LTC2435-1IGN datasheet(1/40 Pages) LINER

No de pièce	LTC2435-1IGN

Description	20-Bit No Latency ADCs with Differential Input and Differential Reference

PDF	40 Pages

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Fabricant	LINER [Linear Technology]

Site Internet	http://www.linear.com

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LTC2435/LTC2435-1

1

24351fa

■ 2×

××

×

× Speed Up Version of the LTC2430: 15Hz Output

Rate, 60Hz Notch—LTC2435; 13.75Hz Output Rate,

Simultaneous 50Hz/60Hz Notch—LTC2435-1

■ Differential Input and Differential Reference with

GND to VCC Common Mode Range

■ 3ppm INL, No Missing Codes

■ 10ppm Gain Error

■ 0.8ppm Noise

■ Single Conversion Settling Time for Multiplexed

Applications

■ Internal Oscillator—No External Components

Required

■ Single Supply 2.7V to 5.5V Operation

■ Low Supply Current (200µA,4µA in Auto Sleep)

■ 20-Bit ADC in Narrow SSOP-16 Package

(SO-8 Footprint)

The LTC

®2435/2435-1 are 2.7V to 5.5V micropower

20-bit differential ∆Σ analog to digital converters with

integrated oscillator, 3ppm INL and 0.8ppm RMS noise.

They use delta-sigma technology and provide single cycle

settling time for multiplexed applications. Through a

single pin, the LTC2435 can be configured for better than

110dB input differential mode rejection at 50Hz or 60Hz

±2%, or it can be driven by an external oscillator for a user

defined rejection frequency. The LTC2435-1 can be con-

figured for better than 87dB input differential mode rejec-

tion over the range of 49Hz to 61.2Hz (50Hz and 60Hz

±2% simultaneously). The internal oscillator requires no

external frequency setting components.

The converters accept any external differential reference

voltage from 0.1V to VCC for flexible ratiometric and

remote sensing measurement configurations. The full-

scale differential input range is from – 0.5VREF to 0.5VREF.

The reference common mode voltage, VREFCM, and the

input common mode voltage, VINCM, may be indepen-

dently set anywhere within the GND to VCC range of the

LTC2435/LTC2435-1. The DC common mode input rejec-

tion is better than 120dB.

The LTC2435/LTC2435-1 communicate through a flexible

3-wire digital interface which is compatible with SPI and

MICROWIRE

TM protocols.

, LTC and LT are registered trademarks of Linear Technology Corporation.

20-Bit No Latency ∆Σ

TM

ADCs with Differential Input and

Differential Reference

No Latency ∆Σ is a trademark of Linear Technology Corporation.

MICROWIRE is a trademark of National Semiconductor Corporation.

Protected by U.S. Patents including 6140950, 6169506.

VCC

FO

REF+

REF–

SCK

IN+

IN–

SDO

GND

CS

214

3

4

13

5

6

12

1, 7, 8, 9, 10, 15, 16

11

REFERENCE

VOLTAGE

0.1V TO VCC

ANALOG INPUT RANGE

–0.5VREF TO 0.5VREF

= INTERNAL OSC/50Hz REJECTION (LTC2435)

= EXTERNAL CLOCK SOURCE

= INTERNAL OSC/60Hz REJECTION (LTC2435)

= INTERNAL 50Hz/60Hz REJECTION (LTC2435-1)

3-WIRE

SPI INTERFACE

1µF

2.7V TO 5.5V

LTC2435/

LTC2435-1

2435 TA01

VCC

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO S

APPLICATIO S

■

Direct Sensor Digitizer

■ Weight Scales

■ Direct Temperature Measurement

■

Gas Analyzers

■ Strain Gage Transducers

■ Instrumentation

■

Data Acquisition

■ Industrial Process Control

■ 6-Digit DVMs

10

8

6

4

2

0

–2

–4

–6

–8

–10

INPUT VOLTAGE (V)

–2.5

–1.5

–0.5

0.5

1.5

2435 G04

2.5

FO = GND

VCC = 5V

VREF = 5V

VINCM = VINCM = 2.5V

TA = –45°C

TA = 25°C

TA = 85°C

Integral Nonlinearity vs Input

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