Rainbow-electronics MAX1495 Manual do Utilizador descarregar pdf (Página 21)

MAX1491/MAX1493/MAX1495

3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

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Typical Operating Circuit

MAX1493

MAX1495

(MAX1491)

0.1µF 4.7µF

0.1µF

4.7µF

10µF

ISO

LOW

2.7V TO

5.25V

AIN+

AIN-

LOWBATT V

NEG

GND REF- REF+

RANGE

INTREF

PEAK

DPON

DPSET1

HOLD

DPSET2

BACKPLANE

CONNECTIONS

SEG1–SEG13

(SEG1–SEG10)

HOLD PEAK LOW BATTERY

Gain Error

Gain error is the amount of deviation between the mea-

sured full-scale transition point and the ideal full-scale

transition point.

Common-Mode Rejection

Common-mode rejection is the ability of a device to

reject a signal that is common to both input terminals.

The common-mode signal can be either an AC or a DC

signal or a combination of the two. CMR is often

expressed in decibels.

Normal-Mode 50Hz and 60Hz Rejection

(Simultaneously)

Normal mode rejection is a measure of how much output

changes when 50Hz and 60Hz signals are injected into

just one of the differential inputs. The MAX1491/

MAX1493/MAX1495 sigma-delta converter uses its inter-

nal digital filter to provide normal mode rejection to both

50Hz and 60Hz power-line frequencies simultaneously.

Power-Supply Rejection Ratio

Power-supply rejection ratio (PSRR) is the ratio of the

input supply change (in volts) to the change in the con-

verter output (in volts). It is measured typically

in decibels.

Enhanced Offset Calibration

Enhanced offset calibration is a more accurate calibra-

tion method that is needed in the case of the ±200mV

range and 4.5-digit resolution. The MAX1493/MAX1495

perform the enhanced offset calibration upon power-up.

The MAX1495 also performs enhanced offset calibration

on demand with the HOLD input.

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