參數(shù)資料
型號： MAX4144
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 通用總線功能
英文描述： High-Speed, Low-Distortion, Differential Line Receivers
中文描述： LINE DRIVER, PDSO14
封裝： SO-14
文件頁數(shù)： 12/16頁
文件大小： 212K
代理商： MAX4144
M
High-S peed, Low-Distortion,
Differential Line Rec eivers
12
______________________________________________________________________________________
Figure 2 shows the connection for R
G
. R
G
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 S ENS E
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
R
SENSE
and
R
REF
are the SENSE and REF
trace impedances, respectively. R is 700
for the
MAX4144 and MAX4145, and 100
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
R
REF
and
R
SENSE
into this
equation, we can see that if changes in
R
REF
and
R
SENSE
are equal, CMR is not degraded.
Driving Capac itive 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
700
700
+
R
+
R
R
REF
REF
+
+
A
= 1
2
700
R
R
1
700
700
+
R
+
R
R
V
SENSE
REF
REF
+
+
+
G = A = 1 + 1.4k
R
(MAX4145)
G = A = 10 + 14k
R
(MAX4146)
G
G
100k
1M
10M
100M
1G
-3
-4
-5
-2
FREQUENCY (Hz)
G
-1
0
1
2
3
4
5
C
L
= 10pF
C
L
= 5pF
C
L
= 15pF
Figure 4. MAX4144 Small-Signal Response with Capacitive
Load
SENSE
OUT
REF
R
L
MAX4144
MAX4145
MAX4146
Figure 3. Connection of SENSE and REF to a Remote Load
IN-
R
G
IN+
MAX4145
MAX4146
Figure 2. Connection of R
G
in MAX4146
相關(guān)PDF資料
PDF描述
MAX4144-MAX4146 High-Speed, Low-Distortion, Differential Line Receivers
MAX4144EEE High-Speed, Low-Distortion, Differential Line Receivers
MAX4144ESD High-Speed, Low-Distortion, Differential Line Receivers
MAX4145EEE High-Speed, Low-Distortion, Differential Line Receivers
MAX4145ESD High-Speed, Low-Distortion, Differential Line Receivers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX4144_09 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:High-Speed, Low-Distortion, Differential Line Receivers
MAX4144EEE 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
MAX4144EEE+ 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
MAX4144EEE+T 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
MAX4144EEE-T 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
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