1 Features

1• gm Adjustable Over 6 Decades

• Excellent g m Linearity

• Excellent Matching Between Amplifiers

• Linearizing Diodes for reduced output distortion

• High Impedance Buffers

• High Output Signal-to-Noise Ratio

2 Applications

• Current-Controlled Amplifiers

• Stereo Audio Amplifiers

• Current-Controlled Impedances

• Current-Controlled Filters

• Current-Controlled Oscillators

• Multiplexers

• Timers

• Sample-and-Hold Circuits

3 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 diodes are

provided at the inputs to reduce distortion and allow higher input levels. The result is a 10-dB signal-to-

noise improvement 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 thus their output DC

levels) are independent of IABC. This may result in

performance superior to that of the LM13600 in audio

applications.