Product Detail
GSAF-10
Analog Anti-Alias Low-Pass Filter
Precision Analog Anti-Alias Low-Pass Filter Board for Front-End Signal Conditioning With 16-Bit and 18-Bit A/D Converters in Data Acquisition Systems
Features
- One independent anti-alias low-pass filter channel with differential input
- 96 dB (typ) common-mode rejection
- Gain 1.0 ± .001dB
- Adjustable DC offset trim to 1.0 mV
- Perfectly suited for 16-bit A/Ds - lowest offset and gain errors equate to less than ±2 LSB
- Extremely low THD
- 9-pole low-pass Butterworth and Bessel filter transfer functions, Chebychev optional
- Standard corner frequencies: 100 Hz, 200Hz, 500Hz, 1kHz, 2kHz, 5kHz, 10kHz, 20kHz and 50kHz
- Custom corner frequencies to customer specification also available
- Input and output protection
- Offset guaranteed to less than ±300 microV
- Offset drift ±15 microV typical
- Adjustable DC offset trim to 0.0V ±15microV
- Adjustable gain trim to 0.0dB
Overview
The GSAF-10 Gold Series are analog low-pass filter boards that offer the performance required to maintain the maximum accuracy of high-precision 16- and 18-bit A/D converters. Lowest offset and gain errors equate to less than ±2 LSB over time and temperature, guaranteeing full dynamic range of conversion (no missing bits).
Each board provides one differential-input channel with a common-mode rejection ratio of 96dB (typ) for maximum rejection of signal interference. Total harmonic distortion with a 1 kHz 20 vpp input signal is a very low .002%.
The GSAF-10 Gold Series are factory-set to a standard -3 dB corner frequency of 1.0 kHz, 2.0 kHz, 5.0 kHz, 10.0 kHz, 20.0 kHz, or 50 kHz. Custom-built filters with user-specified fixed corner frequencies tuned by the factory or tunable low-pass filters with adjustable cutoff frequency ranges are optionally available.
The GSAF-10 are available with differential-input 9-pole low-pass Butterworth and Bessel filter transfer functions with 54 dB/octave roll-offs; Chebychev characteristics are optionally available. The Butterworth model provides the maximally flat passband response and sharp cut-offs required in such applications as anti-aliasing and noise reduction. The Bessel model provides the linear phase characteristics, uniform group delay, and monotonic roll-off required for such applications as closed-loop systems and signal reconstruction.
The filter functions are located on removable screw terminal plugs that allow you to switch functions without unterminating the interconnecting wires and sensors.
A feedback topology at the output stage provides for a 10 mW output impedance, making the GSAF-10 capable of driving any A/D converter input stage without further buffering. Input impedance is 20kOhms ±2%.
Pre-installed offset trimming and output-gain scaling potentiometers permit nulling of offset and gain for expansion of dynamic range for maximum resolution. Both adjustments are incorporated at the last stage of the filter to compensate for all filter component variations and are accessible at the board's edge.
Connection to Your Data Acquisition System
The GSAF-10 can be mounted anywhere on the lab bench with stand offs. For multi-channel systems, the GSAF-10 can be plugged into a standard 19" rackmount system. They also can used in a VME chassis with other VME/VXI-based boards.
The GSAF-10 requires a ±15V power supply, which is obtained from a built-in power connector for stand-alone operation or from the included motherboard connector for rackmount applications.
Filter Characteristics Response type 9-pole low-pass, Butterworth or Bessel (Chebyshev optional) Cutoff frequency tolerance ±2% Corner frequencies* 100 Hz, 200 Hz, 500Hz, 1.0 kHz, 2.0 kHz, 5.0 kHz, 10.0 kHz, 20.0 kHz, and 50 kHz Total harmonic distortion 20vpp; 1 kHz </= .002%, 10 kHz </= .008% Analog Input Voltage range ±10V Differential gain 1 ± .001dB Common-mode rejection (@ 1kHz) 92 dB min, 96 dB typ Common-mode voltage range ±40V Impedance 15 kOhms ±2% Maximum safe voltage ±40V Analog Output Impedance 5 mOhms typ, 10 mOhms max Linear operating range ±10V @ ±2mA Offset voltage ±300 µV Noise (5 Hz to 50 kHz) 25 µVrms typ, 30 µVrms max Load Capacitance 100pF max Environmental Operating temperature 0°C to 50°C Storage temperature -20°C to +70°C Relative humidity (non-condensing) 0% to 95% @ 60°C
* Custom frequencies are available.
|
|
||
| LAPLACE INSTRUMENTS
LTD 3B, Middlebrook Way, Holt Road, Cromer, Norfolk, NR27 9JR, UK |
Tel: + 44 (0)1263 515160 Fax: + 44 (0)1263 512532 E-mail:tech@laplace.co.uk |
|
|
|
||
