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ADC0834 датащи(PDF) 8 Page - Texas Instruments |
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ADC0834 датащи(HTML) 8 Page - Texas Instruments |
8 / 13 page Standby input current (see Note 4) µA II(stdby) ADC0834A, ADC0838A, ADC0834B, ADC0838B A/D PERIPHERALS WITH SERIAL CONTROL SLAS007 – AUGUST 1985 – REVISED OCTOBER 1986 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 8 electrical characteristics over recommended range of operating free-air temperature, VCC = V + = 5 V, fclock = 250 kHz (unless otherwise noted) (continued) analog and converter section PARAMETER TEST CONDITIONS† MIN TYP‡ MAX UNIT – 0.05 VICR Common-mode input voltage range See Note 3 to V VCC+ 0.05 On-channel VI = 5 V 1 Off-channel VI = 0 –1 On-channel VI = 0 –1 Off–channel VI = 5 V 1 ri(REF) Input resistance to reference ladder 1.3 2.4 5.9 k Ω total device PARAMETER TEST CONDITIONS† MIN TYP‡ MAX UNIT VZ Internal zener diode breakdown voltage II = 15 mA at V+ pin, See Note 2 6.3 7 8.5 V ICC Supply current 1 2.5 mA † All parameters are measured under open-loop conditions with zero common-mode input voltage. ‡ All typical values are at VCC = 5 V, V+ = 5 V, TA = 25°C. NOTES: 4. Internal zener diodes are connected from the VCC input to ground and from the V+ input to ground. The breakdown voltage of each zener diode is approximately 7 V. One zener diode can be used as a shunt regulator and connects to VCC through a regular diode. When the voltage regulator powers the converter, this zener and regular diode combination ensures that the VCC input (6.4 V) is less than the zener breakdown voltage. A series resistor is recommended to limit current into the V+ input. 5. If channel IN– is more positive than channel IN+, the digital output code will be 0000 0000. Connected to each analog input are two on-chip diodes that conduct forward current for analog input voltages one diode drop above VCC .Care must be taken during testing at low VCC levels (4.5 V) because high-level analog input voltage (5 V) can, especially at high temperatures, cause this input diode to conduct and cause errors for analog input s that are near full-scale. As long as the analog voltage does not exceed the supply voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 V to 5 V input voltage range requires a minimum VCC of 4.950 V for all variations of temperature and load. 6. Standby input currents are currents going into or out of the on or off channels when the A/D converter is not performing conversion and the clock is in a high or low steady-state condition. |
Аналогичный номер детали - ADC0834 |
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Аналогичное описание - ADC0834 |
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