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ADBMS2950BCCSZ 数据表(PDF) 7 Page - Analog Devices |
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ADBMS2950BCCSZ 数据表(HTML) 7 Page - Analog Devices |
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7 / 97 page  Data Sheet ADBMS2950B Rev. 0 | Page 7 of 97 VOLTAGE REFERENCE SPECIFICATIONS Operating junction temperature (TJ) = −40°C to +125°C, VDD = 12V, VREG = 5.0V, ISOMD pin is connected low, unless otherwise noted. Table 7. VREF1, VREF2, and VREF1P25 Specifications Parameter Min Typ Max Unit Test Conditions/Comments VREF1P25 Nominal Voltage 1.2 1.25 1.3 V VREF1P25 Pin, load ±3 mA Temperature Coefficient 10 ppm/°C VREF1P25 Pin, no load Thermal Hysteresis 100 ppm VREF1P25 Pin, no load Long-Term Drift 60 ppm/√khr VREF1P25 Pin, no load Load Regulation −1 mA < ILOAD < 1 mA −5 +5 mV −3 mA < ILOAD < 3 mA −15 +15 mV VREF1 Nominal Voltage1 3.05 3.2 3.3 V VREF1 Pin, no load Temperature Coefficient 3 ppm/°C VREF1 Pin, no load Thermal Hysteresis 20 ppm VREF1 Pin, no load Long-Term Drift 20 ppm/√khr VREF1 Pin, no load VREF2 Nominal Voltage2 2.975 3 3.03 V VREF2 Pin, no load Temperature Coefficient 10 ppm/°C VREF2 Pin, no load Long-Term Drift3 ±0.2 % VREF2 Pin, no load Temperature and Long-Term Drift4 ±0.3 % VDIV VREF1 : VDIV Ratio 27 : 1 1 The VREF1 voltage is very stable across operating conditions, but its nominal value may vary between different ICs. The VREF1 nominal voltage specification shows the guaranteed minimum and maximum values over different ICs. The variation in VREF1 nominal voltage does not affect the LSB size of the ADCs that use VREF1 as their reference. For a single IC, all further variation of VREF1 (such as due to drift over temperature, reflow soldering, lifetime, and thermal hysteresis) is included in the TME and gain error specifications of the ADCs. The VREF1 specifications are for informational purposes only and do not need to be considered in the system design process. 2 The VREF2 voltage is stable across operating conditions, but its nominal value may vary between different ICs. The VREF2 nominal voltage specification shows the guaranteed minimum and maximum values over different ICs. The OCxADCs use VREF2 as their reference, but the nominal voltage variation of VREF2 does not affect the OCxADC LSB size. For a single IC, all further variation of VREF2 (such as due to drift over temperature, reflow soldering, lifetime, and thermal hysteresis) is included in the TME and gain error specifications of the OCxADCs. 3 The VREF2 long-term drift includes variation of VREF2 due to, for example, reflow soldering, lifetime, and thermal hysteresis. 4 This specification covers all variation in VREF2 over temperature and lifetime. |
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