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參數(shù)資料
| 型號： | TS635ID |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 運動控制電子 |
| 英文描述： | DUAL WIDE BAND OPERATIONAL AMPLIFIER FOR ADSL LINE INTERFACE |
| 中文描述： | 雙寬帶運放的ADSL線路接口 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 126K |
| 代理商： | TS635ID |
TS635
6/10
THE TS635 AS LINE DRIVER ON ADSL LINE
INTERFACE. SINGLE SUPPLY
IMPLEMENTATION WITH PASSIVE OR ACTIVE
IMPEDANCE MATCHING.
THE LINE INTERFACE - ADSL Remote
Terminal (RT):
The Figure1 shows a typical analog line interface
used for ADSL service. On this note, the accent
will be made on the emission path. The TS635 is
used as a dual line driver for the upstream signal.
Figure 1 :
Typical ADSL Line Interface
For the remote terminal it is required to create an
ADSL modem easy to plug in a PC. In such an ap-
plication, the driver should be implemented with a
+12 volts single power supply. This +12V supply is
available on PCI connector of purchase.
The Figure 2 shows a single +12V supply circuit
that uses the TS635 as a remote terminal trans-
mitter in differential mode.
Figure 2 :
TS635 as a differential line driver with
a +12V single supply
The driver is biased with a mid supply (nominaly
+6V), in order to maintain the DC component of
the signal at +6V. This allows the maximum dy-
namic range between 0 and +12 V. Several op-
tions are possible to provide this bias supply (such
as a virtual ground using an operational amplifier),
such as a two-resistance divider which is the
cheapest solution. A high resistance value is re-
quired to limit the current consumption. On the
other hand, the current must be high enough to
bias the inverting input of the TS635. If we consid-
er this bias current (5
μ
A) as the 1% of the current
through the resistance divider (500
μ
A) to keep a
stable mid supply, two 47k
resistances can be
used.
The input provides two high pass filters with a
break frequency of about 1.6kHz which is neces-
sary to remove the DC component of the input sig-
nal. To avoid DC current flowing in the primary of
the transformer, an output capacitor is used. The
this case the load impedance is 25
for each driv-
er.
For the ADSL upstream path necessary to avoid
any distortion. In this simple non-inverting amplifi-
cation configuration, it will be easy to implement a
Sallen-Key lowpass filter by using the TS635. For
ADSL over POTS, a maximum 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 Figure 3 for a differential line.
Figure 3 :
TS635 as a differential line driver with
an active impedance matching
impedance
matching
twisted-pair
telephone
line
HYBRID
CIRCUIT
LP filter
TS635
Line Driver
reception
(analog)
emission
(analog)
high output
current
upstream
downstream
ST70135
ST70134
TS636
Receiver
VGA
ASCOT ADSL
Chip-Set
1/2
R1
R3
R2
Vi
Vi
Vo
Vo
GND
+12V
25
100
1:2
Hybrid
&
Transformer
GND
+12V
47k
47k
10μ
100n
100n
100n
1k
1k
12.5
12.5
10n
1μ
+12V
+
_
+
_
GND
1/2
R1
Vcc/2
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TS635IDW | DUAL WIDE BAND OPERATIONAL AMPLIFIER FOR ADSL LINE INTERFACE |
| TS636 | ESD BAG, METAL-IN, W/ZIPPER, 10" X14" |
| TS636IDT | DIFFERENTIAL AMPLIFIER|DUAL|BIPOLAR|SOP|14PIN|PLASTIC |
| TS636D | DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACE |
| TS636I | High temp ESD masking tape. 1" x 3" x 60 YARD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS635IDT | 制造商:STMicroelectronics 功能描述: |
| TS635IDW | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DUAL WIDE BAND OPERATIONAL AMPLIFIER FOR ADSL LINE INTERFACE |
| TS635IDWT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| TS636 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACE |
| TS636D | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACE |
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