BETALM13700Dual operational transconductance amplifier
Control an analog gain with a small bias current.
LM13700 contains two operational transconductance amplifiers, or OTAs. Each turns a small differential input voltage into an output current, with its conversion factor set by an external amplifier-bias current. An external load converts that current into a voltage. Input-linearizing diodes support wider signal ranges when correctly biased, and separate Darlington buffers can drive a following stage. These buffers need external connections and bias loads. This reference uses a ±15 V, low-amplitude bench circuit to make the gain-control principle visible. SOIC-16 is listed in the current ordering appendix; PDIP-16 is retained as the documented legacy LM13700N package. Both share the same 16-pin function map.
