LINEAR LTC2435 Data Sheet Manual Instruction Book

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LTC2435/LTC2435-1 20-Bit No Latency ∆ΣTM

ADCs with Differential Input and

Differential Reference FEATURES DESCRIPTIO

2× Speed Up Version of the LTC2430: 15Hz Output The LTC®2435/2435-1 are 2.7V to 5.5V micropower Rate, 60Hz Notch—LTC2435; 13.75Hz Output Rate, 20-bit differential ∆Σ analog to digital converters with Simultaneous 50Hz/60Hz Notch—LTC2435-1 integrated oscillator, 3ppm INL and 0.8ppm RMS noise.

Differential Input and Differential Reference with They use delta-sigma technology and provide single cycle GND to VCC Common Mode Range settling time for multiplexed applications. Through a 3ppm INL, No Missing Codes single pin, the LTC2435 can be configured for better than 10ppm Gain Error 110d B input differential mode rejection at 50Hz or 60Hz 0.8ppm Noise ±2%, or it can be driven by an external oscillator for a user Single Conversion Settling Time for Multiplexed defined rejection frequency. The LTC2435-1 can be con- Applications figured for better than 87d B input differential mode rejec- Internal Oscillator—No External Components tion over the range of 49Hz to 61.2Hz (50Hz and 60Hz Required ±2% simultaneously). The internal oscillator requires no Single Supply 2.7V to 5.5V Operation external frequency setting components.

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

The converters accept any external differential reference

20-Bit ADC in Narrow SSOP-16 Package

voltage from 0.1V to VCC for flexible ratiometric and

(SO-8 Footprint)

remote sensing measurement configurations. The full-

IN (p pm EF

scale differential input range is from –0.5VREF to 0.5VREF. The reference common mode voltage, VREFCM, and the

APPLICATIO

input common mode voltage, VINCM, may be indepen-

Direct Sensor Digitizer dently set anywhere within the GND to VCC range of the Weight Scales LTC2435/LTC2435-1. The DC common mode input rejec- Direct Temperature Measurement tion is better than 120d B. Gas Analyzers

The LTC2435/LTC2435-1 communicate through a flexible

Strain Gage Transducers

3-wire digital interface which is compatible with SPI and

Instrumentation

MICROWIRETM protocols.

Data Acquisition

, LTC and LT are registered trademarks of Linear Technology Corporation. Industrial Process Control No Latency ∆Σ is a trademark of Linear Technology Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. 6-Digit DVMs Protected by U.S. Patents including 6140950, 6169506.

Integral Nonlinearity vs Input

TYPICAL APPLICATIO

2.7V TO 5.5V

= INTERNAL OSC/50Hz REJECTION (LTC2435)

VCC FO = EXTERNAL CLOCK SOURCE TA = 25°C

= INTERNAL OSC/60Hz REJECTION (LTC2435)

TA = 85°C

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

REFERENCE TA = –45°C

VOLTAGE –4

0.1V TO VCC REF– FO = GND

3-WIRE –6 VCC = 5V

ANALOG INPUT RANGE SPI INTERFACE

IN+ SDO –8 VREF = 5V

–0.5VREF TO 0.5VREF VINCM = VINCM = 2.5V

IN– CS –10

2435 TA01 INPUT VOLTAGE (V)

2435 G04 24351fa