3.7
ΣΔ Converter
A sigma delta converter provides the interface between the transducer and the DSP. The output of the ΣΔ converter is a data
stream at a nominal frequency of 1 MHz.
g-CELL
C TOP
C BOT
α 1 =
V X
C INT1
FIRST
INTEGRATOR
z -1
1 - z -1
α 2
SECOND
INTEGRATOR
z -1
1 - z -1
1-BIT
QUANTIZER
ΣΔ _OUT
ADC
Δ C = C TOP - C BOT
β 1
β 2
V = Δ C x V X / C INT1
V = ± 2 × V REF
Figure 11. ΣΔ Converter Block Diagram
DAC
3.8
Digital Signal Processing Block
A digital signal processing (DSP) block is used to perform signal filtering and compensation operations. A diagram illustrating
the signal processing flow is shown in Figure 12 .
Arm/PCM Output
Section 3.8.9
I
To ARM_x
ΣΔ _OUT
A
SINC Filter
B
Low Pass Filter
C Compensation D
Interpolation
E
Offset Cancellation
F
Offset Cancellation
G
Section 3.8.10
To SPI
Section 3.8.2
Section 3.8.3
Section 3.8.6
Section 3.8.7
Section 3.8.4
Output Scaling
Table 26. Signal Chain Characteristics
Figure 12. Signal Chain Diagram
Raw Output
Scaling
H
To SPI
Description
Sample
Time ( μ s)
Data Width Over Range
Bits Bits
Effective
Bits
Rounding
Resolution Bits
Typical Block
Latency
Reference
A
B
SD
SINC Filter
1
8
1
14
1
13
3.2 μ s
11.2 μ s
Section 3.7
Section 3.8.2
C
D
E
F
Low Pass Filter
Compensation
Interpolation
Offset
Cancellation
8/16
8/16
4/8
256
20
20
20
20
4
4
4
4
12
12
12
12
4
4
4
4
Reference
Section 3.8.3
7.875 μ s
t s / 2
N/A
Section 3.8.3
Section 3.8.6
Section 3.8.8
Section 3.8.4
GH
I
SPI Output
PCM Output
4/8
4/8
12
9
t s / 2
Section 3.8.11
MMA65xx
Sensor
Freescale Semiconductor, Inc.
25
相关PDF资料
MMA6556KW IC ACCELEROMETER X AXIS 16QFN
MMA6826AKW IC ACCELEROMETER XY AXIS 16QFN
MMA6854KW IC ACCELEROMETER X AXIS 16QFN
MMA7331LR2 ACCELEROMETER 4G XYZ ENH 14-LGA
MMA8451QT IC ACCELEROMETER 3AXIS 16QFN
MMA8452QR1 IC ACCELER 2G/4G/8G 3AXIS 16QFN
MMA8453QR1 IC ACCELER 2G/4G/8G 3AXIS 16QFN
MMBF0201NLT1 MOSFET N-CH 20V 300MA SOT-23
相关代理商/技术参数
MMA6527KWR2 功能描述:加速计 - 板上安装 XY-AXIS 120/ 120G RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA6555KW 功能描述:加速计 - 板上安装 X-AXIS 100G RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA6555KWR2 功能描述:加速计 - 板上安装 X-AXIS 100G RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA6556KW 功能描述:加速计 - 板上安装 X-AXIS 120G RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA6556KWR2 功能描述:加速计 - 板上安装 X-AXIS 120G RoHS:否 制造商:Murata 传感轴:Double 加速:12 g 灵敏度: 封装 / 箱体: 输出类型:Analog 数字输出 - 位数:11 bit 电源电压-最大:5.25 V 电源电压-最小:4.75 V 电源电流:4 mA 最大工作温度:+ 125 C 最小工作温度:- 40 C
MMA65XX 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Dual-Axis SPI Inertial Sensor
MMA6700AEGR2 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High Accuracy Low g Inertial Sensor MEMS Sensing, State Machine ASIC
MMA6700EG 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High Accuracy Low g Inertial Sensor MEMS Sensing, State Machine ASIC