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Chapter 10 Analog Front End
10.1
Introduction
The Analog Front End (AFE) includes the accelerometer, signal conditioning blocks, off-chip analog
inputs, analog multiplexor and an analog-to-digital converter and control logic. In short, the AFE is
responsible for converting analog sensor measurements into digital form suitable for subsequent filtering
and digital-signal processing.
10.2
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Features
Up to 3906 conversion frames per second support for a 3906-Hz output data rate
(A higher data rate is available with the MMA9559L device.)
120 ? g/sqrt (Hz) noise at nominal ODR = 488 Hz
Programmable configuration for ADC conversions on a per-frame basis
— No conversions (non-sample frame)
— X, Y and Z acceleration
— X, Y and Z acceleration plus temperature sensor reading
— X, Y and Z acceleration plus external ADC input
Multiple modes of operation allow trade-off of power/latency versus ADC resolution and accuracy
— Target raw resolution selectable to 10, 12, 14 and 16 bits
Programmable acceleration ranges: 2g, 4g and 8g full scale
Programmable accelerometer anti-aliasing filters
Integrated temperature sensor: -50 °C to 150 °C full scale 1
External differential ADC input range: 0.65V ± 0.45V
1. The temperature sensor is designed for a 200 °C, full-scale range. This does not imply that the device is intended to operate
over this entire range. This device is guaranteed to operate over the commercial (–40 to 85 ° C) temperature range.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
181
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