參數(shù)資料
型號： THS4504DGKR
廠商： Texas Instruments, Inc.
元件分類： 運動控制電子
英文描述： WIDEBAND, LOW-DISTORTION, FULLY DIFFERENTIAL AMPLIFIERS
中文描述： 寬帶，低失真，全差分放大器
文件頁數(shù)： 21/38頁
文件大?。?/td> 1094K
代理商： THS4504DGKR
www.ti.com
V
OUT
V
IN
(1–
β
)–V
IN–
(1–
β
)
2V
OCM
β
2
β
V
OUT–
–V
IN
(1–
β
)
V
IN–
(1–
β
)
2
β
2V
OCM
β
(1)
(2)
V
N
V
IN–
(1–
β
)
V
OUT
β
Where:
β
R
G
R
F
R
G
V
P
V
IN
(1–
β
)
V
OUT–
β
(3)
(4)
(5)
V
OCM
+V
S
V
S
R
S
R
g1
R
g2
R
f1
R
f2
+
R
T
+
Application Circuit for the THS4500 and THS4501,
Featuring Single-Supply Operation With a
Ground-Referenced Input Signal
V
OCM
R
g
R
g
R
f
R
f
+
+
V
p
V
n
V
OUT
V
OUT+
V
IN+
V
IN
Diagram For Input Common-Mode Range Equations
V
OCM
+V
S
V
S
R
S
R
g1
R
g2
R
f1
R
f2
+
R
T
+
V
S
Application Circuit for the THS4500 and THS4501,
Featuring Split-Supply Operation With an Input
Signal Referenced at the Midrail
THS4504
THS4505
SLOS363C–AUGUST 2002–REVISED MARCH 2004
NOTE:
Figure 75.
The equations denote the
device inputs as V
and
V
P
, and the
circuit
inputs
as V
IN+
and V
IN-
.
Figure 77.
Table 1 and Table 2 show the input common-mode
range requirements for two different input scenarios,
an input referenced around the negative rail and an
input referenced around midrail. The tables highlight
the differing requirements on input common-mode
range, and illustrate reasoning for choosing either the
THS4500/1 or the THS4502/3. For signals referenced
around the negative power supply, the THS4500/1
should be chosen since its input common-mode
range includes the negative supply rail. For all other
situations, the THS4502/3 offers slightly improved
distortion and noise performance for applications with
input signals centered between the power supply
rails.
Figure 76.
Equations 1-5 allow calculation of the required input
common-mode range for a given set of input con-
ditions.
The equations allow calculation of the input common-
mode range requirements given information about the
input signal, the output voltage swing, the gain, and
the output common-mode voltage. Calculating the
maximum and minimum voltage required for V
and
V
P
(the amplifier's input nodes) determines whether
or not the input common-mode range is violated or
not. Four equations are required. Two calculate the
output voltages and two calculate the node voltages
at V
N
and V
P
(note that only one of these needs
calculation, as the amplifier forces a virtual short
between the two nodes).
Table 1. Negative-Rail Referenced
Gain (V/V)
1
2
4
8
V
IN+
(V)
-2.0 to 2.0
-1.0 to 1.0
-0.5 to 0.5
-0.25 to 0.25
V
IN-
(V)
0
0
0
0
V
IN
(V
PP
)
4
2
1
0.5
V
OCM
(V)
2.5
2.5
2.5
2.5
V
OD
(V
PP
)
4
4
4
4
V
NMIN
(V)
0.75
0.5
0.3
0.167
V
NMAX
(V)
1.75
1.167
0.7
0.389
21
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THS4504DGNG4 功能描述:特殊用途放大器 Wideband Lo-Noise Lo-Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel
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