Overview
The UAF42AU, produced by Texas Instruments, is a universal active filter that offers versatility in configuring various types of filters, including low-pass, high-pass, band-pass, and band-reject filters. This component utilizes a classic state-variable analog architecture, incorporating an inverting amplifier and two integrators. The integrators feature on-chip 1000pF capacitors trimmed to 0.5%, addressing the challenge of obtaining tight tolerance, low-loss capacitors in active filter design. The UAF42AU is available in both 14-pin plastic DIP and SOIC-16 surface-mount packages, with an operating temperature range of –25°C to +85°C.
Key Specifications
| Parameter | Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Power Supply Voltage | ±6 | ±18 | V | ||
| Input Voltage | ±VS ±0.7 | V | |||
| Operating Temperature | –25 | +85 | °C | ||
| Storage Temperature | –40 | +125 | °C | ||
| Junction Temperature | +125 | °C | |||
| Frequency Range, fn | 0 | 100 kHz | kHz | ||
| Maximum Q | 400 | ||||
| Maximum (Q • Frequency) Product | 500 kHz | kHz | |||
| Offset Voltage, Low-Pass Output | ±5 | mV | |||
| Resistor Accuracy | 0.5% | 1% | % | ||
| Gain-Bandwidth Product | G = +1 | 4 MHz | MHz | ||
| Total Harmonic Distortion | G = +1, f = 1kHz | 0.1% | % | ||
| Voltage Output | RL = 2kΩ | ±11 | ±11.5 | V | |
| Short Circuit Current | ±25 | mA |
Key Features
- Versatile Filter Configurations: Can be configured for low-pass, high-pass, band-pass, and band-reject filters.
- Simple Design Procedure: A DOS-compatible filter design program simplifies the implementation of various filter types, including Butterworth, Bessel, and Chebyshev.
- Accurate Frequency and Q: Includes on-chip 1000pF capacitors trimmed to 0.5% for accurate frequency and Q settings.
- Time-Continuous Filter: Free from anomalies and switching noise associated with switched-capacitor filter types.
- Additional Op Amp: A fourth, uncommitted FET-input op amp can be used for additional stages or special filters like band-reject and Inverse Chebyshev.
- Improved Performance: Enhanced slew rate of 10V/ms and extended useful natural frequency up to 100kHz compared to the UAF41.
Applications
- Test Equipment: Suitable for various test equipment applications due to its versatile filter configurations.
- Communications Equipment: Used in communications equipment for precise filtering needs.
- Medical Instrumentation: Applied in medical instrumentation for accurate signal processing.
- Data Acquisition Systems: Utilized in data acquisition systems to filter and process data accurately).
- Monolithic Replacement for UAF41: Offers improvements over the UAF41, making it a suitable replacement in many applications).
Q & A
- What types of filters can the UAF42AU be configured for?
The UAF42AU can be configured for low-pass, high-pass, band-pass, and band-reject filters).
- What is the operating temperature range of the UAF42AU?
The operating temperature range is –25°C to +85°C).
- What is the maximum Q value for the UAF42AU?
The maximum Q value is 400).
- What is the maximum (Q • Frequency) product for the UAF42AU?
The maximum (Q • Frequency) product is 500 kHz).
- What type of capacitors are included on-chip in the UAF42AU?
The UAF42AU includes on-chip 1000pF capacitors trimmed to 0.5%).
- Is there a design program available for the UAF42AU?
Yes, a DOS-compatible filter design program is available to simplify the implementation of various filter types).
- What are the package options for the UAF42AU?
The UAF42AU is available in 14-pin plastic DIP and SOIC-16 surface-mount packages).
- What is the gain-bandwidth product of the UAF42AU?
The gain-bandwidth product is 4 MHz for a gain of +1).
- What is the total harmonic distortion of the UAF42AU?
The total harmonic distortion is 0.1% at a gain of +1 and a frequency of 1 kHz).
- Can the UAF42AU be used in medical instrumentation?
Yes, the UAF42AU is suitable for use in medical instrumentation due to its precise filtering capabilities).
