LTC2400CS8 datasheet(27/40 Pages) LINER

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LTC2400

TYPICAL APPLICATIONS

CS1

CS2

CS3

2400 F28

CS4

SCK

31 OR LESS

CLOCK PULSES

SDO

LTC2400

VCC

VREF

VIN

GND

SCK

SDO

SCK

SDO

CS1

CS2

CS3

CS4

LTC2400

VCC

VREF

VIN

GND

SCK

SDO

LTC2400

VCC

VREF

VIN

GND

SCK

SDO

LTC2400

VCC

VREF

VIN

GND

SCK

SDO

µCONTROLLER

EXTERNAL OSCILLATOR

(153,600HZ)

VREF

(0.1V TO VCC)

Figure 28. 4

× Output Rate LTC2400 System

Differential to Single-Ended

Analog Conditioning

The circuits in Figures 29 and 30 use the LTC1043 dual

precision, switched capacitor building block. Each circuit

uses one-half of an LTC1043 to perform a differential to

single-ended conversion over an input common mode

range that includes the power supplies. The LTC1043

samples a differential input voltage, holds it on CS and

transfers it to a ground-referenced capacitor CH. The

voltage on CH is applied to the LTC2400’s input and

converted to a digital value.

The LTC1043 achieves its best differential to single-ended

conversion when its internal switching frequency oper-

ates at a nominal 300Hz, as set by the 0.01

µF capacitor C1,

and when 1

µF capacitors are used for CS and CH. CS and

CH should be a film-type capacitor such as mylar or

polypropylene.

Simple Differential Front-End

for the LTC2400

The circuit in Figure 29 is ideal for wide dynamic range

differential signals in applications where absolute accu-

racy is secondary to high resolution, have large signal

swings, source impedances under 500

Ω and use a 5V or

±5V supply.

The circuit achieves a nonlinearity of

±35ppm (a linearity

accuracy of 14.5 bits), noise of 1.5

µVRMS and 21-bit

resolution. The circuit exhibits a typical 2.75mV zero

offset. However, this is not an offset that simply shifts the

output code by a constant value. It is a gain error that alters

the transfer function’s slope. The gain error revolves

around midscale (VREF/2). This gain error can be corrected

in software by measuring the error at 0V input and using

the result to create a correction factor.

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