TS635ID ,DUAL WIDE BAND OPERATIONAL AMPLIFIER FOR ADSL LINE INTERFACEapplicationswhere multiple carriers must be amplified simulta-neously with very low intermodulation ..
TS636 ,DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACETS636DIFFERENTIAL VARIABLE GAIN AMPLIFIERFOR ADSL LINE INTERFACE ■ LOW NOISE : 4.7nV/√Hz■ LOW ..
TS636I ,DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACEELECTRICAL CHARACTERISTICS. V = ±6Volts, T = 25°C (unless otherwise specified). CC ambSymbol P ..
TS636ID ,DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACEELECTRICAL CHARACTERISTICS. V = ±6Volts, T = 25°C (unless otherwise specified). CC ambSymbol P ..
TS636IDT ,DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACEABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit1)V14 VCC Supply voltage 2)V0 to 14 Vi Inpu ..
TS636IDT ,DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACEELECTRICAL CHARACTERISTICS. V = ±6Volts, T = 25°C (unless otherwise specified). CC ambSymbol P ..
UA741A ,GENERAL-PURPOSE SINGLE OP-AMPsapplications. the in..
ternal compensation network (6 dB/octave) insures
tabllity in closed loop
UA741C ,GENERAL PURPOSE SINGLE BIPOLAR OP-AMPSPIN CONFIGURATION AS THE UA709
DIP14
(Plastlc Package)
D
SOB
Dlpe (Plastic Micropackage)
(P ..
UA741CD ,General purpose operational amplifierSupport &Product Order Tools &TechnicalCommunityFolder Now Documents SoftwareuA741SLOS094G–NOVEMBER ..
UA741CDR ,General-Purpose Operational AmplifierBlock Diagram ........ 10• Added caption to Figure 11 in Device Functional Modes section....... 11• ..
UA741CDT ,GENERAL PURPOSE SINGLE BIPOLAR OP-AMPSUA741GENERAL PURPOSESINGLE OPERATIONAL AMPLIFIER ■ LARGE INPUT VOLTAGE RANGE ■ NO LATCH-UP■ HI ..
UA741CH ,GENERAL-PURPOSE SINGLE OP-AMPsPIN CONFIGURATION AS THE UA709
DIP14
(Plastlc Package)
D
SOB
Dlpe (Plastic Micropackage)
(P ..
TS635ID
DUAL WIDE BAND OPERATIONAL AMPLIFIER FOR ADSL LINE INTERFACE
� LOW NOISE : 3.2nV/√Hz, 1.5pA/√Hz HIGH OUTPUT CURRENT : 160mA min. VERY LOW HARMONIC AND INTERMODU-
LATION DISTORTION HIGH SLEW RATE : 40V/μs SPECIFIED FOR 25Ω LOAD
DESCRIPTIONThis device is particularly intended for applications
where multiple carriers must be amplified simulta-
neously with very low intermodulation products. It
has been mainly designed to fit with ADSL
chip-set such as ST70134 or ST70135.
The TS635 is a high output current dual operation-
al amplifier, with a large gain-bandwidth product
(130MHz) and capable of driving a 25Ω load at
12V power supply. The TS635 is fitted out with
Power Down function in order to decrease the
consumption.
The TS635 is housed in a SO8 plastic package
and a SO8 Exposed-Pad plastic package.
APPLICATION UPSTREAM line driver for Asymmetric Digital
Subscriber Line (ADSL) (NT).
ORDER CODE
D = Small Outline Package (SO) - also available in Tape & Reel (DT)DW = Small Outline Package in Exposed-Pad (SO) - also available inTape & Reel (DWT)
PIN CONNECTIONS (top view)
TS635DUAL WIDE BAND OPERATIONAL AMPLIFIER
FOR ADSL LINE INTERFACE
TS635
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
APPLICATION: ADSL LINE INTERFACE All voltages values, except differential voltage are with respect to network terminal. Differential voltages are non-inverting input terminal with respect to the inverting input terminal. The magnitude of input and output voltages must never exceed VCC +0.3V.
TS635ELECTRICAL CHARACTERISTICS. VCC = ±6V, Tamb = 25°C (unless otherwise specified).
TS635
INTERMODULATION DISTORTIONThe curves shown below are the measurements results of a single operator wired as an adder with a gain
of 15dB.
The operational amplifier is supplied by a symmetric ±6V and is loaded with 25Ω.
Two synthesizers (Rhode & Schwartz SME) generate two frequencies (tones) (70 & 80kHz ; 180 &
280kHz).
An HP3585 spectrum analyzer measures the spurious level at different frequencies.
The curves are traced for different output levels (the value in the X ax is the value of each tone).
The output levels of the two tones are the same.
The generators and spectrum analyzer are phase locked to enhance measurement precision.
3rd ORDER INTERMODULATIONGain=15dB, Vcc=±6V, RL=25Ω, 2 tones 70kHz/
80kHz
3rd ORDER INTERMODULATION
Gain=15dB, Vcc=±6V, RL=25Ω, 2 tones 180kHz/
280kHz
TS635Closed Loop Gain and Phase vs. FrequencyGain=+2, Vcc=±6V, RL=25Ω
Closed Loop Gain and Phase vs. FrequencyGain=+11, Vcc=±6V, RL=25Ω
Maximum Output Swing Vcc=±6V, RL=25Ω
Closed Loop Gain and Phase vs. Frequency Gain=+6, Vcc=±6V, RL=25Ω
Equivalent Input Voltage NoiseGain=+100, Vcc=±6V, no load
Channel Separation (Xtalk) vs. Frequency XTalk=20Log(V2/V1), Vcc=±6V, RL=25Ω
TS635
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.
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.
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 (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
this case the load impedance is 25Ω 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 MATCHINGWith 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 1 : Typical ADSL Line Interface
Figure 2 : TS635 as a differential line driver with a +12V single supply
Figure 3 : TS635 as a differential line driver with an active impedance matching
