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ADM9240ARU Datasheet(PDF) 9 Page - Analog Devices |
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ADM9240ARU Datasheet(HTML) 9 Page - Analog Devices |
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9 / 22 page  ADM9240 –9– REV. 0 Table I. A/D Output Code vs. VIN Input Voltage A/D Output +12 VIN +5 VIN +3.3 VIN +2.5 VIN +VCCP1 +VCCP2 Decimal Binary <0.062 <0.026 <0.0172 <0.013 <0.014 <0.014 0 00000000 0.062–0.125 0.026–0.052 0.017–0.034 0.013–0.026 0.014–0.028 0.014–0.028 1 00000001 0.125–0.187 0.052–0.078 0.034–0.052 0.026–0.039 0.028–0.042 0.028–0.042 2 00000010 0.188–0.250 0.078–0.104 0.052–0.069 0.039–0.052 0.042–0.056 0.042–0.056 3 00000011 0.250–0.313 0.104–0.130 0.069–0.086 0.052–0.065 0.056–0.070 0.056–0.070 4 00000100 0.313–0.375 0.130–0.156 0.086–0.103 0.065–0.078 0.070–0.084 0.070–0.084 5 00000101 0.375–0.438 0.156–0.182 0.103–0.120 0.078–0.091 0.084–0.098 0.084–0.098 6 00000110 0.438–0.500 0.182–0.208 0.120–0.138 0.091–0.104 0.098–0.112 0.098–0.112 7 00000111 0.500–0.563 0.208–0.234 0.138–0.155 0.104–0.117 0.112–0.126 0.112–0.126 8 00001000 l l l 4.000–4.063 1.666–1.692 1.100–1.117 0.833–0.846 0.900–0.914 0.900–0.914 64 (1/4 Scale) 01000000 l l l 8.000–8.063 3.330–3.560 2.200–2.217 1.667–1.680 1.800–1.814 1.800–1.814 128 (1/2 Scale) 10000000 l l l 12.000–12.063 5.000–5.026 3.300–3.317 2.500–2.513 2.700–2.714 2.700–2.714 192 (3/4 Scale) 11000000 l l l 15.313–15.375 6.380–6.406 4.210–4.230 3.190–3.203 3.445–3.459 3.445–3.459 245 11110101 15.375–15.438 6.406–6.432 4.230–4.245 3.203–3.216 3.459–3.473 3.459–3.473 246 11110110 15.438–15.500 6.432–6.458 4.245–4.263 3.216–3.229 3.473–3.487 3.473–3.487 247 11110111 15.500–15.563 6.458–6.484 4.263–4.280 3.229–3.242 3.487–3.501 3.487–3.501 248 11111000 15.563–15.625 6.484–6.510 4.280–4.300 3.242–3.255 3.501–3.515 3.501–3.515 249 11111001 15.625–15.688 6.510–6.536 4.300–4.314 3.255–3.268 3.515–3.529 3.515–3.529 250 11111010 15.688–15.750 6.536–6.562 4.314–4.331 3.268–3.281 3.529–3.543 3.529–3.543 251 11111011 15.750–15.813 6.562–6.588 4.331–4.348 3.281–3.294 3.543–3.558 3.543–3.558 252 11111100 15.813–15.875 6.588–6.615 4.348–4.366 3.294–3.307 3.558–3.572 3.558–3.572 253 11111101 15.875–15.938 6.615–6.640 4.366–4.383 3.307–3.320 3.572–3.586 3.572–3.586 254 11111110 >15.938 >6.640 >4.383 >3.320 >3.586 >3.586 255 11111111 The input ranges of the analog inputs are shown in more detail in Table I. The +VCCP1 and +VCCP2 inputs are used to measure processor core voltages, and have an input range from 0 V to 3.6 V. If only a single processor core voltage is being monitored, the VCCP2 input may be used to monitor the –12 V supply. This is achieved by using a resistive divider network referenced to a known positive dc voltage. This is illustrated in Figure 4. INPUT CIRCUITS The internal structure for the analog inputs is shown in Figure 3. Each input circuit consists of an input protection diode, an attenuator, plus a capacitor to form a first order low-pass filter which gives the input immunity to high frequency noise. MUX +VCCP2 97.3k 50pF 42.7k +5V 22.7k 35pF 122.2k 55.2k 25pF 91.6k 80.9k 25pF 61.1k 111.2k 25pF 36.7k 97.3k 50pF 42.7k +12V +3.3V +2.5V +VCCP1 Figure 3. Internal Structure of Analog Inputs |
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