XD13700 Dual Operational Transconductance Amplifiers with Linearizing Diodes and Buffers

Product Overview

The XINLUDA XD13700 is a dual operational transconductance amplifier (OTA) with linearizing diodes and output buffers, designed for analog signal processing tasks such as voltage-controlled amplifiers, filters, and oscillators. It is functionally equivalent to Texas Instruments’ LM13700N, with matching performance parameters and the added benefit of competitive sourcing and cost structure.

Functional Architecture Comparison

Both XD13700 and LM13700N include two independent OTAs with differential inputs and a bias-current-controlled transconductance output. Integrated linearizing diodes reduce distortion, and each OTA features an output buffer to simplify external circuit design.

Advantage: XD13700 maintains complete functional parity with LM13700N, ensuring full drop-in compatibility and design reusability across analog systems.

Electrical Performance Parameters

Key parameters for both devices are closely matched:

• Transconductance (gm): Up to 2000 µS typical at high bias current

• Input Offset Voltage: Typically ±2 mV

• Output Impedance: High, enabling flexible load interfacing

• Low THD and wide bandwidth due to internal diode linearization

The XD13700 offers consistent and accurate performance in analog modulation, voltage-controlled filtering, and AGC applications.

Advantage: Equivalent signal precision and distortion performance to the LM13700N, supporting high-fidelity analog signal processing.

Enhanced Buffer Characteristics

Both products offer Darlington-pair output buffers for improved drive capability. In XD13700, the buffer design provides excellent linearity, low input current, and sufficient current drive for capacitive and resistive loads, similar to the LM13700N.

Advantage: Reliable buffering performance for a wide range of analog output applications, ensuring stable system behavior.

Packaging and Pin Compatibility

The XD13700 is offered in the standard 16-pin Dual In-line Package (DIP) and SOIC-16, maintaining full pin-to-pin compatibility with the LM13700N. This allows for direct substitution in existing PCB designs without requiring any layout or firmware changes.

Advantage: Seamless integration into existing systems as a cost-effective replacement.

Temperature Range and Operational Robustness

Both the XD13700 and LM13700N are rated for operation over the –40°C to +85°C industrial temperature range, suitable for demanding environments. XINLUDA ensures consistent batch performance through strict process control and post-production testing.

Advantage: High reliability and electrical stability under industrial and extended-temperature conditions.

Cost, Availability, and Supply Assurance

The XD13700 offers a strong edge in cost-effectiveness and supply reliability. As the LM13700N is subject to occasional long lead times due to supply constraints, the XD13700 provides a dependable and scalable alternative with stable lead times and attractive pricing.

Advantage: Improved procurement flexibility and lower total cost of ownership, which is critical for volume production environments.

Conclusion

The XINLUDA XD13700 is a high-performance, fully compatible alternative to the LM13700N, offering the following advantages:

• Functional and pin-level compatibility

• Equivalent OTA performance with low distortion and wide bandwidth

• Integrated buffers and linearizing diodes for simplified analog design

• Reliable operation across industrial temperature ranges

• Shorter lead times and more favorable pricing

As a result, the XD13700 is an ideal replacement solution for applications in analog signal control, synthesizers, audio systems, and industrial analog computing.