LM13700/LM13700A Dual Operational Transconductance Amplifiers with Linearizing Diodes and
Buffers
May 1998
LM13700/LM13700A
Dual Operational Transconductance Amplifiers with
Linearizing Diodes and Buffers
General Description
The LM13700 series consists of two current controlled
transconductance amplifiers, each with differential inputs
and a push-pull output. The two amplifiers share common
supplies but otherwise operate independently. Linearizing di-
odes are provided at the inputs to reduce distortion and allow
higher input levels. The result is a 10 dB signal-to-noise im-
provement referenced to 0.5 percent THD. High impedance
buffers are provided which are especially designed to
complement the dynamic range of the amplifiers. The output
buffers of the LM13700 differ from those of the LM13600 in
that their input bias currents (and hence their output DC lev-
els) are independent of I
ABC
. This may result in performance
superior to that of the LM13600 in audio applications.
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Excellent g
m
linearity
Excellent matching between amplifiers
Linearizing diodes
High impedance buffers
High output signal-to-noise ratio
Applications
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Current-controlled amplifiers
Current-controlled impedances
Current-controlled filters
Current-controlled oscillators
Multiplexers
Timers
Sample-and-hold circuits
Features
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g
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adjustable over 6 decades
Connection Diagram
Dual-In-Line and Small Outline Packages
DS007981-2
Top View
Order Number LM13700M, LM13700N or LM13700AN
See NS Package Number M16A or N16A
© 1999 National Semiconductor Corporation
DS007981
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
