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R858L8EY-2 Datasheet(PDF) 2 Page - Frequency Devices, Inc. |
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R858L8EY-2 Datasheet(HTML) 2 Page - Frequency Devices, Inc. |
2 / 19 page Range Switch 8-Bit Programmable Filters R858 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 two 4042 quad CMOS latches which accept the following CMOS-compatible inputs: eight tuning bits (D0 - D7), arrange selection bit (R), a latch strobe bit (C), and a transition polarity bit (P). 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 Data Control Lines Functions Latch Strobe (C) Transition Polarity (P) Data Control Modes Mode 1 P = 0; C = 0 frequency follows input codes P = 0; C = 0 › frequency latched on rising edge Mode 2 P = 1; C = 1 frequency follows input codes P = 1; C = 1 fl frequency latched on falling edge 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 mA typ. -1 mA max.. Low Level In +10 -5 mA typ. +1 mA max. Input Capacitance 5 pF typ 7.5 pF max. Latch Response Data Set Up Time1 25 nS Data Hold Time2 50 nS Strobe Pulse Width 80 nS min. 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 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 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 “P” Transition Polarity Bit D4 Tuning Bit 4 “C” Tuning Strobe Bit D3 Tuning Bit 3 +Vs Supply Voltage, Positive D2 Tuning Bit 2 -Vs Supply Voltage, Negative D1 Tuning Bit 1 Os Offset Adjustment D0 Tuning Bit 0 (LSB) R Range Switch Adjustment Notes: 1. Frequency data must be present before occurrence of strobe edge. 2. Frequency data must be present after occurrence of strobe edge. 2.00 OUT -Vs +Vs R IN Os4 C P Bottom View D7 D6 D5 D4 GND D3 D2 D1 D0 |
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