|ADC0809||8-Bit µP Compatible A/D Converters with 8-Channel Multiplexer|
National ->Texas Instruments
|ADC0809 Datasheet PDF : 14 Pages |
Electrical Characteristics (Continued)
Digital Levels and DC Specifications: ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75≤VCC≤5.25V,
−40˚C≤TA≤+85˚C unless otherwise noted
DATA OUTPUTS AND EOC (INTERRUPT)
Logical “1” Output Voltage
Logical “0” Output Voltage
Logical “0” Output Voltage EOC
TRI-STATE Output Current
VCC = 4.75V
IOUT = −360µA
IOUT = −10µA
Timing Specifications VCC=VREF(+)=5V, VREF(−)=GND, tr=tf=20 ns and TA=25˚C unless otherwise noted.
Minimum Start Pulse Width
Minimum ALE Pulse Width
Minimum Address Set-Up Time
Minimum Address Hold Time
Analog MUX Delay Time
RS=0Ω (Figure 5)
OE Control to Q Logic State
OE Control to Hi-Z
EOC Delay Time
CL=50 pF, RL=10k (Figure 8)
CL=10 pF, RL=10k (Figure 8)
fc=640 kHz, (Figure 5) (Note 7)
At Control Inputs
At TRI-STATE Outputs
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 kΩ resistor.
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