參數(shù)資料
型號： MAX4206ETE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 運動控制電子
英文描述： Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range
中文描述： LOG OR ANTILOG AMPLIFIER, QCC16
封裝： 4 X 4 MM, 0.8 MM HEIGHT, MO-220-WGGC, TQFN-16
文件頁數(shù)： 12/17頁
文件大?。?/td> 1241K
代理商： MAX4206ETE
M
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
12
______________________________________________________________________________________
I
BIAS1
and I
BIAS2
are currents on the order of 20pA,
significantly smaller than I
LOG
and I
REF
, and can there-
fore be eliminated:
Expanding this expression:
The first term of this expression is the ideal component
of V
LOGV1
. The remainder of the expression is the total
error, 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
I
LOG
= 100μA
I
REF
= 100nA
K = 1 ±5% V/decade (note that the uncommitted ampli-
fier is configured for a gain of 4)
V
LC
= ±5mV (obtained from the
Electrical Character-
istics
table)
V
OSOUT
= ±2mV (typ)
T
A
= +25°C
Substituting into the total error approximation,
TE
± (1V/decade)(0.05log
10
(100μA/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 I
LOG
and I
REF
. The effects of
leakage currents increase as I
LOG
and I
REF
fall below
10nA. Bandwidth decreases at low I
LOG
values (see
the
Frequency Response and Noise Considerations
section). As I
LOG
and I
REF
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 C
COMP
and R
COMP
ensures stability
over the specified range of input currents by introducing
an additional pole/zero to the system. For the typical
application, select C
COMP
= 100pF and R
COMP
= 100
.
Where high bandwidth at low current is required, C
COMP
= 32pF and R
COMP
= 330
are suitable compen-
sation values.
TE
K
K
I
I
V
V
LOG
REF
LC
OSOUT
±
±
±
±
(
)
log
10
4
TE
K K
I
I
K
K
V
V
LOG
REF
LC
OSOUT
±
±
±
±
±
(
)
log
(
)
10
4 1
V
K
I
I
K K
I
I
)
K
K
V
V
LOGV
LOG
REF
)
LOG
REF
LC
OSOUT
2
10
10
4 1
±
±
±
±
±
(
log
log
(
V
K
K
I
I
V
V
LOGV
LOG
REF
LC
OSOUT
2
10
1
(
4
±
±
±
±
(
)
) log
IDEAL TRANSFER FUNCTION
WITH VARYING I
REF
M
I
LOG
(A)
O
100
μ
1
μ
10
μ
100n
10n
-1.0
-0.5
0
0.5
1.0
1.5
-1.5
1n
1m
I
REF
= 100
μ
A
I
REF
= 1
μ
A
I
REF
= 10nA
Figure
4. Ideal Transfer Function with Varying I
REF
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4206ETE+ 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
MAX4206ETE+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
MAX4206ETE-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
MAX4206EVKIT 功能描述:放大器 IC 開發(fā)工具 Transimpedance w/ 100Db Dynamic Range 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
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
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