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MP8775

CMOS 20 MSPS, 8-Bit, High Speed Analog-to-Digital Converter

Exar Corporation 

FEATURES

· 8-Bit Resolution

· 20 MHz Sampling Rate

· DNL = +1/2 LSB, INL = +1 LSB (typ)

· Internal S/H Function

· Single Supply: 5 V

· VIN DC Range: 0 V to VDD

· VREF DC Range: 1 V to VDD

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

· Latch-Up Free

· ESD Protection: 2000 V Minimum

MP8775

CMOS

20 MSPS, 8-Bit, High Speed

Analog-to-Digital Converter

March 1999-4

· 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

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

signals between GND and VDD. Careful design and chip

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

reference voltages by connecting VRB to VRBS and VRT to

VRTS, or provide external reference voltages to the VRB

and VRT pins. The internal reference generates 0.6 V at

VRB and 2.6 V at VRT. Providing external reference

voltages allows easy interface to any input signal range

between GND and VDD. This also allows the system to

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

consumption is 85 mW at Fs = 20 MHz.

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

VDD

AVDD DVDD

VRTS

VRT

VRB

VRBS

GND

MSB

Comp.

LSB

Comp.

Latch

Latch

Encoder

+

Error

F/F

Correction

S/H

Clock Logic

VIN

CLK

AGND

DB7 (MSB)

DB0 (LSB)

DGND

Sample

CLK N

DB7-

DB0

N-3 N-2 N-1 N

Rev. 3.01

E1999

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

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