ADC0801/ADC0802/ADC0803/ADC0804/ADC0805

8-Bit µP Compatible A/D Converters

General Description

The ADC0801, ADC0802, ADC0803, ADC0804 and ADC0805 are CMOS 8-bit successive approximation A/D converters that use a differential potentiometric ladder — similar to the 256R products. These converters are designed to allow operation with the NSC800 and INS8080A derivative control bus with TRI-STATE output latches directly driving the data bus. These A/Ds appear like memory locations or I/O ports to the microprocessor and no interfacing logic is needed.

Differential analog voltage inputs allow increasing the common-mode rejection and offsetting the analog zero input voltage value. In addition, the voltage reference input can be adjusted to allow encoding any smaller analog voltage span to the full 8 bits of resolution.

Features

Compatible with 8080 µP derivatives — no interfacing logic needed - access time - 135 ns

Easy interface to all microprocessors, or operates “stand alone”

Differential analog voltage inputs

Logic inputs and outputs meet both MOS and TTL voltage level specifications

Works with 2.5V (LM336) voltage reference

On-chip clock generator

0V to 5V analog input voltage range with single 5V supply

No zero adjust required

0.3" standard width 20-pin DIP package

20-pin molded chip carrier or small outline package

Operates ratiometrically or with 5 VDC, 2.5 VDC, or analog span adjusted voltage reference

Key Specifications

Resolution 8 bits

Total error ±1⁄4 LSB, ±1⁄2 LSB and ±1 LSB

Conversion time 100 µs

Absolute Maximum Ratings (Notes 1, 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Voltage (V_CC) (Note 3) 6.5V

Voltage

Logic Control Inputs −0.3V to +18V

At Other Input and Outputs −0.3V to (VCC+0.3V)

Lead Temp. (Soldering, 10 seconds)

Dual-In-Line Package (plastic) 260˚C

Dual-In-Line Package (ceramic) 300˚C

Surface Mount Package

Vapor Phase (60 seconds) 215˚C

Infrared (15 seconds) 220˚C

Storage Temperature Range −65˚C to +150˚C

Package Dissipation at TA=25˚C 875 mW

ESD Susceptibility (Note 10) 800V

Operating Ratings (Notes 1, 2)

Temperature Range T_MIN≤T_A≤T_MAX

ADC0804LCJ −40˚C≤T_A≤+85˚C

ADC0801/02/03/05LCN −40˚C≤T_A≤+85˚C

ADC0804LCN 0˚C≤T_A≤+70˚C

ADC0802/04LCWM 0˚C≤T_A≤+70˚C

Range of V_CC 4.5 V_DC to 6.3 V_DC

Connection Diagram

Typical Applications

Physical Dimensions inches (millimeters) unless otherwise noted

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