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零件编号 | TS612ID | ||
描述 | DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT | ||
制造商 | STMicroelectronics | ||
LOGO | |||
1 Page
TS612
DUAL WIDE BAND OPERATIONAL AMPLIFIER
WITH HIGH OUTPUT CURRENT
s LOW NOISE : 3nV/√Hz, 1.2pA/√Hz
s HIGH OUTPUT CURRENT : 200mA
s VERY LOW HARMONIC AND INTERMODU-
LATION DISTORTION
s HIGH SLEW RATE : 40V/µs
s SPECIFIED FOR 25Ω LOAD
DESCRIPTION
The TS612 is a dual operational amplifier featur-
ing a high output current (200mA min.), large
gain-bandwidth product (130MHz) and capable of
driving a 25Ω load with a 160mA output current at
±6V power supply.
This device is particularly intended for applications
where multiple carriers must be amplified simulta-
neously with very low intermodulation products.
The TS612 is housed in SO20 batwing plastic
package for a very low thermal resistance.
The TS612 is fitted out with Power Down function
in order to decrease the consumption.
APPLICATION
s UPSTREAM line driver for Assymetric Digital
Subscriber Line (ADSL) (NT).
ORDER CODE
Part Number Temperature Range
TS612ID
-40, +85°C
Package
D
•
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
D
SO-20 Batwing
(Plastic Micropackage)
PIN CONNECTIONS (top view)
Power Down 1 1
Inverting input 1 2
Non-inverting input 1 3
Vcc - 4
Vcc - 5
Vcc - 6
Vcc - 7
Non-Inverting input 2 8
Inverting input 2 9
Power Down 2 10
_
+
+
_
Top view
20 Vcc+ 1
19 Output 1
18 Vcc-
17 Vcc -
16 Vcc -
15 Vcc -
14 Vcc -
13 GND
12 Output 2
11 Vcc+ 2
May 2000
1/11
TYPICAL APPLICATION : TS612 AS DRIVER
FOR ADSL LINE INTERFACES
A SINGLE SUPPLY IMPLEMENTATION WITH PASSIVE
OR ACTIVE IMPEDANCE MATCHING
by C. PRUGNE
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
high output
current
digital to emission LP filter
analog (analog)
digital
treatment
analog to
digital
reception
(analog)
upstream
TS612
Line Driver
reception
circuits
impedance
matching
HYBRID
CIRCUIT
twisted-pair
telephone
line
downstream
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
100n
+12V
1k
Vi
47k
3 + 20 +12V
2 _ 19
R2
R1
1µ
12.5 10n
Vo
25Ω
Vi 10µ 47k 100n
1k
GND
100n
R3 Vo
9+
11
+12V
12.5
8 _ 12
GND
4,5,6,7,14,15,16,17,18
1:2
Hybrid
& 100Ω
Transformer
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 (5µA) as the 1% of the current
through the resistance divider (500µA) to keep a
stable mid supply, two 47kΩ 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
8/11
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页数 | 11 页 | ||
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零件编号 | 描述 | 制造商 |
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