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DS4305R+TR Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS4305R+TR Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page Sample-and-Infinite Hold Voltage Reference 6 _____________________________________________________________________ Detailed Description The DS4305 provides a precise, NV output voltage, VOUT, making it an ideal solution for factory calibration of embedded systems. The DS4305 output voltage can be adjusted over almost the entire operating supply range of the device, and it can be precisely set to with- in ±1.5mV. A graphical description of the DS4305 is provided in the block diagram. During factory calibration, a simple adjustment proce- dure must be followed. This entire procedure includes setting VIN, toggling ADJ, waiting as VOUT self-adjusts, and waiting for the completion of the EEPROM storage cycle (see the timing diagram in Figure 1). At the start of calibration, a voltage must be placed on VIN. This voltage needs to be completely stable before the adjustment procedure begins, and it must remain sta- ble throughout the entire adjustment procedure. The DS4305 starts its self-adjust procedure when the ADJ pin is pulled low and held low for at least tADJ, after which it can be released at any time. Once ADJ has been released, it should not be toggled again for the remainder of the adjustment procedure. After the falling edge on ADJ and the wait time, tADJ, the VOUT self- adjust period begins. The length of the VOUT self-adjust period can be determined using the formula ∆V x tST, where ∆V is | VOUT OLD - VOUT NEW |. ADJ GND VOUT VCC VCC VIN VCC RPD RPU VREF ADC AND CONTROL EEPROM 12-BIT DAC DS4305 Figure 1. Timing Diagram PIN NAME FUNCTION 1 ADJ Adjust Control Input 2 GND Ground 3VIN Sample Voltage Input 4 VOUT Voltage Output 5VCC Power-Supply Voltage Pin Description Block Diagram VOUT VIN ADJ tW tW FIRST PROGRAMMING CYCLE ADDITIONAL PROGRAMMING CYCLES (IF REQUIRED) tADJ tADJ tADJ ∆VOUT x tST ∆VOUT x tST ∆VOUT ∆VOUT |
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