參數(shù)資料
型號： MAX4206EVKIT+
廠商： Maxim Integrated Products
文件頁數(shù)： 2/17頁
文件大?。?/td> 0K
描述： EVAL KIT MAX4206
標(biāo)準(zhǔn)包裝： 1
系列： *
MAX4206
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:
VBE = 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
IC = collector current
IS = reverse saturation current
The logarithmic amplifier compares VBE1 to the refer-
ence voltage VBE2, which is a logarithmic voltage for a
known reference current, IREF. The temperature depen-
dencies of a logarithmic amplifier relate to the thermal
voltage, (kT/q), and IS. Matched transistors eliminate
the IS temperature dependence of the amplifier in the
following manner:
VV
V
kT
q
I
kT
q
I
kT
q
I
kT
q
I
OUT
BE
LOG
S
REF
S
LOG
S
REF
S
LOG
REF
=
=
=
=
12
ln
=
()
=×
kT
q
I
K
I
see Figure
LOG
REF
LOG
REF
ln(
)
log
(
)
10
3
10
V
kT
q
I
BE
C
S
=
ln
MAX4206
LOGIIN
CMVIN
VCC
REFIIN
VCC
CURRENT
CORRECTION
VCC
LOGV1
SCALE
OSADJ
LOGV2
VCC
REFISET
CURRENT MIRROR
CMVOUT
REFVOUT
REFIOUT
GND
VEE
0.5V
1.238V
VEE
SUMMING
AMPLIFIER
AND
TEMPERATURE
COMPENSATION
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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 工具用于評估:IR4302 工作電源電壓:13 V to 23 V
MAX4207ETE 功能描述:對數(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
MAX4207ETE+ 功能描述:對數(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
MAX4207ETE+T 功能描述:對數(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
MAX4207ETE-T 功能描述:對數(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
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