MP8820

1

Rev. 1.00

8-Bit Analog-to-Digital Converter

with an 8-Channel MUX

FEATURES

• Precision 7–Bit Plus Sign ADC

• 8 Channel Analog Mux

• Single Reference to GND

• DNL= ±1/2 LSB, INL=± 1 LSB

• Single Supply: 5 V

• ESD Protection: 2000 V

APPLICATIONS

• Servo Control

• Low Cost Audio Control

• Voice Acquisition

GENERAL DESCRIPTION

The MP8820 is a precision 1.6 MHz sampling 7-bit plus sign

Analog-to-Digital Converter with an eight channel input mux and

µP interface. The device has internal circuitry which receives

erally ground, this structure allows the user to easily generate an

reference source.

The internal ADC reference voltages are capable of swinging

to within 0.5 V of the supply rails, giving the MP8820 a wide

range over which the effective channel gain can be adjusted.

The MP8820 uses a two-step flash conversion technique.

The first section determines the sign and the 3 MSBs while the

second segment converts the 4 LSBs. The ADC conversion be-

gins when WR goes low and the data is valid 500 ns after the

rising edge of WR. The MP8820 operates from a single 5V sup-

ply and consumes only 175mW of power.

Specified for operation over the industrial (–40 to +85

°C)

temperature range, the MP8820 is available in Surface Mount

(SOIC) and Shrunk Small Outline (SSOP) packages.

8

3

8

8:1 MUX

T/H

A0-A2

DB0-DB7

WR

8-Bit

ADC

Control

+

–

G=1

+

–

G=1

+

–

G=1

SIMPLIFIED BLOCK DIAGRAM

GND