參數(shù)資料
型號(hào)： MAX4206ETE
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 運(yùn)動(dòng)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(yè)數(shù)： 13/17頁(yè)
文件大小： 1241K
代理商： MAX4206ETE
M
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
______________________________________________________________________________________
13
Frequency Response and Noise Considerations
The MAX4206 bandwidth is proportional to the magni-
tude of the I
REF
and I
LOG
currents, whereas the noise is
inversely proportional to I
REF
and I
LOG
currents.
Common Mode
A common-mode input voltage, V
CMVOUT
, of 0.5V is
available at CMVOUT and can be used to bias the log-
ging and reference amplifier inputs by connecting
CMVOUT to CMVIN. An external voltage between 0.5V
and 1V can be applied to CMVIN to bias the logging
and reference transistor collectors and to optimize the
performance required for both single- and dual-supply
operation.
Adjusting the Logarithmic Intercept
Adjust the logarithmic intercept by changing the refer-
ence current, I
REF
. A resistor from REFISET to GND
(see Figures 5 and 6) adjusts the reference current,
according to the following equation:
where V
REFISET
is 0.5V. Select R
SET
between 5k
and
5M
. REFIOUT current range is 10nA to 10μA only.
Single-Supply Operation
When operating from a single +2.7V to +11V supply,
I
LOG
must be greater than I
REF
, resulting in a positive
slope of the log output voltages, LOGV1 and LOGV2.
Bias the log and reference amplifiers by connecting
CMVOUT to CMVIN or connecting an external voltage
reference between 0.5V and 1V to CMVIN. For single-
supply operation, connect V
EE
to GND.
Output Offset
Select R
OS
and I
OS
to adjust the output offset voltage
(see Figure 5). The magnitude of the offset voltage is
given by:
V
OS
= R
OS
I
OSADJ
Scale Factor
The scale factor, K, is the slope of the logarithmic out-
put. For the LOGV1 amplifier, K = 0.25V/decade. When
operating in a single-supply configuration, adjust the
overall scale factor for the MAX4206 using the uncom-
mitted LOGV2 amplifier and the following equation,
which refers to Figure 5:
Select R1 between 1k
and 100k
, with an ideal value
of 10k
. The noninverting amplifier ensures that the
overall scale factor is greater than or equal to
0.25V/decade for single-supply operation.
Design Example
Desired:
Single-Supply Operation
Logarithmic intercept: 100nA
Overall scale factor = 1V/decade
Because there is no offset current applied to the circuit
(R
OS
= 0
), the reference current, I
REF
, equals the log
intercept of 100μA. Therefore,
Select R
1
= 10k
:
Dual-Supply Operation
When operating from dual ±2.7 to ±5.5V supplies, it is
not required that I
LOG
be greater than I
REF
. A positive
output voltage results at LOGV1 when I
LOG
exceeds
I
REF
. A negative output voltage results at LOGV1 when
I
LOG
is less than I
REF
. Bias the log and reference
amplifiers by connecting CMVOUT to CMVIN or con-
nect an external 0.5V to 1V reference to CMVIN. For
dual-supply operation with CMVIN < 0.5V, refer to the
MAX4207 data sheet.
Output Offset
The uncommitted amplifier in the inverting configuration
utilized by the MAX4206 facilitates large output-offset
voltage adjustments when operated with dual supplies.
The magnitude of the offset voltage is given by the fol-
lowing equation:
A resistive divider between REFVOUT, OSADJ, and
GND can be used to adjust V
OSADJ
(see Figure 6).
V
V
R
R
R
OSADJ
REFOUT
=
+
4
3
4
V
V
R
R
OS
OSADJ
=
+
1
2
1
R
k
V V
1
0 25
.
k
2 10
1
30
=
/
R
V
nA
k
SET
=
=
0 5
.
10 100
500
R
R
K
.
2
1
0 25
1
=
R
V
10
I
SET
REFISET
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(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
MAX4206ETE+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
MAX4206ETE-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
MAX4206EVKIT 功能描述:放大器 IC 開(kāi)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(píng)估:IR4302 工作電源電壓:13 V to 23 V
MAX4206EVKIT+ 功能描述:放大器 IC 開(kāi)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
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