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| 型号： | MAX4145ESD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC RX DIFF LINE HS 14-SOIC |
| 标准包装： | 2,500 |
| 类型： | 接收器 |
| 驱动器/接收器数： | 0/3 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
MAX4144/MAX4145/MAX4146
High-Speed, Low-Distortion,
Differential Line Receivers
12
______________________________________________________________________________________
Figure 2 shows the connection for RG. RG might simply
be a resistor, or it can be a complex pole-zero pair for
filter and shaping applications (Figure 9). Use surface-
mount gain-setting components to ensure stability.
Using REF and SENSE
The MAX4144/MAX4145/MAX4146 have a REF pin (nor-
mally connected to ground) and a SENSE pin (normally
connected to OUT). In some long-line applications, it
may be desirable to connect SENSE and OUT together
at the load, instead of the typical connection at the part
(Figure 3). This compensates for the long line’s resis-
tance, which otherwise leads to an IR voltage error.
When using this technique, keep the sense lines’
impedance low to minimize gain errors. Also, keep
capacitance low to maximize frequency response. The
gain of the MAX4144/MAX4145/MAX4146 output stage
is approximated by the following equation:
where
ΔRSENSE and ΔRREF are the SENSE and REF
trace impedances, respectively. R is 700
Ω for the
MAX4144 and MAX4145, and 100
Ω for the MAX4146.
Additionally, mismatches in the SENSE and REF traces
lead to common-mode gain errors. Common-mode
gain is approximated by the following equation:
Substituting numbers for
ΔRREF and ΔRSENSE into this
equation, we can see that if changes in
ΔRREF and
ΔRSENSE are equal, CMR is not degraded.
Driving Capacitive Loads
The MAX4144/MAX4145/MAX4146 provide maximum
AC performance when not driving an output load
capacitance. This is the case when driving a correctly
terminated transmission line (i.e., a back-terminated
cable). In most amplifier circuits, driving large load
capacitance increases the chance of oscillations. The
amplifier’s output impedance and the load capacitor
combine to add a pole and excess phase to the loop
response. If the pole’s frequency is low enough and
phase margin is degraded sufficiently, oscillations may
occur. A second concern when driving capacitive
loads results from the amplifier’s output impedance,
A=
R
-
R
R + 700
VCM
REF
SENSE
ΔΔ
Ω
700
R
700
R
REF
ΩΔ
+
++
A=
1
2
700
R
1
700
R
700
R
V
SENSE
REF
ΩΔ
+
++
G = A = 1 +
1.4k
R
(MAX4145)
G = A = 10 +
14k
R
(MAX4146)
V
G
V
G
Ω
100k
1M
10M
100M
1G
-3
-4
-5
-2
FREQUENCY (Hz)
GAIN
(dB)
-1
0
1
2
3
4
5
CL = 10pF
CL = 5pF
CL = 15pF
Figure 4. MAX4144 Small-Signal Response with Capacitive
Load
SENSE
OUT
REF
RL
MAX4144
MAX4145
MAX4146
Figure 3. Connection of SENSE and REF to a Remote Load
IN-
RG
IN+
MAX4145
MAX4146
Figure 2. Connection of RG in MAX4146
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4146 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Speed.Low-Distortion.Differential Line Receivers |
| MAX4146EEE | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| MAX4146EEE+ | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| MAX4146EEE+T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| MAX4146EEE-T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
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