參數(shù)資料
型號(hào)： MAX4207ETE
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
文件頁數(shù)： 10/15頁
文件大?。?/td> 386K
代理商： MAX4207ETE
M
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
10
______________________________________________________________________________________
Total Error
Total error (TE) is defined as the deviation of the output
voltage, V
LOGV1
, from the ideal transfer function (see
the
Transfer Function
section):
TE is a combination of the associated gain, input offset
current, input bias current, output offset voltage, and
transfer characteristic nonlinearity (log conformity)
errors:
where V
LC
and V
OSOUT
are the log conformity and out-
put offset voltages, respectively. Output offset is defined
as the offset occurring at the output of the MAX4207
when equal currents are presented to I
LOG
and I
REF
.
Because the MAX4207 is configured with a gain of K =
-0.25V/decade, a 4 should multiply the (±V
LC
±V
OSOUT
)
term, if V
LC
and V
OSOUT
were derived from this default
configuration.
I
BIAS1
and I
BIAS2
are currents in the order of 20pA, sig-
nificantly smaller than I
LOG
and I
REF
, and can therefore
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 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 Characteristics
table)
V
OSOUT
= ±2mV (typ), and T
A
= +25°C.
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
V
K
K
I
I
I
I
V
V
LOGV
LOG
REF
BIAS
BIAS
LC
OSOUT
2
10
1
2
1
(
4
=
±
±
±
±
(
)
) log
-
-
V
V
TE
LOGV
IDEAL
1
=
±
IDEAL TRANSFER FUNCTION
WITH VARYING K
M
CURRENT RATIO (I
LOG
/I
REF
)
N
100
1
10
0.1
0.01
-2
-3
-1
0
1
2
3
4
-4
0.001
1000
V
OUT
= K LOG (I
LOG
/I
REF
)
K = 1
K = 0.5
K = 0.25
K = -0.25
K = -0.5
K = -1
Figure 3. Ideal Transfer Function with Varying K
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
K = -0.25
I
REF
= 100
μ
A
I
REF
= 10nA
I
REF
= 1
μ
A
Figure 4. Ideal Transfer Function with Varying IREF
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參數(shù)描述
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
MAX4208AUA+ 功能描述:儀表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk
MAX4208AUA+T 功能描述:儀表放大器 Low Offset/Drift Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk
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