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TMC2330A Datasheet(PDF) 10 Page - Fairchild Semiconductor |
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TMC2330A Datasheet(HTML) 10 Page - Fairchild Semiconductor |
10 / 18 page PRODUCT SPECIFICATION TMC2330A 10 REV. 1.1.8 10/31/00 Timing Diagrams No Accumulation Note: OERX = OEPY = LOW Phase Modulation Notes: 1. OERX = OEPY = LOW 2. Carrier C and amplitude R loaded on CLK0. 3. Modulation Values I, J, K, L… Loaded on CLK1, CLK2, etc. 4. Output corresponding to modulation loaded at CLKi emerged tDO after CLKi + 21. 5. To modulate amplitude, vary XRIN with ENXR = 1. CLK 00 0123 … … … … … … 22 f(A) f(B) 23 tH tD tHO tS tPWH tPWL RTP, TCXY ACC[1:0] ENXR, ENYP[1:0] XRIN[15:0], YPIN[31:0] RXOUT[15:0], PYOUT[15:0] 00 00 EN EN EN A BC CLK 00 01 01 01 01 0123 … 22 23 24 25 … … … … … RTP, TCXY ACC[1:0] ENXR ENYP[1:0] XRIN[15:0] YPIN[31:0] RXOUT[15:0] PYOUT[15:0] R 10 01 01 01 01 C I J K L C + I 2C + J 3C + K 4C + L Applications Discussion Numeric Overflow Because the TMC2330A accommodates 16-bit unsigned radii and 16-bit signed Cartesian coordinates, Polar-To- Rectangular conversions can overflow for incoming radii greater than 32767= 7FFFh and will overflow for all incom- ing radii greater than 46341=B505h. (ln signed magnitude mode, a radius of 46340 = B504h will also overflow at all angles.) The regions of overflow and of correct conversion are illustrated in Figure 1. In signed magnitude mode, overflows are circularly symmet- rical—if a given radius overflows at an angle P, it will also overflow at the angles π-P, π+P, and -P. This is because -X will overflow if and only if X overflows, and -Y will over- flow if and only if Y overflows. In two’s complement mode, the number system’s asymmetry complicates the overflow conditions slightly. An input vector with an X component of -32768=8000h will not overflow, whereas one with an X component of +32768 will. Table 3 summarizes several simple cases of overflow and near-over- flow. |
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