PDF L2330QC25 Data sheet ( Hoja de datos )

Número de pieza	L2330QC25
Descripción	Coordinate Transformer
Fabricantes	LOGIC Devices Incorporated
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No Preview Available ! DEVICES INCORPORATED DEVICES INCORPORATED L2330 L2330Coordinate Transformer Coordinate Transformer FEATURES u Rectangular-to-Polar or Polar-to- Rectangular at 50 MHz u Performs Direct Digital Synthesis (DDS) functions along with PM and FM Modulation u 24-Bit Polar Phase Angle Accuracy u Replaces Fairchild TMC2330A u 120-pin PQFP DESCRIPTION The L2330 is a coordinate transformer that converts bidirectionally between Rectangular and Polar coordinates. seen at the output after 22 clock cycles and will continue upon every clock cycle thereafter. When in Rectangular-to-Polar mode, the L2330 is able to retrieve phase and magnitude information or backward map from a rectangular raster display to a radial data set. When in Polar-to-Rectangular mode, the L2330 is able to execute direct digital waveform synthesis and modulation. Real-time image-space conversions are achieved from radi- ally-generated images, such as RADAR, SONAR, and ultrasound to raster display formats. Functional Description The L2330 converts bidirectionally between Rectangular (Cartesian) and Polar (Phase and Magnitude) coordi- nates. The user selects the numeric format. A valid transformed result is When in Rectangular-to-Polar mode, the user inputs a 16-bit Rectangular coordinate and the output generates a Polar transformation with 16-bit magnitude and 16-bit phase. The user may select the data format to be either two’s complement or sign-and- magnitude Cartesian data format. Polar Magnitude data is always in magnitude format only. Polar Phase Angle data is modulo 2π so it may be regarded as either unsigned or two’s complement format. When in Polar-to-Rectangular mode, the user inputs 16-bit Polar Magnitude and 32-bit Phase data and the output generates a 16-bit Rectangular coordi- nate. The use may select the data format to be either two’s complement or sign-and-magnitude Cartesian data format. L2330 BLOCK DIAGRAM ENXR XRIN15-0 ENYP1-0 YPIN31-0 16 2 32 2 ACC1-0 TCXY RTP POLAR RECTANGULAR OERX 16 RXOUT15-0 OEPY 16 PYOUT15-0 OVF CLK Special Arithmetic Functions 1 09/27/2001–LDS.2330-E 1 page DEVICES INCORPORATED L2330 Coordinate Transformer Conversion Ranges The L2330 supports 16-bit unsigned radii and 16-bit signed Cartesian coordinates. Since the 16-bit rectangular coordinate space does not completely cover the polar space defined by 16-bit radii, certain values of “r” will not map correctly. This condition is indicated by the overflow (OVF) flag. complement number system is not symmetric about zero. For example, if the X or Y component of the input is –32768 (8000H), no overflow occurs. But if the X or Y component of the input is +32768, overflow does occur. FIGURE 2. CONVERSION RANGES When converting from Rectangular-to- Polar, if both inputs are zero the radius is zero but the angle is not defined. The L2330 will output 4707H in this case. Since the angle is not defined for a zero length vector, this is not an error. In Polar-to-Rectangular conversions, no overflow occurs for r ≤ 32767 (7FFFH). Overflow will always occur when r > 46341 (B505H). Note that in signed magnitude mode r = 46340 (B504H) will also cause an overflow. For 32767 ≤ r ≤ 46340, overflow may occur depend- ing on the exact values of r and θ. Figure 2 shows, for the first quadrant, these three regions: A = no overflow (correct conversion), B = possible overflow, C = overflow. The other quadrants are mapped in a similar manner. π/2 65535 32767 C B When in signed magnitude mode, the overflows on the other three quadrants are the same as in the first. This occurs because the signed magnitude number system is symmetric about zero. For example, if a given r and angle θ cause an overflow, the same r will cause an overflow for the angles -θ, π+θ , π-θ. However, when in two’s complement mode, the overflows aren’t quite the same. This occurs because the two’s A yr θ x 32767 65535 Special Arithmetic Functions 5 09/27/2001–LDS.2330-E 5 Page DEVICES INCORPORATED SWITCHING WAVEFORMS: NO ACCUMULATION CLK RTP TCXY ACC1-0 ENXR ENYP1-0 XRIN15-0 YPIN31-0 RXOUT15-0 PYOUT15-0 01 tH tS 00 EN A 2 00 EN B 3 00 EN C L2330 Coordinate Transformer 22 23 24 tPWL tPWH tCYC tD f(A) f(B) SWITCHING WAVEFORMS: PHASE MODULATION 0123 CLK RTP, TCXY ACC1-0 00 01 01 01 ENXR XRIN15-0 R ENYP1-0 10 01 01 01 YPIN31-0 C I J K RXOUT15-0 PYOUT15-0 4 01 01 L 22 23 24 25 C+I 2C + J 3C + K 4C + L Special Arithmetic Functions 11 09/27/2001–LDS.2330-E 11 Page

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