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參數(shù)資料
| 型號(hào)： | MAX4207ETE+T |
| 廠(chǎng)商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 15/15頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP TRANS LOG 16-TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類(lèi)型： | 對(duì)數(shù) |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 12 V/µs |
| 增益帶寬積： | 5MHz |
| -3db帶寬： | 1MHz |
| 電流 - 輸入偏壓： | 10pA |
| 電壓 - 輸入偏移： | 600µV |
| 電流 - 電源： | 5mA |
| 電流 - 輸出 / 通道： | 58mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 11 V，±2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 16-WQFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
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MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
_______________________________________________________________________________________
9
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:
where:
k = scale factor (V/decade)
ILOG = the input current at LOGIIN
IREF = the reference current at REFIIN
The MAX4207 uses internal temperature compensation
to virtually eliminate the effects of the thermal voltage,
(kT/q), on the amplifier’s scale factor, maintaining a
constant slope over temperature.
Definitions
Transfer Function
The ideal logarithmic amplifier transfer function is:
Adjust K (see the Scale Factor section) to increase the
transfer-function slope as illustrated in Figure 3. Adjust
IREF using REFISET (see the Adjusting the Logarithmic
Intercept section) to shift the logarithmic intercept to
the left or right as illustrated in Figure 4.
Log Conformity
Log conformity is the maximum deviation of the
MAX4207’s output from the best-fit straight line of the
VLOGV1 versus log (ILOG/IREF) curve. It is expressed as
a percent of the full-scale output or an output voltage.
Referred-to-Input and Referred-to-Output Errors
The log nature of the MAX4207 insures that any addi-
tive error at LOGV1 corresponds to multiplicative error
at the input, regardless of input level.
VK
I
IDEAL
LOG
REF
=×
log10
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
LOG
REF
LOG
REF
ln(
) log
log
10
V
kT
q
I
BE
C
S
=
ln
LOGIIN
CMVIN
VCC
REFIIN
VCC
VBE1
VBE2
VEE
ILOG
IREF
Figure 2. Simplified Model of a Logarithmic Amplifier
(see Figure 3)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SMBJ58C-E3/5B | TVS BIDIR 600W 58V 10% SMB |
| MAX4206ETE+T | IC AMP TRANS LOG 16-TQFN |
| SMBJ58-E3/5B | TVS UNIDIR 600W 58V 10% SMB |
| SMBJ54HE3/5B | TVS UNIDIR 600W 54V 10% SMB |
| SMBJ54-E3/5B | TVS UNIDIR 600W 54V 10% SMB |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MAX4208AUA+T | 功能描述:儀表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| MAX4208EVKIT+ | 功能描述:放大器 IC 開(kāi)發(fā)工具 MAX4208 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| MAX4209EVKIT+ | 功能描述:放大器 IC 開(kāi)發(fā)工具 MAX4209 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| MAX4209HAUA+ | 功能描述:儀表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
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