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参数资料
| 型号： | MAX4189EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/23页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 16-QSOP |
| 标准包装： | 2,500 |
| 应用： | 电流反馈 |
| 电路数： | 3 |
| -3db带宽： | 250MHz |
| 转换速率： | 175 V/µs |
| 电流 - 电源： | 1.5mA |
| 电流 - 输出 / 通道： | 55mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 11 V，±2.25 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
MAX4188/MAX4189/MAX4190
Single/Triple, Low-Glitch, 250MHz, Current-
Feedback Amplifiers with High-Speed 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 (1A 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 VCC - 2.5V,
independent of VEE. 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.
Applications Information
Theory of Operation
The MAX4188/MAX4189/MAX4190 are current-feedback
amplifiers, and their open-loop transfer function is
expressed as a transimpedance, VOUT/IIN, or TZ. 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:
VOUT / VIN = G x [(TZ (S) / TZ(s) + G x (RIN + RF)]
where G = AVCL = 1 + (RF / RG), and RIN = 1/gM
300.
At low gains, G x RIN < RF. Therefore, the closed-loop
bandwidth is essentially independent of closed-loop
gain. Similarly TZ > RF at low frequencies, so that:
V
OUT
IN
(
/
)
==
+
GR
R
FG
1
VIN
RG
RIN
TZ
RF
+1
VOUT
MAX4188
MAX4189
MAX4190
Figure 2. Current-Feedback Amplifier
AMP1
6
7
5
560
75
VIN1
560
1.0F
0.1F
4
11
+5V
-5V
0.1F
87
AMP2
13
14
12
9
10
DISABLE2
DISABLE3
DISABLE1
560
75
VIN2
560
VOUT
87
75
75
CABLE
8
12
3
560
75
VIN3
560
87
MAX4188
AMP3
Figure 1. High-Speed 3:1 Video Multiplexer
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4189ESD | 功能描述:视频放大器 RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX4189ESD+ | 功能描述:视频放大器 250MHz 1.5mA Current-Feedback RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX4189ESD+T | 功能描述:视频放大器 250MHz 1.5mA Current-Feedback RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX4189ESD-T | 功能描述:视频放大器 RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| MAX418C/D | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1.2レA Max, Single/Dual/Quad, Single-Supply Op Amps |
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