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ADC0808CCN Arkusz danych(PDF) 4 Page - National Semiconductor (TI) |
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ADC0808CCN Arkusz danych(HTML) 4 Page - National Semiconductor (TI) |
4 / 14 page Electrical Characteristics (Continued) Digital Levels and DC Specifications: ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75 ≤V CC≤5.25V, −40˚C ≤T A≤+85˚C unless otherwise noted Symbol Parameter Conditions Min Typ Max Units DATA OUTPUTS AND EOC (INTERRUPT) V OUT(1) Logical “1” Output Voltage V CC = 4.75V I OUT = −360µA I OUT = −10µA 2.4 4.5 V(min) V(min) V OUT(0) Logical “0” Output Voltage I O=1.6 mA 0.45 V V OUT(0) Logical “0” Output Voltage EOC I O=1.2 mA 0.45 V I OUT TRI-STATE Output Current V O=5V 3 µA V O=0−3 µA Electrical Characteristics Timing Specifications V CC=VREF(+)=5V, VREF(−)=GND, tr=tf=20 ns and TA=25˚C unless otherwise noted. Symbol Parameter Conditions MIn Typ Max Units t WS Minimum Start Pulse Width ( Figure 5) 100 200 ns t WALE Minimum ALE Pulse Width ( Figure 5) 100 200 ns t s Minimum Address Set-Up Time ( Figure 5)25 50 ns t H Minimum Address Hold Time ( Figure 5)25 50 ns t D Analog MUX Delay Time R S=0Ω (Figure 5) 1 2.5 µs From ALE t H1,tH0 OE Control to Q Logic State C L=50 pF, RL=10k (Figure 8) 125 250 ns t 1H,t0H OE Control to Hi-Z C L=10 pF, RL=10k (Figure 8) 125 250 ns t c Conversion Time f c=640 kHz, (Figure 5) (Note 7) 90 100 116 µs f c Clock Frequency 10 640 1280 kHz t EOC EOC Delay Time ( Figure 5) 0 8+2 µS Clock Periods C IN Input Capacitance At Control Inputs 10 15 pF C OUT TRI-STATE Output At TRI-STATE Outputs 10 15 pF Capacitance 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 GND, unless othewise specified. Note 3: A zener diode exists, internally, from VCC to GND and has a typical breakdown voltage of 7 VDC. Note 4: 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 the VCCn supply. The spec allows 100 mV forward bias of either diode. This means that as long as the analog VIN does not exceed the supply voltage by more than 100 mV, the output code will be correct. To achieve an absolute 0VDC to 5VDC input voltage range will therefore require a minimum supply voltage of 4.900 VDC over temperature variations, initial tolerance and loading. Note 5: Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors. See Figure 3. None of these A/Ds requires a zero or full-scale adjust. How- ever, if an all zero code is desired for an analog input other than 0.0V, or if a narrow full-scale span exists (for example: 0.5V to 4.5V full-scale) the reference voltages can be adjusted to achieve this. See Figure 13. Note 6: Comparator input current is a bias current into or out of the chopper stabilized comparator. The bias current varies directly with clock frequency and has little temperature dependence ( Figure 6). See paragraph 4.0. Note 7: The outputs of the data register are updated one clock cycle before the rising edge of EOC. Note 8: Human body model, 100 pF discharged through a 1.5 k Ω resistor. www.national.com 4 |
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