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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)： | 7/10頁 |
| 文件大小： | 131K |
| 代理商： | TS612IDDT |
TS612
7/10
ADSL CONCEPT
Asymmetric Digital Subscriber Line (ADSL), is a
new modem technology, which converts the exist-
ing twisted-pair telephone lines into access paths
for multimedia and high speed data communica-
tions.
ADSL transmits more than 8 Mbps to a subscriber,
and can reach 1Mbps from the subscriber to the
central office. ADSL can literally transform the ac-
tual public information network by bringing mov-
ies, television, video catalogs, remote CD-ROMs,
LANs, and the Internet into homes.
An ADSL modem is connected to a twisted-pair
telephone line, creating three information chan-
nels: a high speed downstream channel (up to
1.1MHz) depending on the implementation of the
ADSL architecture, a medium speed upstream
channel (up to 130kHz) and a POTS (Plain Old
Telephone Service), split off from the modem by
filters.
THE LINE INTERFACE - ADSL Remote
Terminal (RT):
The Figure1 shows a typical analog line interface
used for ADSL. The upstream and downstream
signals are separated from the telephone line by
using an hybrid circuit and a line transformer. On
this note, the accent will be made on the emission
path.
Figure 1 :
Typical ADSL Line Interface
The TS612 is used as a dual line driver for the up-
stream signal.
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 TS612 as a remote terminal trans-
mitter in differential mode.
Figure 2 :
TS612 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 TS612. 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 1
μ
F capacitance provides a path for low fre-
quencies, the 10nF capacitance provides a path
for high end of the spectrum.
In differential mode the TS612 is able to deliver a
typical amplitude signal of 18V peak to peak.
The dynamic line impedance is 100
. The typical
value of the amplitude signal required on the line
is up to 12.4V peak to peak. By using a 1:2 trans-
former ratio the reflected impedance back to the
primary will be a quarter (25
) and therefore the
amplitude of the signal required with this imped-
ance will be the half (6.2 V peak to peak). Assum-
ing the 25
series resistance (12.5
for both out-
puts) necessary for impedance matching, the out-
put signal amplitude required is 12.4 V peak to
peak. This value is acceptable for the TS612. In
this case the load impedance is 25
for each driv-
er.
impedance
matching
twisted-pair
telephone
line
HYBRID
CIRCUIT
digital
treatment
LP filter
TS612ID
Line Driver
reception
(analog)
emission
(analog)
digital to
analog
analog to
digital
high output
current
reception
circuits
upstream
downstream
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
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PDF描述 |
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| TS612IDD | DUAL OP-AMP, 10000 uV OFFSET-MAX, 130 MHz BAND WIDTH, PDSO20 |
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| TSC80251A1-A12IBD | 8-BIT, 12 MHz, MICROCONTROLLER, PQCC44 |
| TSC87251A1-B12CB | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQCC44 |
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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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