参数资料
| 型号： | MAX4207ETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/15页 |
| 文件大小： | 0K |
| 描述： | IC AMP TRANS LOG 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 放大器类型： | 对数 |
| 电路数： | 1 |
| 转换速率： | 12 V/µs |
| 增益带宽积： | 5MHz |
| -3db带宽： | 1MHz |
| 电流 - 输入偏压： | 10pA |
| 电压 - 输入偏移： | 600µV |
| 电流 - 电源： | 5mA |
| 电流 - 输出 / 通道： | 58mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 11 V，±2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 管件 |
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)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX4208AUA+ | 功能描述:仪表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
| MAX4208AUA+T | 功能描述:仪表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
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