参数资料
| 型号： | MAX4206ETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/17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 |
| 电压 - 输入偏移： | 1000µV |
| 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 |
| 产品目录页面： | 1388 (CN2011-ZH PDF) |
MAX4206
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
12
______________________________________________________________________________________
IBIAS1 and IBIAS2 are currents in the order of 20pA, sig-
nificantly smaller than ILOG and IREF, and can therefore
be eliminated:
Expanding this expression:
The first term of this expression is the ideal component
of VLOGV1. The remainder of the expression is the TE:
In the second term, one can generally remove the
products relating to K, because K is generally much
less than 1. Hence, a good approximation for TE is
given by:
As an example, consider the following situation:
Full-scale input = 5V
ILOG = 100A
IREF = 100nA
K = 1 ±5% V/decade (note that the uncommitted ampli-
fier is configured for a gain of 4)
VLC = ±5mV (obtained from the Electrical Character-
istics table)
VOSOUT = ±2mV (typ)
TA = +25°C
Substituting into the total error approximation,
TE ± (1V/decade)(0.05log10 (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 con-
tributing to total error. For further accuracy, consider tem-
perature 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
leakage 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
MAX4206 incorporates leakage current compensation
and high-current correction circuits to compensate for
these errors.
Frequency Compensation
The MAX4206’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 = 100pF and RCOMP = 100.
Where high bandwidth at low current is required, CCOMP
= 32pF and RCOMP = 330 are suitable compen-
sation values.
TE
K
I
VV
LOG
REF
LC
OSOUT
±
±±
±
()
log10
4
TE
K K
I
KK
V
LOG
REF
LC
OSOUT
±
±±
±
()
log
(
)
10
41
VK
I
KK
I
KK
V
LOGV
LOG
REF
LOG
REF
LC
OSOUT
210
10
41
±
±±
±
()
log
(
)
VK
K
I
VV
LOGV
LOG
REF
LC
OSOUT
210
14
±
±±
±
()
() log
IDEAL TRANSFER FUNCTION
WITH VARYING IREF
MAX4206
fig04
ILOG (A)
OUTPUT
VOLTAGE
(V)
100
1
10
100n
10n
-1.0
-0.5
0
0.5
1.0
1.5
-1.5
1n
1m
IREF = 100A
IREF = 1A
IREF = 10nA
Figure 4. Ideal Transfer Function with Varying IREF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4206ETE+ | 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 |
| MAX4206ETE+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 |
| MAX4206ETE-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 |
| MAX4206EVKIT | 功能描述:放大器 IC 开发工具 Transimpedance w/ 100Db Dynamic Range 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 |
| 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 |
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