- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄385528 > MAX4206 (Maxim Integrated Products, Inc.) Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX4206 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | 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： | 高精度互阻對(duì)數(shù)放大器，動(dòng)態(tài)范圍大于105 |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大小： | 1241K |
| 代理商： | MAX4206 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)
M
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
______________________________________________________________________________________
11
where:
K = scale factor (V/decade)
I
LOG
= the input current at LOGIIN
I
REF
= the reference current at REFIIN
The MAX4206 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
I
REF
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
MAX4206’s output from the best-fit straight line of the
V
LOGV1
versus log (I
LOG
/I
REF
) 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 MAX4206 insures that any addi-
tive error at LOGV1 corresponds to multiplicative error
at the input, regardless of input level.
Total Error
Total error, TE, is defined as the deviation of the output
voltage, V
LOGV1
, from the ideal transfer function (see
the
Ideal Transfer Function
section):
Total error is a combination of the associated gain,
input offset current, input bias current, output offset
voltage, and transfer characteristic nonlinearity (log
conformity) errors:
where V
LC
and V
OSOUT
are the log conformity and out-
put offset voltages, respectively. Output offset is
defined as the offset occurring at the output of the
MAX4206 when equal currents are presented to I
LOG
and I
REF
. Because the MAX4206 is configured with
a gain of K = 0.25V/decade, a 4 should multiply the
(±V
LC
±V
OSOUT
) term, if V
LC
and V
OSOUT
were derived
from this default configuration.
V
K
K
I
I
I
I
V
V
LOGV
LOG
REF
BIAS
BIAS
LC
OSOUT
2
10
1
2
1
(
4
=
±
±
±
±
(
)
) log
V
V
TE
LOGV
IDEAL
1
=
±
V
K
I
I
IDEAL
LOG
REF
=
×
log
10
LOGIIN
CMVIN
V
CC
REFIIN
V
CC
V
BE1
V
BE2
V
EE
V
EE
I
LOG
I
REF
Figure
2. Simplified Model of a Logarithmic Amplifier
IDEAL TRANSFER FUNCTION
WITH VARYING K
M
CURRENT RATIO (I
LOG
/I
REF
)
N
10
0.1
-2
-3
-1
0
1
2
3
4
-4
0.001
1000
V
OUT
= K LOG (I
LOG
/I
REF
)
K = 1
K = 0.5
K = 0.25
Figure
3. Ideal Transfer Function with Varying K
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4238AUT-T | Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers |
| MAX4239AUT-T | Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers |
| MAX4238 | Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers |
| MAX4238ASA | Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers |
| MAX4239 | Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers |
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+ | 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(kāi)發(fā)工具 Transimpedance w/ 100Db Dynamic Range 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。