Overview
The LM13700N/NOPB, produced by Texas Instruments, is a dual operational transconductance amplifier with linearizing diodes and output buffers. This device features two independent channels, each with differential inputs and a push-pull output. The linearizing diodes at the inputs reduce distortion, allowing for higher input levels and a 10-dB improvement in signal-to-noise ratio referenced to 0.5 percent THD. The high impedance buffers are designed to complement the dynamic range of the amplifiers, making them particularly suitable for audio applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Single Supply) | 9.5 | - | 32 | V |
| Supply Voltage (Dual Supply) | -16 | - | 16 | V |
| Operating Temperature | 0 | - | 70 | °C |
| Differential Input Voltage | -5 | - | 5 | V |
| Input Offset Voltage (VOS) | 0.4 | 4 | 5 | mV |
| Forward Transconductance (gm) | 5400 | 6700 | 9600 | μS |
| Buffer Output Current | - | - | 20 | mA |
| Power Dissipation (TA = 25°C) | - | - | 570 | mW |
| Storage Temperature | -65 | - | 150 | °C |
Key Features
- gm Adjustable Over 6 Decades: The transconductance can be adjusted over a wide range, making it versatile for various applications.
- Excellent gm Linearity: The device features excellent linearity of the transconductance, which is crucial for maintaining signal integrity.
- Linearizing Diodes: These diodes reduce output distortion and allow for higher input levels.
- High Impedance Buffers: The buffers are designed to drive loads efficiently and maintain signal quality.
- High Output Signal-to-Noise Ratio: The device offers a high signal-to-noise ratio, enhancing overall performance in noise-sensitive applications.
Applications
- Current-Controlled Amplifiers: Suitable for applications where the gain needs to be controlled by an external current.
- Stereo Audio Amplifiers: The LM13700 is particularly useful in audio applications due to its high signal-to-noise ratio and low distortion.
- Current-Controlled Filters and Oscillators: Can be used in filter and oscillator circuits where the frequency or filter characteristics need to be controlled by an external current.
- Multiplexers and Timers: Useful in multiplexing and timing applications where precise control over signal levels is required.
- Sample-and-Hold Circuits: Can be employed in sample-and-hold circuits due to its high impedance buffers and adjustable transconductance.
Q & A
- What is the LM13700N/NOPB?
The LM13700N/NOPB is a dual operational transconductance amplifier with linearizing diodes and output buffers produced by Texas Instruments.
- What are the key features of the LM13700N/NOPB?
Key features include gm adjustable over 6 decades, excellent gm linearity, linearizing diodes, high impedance buffers, and a high output signal-to-noise ratio.
- What are the typical applications of the LM13700N/NOPB?
Typical applications include current-controlled amplifiers, stereo audio amplifiers, current-controlled filters and oscillators, multiplexers, timers, and sample-and-hold circuits.
- What is the operating temperature range of the LM13700N/NOPB?
The operating temperature range is from 0°C to 70°C.
- What is the maximum buffer output current of the LM13700N/NOPB?
The maximum buffer output current is 20 mA.
- How does the LM13700N/NOPB reduce output distortion?
The device uses linearizing diodes at the inputs to reduce output distortion and allow for higher input levels.
- What is the significance of the high impedance buffers in the LM13700N/NOPB?
The high impedance buffers are designed to drive loads efficiently and maintain signal quality, especially in audio applications.
- Can the LM13700N/NOPB be used in single-ended or dual supply systems?
Yes, the LM13700N/NOPB can be used in both single-ended and dual supply systems with minimal changes.
- What is the recommended diode bias current (ID) for optimal performance?
A value of 1 mA is recommended for ID unless the specific application demands otherwise.
- How does the LM13700N/NOPB optimize signal-to-noise ratio?
The signal-to-noise ratio can be optimized by adjusting the magnitude of the input signal and ensuring the amplifier bias current (IABC) is as large as possible.
