Overview
The UAF42, produced by Texas Instruments, is a versatile universal active filter that can be configured for a wide range of filter types, including low-pass, high-pass, band-pass, and band-reject filters. It utilizes a classic state-variable analog architecture with an inverting amplifier and two integrators, each containing on-chip 1000pF capacitors trimmed to 0.5% accuracy. This design ensures tight tolerance and low-loss capacitors, addressing a significant challenge in active filter design. The UAF42 is available in 14-pin plastic DIP and SOIC-16 surface-mount packages, operating within a 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 | ||
| Frequency Range, fn | 0 | 100 kHz | kHz | ||
| Frequency Accuracy | f = 1kHz | 1% | % | ||
| Maximum Q | 400 | ||||
| Maximum (Q • Frequency) Product | 500 kHz | kHz | |||
| Slew Rate | 10 | V/ms | |||
| Gain-Bandwidth Product | G = +1 | 4 | MHz | ||
| Total Harmonic Distortion | G = +1, f = 1kHz | 0.1% | % |
Key Features
- Versatile Filter Configurations: The UAF42 can be configured for low-pass, high-pass, band-pass, and band-reject filters using a classic state-variable analog architecture.
- Accurate Frequency and Q: Includes on-chip 1000pF capacitors trimmed to 0.5% accuracy, ensuring tight tolerance and low-loss capacitors.
- Simple Design Procedure: A DOS-compatible filter design program and a computer-aided design program are available to facilitate the implementation of various filter types.
- Additional Op Amp: A fourth, uncommitted FET-input op amp can be used to form additional stages or for special filters such as band-reject and Inverse Chebyshev.
- Improved Performance: The UAF42 has an increased slew rate of 10V/ms and an improved frequency • Q product compared to the UAF41.
- Monolithic Construction: Provides lower cost and improved reliability compared to discrete implementations.
Applications
- Test Equipment: Suitable for various test equipment applications due to its versatile filter configurations.
- Communications Equipment: Used in communications equipment for signal processing and filtering.
- Medical Instrumentation: Applied in medical instrumentation for precise signal filtering and processing.
- Data Acquisition Systems: Utilized in data acquisition systems to filter and process data accurately.
- Monolithic Replacement for UAF41: The UAF42 is a monolithic replacement for the UAF41, offering several improvements.
Q & A
- What types of filters can the UAF42 be configured for?
The UAF42 can be configured for low-pass, high-pass, band-pass, and band-reject filters.
- What is the accuracy of the on-chip capacitors in the UAF42?
The on-chip 1000pF capacitors are trimmed to 0.5% accuracy.
- What is the operating temperature range of the UAF42?
The UAF42 operates within a temperature range of –25°C to +85°C.
- What is the maximum slew rate of the UAF42?
The maximum slew rate of the UAF42 is 10V/ms.
- What is the gain-bandwidth product of the UAF42?
The gain-bandwidth product of the UAF42 is 4 MHz.
- Can the UAF42 be used in medical instrumentation?
Yes, the UAF42 is suitable for use in medical instrumentation due to its precise signal filtering capabilities.
- What types of packages are available for the UAF42?
The UAF42 is available in 14-pin plastic DIP and SOIC-16 surface-mount packages.
- Is there a design program available for the UAF42?
Yes, a DOS-compatible filter design program and a computer-aided design program are available to facilitate the implementation of various filter types.
- What is the maximum Q value of the UAF42?
The maximum Q value of the UAF42 is 400.
- What is the total harmonic distortion of the UAF42 at 1 kHz?
The total harmonic distortion of the UAF42 at 1 kHz is 0.1%.
