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DAC121S101QML Datasheet(PDF) 19 Page - Texas Instruments |
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DAC121S101QML Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 26 page  LP2980 DAC121S101 DIN SCLK SYNC VOUT = 0V to 5V 1 PF Input Voltage ON / OFF VIN VOUT LP3985 DAC121S101 DIN SCLK SYNC VOUT = 0V to 5V 1 PF 0.1 PF Input Voltage 0.01 PF DAC121S101QML www.ti.com SNAS410E – MAY 2008 – REVISED MARCH 2013 The minimum resistor value in the circuit of Figure 40 should 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, the resistor value at its minimum due to tolerance, and the DAC121S101 draws zero current. The maximum resistor value must allow the LM4050 to draw more than its minimum current for regulation plus the maximum DAC121S101 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 DAC121S101 draws its maximum current. These conditions can be summarized as R(min) = ( VIN(max) − VZ(min) / (IA(min) + IZ(max)) (3) and R(max) = ( VIN(min) − VZ(max) / (IA(max) + IZ(min) ) (4) 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, IA(max) is the maximum DAC121S101 supply current, and IA(min) is the minimum DAC121S101 supply current. 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 DAC121S101. 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 41. 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. LP2980 The LP2980 is an ultra low dropout regulator with a 0.5% or 1.0% accuracy over temperature, depending upon grade. It is available in 3.0V, 3.3V and 5V versions, among others. Figure 42. Using the LP2980 regulator Copyright © 2008–2013, Texas Instruments Incorporated Submit Documentation Feedback 19 Product Folder Links: DAC121S101QML |
Similar Part No. - DAC121S101QML_16 |
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Similar Description - DAC121S101QML_16 |
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