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參數(shù)資料
| 型號(hào)： | MAX4206EVKIT+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 4/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL KIT MAX4206 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
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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| 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(píng)估:IR4302 工作電源電壓:13 V to 23 V |
| MAX4207ETE | 功能描述:對(duì)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(bǔ)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(duì)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(bǔ)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(duì)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(bǔ)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(duì)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(bǔ)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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