DUAL PROGRAMMABLE FREQUENCY FILTER

Digitally Programmable Filters
AD Dual Function Series

Our AD-Dual filters require a minimum set up procedure with no clock and external components required. Two filter channels are available in the same package to save valuable PCB space and wiring. Stable DC shift between settings and wide cut off selections up to 1 MHz will greatly improve systems resolution and signal to noise ratio. TTL/CMOS digital inputs are compatible with most common microprocessors.
Features include:
  • DUAL FILTER FUNCTION
    Choice of two LOWPASS, or two HIGHPASS, or
    one HIGHPASS and one LOWPASS
  • INDEPENDENT OPERATION
    Frequency is programmed individually.
    Separate Input & Output pins.
  • 8 BITS, 10 BITS, & 12 BITS RESOLUTION
    Frequency range of 1 : 255, 1 : 1023, & 1 : 4095.
  • ANALOG ACTIVE FILTER
    RC active filter. Not switch-capacitor filter.
  • COMPLETELY ASSEMBLED
    Fully finished module. No external component required.
  • CMOS, TTL & µP COMPATIBLE
    Interface with 8 Bits (8085 & 6800),
    and 12 Bits (68000) microprocessor.
  • 4 STANDARD RESPONSES
    Butterworth, Bessel, Chebyshev, & Elliptic.
  • BANDPASS & BAND-REJECT CONFIGURATION
    Obtain BANPASS by connecting a HIGHPASS to a
    LOWPASS in series, or a BAND-REJECT by connecting
    a HIGHPASS and LOWPASS to a summer.
  • HIGH ATTENUATION, FAST ROLL-OFF
    Filter orders from 2nd order to 8th order.
  • STABLE OUTPUT
    Unity gain output.
    Amplification available. (Up to 1000 times).
  • IDEAL FUNCTION BLOCK
    High input impedance.
    Low output impedance.
  • COMPENSATED DC OFFSET
    Internal DC offset < 2 mV.
    External adjustable to 0.0.
  • BUILT-IN DECOUPLING
    Internal power supply decoupling.

    • Suggested Applications for AD & AD-Dual Models MC6800 Interface

    INTERFACE WITH 8 BIT PROGRAMMABLE FILTER

    MC6800 Interface

    8085A Interface
         
       

    PROGRAM FREQUENCY VIA PRINTER PORT

    Case Style & Outline Dimensions

     
    PIN ASSIGNMENTS
    Pin No. Model AD8D
    1 Digital Bit 2 (filter 1)
    2 Digital Bit 1 (filter 1)
    3 Digital Bit 0 (filter 1); (LSB)
    4 CS (filter 1)
    5 WR (filter 1)
    6 N/C  
    7 Filter Input1 (filter 1)
    8 N/C  
    9 V + (+15V)
    10 Filter Output2 (filter 2)
    11 DC Offset (filter 2)
    12 Ground
    13 Digital Bit 7 (filter 2); (MSB)
    14 Digital Bit 6 (filter 2)
    15 Digital Bit 5 (filter 2)
    16 Digital Bit 4 (filter 2)
    17 Digital Bit 3 (filter 2)
    18 Digital Bit 2 (filter 2)
    19 Digital Bit 1 (filter 2)
    20 Digital Bit 0 (filter 2); (LSB)
    21 CS (filter 2)
    22 WR (filter 2)
    23 N/C  
    24 N/C  
    25 Filter Input2 (filter 2)
    26 V - (-15V)
    27 DC Offset (filter 1)
    28 Filter Output1 (filter 1)
    29 Ground
    (all GND pins are connected)
    30 Digital Bit 7 (filter 1); (MSB)
    31 Digital Bit 6 (filter 1)
    32 Digital Bit 5 (filter 1)
    33 Digital Bit 4 (filter 1)
    34 Digital Bit 3 (filter 1)

    WRITE CYCLE TIMING DIAGRAM

     

    Specifications
    ELECTRICAL CHARACTERISTICS
    (Supply = ±15V., Load = 10 k‡, Temp. = 25°C)
    Supply Current 25 mA/4th order
    Input Impedance > 500 kohm
    Output Impedance < 1 ohm (@ DC)
    Cut-off Variation ± 2%
    Frequency Stability 0.01 % /°C
    Unity Gain Output 0.0 dB
    Max. Input Voltage ±12 V.
    Max. Output Voltage ±12 V.
    DC Offset < ±2mV
    MECHANICAL CHARACTERISTICS
    Dimension 3.25" x 1.07" x 0.4"
    Pin Diameter 0.025"
    Materials Glass Filled Thermoplastic Nylon

    OPTIONS
    Suffix Description
    L ­ Low power consumption (20mA)
    I ­ Industrial temp. range (-25° C to 85° C)
    M ­ Military temp. range (-55° C to 125° C)
    A1 ­ 10x amplification
     

     A2 ­

    		 100x amplification
     

     A3 ­

    		 1000x amplification

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    Avens, Inc.
    P.O. Box 518 Plumsteadville, PA 18949
    800-394-5407
    Tel: 215-766-8775 • Fax: 215-997-8706
    info@avens-filter.com • www.avens-filter.com