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參數(shù)資料
| 型號： | MAX4206EVKIT |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL KIT FOR MAX4206 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 對數(shù) |
| 輸出類型： | 單端 |
| 轉(zhuǎn)換速率： | 12 V/µs |
| 電流 - 輸出 / 通道： | 58mA |
| 工作溫度： | 0°C ~ 70°C |
| 電流供應(yīng)（主 IC）： | 5mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 11 V，±2.7 V ~ 5.5 V |
| 板類型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX4206，MAX4207 |
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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