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ST7LITE20F2 数据表(PDF) 146 Page - STMicroelectronics |
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ST7LITE20F2 数据表(HTML) 146 Page - STMicroelectronics |
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146 / 166 page  Electrical characteristics ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 146/166 Doc ID 8349 Rev 5 Figure 92. Amplifier noise vs voltage 13.11.1 Amplifier output offset variation The offset is quite sensitive to temperature variations. In order to ensure a good reliability in measurements, the offset must be recalibrated periodically i.e. during power on or whenever the device is reset depending on the customer application and during temperature variation. Table 87 gives the typical offset variation over temperature. Table 86. ADC characteristics(1) 1. Data based on characterization results over the whole temperature range, not tested in production. Symbol Parameter Conditions Min Typ Max Unit VDD(AMP) Amplifier operating voltage − 3.6 − 5.5 V VIN Amplifier input voltage(2) 2. Please refer to the application note AN1830 for details of TE% vs Vin. VDD=3.6V 0 − 350 mV VDD=5V 0 − 500 VOFFSET Amplifier output offset voltage(3) 3. Refer to the offset variation in temperature below. VDD=5V − 200 − mV VSTEP Step size for monotonicity(4) 4. Monotonicity guaranteed if VIN increases or decreases in steps of min. 5mV. VDD=3.6V 3.5 −− mV VDD=5V 4.89 −− Linearity Output voltage response − Linear Gain factor Amplified analog input gain(5) 5. For precise conversion results, it is recommended to calibrate the amplifier at the following two points: − offset at VINmin = 0V − gain at full scale (for example VIN=430mV). −− 8 −− Vmax Output linearity max voltage VINmax = 430mV, VDD=5V − 3.65 3.94 V Vmin Output linearity min voltage − 200 − mV Vin Vout (ADC input) Vmax Vmin 430mV 0V Noise (OPAMP input) Table 87. Typical offset variation over temperature Typical offset variation (LSB) Unit -45 -20 +25 +90 °C -12 -7 − +13 LSB |
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