Explore LM13700 pins, signal names, electrical functions and connection guidance for each package.
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Sets channel A transconductance through an externally supplied current.
For the example, connect a 150 kΩ resistor from circuit GND to this pin.
The pin sits approximately two diode drops above V−; do not drive it directly from a voltage source. Absolute maximum is 2 mA.
Feeds the two input-linearizing diodes.
Leave open in the small-signal example. Use a properly limited bias current when enabling the diodes.
The diode current and input attenuation must be designed together; 2 mA is an absolute maximum.
A positive differential input produces positive output current.
Apply a 1 kHz sine wave, ±2 mV peak, centered on circuit GND.
The OTA responds to IN+ minus IN−.
Connect to circuit GND in this example.
Keep the differential signal small when the linearizing diodes are unused.
High-impedance output supplies a current proportional to differential voltage.
Connect a 10 kΩ load to GND and a high-impedance scope.
This is a current output, not an ordinary low-impedance voltage-amplifier output.
Negative supply for both OTAs and buffers.
Connect to −15 V and bypass to circuit GND with 100 nF.
Independent input to the Darlington output buffer.
Ground in this unbuffered example.
It is not internally connected to OUT A pin 5.
Emitter-follower output with a two-junction level shift.
Leave open in this example. When used, provide a bias load toward V−.
Output current and package dissipation must stay within limits; the buffer is not rail-to-rail.
Independent Darlington follower output.
Leave open in this example.
Independent input to the second buffer.
Connect to circuit GND in this example.
It is not internally connected to OUT B pin 12.
Positive supply shared by both channels.
Connect to +15 V and bypass to circuit GND with 100 nF.
Second high-impedance OTA output.
Leave open in this channel-A example.
Negative differential input of the second OTA.
Connect to circuit GND when channel B is unused here.
Positive differential input of the second OTA.
Connect to circuit GND when channel B is unused here.
Bias connection for channel B linearizing diodes.
Leave open in this example.
Sets the second channel transconductance independently.
Leave open so IABC B is zero in this example.
An unused bias pin does not require a direct connection to GND.
BETA