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MAX544AEPA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX544AEPA Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 12 page +5V, Serial-Input, Voltage-Output, 14-Bit DACs _______________________________________________________________________________________ 7 Detailed Description The MAX544/MAX545 voltage-output, 14-bit digital-to- analog converters (DACs) offer full 14-bit performance with less than 0.5LSB integral linearity error and less than 0.9LSB differential linearity error, thus ensuring monotonic performance. Serial-data transfer minimizes the number of package pins required. The MAX544/MAX545 are composed of two matched DAC sections, with an inverted R-2R DAC forming the LSBs and the four MSBs derived from 15 identically matched resistors. This architecture allows the lowest glitch energy to be transferred to the DAC output on major-carry transitions. It also lowers the DAC output impedance by a factor of eight compared to a standard R-2R ladder, allowing unbuffered operation in medium- load applications. The MAX545 provides matched bipolar offset resistors, which connect to an external op amp for bipolar output swings (Figure 2b). For optimum performance, the MAX545 also provides a set of Kelvin connections to the voltage-reference and analog-ground inputs. MAX545 MAX400 AGNDF DGND (GND) VDD REFF REFS RINV RFB RFB INV OUT LDAC SCLK DIN CS AGNDS 0.1 µF +5V EXTERNAL OP AMP MC68XXXX PCS0 MOSI SCLK IC1 BIPOLAR OUT +5V -5V 0.1 µF +2.5V 10 µF Figure 2b. Typical Operating Circuit—Bipolar Output MAX544/MAX545 MAX495 DGND ( ) ARE FOR MAX545 ONLY (GND) VDD (REFS) REF (REFF) OUT SCLK DIN CS AGND_ 0.1 µF 0.1 µF +5V +2.5V EXTERNAL OP AMP MC68XXXX PCS0 MOSI SCLK UNIPOLAR OUT (LDAC) 10 µF Figure 2a. Typical Operating Circuit—Unipolar Output |
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