參數(shù)資料
型號： TS612IDDT
廠商： STMICROELECTRONICS
元件分類： 運算放大器
英文描述： DUAL OP-AMP, 10000 uV OFFSET-MAX, 130 MHz BAND WIDTH, PDSO20
封裝： BATWING, PLASTIC, MICRO, SO-20
文件頁數(shù)： 8/10頁
文件大?。?/td> 131K
代理商： TS612IDDT
TS612
8/10
For the ADSL upstream path, a lowpass filter is
absolutely necessary to cutoff the higher frequen-
cies from the DAC analog output. In this simple
non-inverting amplification configuration, it will be
easy to implement a Sallen-Key lowpass filter by
using the TS612. For ADSL over POTS, a maxi-
mum frequency of 135kHz is reached. For ADSL
over ISDN, the maximum frequency will be
276kHz.
INCREASING THE LINE LEVEL BY USING AN
ACTIVE IMPEDANCE MATCHING
With passive matching, the output signal ampli-
tude of the driver must be twice the amplitude on
the load. To go beyond this limitation an active
maching impedance can be used. With this tech-
nique it is possible to keep good impedance
matching with an amplitude on the load higher
than the half of the ouput driver amplitude. This
concept is shown in figure3 for a differential line.
Figure 3 :
TS612 as a differential line driver with
an active impedance matching
Component calculation:
Let us consider the equivalent circuit for a single
ended configuration, figure4.
Figure 4 :
Single ended equivalent circuit
Let us consider the unloaded system. Assuming
the currents through R1, R2 and R3
as respectively:
As Vo° equals Vo without load, the gain in this
case becomes :
The gain, for the loaded system will be (1):
As shown in figure5, this system is an ideal gener-
ator with a synthesized impedance as the internal
impedance of the system. From this, the output
voltage becomes:
with Ro the synthesized impedance and Iout the
output current. On the other hand Vo can be ex-
pressed as:
2
1
2
R
3
By identification of both equations (2) and (3), the
synthesized impedance is, with Rs1=Rs2=Rs:
R4
R2
Vi
Vi
Vo
Vo
RL
100
1:n
Hybrid
&
Transformer
GND
Vcc+
10
μ
100n
100n
100n
1k
1k
Rs1
Rs2
10n
1
μ
R3
R5
Vo°
Vo°
GND
Vcc+
Vcc+
+
_
+
_
GND
1/2
R1
1/2
R1
Vcc/2
1/2
R1
R2
R3
+
_
Vi
Vo
Rs1
-1
Vo°
1/2
RL
R
1
---------
----------–
andVi
R
2
(
)
Vo
+
R
3
)
,
G
Vi
)
------------------------------
1
----------------------------------
2
----------
2
3
------
+
+
1
2
R
3
------
–
=
=
GL
Vi
)
------------------------------------
1
2
--
1
----------------------------------
1
2
----------
2
3
------
+
+
1
2
R
3
------
–
( )
,
=
=
Vo
ViG
(
)
RoIout
(
)
–
=
2
( )
,
Vo
Vi
1
----------------------------------------------
----------
2
------
+
+
1
------
–
---------------------
3
1
2
R
3
------
–
( )
,
–
=
Ro
1
2
R
3
------
–
----------------
4
( )
,
=
相關(guān)PDF資料
PDF描述
TS612IDD DUAL OP-AMP, 10000 uV OFFSET-MAX, 130 MHz BAND WIDTH, PDSO20
TS821ILT 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.225 V, PDSO3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TS612IDT 功能描述:運算放大器 - 運放 Dual Wideband 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
TS613 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
TS613_02 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
TS613D 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
TS613ID 功能描述:運算放大器 - 運放 Dual Wideband 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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