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參數(shù)資料
| 型號(hào)： | MAX4106-MAX4107 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 350MHz, Ultra-Low-Noise Op Amps |
| 中文描述： | 350MHz頻段，超低噪聲運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 128K |
| 代理商： | MAX4106-MAX4107 |
M
_______________General Desc ription
Choosing Resistor V alues
The values of the gain-setting feedback and input resis-
tors are important design considerations. Large resistor
values will increase voltage noise, and will interact with
the amplifier’s input and PC board capacitance to gen-
erate undesirable poles and zeros, which can decrease
bandwidth or cause oscillations. For example, a nonin-
verting gain of +5 (MAX4106), using a 1k
feedback
resistor combined with 2pF of input capacitance and
0.5pF of board capacitance, will cause a feedback
pole at 318MHz. If this pole is within the anticipated
amplifier bandwidth, it will jeopardize stability.
Reducing the 1k
feedback resistor to 40
will extend
the pole frequency to 8GHz, but could limit output
swing by adding 50
in parallel with the amplifier’s
load. Clearly the selection of resistor values must be
tailored to the specific application.
The MAX4106/MAX4107 are ultra-low-noise, high-band-
width op amps. The output noise voltage can be domi-
nated by resistor thermal noise, so keep the feedback
and input resistors small. Setting the input resistor to
30
and choosing the feedback resistor to suit the gain
will provide excellent AC performance without signifi-
cantly degrading noise performance.
Driving Capac itive Loads
The MAX4106/MAX4107 are optimized for AC perfor-
mance. They are not designed to drive highly reactive
loads. Reactive loads will decrease phase margin and
may produce excessive ringing and oscillation. Figure
1a shows a circuit that eliminates this problem, and
Figure 1b is a graph of the optimal isolation resistor
(R
S
) vs. capacitive load. Figures 2a and 2b show how a
capacitive load causes excessive peaking of the ampli-
fier’s bandwidth if the capacitive load is not isolated
(R
S
) from the amplifier. A small isolation resistor (usual-
ly 10
to 20
) placed before the reactive load prevents
ringing and oscillation. At higher capacitive loads, AC
performance will be controlled by the interaction of the
load capacitance and isolation resistor. Figures 3a and
3b show the effect of an isolation resistor on the
MAX4106/MAX4107 closed-loop response.
Coaxial cable and other transmission lines are easily
driven when terminated at both ends with their charac-
teristic impedance. When driving back-terminated
transmission lines, the capacitance of the transmission
line is essentially eliminated.
350MHz, Ultra-Low-Noise Op Amps
8
_______________________________________________________________________________________
_____________________Pin Desc ription
Amplifier Output
OUT
6
Positive Power Supply, connect to +5V
V
CC
7
Negative Power Supply, connect to -5V
V
EE
4
Noninverting Input
IN+
3
PIN
Inverting Input
IN-
2
No Connection, not internally connected
N.C.
1, 5, 8
FUNCTION
NAME
MAX4106
MAX4107
R
F
R
G
30
R
S
C
L
V
IN
PART
MAX4106
MAX4107
RF (
)
120
270
GAIN (V/V)
+5
+10
R
L
Figure 1a. Using an Isolation Resistor for High Capacitive
Loads
0
M
R
)
25
30
20
15
10
5
190
10
40
70
100 130
CAPACITANCE (pF)
160
220
MAX4106
MAX4107
Figure 1b. Optimal Isolation Resistor (R
S
) vs. Capacitive Load
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4107 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:350MHz, Ultra-Low-Noise Op Amps |
| MAX4107C/D | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4107ESA | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4107ESA+ | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4107ESA+T | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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