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ADC1005CCJ 데이터시트(PDF) 4 Page - National Semiconductor (TI) |
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ADC1005CCJ 데이터시트(HTML) 4 Page - National Semiconductor (TI) |
4 / 12 page AC Electrical Characteristics The following specifications apply for V CC = 5V, VREF = 5V,VREF = 5V, tr=tf= 20 ns unless otherwise specified. Boldface lim- its apply from T MIN to TMAX; All other limits TA = Tj = 25˚C. Typ Tested Design Limit Parameter Conditions (Note 5) Limit Limit Units (Note 6) (Note 7) f CLK, Clock Frequency MIN 0.2 0.2 MHz MAX 2.6 2.6 MHz Clock Duty Cycle MIN 40 40 % MAX 60 60 % t C, Conversion Time MIN 80 80 1/f CLK MAX 90 90 1/f CLK MIN f CLK=1.8 MHz 45 45 µs MAX f CLK=1.8 MHz 50 50 µs t W(WR)L, Minimum WR Pulse Width CS =0 100 150 150 ns t ACC, Access Time (Delay from falling edge of RD to Output Data Valid) CS =0 170 300 300 ns C L=100 pF, RL = 2k t 1H,t0H, TRI-STATE Control (Delay from Rising Edge of RD to Hi-Z State) R L=10k, CL=10 pF 125 200 ns R L=2k, CL=100 pF 145 230 230 ns t WI,tRI, Delay from Falling Edge of WR or RD to Reset of INTR 300 450 450 ns t IRS, INTR to 1st Read Set-up Time 400 550 550 ns C IN, Capacitance of Logic Inputs 5 7.5 pF C OUT, Capacitance of Logic Outputs 5 7.5 pF Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its specified operating conditions. Note 2: All voltages are measured with respect to ground. Note 3: Linearity error is defined as the deviation of the analog value, expressed in LSBs, from the straight line which passes through the end points of the transfer characteristic. Note 4: For VIN(−)≥VIN(+) the digital output code will be 00 0000 0000. Two on-chip diodes are tied to each analog input which will forward conduct for analog input voltages one diode drop below ground or one diode drop greater than VCC supply. Be careful, during testing at low VCC levels (4.5V), as high level analog inputs (5V) can cause this input diode to conduct, especially at elevated temperatures, and cause errors for analog inputs near full-scale. The spec allows 50 mV forward bias of either diode. This means that as long as the analog VIN does not exceed the supply voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 VDC to5VDC input voltage range will therefore require a minimum supply voltage of 4.950 VDC over temperature variations, initial tolerance and loading. Note 5: Typicals are at 25˚C and represent most likely parametric norm. Note 6: Tested and guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 7: Guaranteed, but not 100% production tested. These limits are not used to calculate outgoing quality levels. Note 8: Human body model, 100 pF discharged through a 1.5 k Ω resistor. www.national.com 4 |
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