ADC0808 datasheet(4/14 Pages) NSC

4 / 14 page

Electrical Characteristics (Continued)

Digital Levels and DC Specifications: ADC0808CJ 4.5V

≤V

CC≤5.5V, −55˚C≤TA≤+125˚C unless otherwise noted

ADC0808CCJ, ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75

≤V

CC≤5.25V, −40˚C≤TA≤+85˚C unless

otherwise noted

Symbol

Parameter

Conditions

Min

Typ

Max

Units

DATA OUTPUTS AND EOC (INTERRUPT)

OUT(1)

Logical “1” Output Voltage

O=−360 µA

CC−0.4

OUT(0)

Logical “0” Output Voltage

O=1.6 mA

0.45

OUT(0)

Logical “0” Output Voltage EOC

O=1.2 mA

0.45

OUT

TRI-STATE Output Current

O=5V

µA

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

Minimum Start Pulse Width

(

Figure 5)

100

200

WALE

Minimum ALE Pulse Width

(

Figure 5)

100

200

Minimum Address Set-Up Time

(

Figure 5)25

Minimum Address Hold Time

(

Figure 5)25

Analog MUX Delay Time

S=0Ω (Figure 5)

2.5

µS

From ALE

H1,tH0

OE Control to Q Logic State

L=50 pF, RL=10k (Figure 8)

125

250

1H,t0H

OE Control to Hi-Z

L=10 pF, RL=10k (Figure 8)

125

250

Conversion Time

c=640 kHz, (Figure 5) (Note 7)

100

116

µS

Clock Frequency

640

1280

kHz

EOC

EOC Delay Time

(

Figure 5)

8+2 µS

Clock

Periods

Input Capacitance

At Control Inputs

OUT

TRI-STATE Output

At TRI-STATE Outputs

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 2. 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 *NO TGT: fig NS0592*). 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.

ADC0808 датащи(PDF) 4 Page - National Semiconductor (TI)

ADC0808 датащи(HTML) 4 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14

датащи скачать

ссылки URL