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LTC1287CCJ Datasheet(PDF) 5 Page - Linear Technology |
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LTC1287CCJ Datasheet(HTML) 5 Page - Linear Technology |
5 / 16 page LTC1287 5 CC HARA TERISTICS A TYPICALPERFOR CE RSOURCE– (Ω) 100 0 300 400 500 1k 10k 100k LTC G10 200 100 VCC = 3V VREF = 2.5V CLK = 500kHz +IN –IN +VIN RSOURCE– RSOURCE+ (Ω) 100 1k 10k LTC1287 G13 1 10 100 + – VIN RSOURCE+ VREF = 2.5V VCC = 3V TA = 25°C 0V TO 2.5V INPUT STEP Sample-and-Hold Acquisition Time vs Source Resistance AMBIENT TEMPERATURE (°C) –50 0 100 300 400 500 1000 700 –10 30 50 130 LTC1287 G14 200 800 900 600 –30 10 70 90 110 ON CHANNEL OFF CHANNEL GUARANTEED Input Channel Leakage Current vs Temperature REFERENCE VOLTAGE (V) 0 0 0.2 0.3 0.4 0.5 0.6 0.7 0.5 1.0 1.5 2.0 LTC1287 G15 2.5 0.8 0.9 1.0 0.1 3.0 LTC1287 NOISE = 200 µVP-P Noise Error vs Reference Voltage Maximum Clock Rate vs Source Resistance Minimum Clock Rate for 0.1LSB Error** Maximum Filter Resistor vs Cycle Time *** MAXIMUM RFILTER REPRESENTS THE FILTER RESISTOR VALUE AT WHICH A 0.1LSB CHANGE IN FULL SCALE ERROR FROM ITS VALUE AT RFILTER = 0Ω IS FIRST DETECTED. * MAXIMUM CLK FREQUENCY REPRESENTS THE CLK FREQUENCY AT WHICH A 0.1LSB SHIFT IN THE ERROR AT ANY CODE TRANSITION FROM ITS 500kHz VALUE IS FIRST DETECTED. ** AS THE CLK FREQUENCY IS DECREASED FROM 1MHz, MINIMUM CLK FREQUENCY ( ∆ERROR ≤ 0.1LSB) REPRESENTS THE FREQUENCY AT WHICH A 0.1LSB SHIFT IN ANY CODE TRANSITION FROM ITS 500kHz VALUE IS FIRST DETECTED. # PIN FUNCTION DESCRIPTION 1 CS Chip Select Input A logic low on this input enables the LTC1287. 2, 3 +IN, –IN Analog Inputs These inputs must be free of noise with respect to GND. 4 GND Analog Ground GND should be tied directly to an analog ground plane. 5VREF Reference Input The reference input defines the span of the A/D converter and must be kept free of noise with respect to GND. 6DOUT Digital Data Output The A/D conversion result is shifted out of this output. 7 CLK Shift Clock This clock synchronizes the serial data transfer. 8VCC Positive Supply This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane. PI FU CTIO S CYCLE TIME ( µs) 10 100 1k 10k 10 1000 10000 LTC1287 G12 1 100 + – VIN CFILTER ≥1µF RFILTER AMBIENT TEMPERATURE (°C) –50 0.05 0.10 0.15 0.20 –25 025 50 LTC1287 G11 75 100 0.25 VCC = 3V |
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