation:
where:
V
BE
= base-emitter voltage of a bipolar transistor
k = 1.381 x 10
-23
J/K
T = absolute temperature (K)
q = 1.602 x 10
–19
C
I
C
= collector current
I
S
= reverse saturation current
The logarithmic amplifier compares V
BE1
to the refer-
ence voltage V
BE2
, which is a logarithmic voltage for a
known reference current, I
REF
. The temperature depen-
dencies of a logarithmic amplifier relate to the thermal
voltage, (KT/q), and I
S
. Matched transistors eliminate
the I
S
temperature dependence of the amplifier in the
following manner:
V
V
V
kT
q
I
I
kT
q
I
I
kT
q
I
I
I
I
kT
q
I
I
OUT
BE
BE
LOG
S
REF
S
LOG
S
REF
S
LOG
REF
=
=
=
=
1
2
ln
ln
ln
ln
ln
=
(
=
×
kT
q
I
I
K
I
I
see Figure
LOG
REF
LOG
REF
ln(
) log
10
log
(
)
3
10
10
V
kT
q
I
I
BE
C
S
=
ln
MAX4206
LOGIIN
CMVIN
V
CC
REFIIN
V
CC
CURRENT
CORRECTION
V
CC
LOGV1
SCALE
OSADJ
LOGV2
V
CC
V
CC
REFISET
CURRENT MIRROR
CMVOUT
REFVOUT
REFIOUT
GND
V
EE
0.5V
1.238V
V
EE
V
EE
SUMMING
AMPLIFIER
AND
TEMPERATURE
COMPENSATION
Figure 1. Functional Diagram
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MAX4206 Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4206ETE+ 功能描述:對(duì)數(shù)放大器 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
MAX4206ETE+T 功能描述:對(duì)數(shù)放大器 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
MAX4206ETE-T 功能描述:對(duì)數(shù)放大器 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:Texas Instruments 通道數(shù)量:3 帶寬:3 dB 共模抑制比（最小值）: 輸入補(bǔ)償電壓:+/- 7 mV 輸入電壓范圍（最大值）:5.5 V 工作電源電壓:4.5 V to 5.5 V 電源電流:+/- 15 mA 工作溫度范圍:- 40 C to +85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
MAX4206EVKIT 功能描述:放大器 IC 開發(fā)工具 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
MAX4206EVKIT+ 功能描述:放大器 IC 開發(fā)工具 MAX4206 EVAL KIT RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
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