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參數(shù)資料
| 型號(hào)： | MAX4113 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers |
| 中文描述： | 單/雙/四路、400MHz、低功耗、電流反饋放大器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 167K |
| 代理商： | MAX4113 |
Choosing Feedbac k and Gain Resistors
The MAX4112/MAX4113/MAX4117–MAX4120 are cur-
rent feedback amplifiers. Increasing feedback resistor
values will decrease peaking. Use the input resistor
(R
G
) to change the magnitude of the gain. Figure 2
shows the standard inverting and noninverting configu-
rations. Notice that the gain of the noninverting circuit
(Figure 2b) is 1 plus the magnitude of the inverting
closed-loop gain (Table 1).
DC and Noise Errors
There are several major error sources to consider in
any operational amplifier. These apply equally to the
MAX4112/MAX4113/MAX4117–MAX4120. Offset-error
terms are given by the equation below. Voltage and
current-noise errors are root-square summed and
therefore computed separately. In Figure 3, the total
output offset voltage is determined by:
a) The input offset voltage (V
OS
) times the closed-loop
gain (1 + (R
F
/ R
G
)).
b) The positive input bias current (I
B+
) times the source
resistor (R
S
) (usually 50
or 75
), plus the negative
input bias current (I
B-
) times the parallel combination
of R
G
and R
F
. In current-mode feedback amplifiers,
the input bias currents may flow into or out of the
device. For this reason, there is no benefit to match-
ing the resistance at both inputs.
The equation for total DC error is:
[
c) The total output-referred noise voltage is:
The MAX4112/MAX4117/MAX4119 have a very low,
2nV/
√
Hz
noise voltage. The current noise at the positive
input (i
n+
) is 13pA/
√
Hz
, and the current noise at the
inverting input (i
n-
) is 14pA/
√
Hz
.
An example of the DC error calculations, using the
MAX4112 typical data and the typical operating circuit
where R
F
= R
G
= 600
(R
F
||
R
G
= 300
) and R
S
= 50
,
gives the following:
V
OUT
= (3.5 x 10
-6
x 50 + 3.5 x 10
-6
x 300 + 10
-3
) (1 + 1)
V
OUT
= 4.45mV
Calculating total output noise in a similar manner yields:
)
+
(
=
With a 200MHz system bandwidth, this calculates to
133μV
RMS
(approximately 797μVp-p, choosing the six-
sigma value).
Resistor T ypes
Surface-mount resistors are the best choice for high-
frequency circuits. They are of similar material to metal-
film resistors, but are deposited using a thick-film
process in a flat, linear manner that minimizes induc-
tance. Their small size and lack of leads also minimizes
parasitic inductance and capacitance, yielding more
predictable performance.
Metal-film resistors with leads are manufactured using
a thin-film process where resistive material is deposited
in a spiral layer around a ceramic rod. Although the
materials used are noninductive, the spiral winding pre-
sents a small inductance (about 5nH) that may have an
adverse effect on high-frequency circuits.
Carbon-composition resistors with leads are manufac-
tured by pouring the resistor material into a mold. This
process yields relatively low-inductance resistors that
are very useful in high-frequency applications, although
they tend to cost more and have more thermal noise
than other types. The ability of carbon-composition
resistors to self-heal after a large current overload
makes them useful in high-power RF applications.
For general-purpose use, surface-mount metal-film
resistors seem to have the best overall performance for
low cost, low inductance, and low noise.
V ideo Line Driver
The MAX4112/MAX4113/MAX4117–MAX4120 are opti-
mized (gain flatness) to drive coaxial transmission lines
when the cable is terminated at both ends, as shown in
Figure 4. Cable frequency response can cause varia-
tions in the flatness of the signal.
e
1 1
(
13x10
x50
14x10
x300
2x10
e
9.4nV
Hz
n(OUT)
12
2
12
2
92
)
n(OUT)
/
=
)
(
)
+
(
e
R
R
i
R
)
i
R
)
R
e
n OUT
(
F
G
n
S
n
F
G
n
)
||
=
+
(
[
]
+
(
[
]
+
(
)
+
1
2
2
2
V
I
B
R
)
I
B
R
R
V
1+R
]
R
OUT
S
F
G
OS
F
G
||
=
(
+
(
)
(
)
+
+
M
S ingle/Dual/Quad, 400MHz, Low-Power,
Current Feedbac k Amplifiers
______________________________________________________________________________________
11
R
G
I
B
-
I
B
+
V
OUT
R
F
R
S
MAX4112
MAX4113
MAX4117
MAX4118
MAX4119
MAX4120
Figure 3. Output Offset Voltage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4113ESA | 功能描述:高速運(yùn)算放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4113ESA+ | 功能描述:高速運(yùn)算放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4113ESA+T | 功能描述:高速運(yùn)算放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4113ESA-T | 功能描述:高速運(yùn)算放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4117 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Single/Dual/Quad, 400MHz, Low-Power, Current Feedback Amplifiers |
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