MP8775

Rev. 3.01

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z (510) 668-7017

E

1999

CMOS

20 MSPS, 8-Bit, High Speed

Analog-to-Digital Converter

FEATURES

· 8-Bit Resolution

· 20 MHz Sampling Rate

· DNL = +1/2 LSB, INL = +1 LSB (typ)

· Internal S/H Function

· Single Supply: 5 V

· Low Power: 85 mW typ. (excluding reference)

· Latch-Up Free

· ESD Protection: 2000 V Minimum

· Power Down Available: MP8776

· 3 V Version: MP87L75

· Small 20 Pin SOIC Package

APPLICATIONS

· Digital Color Copiers

· Cellular Telephones

· CCD’s Based Systems

· Hardware Scanners

· Video Capture Boards

March 1999-4

GENERAL DESCRIPTION

The MP8775 is an 8-bit Analog-to-Digital Converter in a

small 20 pin SOIC package.

Designed using an

advanced 5 V CMOS process, this part offers excellent

performance, low power consumption and latch-up free

operation.

This device uses a two-step flash architecture to maintain

low power consumption at high conversion rates. The

input circuitry of the MP8775 includes an on-chip S/H

function and allows the user to digitize analog input

layout have achieved a low analog input capacitance.

This reduces “kickback” and eases the requirements of

the buffer/amplifier used to drive the MP8775.

The designer can choose the internally generated

voltages allows easy interface to any input signal range

adjust these voltages to cancel zero scale and full scale

errors, or to change the input range as needed.

The device operates from a single +5 V supply. Power

Specified for operation over the commercial / industrial

(--40 to +85°C) temperature range, the MP8775 is

available in Surface Mount (SOIC), Shrunk Small Outline

(SSOP) and Plastic dual-in-line (PDIP) packages.

SIMPLIFIED BLOCK AND TIMING DIAGRAM

MSB

Comp.

LSB

Comp.

Latch

Latch

Encoder

+

Error

Correction

F/F

S/H

Clock Logic

AGND

DB7 (MSB)

DB0 (LSB)

CLK

DGND

GND

N

N-3

N-2

N-1

N

CLK

DB7-

DB0

Sample