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參數(shù)資料
| 型號： | MAX4190 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single/Triple, Low-Glitch, 250MHz, Current- Feedback Amplifiers with High-Speed Disable |
| 中文描述： | 單/三路、低毛刺、250MHz、電流反饋放大器，帶有高速禁止功能 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 212K |
| 代理商： | MAX4190 |
M
S ingle/Triple, Low-Glitc h, 250MHz, Current-
Feedbac k Amplifiers with High-S peed Disable
16
______________________________________________________________________________________
amplifiers achieve very high isolation from input to output
(65dB at 10MHz), and the outputs are placed into a high-
impedance state. These amplifiers achieve low switch-
ing-transient glitches (<45mVp-p) when switching
between enable and disable modes. Fast enable/disable
times (120ns/35ns), along with high off-isolation and low
switching transients, allow these devices to be used as
high-performance, high-speed multiplexers. This is
achieved by connecting the outputs of multiple amplifiers
together and controlling the
DISABLE
inputs to enable
one amplifier and disable all others. The disabled ampli-
fiers present a very light load (1μA leakage current and
3.5pF capacitance) to the active amplifier’s output. The
feedback network impedance of all the disabled ampli-
fiers must still be considered when calculating the total
load on the active amplifier output. Figure 1 shows an
application circuit using the MAX4188 as a 3:1 video mul-
tiplexer.
The
DISABLE_
logic threshold is typically V
CC
- 2.5V,
independent of V
EE
. For a single +5V supply or dual
±5V supplies, the disable inputs are CMOS-logic com-
patible. The amplifiers default to the enabled mode if
the
DISABLE
pin is left unconnected. If the
DISABLE
pin is left floating, take proper care to ensure that no
high-frequency signals are coupled to this pin, as this
may cause false triggering.
Applic ations Information
T heory of Operation
The MAX4188/MAX4189/MAX4190 are current-feedback
amplifiers, and their open-loop transfer function is
expressed as a transimpedance,
V
OUT
/
I
IN
, or T
Z
. The
frequency behavior of the open-loop transimpedance is
similar to the open-loop gain of a voltage-mode feedback
amplifier. That is, it has a large DC value and decreases
at approximately 6dB per octave.
Analyzing the follower with gain, as shown in Figure 2,
yields the following transfer function:
V
OUT
/ V
IN
= G x [(T
Z
(S) / T
Z
(s) + G x (R
IN
+ R
F
)]
where G = A
VCL
= 1 + (R
F
/ R
G
), and R
IN
= 1/g
M
300
.
At low gains, G x R
IN
< R
F
. Therefore, the closed-loop
bandwidth is essentially independent of closed-loop
gain. Similarly T
Z
> R
F
at low frequencies, so that:
V
V
OUT
IN
(
1
/
)
=
=
G
R
R
F
G
V
IN
R
G
R
IN
T
Z
R
F
+1
+1
V
OUT
MAX4188
MAX4189
MAX4190
Figure 2. Current-Feedback Amplifier
AMP1
6
7
5
560
75
V
IN
1
560
1.0
μ
F
1.0
μ
F
0.1
μ
F
4
11
+5V
-5V
0.1
μ
F
87
AMP2
13
14
12
9
10
DISABLE2
DISABLE3
DISABLE1
560
75
V
IN
2
560
V
OUT
87
75
75
CABLE
8
1
2
3
560
75
V
IN
3
560
87
MAX4188
AMP3
Figure 1. High-Speed 3:1 Video Multiplexer
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4190EEE | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:OP-AMP|SINGLE|BIPOLAR|TSSOP|8PIN|PLASTIC |
| MAX4190ESA | 功能描述:運(yùn)算放大器 - 運(yùn)放 Integrated Circuits (ICs) 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 |
| MAX4190ESA+ | 功能描述:運(yùn)算放大器 - 運(yùn)放 185MHz 1.5mA Current-Feedback 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 |
| MAX4190ESA+T | 功能描述:運(yùn)算放大器 - 運(yùn)放 185MHz 1.5mA Current-Feedback 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 |
| MAX4190ESA-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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