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LTC1274CSW Datasheet(PDF) 7 Page - Linear Integrated Systems |
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LTC1274CSW Datasheet(HTML) 7 Page - Linear Integrated Systems |
7 / 20 page 7 LTC1274/LTC1277 TYPICAL PERFORMANCE CHARACTERISTICS Reference Voltage vs Load Current LOAD CURRENT (mA) –6 2.435 2.430 2.425 2.420 2.415 2.410 2.405 –3 –1 LT1274/77 • TPC13 –5 –4 –2 0 1 Supply Current vs Temperature TEMPERATURE ( °C) –55 3.0 2.5 2.0 1.5 1.0 0.5 0 25 75 LT1274/77 • TPC11 –25 0 50 100 125 fSAMPLE = 100kHz Power Supply Feedthrough vs Ripple Frequency RIPPLE FREQUENCY (kHz) 1 10 100 1000 LTC1274/77 • TPC12 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 fSAMPLE = 100kHz AVDD (VRIPPLE = 1mV) VSS (VRIPPLE = 10mV) DGND (VRIPPLE = 0.1V) Supply Current vs Sample Rate With Sleep and Nap Modes SAMPLE RATE (Hz) 10000 1000 100 10 1 0.1 1k 100k LTC1274/77 • TPC15 10 1 10k 100 WITHOUT SLEEP OR NAP NAP = 5V (SLEEP MODE) NAP = REFRDY (SLEEP MODE) NAP MODE CREF = 4.7µF Wake-Up Time vs CREF (Sleep Mode) Supply Current vs Supply Voltage CREF (µF) 0 10 9 8 7 6 5 4 3 2 1 0 40 LTC1274/77 • TPC16 10 515 25 35 45 20 30 50 TA = 25°C SUPPLY VOLTAGE (V) 0 3.0 2.5 2.0 1.5 1.0 0.5 0 1 23 4 LTC1274/77 • TPC14 56 fSAMPLE = 100kHz PI FU CTIO S LTC1274 AIN (Pin 1): Analog Input. 0V to 4.096V, unipolar (VSS = 0V) or ±2.048V, bipolar (VSS = –5V). VREF (Pin 2): 2.42V Reference Output. Bypass to AGND (10 µFtantaluminparallelwith0.1µFceramic).VREFcanbe overdriven positive with an external reference voltage. AGND (Pin 3): Analog Ground. D11 to D4 (Pins 4 to 11): Three-State Data Outputs. D11 is the Most Significant Bit. DGND (Pin 12): Digital Ground. D3 to D0 (Pins 13 to 16): Three-State Data Outputs. REFRDY (Pin 17): Reference Ready Signal. It goes high when the reference has settled after SLEEP indicating that the ADC is ready to sample. SLEEP (Pin 18): SLEEP Mode Input. Tie this pin to low to put the ADC in Sleep mode and save power (REFRDY will go low). The device will draw 1 µA in this mode. CONVST (Pin 19): Conversion Start Signal. This active low signal starts a conversion on its falling edge (to recognize CONVST, CS has to be low.) |
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