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D828H8EX-6 Datasheet(PDF) 2 Page - Frequency Devices, Inc. |
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D828H8EX-6 Datasheet(HTML) 2 Page - Frequency Devices, Inc. |
2 / 18 page 8-Bit Programmable Filters D828 Series Digital Tuning & Control Characteristics 1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176 e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com 2 Digital Tuning Characteristics The digital tuning interface circuits are a parallel set of eight (8) 4053 CMOS switches which accept CMOS compatible inputs for the eight tuning bits (D0 - D7). Filter tuning follows the tuning equation given below: fc = ( fmax/256 ) [ 1 + D7 x 2 7 + D6 x 2 6 + D5 x 2 5 + D4 x 2 4 + D3 x 2 3 + D2 x 2 2 + D1 x 2 1 + D0 x 2 0 ] where D1 - D7 = "0" or "1", and fmax = Maximum tuning frequency; fc = corner frequency; Minimum tunable frequency = fmax/256 (D0 thru D7 = 0); Minimum frequency step (Resolution) = fmax/256 Data Input Specifications Input Data Levels (CMOS Logic) Input Voltage (Vs = 15 Vdc) Low Level In 0 Vdc min. 4 Vdc max. High Level In 11 Vdc min. 15 Vdc max. Input Current High Level In - 10 -5 µA typ. -1 µA max.. Low Level In +10 -5 µA typ. +1 µA max. Input Capacitance 5 pF typ 7.5 pF max. Input Data Format Frequency Select Bits Positive Logic Logic "1" = +Vs Logic "0" = Gnd Bit Weighting (Binary-Coded) D0 LSB (least significant bit) D7 MSB (most significant bit) Frequency Range 256 : 1, Binary Weighted Pin-Out Key IN Analog Input Signal D7 Tuning Bit 7 (MSB) OUT Analog Output Signal D6 Tuning Bit 6 GND Power and Signal Return D5 Tuning Bit 5 +Vs Supply Voltage, Positive D4 Tuning Bit 4 -Vs Supply Voltage, Negative D3 Tuning Bit 3 Os Offset Adjustment D2 Tuning Bit 2 D1 Tuning Bit 1 D0 Tuning Bit 0 (LSB) MSB --- --- --- --- --- --- LSB Bit Weight 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 fc Corner Frequency D7 D6 D5 D4 D3 D2 D1 D0 00000000 fmax/256 00000001 fmax/128 00000011 fmax/64 00000111 fmax/32 00001111 fmax/16 00011111 fmax/8 00111111 fmax/4 01111111 fmax/2 11111111 fmax +Vs OUT -Vs D D D D GND D D D D -IN 2.00 Os 4 5 3 2 1 0 6 7 4 +IN |
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