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L2340QC20 Datasheet(PDF) 3 Page - LOGIC Devices Incorporated |
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L2340QC20 Datasheet(HTML) 3 Page - LOGIC Devices Incorporated |
3 / 11 page DEVICES INCORPORATED Special Arithmetic Functions 3 L2340 Digital Synthesizer 08/16/2000–LDS.2340-E FIGURE 1A.INPUT FORMATS 14 13 12 2 1 0 2 14 213 212 2 2 2 1 2 0 31 30 29 2 1 0 *±2 0 2–1 2–2 2 –29 2–30 2–31 AM PH *±2 0 denotes two's complement sign or highest magnitude bit. Since phase angles are modulo 2π and phase accumulator is modulo 2 32, this bit may be regarded as ±π. Fract. Unsigned Mag./Two's Comp. Integer Unsigned Magnitude (RTP = 0) FM, PM — Frequency Modulation, Phase Modulation Control FM and PM is the 2-bit Frequency Modulation/Phase Modulation Control that determines one of the four modes shown in Table 2. When full-scale is exceeded, the accumulator will roll over correctly allowing continuous phase accumulation through 2 π radians. OBIQ — Data Input/Output Format Select When OBIQ is HIGH, offset binary format is selected. When OBIQ is LOW, unsigned format is selected. OEI — x-coordinate Data Output Enable When OEI is LOW, I15-0 is enabled for data output. When OEI is HIGH, I15-0 is placed in a high-impedance state. FIGURE 1B.OUTPUT FORMATS 14 13 12 2 1 0 2 14 213 212 2 2 2 1 2 0 14 13 12 2 1 0 2 14 213 212 2 2 2 1 2 0 Integer Unsigned Magnitude (OBIQ = 0) 15 14 13 2 1 0 NS 2 14 213 2 2 2 1 2 0 15 14 13 2 1 0 NS 2 14 213 2 2 2 1 2 0 Offset Binary (OBIQ = 1) IQ NS denotes negative sign. (i.e. '1' negates the number) OEQ — y-coordinate Data Output Enable When OEQ is LOW, Q15-0 is enabled for data output. When OEQ is HIGH, Q15-0 is placed in a high-impedance state. |
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