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MP7226KN Datasheet(PDF) 9 Page - Exar Corporation |
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MP7226KN Datasheet(HTML) 9 Page - Exar Corporation |
9 / 16 page MP7226 9 Rev. 2.00 APPLICATIONS INFORMATION Power On Reset At power up, all inputs are reset to 0 V if WR = 1. For WR = 0, the addressed DAC will receive input data. Power Supply The MP7226 can operate with either a single or dual power supply. Improved zero-code settling error can be obtained by using dual power supplies. The dual power supply specifica- tions are a positive supply (VDD) range of +10.5V to +16.5V, and a –5V supply (VSS) . The single power supply specifications are a positive supply (VDD) range of +10.5V to +16.5V, or range of +4.75V to 5.5V . The specified reference voltage (VREF) range under these conditions is from +2V to VDD –4V. For those appli- cations requiring +10V at the output (VREF = +10V), VDD must be +14V minimum to meet data sheet limits . 8-bit performance is guaranteed for single supply operation (VSS = 0V); however, zero code output sink capability is improved with VSS = –5V. For adequate DAC and Buffer operation, VREF must always be be- low VDD by at least 3.5V. Power Supply Decoupling The Power Supplies used with the MP7226 should be well regulated and filtered. Local power supply decoupling consist- ing of a 10 µF tantalum capacitor in parallel with a 0.01µF ce- ramic is recommended. The decoupling capacitors should be connected between the VDD and AGND, and between VSS and AGND if VSS = –5V. Unipolar Output Operation In this configuration, the reference voltage is the same polar- ity as the output voltage. Since the reference voltage must al- ways be positive with respect to GND, the output can only be 0 or positive. Table 2. shows the code relationship for the part in unipolar operation Table 2. Unipolar Code Table 1 1 1 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 1 0 1 1 0 Digital Input Analog Output, VOUT ) VREF (255 256) ) VREF (129 256) ) VREF (128 256) +) VREF 2 ) VREF (127 256) ) VREF ( 1 256) 0 V Note :1 LSB + (2*8) (VREF) + 1 256 (VREF) Table 3. Bipolar Code Table 1 1 1 0 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 1 0 1 1 0 Digital Input Analog Output ) VREF ( 1 128) * VREF ( 1 128) * VREF (127 128) 0 V ) VREF (127 128) * VREF (128 128) + * VREF |
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