Texas Instruments ADS1205 Handleiding

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SBAS312B − JANUARY 2005 − REVISED AUGUST 200

7

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FEATURES

D16-Bit Resolution

D14-Bit Linearity

D±2.5V Input Range at 2.5V

DInternal Reference Voltage: 2%

DGain Error: 0.5%

DTwo Independent Delta-Sigma Modulators

DTwo Input Reference Buffers

DOn-Chip 20MHz Oscillator

DSelectable Internal or External Clock

DOperating Temperature Range:

−40°C to +85°C

DQFN-24 (4x4) Package

APPLICATIONS

DMotor Control

DCurrent Measurement

DIndustrial Process Control

DInstrumentation

DResolver

DESCRIPTION

The ADS1205 is a two-channel, high-performance,

delta-sigma (∆Σ) modulator with more than 98dB dynamic

range, operating from a single +5V supply. The differential

inputs are ideal for direct connection to transducers in an

industrial environment. With the appropriate digital filter

and modulator rate, the device can be used to achieve

16-bit analog-to-digital (A/D) conversion with no missing

codes. Effective resolution of 14 bits can be obtained with

a digital filter bandwidth of 40kHz at a modulator rate of

10MHz. The ADS1205 is designed for use in

high-resolution measurement applications including

current measurements, smart transmitters, industrial

process control, and resolvers. It is available in a QFN-24

(4x4) package.

2nd−Order

∆Σ

Modulator

CHA+

AV

DD

CHA

−

Output

Interface

Circuit

RC

Oscillator

20MHz

OutEN

Clock

Select

Divider

REFINA

Reference

Voltage

2.5V

REFOUT

OUTA

OUTB

CLKIN

AGNDBGND

BV

DD

CLKOUT

CLKSEL

2nd−Order

∆Σ

Modulator

CHB+

CHB

−

REFINB

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semiconductor products and disclaimers thereto appears at the end of this data sheet.

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