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LTC1290DCN Datasheet(PDF) 7 Page - Linear Technology |
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LTC1290DCN Datasheet(HTML) 7 Page - Linear Technology |
7 / 32 page 7 LTC1290 1290fe Sample-and-Hold Acquisition Time vs Source Resistance RSOURCE+ (Ω) 100 1 10 100 1k 10k LTC1290 • TPC11 + – VIN RSOURCE+ VREF = 5V VCC = 5V TA = 25°C 0V TO 5V INPUT STEP ACLK FREQUENCY (MHz) 0 1.00 2.00 3.00 4.00 1290 • TPC13 200 180 160 140 120 100 80 60 40 20 VCC = 5V CMOS LEVELS Supply Current (Power Shutdown) vs ACLK Supply Current (Power Shutdown) vs Temperature AMBIENT TEMPERATURE, TA (°C) –50 10 9 8 7 6 5 4 3 2 1 0 –10 30 50 130 1290 • TPC12 –30 10 70 90 110 ACLK OFF DURING POWER SHUTDOWN Input Channel Leakage Current vs Temperature AMBIENT TEMPERATURE, TA (°C) –50 0 100 300 400 500 1000 700 –10 30 50 130 1290 • TPC14 200 800 900 600 –30 10 70 90 110 ON CHANNEL OFF CHANNEL GUARANTEED Noise Error vs Reference Voltage REFERENCE VOLTAGE, VREF (V) 0 0 0.25 0.75 1.00 1.25 2 4 5 2.25 1290 • TPC15 0.50 13 1.50 1.75 2.00 LTC1290 NOISE 200 µVP-P CH0 to CH7 (Pin 1 to Pin 8): Analog Inputs. The analog inputs must be free of noise with respect to AGND. COM (Pin 9): Common. The common pin defines the zero reference point for all single-ended inputs. It must be free of noise and is usually tied to the analog ground plane. DGND (Pin 10): Digital Ground. This is the ground for the internal logic. Tie to the ground plane. AGND (Pin 11): Analog Ground. AGND should be tied directly to the analog ground plane. V – (Pin 12): Negative Supply. Tie V – to most negative potential in the circuit. (Ground in single supply applica- tions.) REF –, REF + (Pins 13, 14): Reference Inputs. The refer- ence inputs must be kept free of noise with respect to AGND. CS (Pin 15): Chip Select Input. A logic low on this input enables data transfer. DOUT (Pin 16): Digital Data Output. The A/D conversion result is shifted out of this output. Maximum Filter Resistor vs Cycle Time CYCLE TIME, tCYC (µs) 10 100 1k 10k 10 1000 10000 1290 • TPC10 1.0 100 + – VIN CFILTER ≥ 1µF RFILTER ** MAXIMUM RFILTER REPRESENTS THE FILTER RESISTOR VALUE AT WHICH A 0.1LSB CHANGE IN FULL-SCALE ERROR FROM ITS VALUE AT RFILTER = 0 IS FIRST DETECTED. TYPICAL PERFOR A CE CHARACTERISTICS PI FU CTIO S |
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