MP8820 查看數據表（PDF） - Exar Corporation

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MP8820

8-Bit Analog-to-Digital Converter with an 8-Channel MUX

Exar Corporation 

FEATURES

• Precision 7–Bit Plus Sign ADC

• 8 Channel Analog Mux

• Single Reference to GND

• Input Referenced to User Supplied VMID

• DNL= ±1/2 LSB, INL=± 1 LSB

• Single Supply: 5 V

• ESD Protection: 2000 V

MP8820

8-Bit Analog-to-Digital Converter

with an 8-Channel MUX

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

the user supplied reference voltages VREF(+) and VREF(–), and

generates the ADC reference voltages VMID  (VREF(+) –

VREF(–)). Since VREF(+) is internally buffered and VREF(–) is gen-

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

input range biased about a user-supplied VMID from a grounded

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.

SIMPLIFIED BLOCK DIAGRAM

VDD

VMID

VREF(+)

VREF(–)

+

–

G=1

+

– G=1

+

– G=1

AIN0-AIN7

8

3

8:1 MUX

T/H

VRT AIN

8

VMID

8-Bit

ADC

VRB

Control

A0-A2

DB0-DB7

Rev. 1.00

GND

WR

1

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