ADC0820 datasheet(3/14 Pages) PHILIPS

3 / 14 page

Philips Semiconductors Linear Products

Product specification

ADC0820

8-Bit, high-speed,

µP-compatible A/D converter with

track/hold function

August 31, 1994

570

PIN DESCRIPTION (Continued)

PIN NO

SYMBOL

DESCRIPTION

RD Mode

INT going Low indicates that the conversion is completed and the data result is in the output latch. INT is reset by

the rising edge of RD or CS (see Figure 1).

GND

Ground

VREF(-)

The bottom of resistor ladder, voltage range: GND

≤VREF(-)≤VREF(+)

VREF(+)

The top of resistor ladder, voltage range: VREF(-)≤VREF(+)≤VDD.

CS must be Low in order for the RD or WR to be recognized by the converter.

DB4

3-State data output—Bit 4

DB5

3-State data output—Bit 5

DB6

3-State data output—Bit 6

DB7

3-State data output—Bit 7 (MSB)

OFL

Overflow output—if the analog input is higher than the VREF(+)- LSB, OFL will be low at the end of conversion. It can

be used to cascade 2 or more devices to have more resolution (9, 10-bit). It is always active and never becomes

3-state.

No connection

VDD

Power supply voltage

ABSOLUTE MAXIMUM RATINGS1, 2

SYMBOL

PARAMETER

RATING

UNIT

VDD

Supply voltage

Logic control inputs

-0.2 to VDD+0.2

Voltage at other inputs and output

-0.2 to VDD+0.2

TSTG

Storage temperature range

-65 to +150

°C

Maximum power dissipation3

TA=25°C(still-air)

N package

1690

D package

1390

TSOLD

Lead temperature (soldering, 10sec)

300

°C

Operating ambient temperature range

TMIN≤TA≤TMAX

ADC0820CNEN/CNED

0 to +70

°C

NOTES:

1. Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.

2. All voltages are measured with respect to GND, unless otherwise specified.

3. Derate above 25

°C at the following rates:

N package at 13.5mW/

°C

D package at 11.1mW/

°C

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