Rainbow-electronics MAXQ3120 Manual do Utilizador descarregar pdf (Página 30)

+Denotes a Pb-free/RoHS-compliant device.

MAXQ3120

Filter Results

Below is the summary of the SNR and THD values

before and after applying the above LPFs, for 60

MAXQ3120 units.

An application engineer can easily implement his own

favorite lowpass filters to optimize MAXQ3120 for his

target applications. However, he does need to consider

the filter complexity and its processor resource require-

ment (CPU cycles and storage space) to strike an opti-

mal balance. The above 23-tap LPF takes 23 x 2 bytes

of RAM and 107 clock cycles of the MAXQ3120 to com-

plete. Note that the number of cycles varies from filter

to filter because the number of shifts required to nor-

malize the multiply-accumulate result will vary.

High-Precision ADC

Mixed-Signal Microcontroller

30 ____________________________________________________________________

SNR THD

CONDITION

MIN AVG MAX MIN AVG MAX

Before LPF 56.5 56.8 57.1 -84.5 -81.1 -77.3

After LPF, 21st Harmonic 68.2 70.7 71.4 -85.8 -83.1 -79.4

After LPF, 7th

Harmonic 71.5 73.8 74.7 -88.9 -85.7 -82.0

Selector Guide

PART

TEMP RANGE

PROGRAM

MEMORY

DATA

MEMORY

LCD

SEGMENTS

EXTERNAL

INTERRUPTS

USARTS

PIN-

PACKAGE

MAXQ3120-FFN

-40°C to +85°C 16kWord Flash 256 Word SRAM

112 3 2 80 MQFP

MAXQ3120-FFN+

-40°C to +85°C 16kWord Flash 256 Word SRAM

112 3 2 80 MQFP

1 2 ... 25 26 27 28 29 30 31 32 33

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