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National Semiconductor - Dual High-Speed/ Low-Power Line Driver

Numéro de référence CLC418
Description Dual High-Speed/ Low-Power Line Driver
Fabricant National Semiconductor 
Logo National Semiconductor 





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CLC418 fiche technique
N
Comlinear CLC418
Dual High-Speed, Low-Power Line Driver
August 1996
General Description
The Comlinear CLC418 dual high-speed current-feedback
operational amplifier is designed to drive low-impedance and
high capacitance loads while maintaining high signal fidelity.
Operating on ±5V power supplies, each of the CLC418’s
amplifiers produces a continuous 96mA output current. Into a
back-terminated 50load, the devices produce -85/-64dBc
second/third harmonic distortion (Av = +2, Vo = 2Vpp, f = 1MHz).
The CLC418’s current-feedback architecture maintains consistent
performance over a wide range of gain and signal levels. DC gain
and bandwidth can be set independently. With proper resistor
selection, either maximally flat gain response or linear phase
response can be selected.
Requiring a mere 15mW quiescent power per amplifier, the
CLC418 offers superior performance-vs-power with a 130MHz
small-signal bandwidth, 350V/ms slew rate and quick 4.6ns
rise/fall times (2Vstep). The combination of low quiescent power,
high output current drive and high performance make the
CLC418 a great choice for many battery-powered personal
communication/computing systems.
Combining the CLC418’s two amplifiers (shown below) results in
a powerful differential line driver for driving video signals over
unshielded twisted-pair (UTP). The CLC418 can also be used for
driving differential-input step-up transformers for applications
such as Asynchronous Digital Subscriber Lines (ADSL) or High-
Bit-Rate Digital Subscriber Lines (HDSL).
The CLC418’s amplifiers make excellent low-power high-
resolution A-to-D converter drivers with their very fast 15ns set-
tling time (to 0.2%) and ultra-low -85/-75dBc harmonic distortion
(Av = +2, Vo = 2Vpp, f = 1MHz, RL = 1k).
Typical Application Diagram
Differential Line Driver
with Load Impedance Conversion
Features
s 130MHz bandwidth (Av = +2)
s 96mA output current
s 1.5mA supply current
s -85/-75dBc HD2/HD3
s 15ns settling to 0.2%
s -74dBc input-referred crosstalk (5MHz)
s Single version available (CLC408)
Applications
s ADSL/HDSL driver
s Coaxial cable driver
s UTP differential line driver
s Transformer/coil driver
s High capacitive-load driver
s Video line driver
s Portable/battery-powered line driver
s Differential A/D driver
Non-Inverting Frequency Response
(Av = +2V/V, RL = 100)
1M 10M 100M
Frequency (Hz)
418 Freq. Resp. Plot
Pinout
DIP & SOIC
Rg2
Vin
Rt1
Vd/2
+
1/2
CLC418
-
Rf1
Rg1 Rt2
Rf2
-
1/2
CLC418
+
-Vd/2
Rm/2
Req
Rm/2
I:n
Zo
UTP
Io
RL
+
Vo
-
Vo1
Vinv1
Vnon-inv1
VEE
VCC
Vo2
Vinv2
Vnon-inv2
418 Typ App Diag
418 Pinout
© 1996 National Semiconductor Corporation
Printed in the U.S.A.
http://www.national.com

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