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参数资料
| 型号： | MAX4206EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/17页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX4206 |
| 标准包装： | 1 |
| 系列： | * |
MAX4206
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
______________________________________________________________________________________
11
where:
K = scale factor (V/decade)
ILOG = the input current at LOGIIN
IREF = 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
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
MAX4206’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 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, VLOGV1, from the ideal transfer function (see
the 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 VLC and VOSOUT 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 ILOG
and IREF. Because the MAX4206 is configured with
a gain of K = 0.25V/decade, a 4 should multiply the
(±VLC ±VOSOUT) term, if VLC and VOSOUT were derived
from this default configuration.
VK
K
II
VV
LOGV
LOG
BIAS
REF
BIAS
LC
OSOUT
210
1
2
14
=±
±±
±
()
() log
VV
TE
LOGV
IDEAL
1 =±
VK
I
IDEAL
LOG
REF
=×
log10
LOGIIN
CMVIN
VCC
REFIIN
VCC
VBE1
VBE2
VEE
ILOG
IREF
Figure 2. Simplified Model of a Logarithmic Amplifier
IDEAL TRANSFER FUNCTION
WITH VARYING K
MAX4206
fig03
CURRENT RATIO (ILOG/IREF)
NORMALIZED
OUTPUT
VOLTAGE
(V)
10
0.1
-2
-3
-1
0
1
2
3
4
-4
0.001
1000
VOUT = K LOG (ILOG/IREF)
K = 1
K = 0.5
K = 0.25
Figure 3. Ideal Transfer Function with Varying K
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相关代理商/技术参数 |
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| MAX4206EVKIT+ | 功能描述:放大器 IC 开发工具 MAX4206 EVAL KIT RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX4207ETE | 功能描述:对数放大器 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4207ETE+ | 功能描述:对数放大器 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4207ETE+T | 功能描述:对数放大器 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4207ETE-T | 功能描述:对数放大器 Transimpedance w/ 100Db Dynamic Range RoHS:否 制造商:Texas Instruments 通道数量:3 带宽:3 dB 共模抑制比（最小值）: 输入补偿电压:+/- 7 mV 输入电压范围（最大值）:5.5 V 工作电源电压:4.5 V to 5.5 V 电源电流:+/- 15 mA 工作温度范围:- 40 C to +85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
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