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AD7111LN Datasheet(PDF) 5 Page - Analog Devices |
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AD7111LN Datasheet(HTML) 5 Page - Analog Devices |
5 / 8 page AD7111/AD7111A REV. 0 –5– PIN CONFIGURATIONS Write Cycle Timing Diagram CIRCUIT DESCRIPTION GENERAL CIRCUIT DESCRIPTION The AD7111/AD7111A consists of a 17-bit R-2R CMOS mul- tiplying D/A converter with extensive digital logic. The logic translates the 8-bit binary input into a 17-bit word which is used to drive the D/A converter. Input data on the D7-D0 bus is loaded into the input data latches using CS and WR control signals. When using the AD7111, the rising edge of WR latches the input data and initiates the internal data transfer to the de- coder. A minimum time tRFSH, the refresh time, is required for the data to propagate through the decoder before a new data write is attempted. In contrast, the AD7111A WR input is level triggered to allow transparent operation of the latches if required. The transfer function for the circuit of Figure 1 is given by: VO = –VIN 10 exp – 0. 375 N 20 or VO VIN dB = –0.375 N where 0.375 is the step size (resolution) in dB and N is the in- put code in decimal for values 0 to 239. For 240 ≤ N ≤ 255 the output is zero. Table I gives the output attenuation relative to 0 dB for all possible input codes. Figure 1. Typical Circuit Configuration The graphs on the last page give a pictorial representation of the specified accuracy and monotonic ranges for all grades of the AD7111/AD7111A. High attenuation levels are specified with less accuracy than low attenuation levels. The range of mono- tonic behavior depends upon the attenuation step size used. DIP/SOIC LCCC Table I. Ideal Attenuation in dB vs. Input Code D7-D4 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0000 0.0 0.375 0.75 1.125 1.5 1.875 2.25 2.625 3.0 3.375 3.75 4.125 4.5 4.875 5.25 5.625 0001 6.0 6.375 6.75 7.125 7.5 7.875 8.25 8.625 9.0 9.375 9.75 10.125 10.5 10.875 11.25 11.625 0010 12.0 12.375 12.75 13.125 13.5 13.875 14.25 14.625 15.0 15.375 15.75 16.125 16.5 16.875 17.25 17.625 0011 18.0 18.375 18.75 19.125 19.5 19.875 20.25 20.625 21.0 21.375 21.75 22.125 22.5 22.875 23.25 23.625 0100 24.0 24.375 24.75 25.125 25.5 25.875 26.25 26.625 27.0 27.375 27.75 28.125 28.5 28.875 29.25 29.625 0101 30.0 30.375 30.75 31.125 31.5 31.875 32.25 32.625 33.0 33.375 33.75 34.125 34.5 34.875 35.25 35.625 0110 36.0 36.375 36.75 37.125 37.5 37.875 38.25 38.625 39.0 39.375 39.75 40.125 40.5 40.875 41.25 41.625 0111 42.0 42.375 42.75 43.125 43.5 43.875 44.25 44.625 45.0 45.375 45.75 46.125 46.5 46.875 47.25 47.625 1000 48.0 48.375 48.75 49.125 49.5 49.875 50.25 50.625 51.0 51.375 51.75 52.125 52.5 52.875 53.25 53.625 1001 54.0 54.375 54.75 55.125 55.5 55.875 56.25 56.625 57.0 57.375 57.75 58.125 58.5 58.875 59.25 59.625 1010 60.0 60.375 60.75 61.125 61.5 61.875 62.25 62.625 63.0 63.375 63.75 64.125 64.5 64.875 65.25 65.625 1011 66.0 66.375 66.75 67.125 67.5 67.875 68.25 68.625 69.0 69.375 69.75 70.125 70.5 70.875 71.25 71.625 1100 72.0 72.375 72.75 73.125 73.5 73.875 74.25 74.625 75.0 75.375 75.75 76.125 76.5 76.875 77.25 77.625 1101 78.0 78.375 78.75 79.125 79.5 79.875 80.25 80.625 81.0 81.375 81.75 82.125 82.5 82.875 83.25 83.625 1110 84.0 84.375 84.75 85.125 85.5 85.875 86.25 86.625 87.0 87.375 87.75 88.125 88.5 88.875 89.25 89.625 1111 MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE MUTE D3-D0 |
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