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MLX90251LVAFAA-000BU Datasheet(PDF) 9 Page - Melexis Microelectronic Systems |
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MLX90251LVAFAA-000BU Datasheet(HTML) 9 Page - Melexis Microelectronic Systems |
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9 / 20 page  MLX90251 Programmable Linear Hall Effect Sensor 3901090251 Page 9 of 20 Data Sheet Rev 012 Oct/2012 10.1 Output Quiescent Voltage (VOQ) Two parameters, AGND and OFFSET, are used for adjustment of the VOQ. The AGND is a 10 bit parameter for coarse adjustment of VOQ. It has a resolution of approximately 0.014V and a range of -100%VDD to 200%VDD. The OFFSET is a 10 bit parameter with a resolution of approximately -0.005V. The OFFSET parameter is used for fine adjustment of the VOQ, while the AGND parameter is used to set the range. The large adjustable range allows the MLX90251 to be used in an unipolar magnetic system without limiting the output voltage span. The formula below shows how the AGND and OFFSET parameters combine to set the VOQ. V V OQ DD OFFSET V AGND V V V 00 . 5 1023 0 . 5 1023 25 . 14 75 . 0 = ∗ − + ∗ + − = This formula approximates the typical VOQ of the MLX90251. The actual VOQ formula varies slightly from chip to chip. Melexis calibrates the AGND setting during final test so that the VOQ is approximately 50%VDD with OFFSET set to 512. This gives the VOQ a range of 0%VDD to 100%VDD without adjusting the AGND value. The OFFSET parameter is often used to set the offset in the application's output transfer characteristic. 10.2 Thermal VOQ Drift (DRIFT) The Thermal VOQ Drift is tuned using 4 bits. This parameter, DRIFT, is calibrated for each unit by Melexis during final test. The value is set to achieve a VOQ accuracy below 10mV over a temperature span of 25°C to 150°C. This parameter is not used by the end customer. 10.3 Sensitivity, Rough Gain and Fine Gain The Sensitivity of the MLX90251 is controlled through parameters linked to dedicated internal amplification stages. The parameter Rough Gain (RG), or pre-amplifier, has 4 bits for adjustment of two stages. The two MSB affect the Differential Input Differential Output (DIDO) stage. The two LSB effect the Differential to Single output (DTS) stage. The gain of both the DIDO and DTS are multiplied to get the total RG. The table below shows the theoretical small signal amplifier gain vs. the parameter RG. The pre-amplifier is chopper stabilized and the refresh frequency is adapted automatically to the RG setting to match the chopper gain- bandwidth product. Rough Gain (MSB LSB) DIDO DTS Gain 00 (00 00) 16 1.0 16 01 (00 01) 16 1.5 24 02 (00 10) 16 2.33 37 03 (00 11) 16 4.0 64 04 (01 00) 39 1.0 39 05 (01 01) 39 1.5 59 06 (01 10) 39 2.33 91 07 (01 11) 39 4.0 156 08 (10 00) 82 1.0 82 09 (10 01) 82 1.5 123 10 (10 10) 82 2.33 191 11 (10 11) 82 4.0 328 12 (11 00) 205 1.0 205 13 (11 01) 205 1.5 308 14 (11 10) 205 2.33 477 15 (11 11) 205 4.0 820 Table 8: MLX90251 Rough Gain Small Signal Amplifier Gain |
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