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A3907ECGTR Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A3907ECGTR Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 11 page Low Voltage Voice Coil Motor Driver A3907 8 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Output Voltage Range To guarantee the accuracy and linearity of the programmed cur- rent, the voltage on the IOUT pin, VOUT, should be greater than 350 mV. The output voltage is a function of the battery voltage, motor resistance, and the programmed load current, IOUT. Clamp Diode When the IC output is turned off, the load inductance causes the output voltage, VOUT, to rise. An internal clamp diode, connected between the IOUT and VDD pins, is integrated into the IC to ensure the output voltage remains at a safe level. ¯S¯¯L¯¯E¯¯E¯¯P¯ Pin The S¯¯L¯¯E¯¯E¯¯P¯ pin is an active low input. A logic low signal disables all of the internal circuitry and prevents the IC from draining bat- tery power. Applications Information Headroom The current may not reach the programmed level if there is not adequate headroom in the output circuit. The IC output voltage must be over 350mV to guarantee normal linear operation. VDD, ILOAD, and RLOAD can be adjusted to ensure the device operates in the linear range. When equation 7 is not satisfied, the load current will be limited by the series impedance and may not reach the programmed level. VDD(min) – RLOAD(max) × IOUT(max) ≥ 350 mV . (7) IOUT Errors Defined Relative Accuracy (INL) This error is calculated by measuring the worse case deviation from a straight line defined from end- points. The straight line endpoints are defined by the actual mea- sured values at Level Control code 63 and 1023 (see figure 2). Differential Nonlinearity (DNL) A measure of the monoto- nicity of the DAC (see equation 8). The slope of the line must always be positive for each incremental step. DNL = (IOUT(n+1) – IOUT(n)) / LSB , (8) where (n = 64 to 1023). DNL should be < 1 LSB. Offset Error The measured output current at Level Control code 64, compared to the ideal value according to the transfer function: 6.4 mA. Gain Error The difference between the slopes of the ideal transfer function and the actual transfer function. The gain error is calculated by subtracting the offset error at Level Control code 16 from the actual transfer function. This calculated value is com- pared to the ideal transfer function and reported as a percentage of the ideal full scale value: 102.3 mA (see figure 3). Gain Error Drift The change in slope of the transfer function due to temperature, expressed as LSB / °C. |
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