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DAC122S085 Datasheet(PDF) 17 Page - Texas Instruments |
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DAC122S085 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 28 page  LP3985 1 PF 0.1 PF Input Voltage 0.01 PF VOUT = 0V to 5V DAC122S085 DIN SCLK SYNC VA VREFIN 0.1 PF LM4050-4.1 or LM4050-5.0 VOUT = 0V to 5V 0.47 PF Input Voltage R VZ DAC122S085 DIN SCLK SYNC VA VREFIN 0.1 PF IZ IDAC DAC122S085 www.ti.com SNAS361E – MAY 2006 – REVISED MARCH 2013 Figure 32. The LM4050 as a power supply The minimum resistor value in the circuit of Figure 32 must be chosen such that the maximum current through the LM4050 does not exceed its 15 mA rating. The conditions for maximum current include the input voltage at its maximum, the LM4050 voltage at its minimum, and the DAC122S085 drawing zero current. The maximum resistor value must allow the LM4050 to draw more than its minimum current for regulation plus the maximum DAC122S085 current in full operation. The conditions for minimum current include the input voltage at its minimum, the LM4050 voltage at its maximum, the resistor value at its maximum due to tolerance, and the DAC122S085 draws its maximum current. These conditions can be summarized as R(min) = ( VIN(max) − VZ(min) ) /IZ(max) (3) and R(max) = ( VIN(min) − VZ(max) ) / ( (IDAC(max) + IZ(min) ) where • VZ(min) and VZ(max) are the nominal LM4050 output voltages ± the LM4050 output tolerance over temperature • IZ(max) is the maximum allowable current through the LM4050 • IZ(min) is the minimum current required by the LM4050 for proper regulation • IDAC(max) is the maximum DAC122S085 supply current (4) LP3985 The LP3985 is a low noise, ultra low dropout voltage regulator with a 3% accuracy over temperature. It is a good choice for applications that do not require a precision reference for the DAC122S085. It comes in 3.0V, 3.3V and 5V versions, among others, and sports a low 30 µV noise specification at low frequencies. Since low frequency noise is relatively difficult to filter, this specification could be important for some applications. The LP3985 comes in a space-saving 5-pin SOT-23 and 5-bump DSBGA packages. Figure 33. Using the LP3985 regulator An input capacitance of 1.0µF without any ESR requirement is required at the LP3985 input, while a 1.0µF ceramic capacitor with an ESR requirement of 5m Ω to 500mΩ is required at the output. Careful interpretation and understanding of the capacitor specification is required to ensure correct device operation. Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: DAC122S085 |
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