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ZN448 Datasheet(PDF) 13 Page - List of Unclassifed Manufacturers |
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ZN448 Datasheet(HTML) 13 Page - List of Unclassifed Manufacturers |
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13 / 18 page  ZN448/9 13 UNIPOLAR OPERATION The general connection for unipolar operation is shown in Fig.16. The values of R 1 and R2 are chosen so that VIN = VREF IN when the analog input (A IN) is at full-scale. The resulting full-scale range is given by: A INFS = 1 + , V REF IN = G.VREF IN. To match the ladder resistance R 1/R2 (RIN) = 4k. The required nominal values of R 1 and R2 are given by R1 = 4Gk, R 2 = 4G k G-1 Fig.16 General unipolar input connections R1 R2 680k 1M ZERO ADJUST GROUND 7 9 6 ZN448/9 VIN AIN VREF IN Using these relationships a table of nominal values of R 1 and R 2 can be constructed for VREF IN = 2.5V. Gain adjustment Due to tolerance in R 1 and R2, tolerance in VREF and the gain (full-scale) error of the DAC, some adjustment should be incorporated into R 1 to calibrate the full-scale of the converter. When used with the internal reference and 2% resistors a preset capable of adjusting R 1 by at least ±5% of its nominal value is suggested. R 2 8k 5.33k R 1 8k 16k G 2 4 Input range +5V +10V Zero adjustment Due to offsets in the DAC and comparator the zero (0 to 1) code transition would occur with typically 15mV applied to the comparator input, which correpsonds to 1.5LSB with a 2.56V reference. Zero adjustment must therefore be provided to set the zero transition to its correct value of +0.5LSB or 5mV with a 2.56V reference. This is achieved by applying an adjustable positive offset to the comparator input via P2 and R3. The values shown are suitable for all input ranges greater than 1.5 times V REF IN. Practical circuit values for +5 and +10V input ranges are given in Fig.17, which incorporates both zero and gain adjustments. R 1 R 2 |
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