参数资料
| 型号： | MAX4207ETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/15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
______________________________________________________________________________________
11
Substituting into the TE approximation,
TE ± (1V/decade)(0.05 log10 (100A/100nA)
±4 (±5mV ±2mV) = ±[0.15V ±4(±7mV)]
As a worst case, one finds TE ±178mV or ±3.6% of
full scale.
When expressed as a voltage, TE increases in proportion
with an increase in gain as the contributing errors are
defined at a specific gain. Calibration using a look-up
table eliminates the effects of gain and output offset
errors, leaving conformity error as the only factor
contributing to total error. For further accuracy, consider
temperature monitoring as part of the calibration process.
Applications Information
Input Current Range
Five decades of input current across a 10nA to 1mA
range are acceptable for ILOG and IREF. The effects of
bias currents increase as ILOG and IREF fall below
10nA. Bandwidth decreases at low ILOG values (see
the Frequency Response and Noise Considerations
section). As ILOG and IREF increase to 1mA or higher,
transistors become less logarithmic in nature. The
MAX4207 incorporates leakage current compensation
and high-current correction circuits to compensate for
these errors.
Frequency Compensation
The MAX4207’s frequency response is a function of the
input current magnitude and the selected compensation
network at LOGIIN and REFIIN. The compensation net-
work comprised of CCOMP and RCOMP ensures stability
over the specified range of input currents by introducing
an additional pole/zero to the system. For the typical
application, select CCOMP = 32pF and RCOMP = 330.
Frequency Response and Noise Considerations
The MAX4207 bandwidth is proportional to the magnitude
of the IREF and ILOG currents, whereas the noise is
inversely proportional to IREF and ILOG currents.
Common Mode
A 0V common-mode input voltage, VCMVOUT, is avail-
able at CMVOUT and can be used to bias the logging
and reference amplifier inputs by connecting CMVOUT
to CMVIN. A voltage between 0 and 0.5V, connected to
CMVIN, may be used to bias the logging and reference
transistor collectors, thereby optimizing performance.
Adjusting the Logarithmic Intercept
Adjust the logarithmic intercept by changing the refer-
ence current, IREF. A resistor from REFISET to GND
(see Figure 5) adjusts the reference current, according
to the following equation:
where VREFISET is 0.5V. Select RSET between 5k and
5M. REFIOUT current range is 10nA to 10A only.
Dual-Supply Operation
The MAX4207 operates only from dual ±2.7 to ±5.5V sup-
plies. The relationship of inputs to outputs is a function of
IREF, relative to ILOG, and the configuration of the uncom-
mitted amplifier. The uncommitted amplifier can be con-
figured in either inverting or noninverting mode. In an
inverting configuration, the uncommitted amplifier output,
LOGV2, is positive and LOGV1 is negative when ILOG
exceeds IREF. When operating in a noninverting configu-
ration, LOGV2 and LOGV1 are both negative when ILOG
exceeds IREF (see Table 1). An inverting configuration of
the uncommitted buffer is recommended when large out-
put offset voltage adjustments are required using OSADJ.
By connecting CMVOUT and CMVIN, the log and refer-
ence amplifier inputs (LOGIIN and REFIIN) are biased at
0V. Applying the external voltage (0 to 0.5V) to CMVIN
optimizes the application’s performance.
R
V
I
SET
REFISET
REF
=
×
10
MAX4207
VEE
GND
REFIIN
REFIOUT
LOGIIN
REFISET
SCALE
LOGV2
LOGV1
CMVIN
CMVOUT
VCC
RCOMP
330
CCOMP
32pF
RSET
50k
R1
10k
R2
4k
0.1F
IIN
0.1F
VOUT
RCOMP
330
CCOMP
32pF
OSADJ
REFVOUT
R4
R3
Figure 5. Typical Operating Circuit
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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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