SAR ADC Power Scaling TIPL 4601 TI Precision

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SAR ADC Power Scaling TIPL 4601 TI Precision Labs – ADCs Created by Peggy

SAR ADC Power Scaling TIPL 4601 TI Precision Labs – ADCs Created by Peggy Liska 1

SAR ADC Power Scaling 1. (T/F) Most of the power is consumed by the

SAR ADC Power Scaling 1. (T/F) Most of the power is consumed by the SAR ADC during the acquisition phase. a. True b. False 2. You can always reduce the overall power consumption of a SAR ADC by _______. a. b. c. d. Decreasing the acquisition time Increasing the acquisition time Decreasing the SCLK speed Increasing the SCLK speed 2

SAR ADC Power Scaling 3. Which of the following is NOT a way to

SAR ADC Power Scaling 3. Which of the following is NOT a way to reduce digital supply (DVDD) power consumption? a. b. c. d. e. Decrease the digital logic voltage level Increase throughput of the ADC Reduce the trace capacitance of the SDI line Both a & c Both b & c 4. (T/F) Large feedback resistors on the front-end driver reduce power consumption but add noise. a. True b. False 3

SAR ADC Power Scaling 5. Calculate the digital supply power consumption using the following

SAR ADC Power Scaling 5. Calculate the digital supply power consumption using the following values: HINT: Use the Analog Engineer’s Calculator. • DVDD Voltage = 1. 8 V • SDO Trace Dimensions = 1000 mils long, 10 mils wide • Copper Thickness = 1 oz • PCB Thickness = 31 mils • Sampling rate = 1 MSPS • ADC Resolution = 12 -bit 4

Solutions 5

Solutions 5

SAR ADC Power Scaling 1. (T/F) Most of the power is consumed by the

SAR ADC Power Scaling 1. (T/F) Most of the power is consumed by the SAR ADC during the acquisition phase. a. True b. False 2. You can always reduce the overall power consumption of a SAR ADC by _______. a. b. c. d. Decreasing the acquisition time Increasing the acquisition time Decreasing the SCLK speed Increasing the SCLK speed 6

SAR ADC Power Scaling 3. Which of the following is NOT a way to

SAR ADC Power Scaling 3. Which of the following is NOT a way to reduce digital supply (DVDD) power consumption? a. b. c. d. e. Decrease the digital logic voltage level Increase throughput of the ADC Reduce the trace capacitance of the SDI line Both a & c Both b & c 4. (T/F) Large feedback resistors on the front-end driver reduce power consumption but add noise. a. True b. False 7

SAR ADC Power Scaling 5. Calculate the digital supply power consumption using the following

SAR ADC Power Scaling 5. Calculate the digital supply power consumption using the following values: HINT: Use the Analog Engineer’s Calculator. • DVDD Voltage = 1. 8 V L = 15. 14 n. H C = 1. 328 p. F • SDO Trace Dimensions = 1000 mils long, 10 mils wide • Copper Thickness = 1 oz • PCB Thickness = 31 mils • Sampling rate = 1 MSPS • ADC Resolution = 12 -bit 8

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