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ALD500PC Datasheet(PDF) 11 Page - Advanced Linear Devices |
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ALD500PC Datasheet(HTML) 11 Page - Advanced Linear Devices |
11 / 11 page ALD500AU/ALD500A/ALD500 Advanced Linear Devices 11 3. Pick VINMAX = ±2V For I BMAX = 20µA, applying equation (4), 4. Calculate, using equation (3) for CINT: Use CINT 0.47µF as the closest practical value. 5. Pick CREF and CAZ = 0.47 µF 6. Pick tDINT = 2 x tINT = 200 msec. 7. Calculate the value for VREF, from equation (10): VREF = 2 20x10-6 = 0.83 µF 2 20x10-6 = 0.5 µF CINT . VINTMAX . RINT tDINT MAX = 1.00V = 0.1666667 sec. 0.5 x 10-6 x 4 x 100 x 103 200 x 10-3 ~ Design Example 3: 1. Pick resolution of 18 bit. Total number of counts during tINT is 262,144. 2. Pick tINT = 16.66667 msec. x 10 cycles This t INT allows clock period of 0.5425 µsec. and still achieve 18 bits resolution. 3. Again, as shown from previous example, pick VINMAX = ±2V For I BMAX = 20 µA, RINT = = 100 K Ω 4. Next, we calculate CINT: C INT = (0.1666667) x (20 x 10-6)/4 In this case, use CINT = 1.0 µF to keep V INT < 4.0V 5. Pick CREF and CAZ = 1.0 µF 6. Select tDINT = 2 x tINT = 333.333 msec. 7. Calculate VREF as shown in the previous examples and VREF = 1.00V 4 245776 or 16.276 µV/count 16.276 x VINTMAX VINMAX = 8.138 µV/count 20 x 10-6 2 = 100 K Ω Design Example 4: Objective: 5 1/2 digit + sign +over-range measurement. 1. Pick tINT = 133.333 msec. for 60Hz noise rejection. (16.6667 msec. x 8 cycles) Frequency = 1.8432 MHz clock period = 0.5425 µsec. During Input Integrate Phase, For VINT = 4.0V, the basic resolution is For VINMAX = 2.00V, the input resolution is 2. Pick VIN range = ± 2V For IB = 20 µA, RINT = 3. Calculate CINT = (0.133333) x (20 x 10-6)/4 = 0.67 µF 4. Pick CREF = CAZ = 0.67 µF 5. Select tDINT = 2 x tINT = 266.667 msec. 6. Calculate VREF as shown in Design Example 1, substituting the appropriate values: CINT . VINTMAX . RINT tDINT MAX VREF = ~ = 1.005V RINT = = 100 K Ω CINT = (0.1) x (20 x 10-6/4) ~ ~ 133.333 x 10-3 0.5425 x 10-6 = (assume VINTMAX = 4V) (VINTMAX = 4.0V) total count = = 245776 |
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