Product Detail
AAF-3 _________2
to 8 Channel
Anti-Alias Low-Pass Filter Card
Now available with DASYLab drivers!
Features
- Compatible with A/D converter boards from top manufacturers
- 2, 4, 6, or 8 programmable anti-alias low-pass filter and/or differential amplifier channels per card for front-end signal conditioning
- Unlimited number of channels per system
- Software-programmable gains of 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 500, and 1000
- 8-pole elliptic or linear phase filters
- Optional Bessel, Butterworth, Cauer, and high-speed linear phase filters
- Software-selectable cutoff frequencies from 1 Hz to 100 kHz
- Optional cutoff frequencies up to 200 kHz
- Cutoff frequency also may be set by external clock for tracking filter applications
- Use up to 4 different cutoff frequencies on each board
- 110µVRMS total wideband noise (elliptic mode)
- 0.05dB passband ripple (elliptic mode)
- Software-programmable synchronization of the internal filter-clock to the A/D sampling rate
- Shipped with programs and libraries for Windows 3.1/95/NT, LabVIEW, HP VEE and DASYLab
Overview
The AAF-3 is a 2- to 8-channel anti-alias low-pass filter and instrumentation amplifier card series for front-end signal conditioning in PC-based data acquisition systems. It provides a choice of standard 8-pole elliptic and linear phase filter characteristics, as well as optional Bessel, Butterworth, Cauer, and high-speed linear phase characteristics to meet specific application requirements.
Each channel on the AAF-3 can have its own instrumentation amplifier with differential inputs. You can independently program each channel for a gain of 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 500 or 1000 for an input range of 5 mV to 10V.
The cutoff frequency of the filters can be set with an external clock or programmed for a range of frequencies from below 1 Hz to 100 kHz and optionally up to 200 kHz. Each 2-channel pair can operate with a different cutoff frequency, allowing for up to 4 different cutoff frequencies on each AAF-3.
New High-Pass and Band-Pass Filter Options
A band-pass and high-pass option is now available for the AAF-3. The bandpass is accomplished by using high-pass filter sections with the existing low-pass filter sections on the AAF-3 main board. The filter sections offer a maximum bandwidth of 200:1. For example, a filter with a lower cutoff frequency of 1Hz can have a minimum upper cutoff of 200kHz.
Butterworth, Bessel, and Cauer elliptic characteristics provide adjustable center frequencies from 1Hz lower cutoff to 50kHz upper cutoff.
Support Software
Alligator Technologies has developed both menu-driven and driver-level software for controlling the functions on the AAF-3.
Menu-Driven Software - The AAF-3 is supplied with WSETAAF3 for Windows 3.1/95/NT and the menu-driven SETAAF3 for DOS, both of which control the Gain, Filter Type, Clock Source, and Actual Cutoff Frequency.
SETAAF3 uses a single setup screen which contains pop-up menus for selecting these parameters. For example, Gain can be specified for each channel that it is available, while the Clock Source and Filter Type can be specified for each filter board two-channel pair. The setup screen also includes the Board Address, which address specifies the memory location used by the computer to communicate with the board, and the Clock Source A and Clock Source B values, which help determine the Actual Cutoff Frequency.
Once selected, a combination of settings can be saved as an AAF-3 description file (ADF). Once saved, the settings stored in this file can be easily applied to other boards by selecting and loading the file.
Function Libraries- If you prefer to develop your own programs, the AAF-3 comes with DOS and Windows linkable libraries that provide more than 10 functions for configuring and controlling the AAF-3. The set_ group of subroutines modifies the Board Configuration Structure values, which are then used by the program_ group of subroutines to create and send the data control words required by the AAF-3.
Example application programs are provided for popular compilers, including Visual C++, Visual Basic, Borland C++, and Borland Pascal.
LabVIEW Driver - AAF3.LLB VI can be graphically assembled with other VIs in a LabVIEW block diagram to create a complete instrumentation system.
HP VEE User-Object - Both 16- and 32-bit user-objects for HP VEE.
DASYLab Driver - Provides radio buttons for selecting the filter type, clock source and gain setting.
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