Anadigm has introduced AnadigmFilter1, the first in a family of chipsets using its dynamically programmable dpASP and a state machine. This dynamically programmable ASP incorporates a universal analog filter architecture that provides the designer with frequency options from DC to 600 kHz, using a 6th order filter. Low pass, band pass, high pass or band stop circuits can be quickly implemented, without the usual digital-to-analog conversions or writing DSP or microprocessor programming code. The designer selects from the comprehensive library of pre-sets available within AnadigmFilter1. The on-board filters can be selected to emulate Butterworth, Bessel, Chebyshev and inverse Chebyshev filter approximations.

AnadigmFilter1 solves design challenges for low and ultra-low frequency filter requirements in applications such as monitoring the movement and stresses of buildings, bridges and rail tracks; strain gauges; and piezo sensors or other inputs receiving vibration sensor data. It's also effective with ultrasonic, acoustic or other low-frequency signals that require filtering. These applications include hearing aids, audio synthesizers, sonar systems, fish finders, RF receivers, satellite receivers, set top boxes and global positioning systems (GPS). Numerous telephone, communication and industrial control system applications can also benefit from the simplicity and accuracy and flexibility of this programmable analog filter. The chipset input consists of a choice of one or two fixed input stages (which can be summed), each of which can be configured using external resistors and capacitors to provide gain or attenuation, level shifting, single-ended-to-differential conversion and 1st-order low-pass and high-pass filtering. Gain and stop-band frequency can be dynamically controlled in real time without interruption to the signal, allowing filter gain and frequency to be swept across one full octave of the frequency spectrum.

Large changes in filter frequency are realized by adjusting the internal clock dividers, or external reference clock frequency changes to the clock. Summing stage input connections and filter circuit architecture or approximation can also be realized in real time when these parameters are changed, although there will be a momentary break in the circuit connections and step response settling time. Filter gain and corner frequency settings are typically better than 1% accurate; these settings are very stable over the entire industrial temperature range - with almost no temperature drift. Chipset power consumption is typically 200milliwatts. Low-current standby mode/sleep mode is also available. Samples and production quantities of the new

AnadigmFilter1 AN236K04 chipset, which consists of the AN231E04 dpASP and AN236C04 State Machine, are available now from distributor Nu Horizons (www.nuhorizons.com) and Anadigm, at a suggested resale price for U.S. delivery in 1000-piece quantities at US$11.28 each. In addition, the AN236K04-EVAL2 AnadigmFilter1 evaluation board, which includes the AN236K04 chipset, is available at a suggested resale price of US$199.00.