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产品型号AD22284-A-R2的概述

芯片AD22284-A-R2 的概述 AD22284-A-R2 是一款由Analog Devices Inc.（简称ADI）生产的高性能模拟前端（AFE）芯片，主要用于多通道数据采集和不同类型的信号处理。这款芯片广泛应用于工业自动化、医疗设备、传感器接口以及通信系统中，因其出色的性能和灵活的功能而受到工程师的青睐。 AD22284-A-R2 提供了高精度的信号转换能力，支持多种输入信号类型，包括电压和电流信号，适合于需要高准确度和低噪声操作的应用场景。它的设计确保了较大的动态范围和快速的采样速率，这使得该芯片特别适合用于快速变化信号的检测和处理。芯片AD22284-A-R2 的详细参数 AD22284-A-R2的主要参数如下： 1. 输入电压范围：±10V或0-10V，基于应用需求进行选择。 2. 分辨率：16位，提供出色的精度和细致的数据捕获。 3. 采样速率：最高可达1MSPS（...

产品型号AD22284-A-R2的Datasheet PDF文件预览

Dual-Axis, High-g,

iMEMS^®Accelerometers

ADXL278

FEATURES

GENERAL DESCRIPTION

Complete dual-axis acceleration measurement system on

a single monolithic IC

Available in 35 g/ 35 g, 50 g/ 50 g, or 70 g/ 35 g

output full-scale ranges

Full differential sensor and circuitry for high resistance

to EMI/RFI

Environmentally robust packaging

Complete mechanical and electrical self-test on

digital command

The ADXL278 is a low power, complete, dual-axis

accelerometer with signal conditioned voltage outputs that are

on a single monolithic IC. This product measures acceleration

with a full-scale range of (X-axis/Y-axis) ±±3 g/±±3 g, ±35 g/

±35 g, or ±75 g/±±3 g (minimum). The ADXL278 can also

measure both dynamic acceleration (vibration) and static

acceleration (gravity).

The ADXL278 is the fourth-generation surface micromachined

iMEMS® accelerometer from ADI with enhanced performance

and lower cost. Designed for use in front and side impact airbag

applications, this product also provides a complete cost-

Output ratiometric to supply

Sensitive axes in the plane of the chip

High linearity (0.2% of full scale)

Frequency response down to dc

Low noise

effective solution useful for a wide variety of other applications.

The ADXL278 is temperature stable and accurate over the

automotive temperature range, with a self-test feature that fully

exercises all the mechanical and electrical elements of the sensor

with a digital signal applied to a single pin.

Low power consumption

Tight sensitivity tolerance and 0 g offset capability

Largest available prefilter clipping headroom

400 Hz, 2-pole Bessel filter

Single-supply operation

Compatible with Sn/Pb and Pb-free solder processes

The ADXL278 is available in a 3 mm × 3 mm × 2 mm,

8-terminal ceramic LCC package.

APPLICATIONS

Vibration monitoring and control

Vehicle collision sensing

Shock detection

FUNCTIONAL BLOCK DIAGRAM

ADXL278

400Hz

BESSEL

FILTER

DIFFERENTIAL

SENSOR

DEMOD

AMP

EXC

OUT

TIMING

GENERATOR

DD2

DD3

400Hz

BESSEL

FILTER

DIFFERENTIAL

SENSOR

DEMOD

AMP

EXC

OUT

SELF-TEST

Figure 1.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

ADXL278

TABLE OF CONTENTS

Specifications..................................................................................... ±

Power Supply Decoupling ............................................................8

Self-Test ..........................................................................................8

Clock Frequency Supply Response .............................................8

Signal Distortion ...........................................................................8

Outline Dimensions..........................................................................9

Ordering Guide .............................................................................9

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 3

Theory of Operation ........................................................................ 7

Applications....................................................................................... 8

REVISION HISTORY

5/05—Rev. 0 to Rev. A

Rev. A | Page 2 of 12

ADXL278

SPECIFICATIONS¹

At T_A= −45°C to +153°C, 3.5 V dc ± 3ꢀ, acceleration = 5 g, unless otherwise noted.

Table 1.

Model No. AD22284 Model No. AD22285

Model No. AD22286

Axis Min Typ Max

Parameter

Conditions

Min

Typ Max

Min

Typ Max

Unit

SENSOR

Output Full-Scale Range

I_OUT≤ 1ꢀꢀ ꢁA

7ꢀ

Nonlinearity

Package Alignment Error

Sensor-to-Sensor

Alignment Error

ꢀ.2

ꢀ.1

ꢀ.2

ꢀ.1

ꢀ.2

ꢀ.1

Degree

Cross-Axis Sensitivity

Resonant Frequency

Sensitivity, Ratiometric

(Over Temperature)

−5

kHz

V_DD= 5 V,

1ꢀꢀ Hz

52.25 55

57.75 36.1

39.9

25.65 27

28.35 mV/g

52.25 55

57.75 mV/g

OFFSET

Zero-g Output Voltage

V_OUT− V_DD/2,

V_DD= 5 V

−15ꢀ

+15ꢀ

−15ꢀ

+15ꢀ

−1ꢀꢀ

−15ꢀ

+1ꢀꢀ mV

+15ꢀ mV

(Over Temperature)²

NOISE

Noise Density

1ꢀ Hz − 4ꢀꢀ Hz,

5 V

1.1

1.4

1.8

3.5

mg/√Hz

1.1

mg/√Hz

Clock Noise

mV p-p

FREQUENCY RESPONSE

−3 dB Frequency

−3 dB Frequency Drift

2-pole Bessel

36ꢀ

44ꢀ

4ꢀꢀ 44ꢀ

36ꢀ

3ꢀ4

4ꢀꢀ

44ꢀ

456

36ꢀ

216

4ꢀꢀ 44ꢀ

25°C to

T_MINor T_MAX

SELF-TEST

Output Change

(Cube vs. V_DD)³

V_DD= 5 V

55ꢀ 66ꢀ

38ꢀ

5ꢀ

27ꢀ 324

55ꢀ 66ꢀ

44ꢀ

3.5

Logic Input High

Logic Input Low

Input Resistance

V_DD= 5 V

Pull-down

3.5

3ꢀ

3.5

3ꢀ

5ꢀ

3ꢀ

5ꢀ

kΩ

resistor to GND

OUTPUT AMPLIFIER

Output Voltage Swing

I_OUT= 4ꢀꢀ ꢁA ꢀ.25

1ꢀꢀꢀ

V_DD

ꢀ.25

−

ꢀ.25

V_DD

ꢀ.25

−

ꢀ.25

V_DD

ꢀ.25

−

Capacitive Load Drive

PREFILTER HEADROOM

CFSR @ 4ꢀꢀ kHz

1ꢀꢀꢀ

28ꢀ

4ꢀꢀ

4.5

56ꢀ

V/V

POWER SUPPLY (V_DD)

Functional Range

4.75

3.5

5.25

4.75

3.5

5.25

4.75

3.5

5.25

Quiescent Supply Current

TEMPERATURE RANGE

V_DD= 5 V

2.2

2.9

2.2

2.9

2.2

2.9

−4ꢀ

+1ꢀ5

−4ꢀ

+1ꢀ5

−4ꢀ

+1ꢀ5 °C

¹All minimum and maximum specifications are guaranteed. Typical specifications are not guaranteed.

²Zero g output is ratiometric.

³Self-test output at V_DD= (Self-Test Output at 5 V) × (V_DD/5 V)³.

Rev. A | Page 3 of 12

ADXL278

ABSOLUTE MAXIMUM RATINGS

Table 2.

Stresses above those listed under Absolute Maximum Ratings

may cause permanent damage to the device. This is a stress

rating only; functional operation of the device at these or any

other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect

device reliability.

Parameter

Rating

Acceleration (Any Axis, Unpowered)

Acceleration (Any Axis, Powered)

V_S

4,ꢀꢀꢀ g

−ꢀ.3 V to +7.ꢀ V

(COM − ꢀ.3 V) to

(V_S+ ꢀ.3 V)

All Other Pins

Output Short-Circuit Duration

(Any Pin to Common)

Indefinite

Operating Temperature Range

Storage Temperature

−65°C to +15ꢀ°C

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4ꢀꢀꢀ V readily accumulate on the

human body and test equipment and can discharge without detection. Although this product features

proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy

electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance

degradation or loss of functionality.

Rev. A | Page 4 of 12

ADXL278

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

DD2

DD3

ADXL278

OUT

TOP VIEW

(Not to Scale)

COM

NC = NO CONNECT

Figure 2. Pin Configuration

Table 3. Pin Function Descriptions

Pin No.

Mnemonic

Description

V_DD3

Y_OUT

COM

X_OUT

V_DD

3.5 V to 6 V

Y Channel Output

Common

Self-Test

Do Not Connect

X Channel Output

3.5 V to 6 V

V_DD2

3.5 V to 6 V

Rev. A | Page 5 of 12

ADXL278

CRITICAL ZONE

TO T

t_P

RAMP-UP

t_L

SMAX

SMIN

t_S

RAMP-DOWN

PREHEAT

t25°C TO PEAK

TIME

Figure 3. Recommended Soldering Profile

Table 4. Recommended Soldering Profile

Profile Feature

Sn63/Pb37

Pb-Free

AVERAGE RAMP RATE (T_LTO T_P)

PREHEAT

3°C/s max

Minimum Temperature (T_SMIN

)

1ꢀꢀ°C

15ꢀ°C

Maximum Temperature (T_SMAX

TIME (T_SMINTO T_SMAX), t_S

T_SMAXTO T_L

)

15ꢀ°C

2ꢀꢀ°C

6ꢀ s − 12ꢀ s

6ꢀ s − 15ꢀ s

Ramp-Up Rate

3°C/s

TIME MAINTAINED ABOVE LIQUIDOUS (T_L)

Liquidous Temperature (T_L)

Time (t_L)

183°C

6ꢀ s − 15ꢀ s

217°C

6ꢀ s − 15ꢀ s

26ꢀ°C + ꢀ°C/−5°C

2ꢀ s − 4ꢀ s

6°C/s max

8 min max

PEAK TEMPERATURE (T_P)

24ꢀ°C + ꢀ°C/−5°C

1ꢀ s − 3ꢀ s

TIME WITHIN 5°C OF ACTUAL PEAK TEMPERATURE (t_P)

RAMP-DOWN RATE

6°C/s max

TIME 25°C TO PEAK TEMPERATURE

6 min max

PIN 8

XXXXX

XXXX

= 2.462V

OUT

= 2.500V

22285

= 2.500V

= 2.538V

= 2.500V

= 2.462V

OUT

2 2 2 8 5

= 2.538V

= 2.500V

OUT

X X X X

X X X X X

OUT

= 2.500V

OUT

EARTH'S SURFACE

Figure 4. Output Response vs. Orientation

Rev. A | Page 6 of 12

ADXL278

THEORY OF OPERATION

The ADXL278 provides a fully differential sensor structure and

circuit path, resulting in the industry’s highest resistance to

EMI/RFI effects. This latest generation uses electrical feedback

with zero-force feedback for improved accuracy and stability.

The sensor resonant frequency is significantly higher than the

signal bandwidth set by the on-chip filter, avoiding the signal

analysis problems caused by resonant peaks near the signal

bandwidth.

ANCHOR

MOVABLE

FRAME

PLATE

CAPACITORS

UNIT

SENSING

CELL

FIXED

PLATES

UNIT

FORCING

CELL

MOVING

PLATE

Figure 3 is a simplified view of one of the differential sensor

elements. Each sensor includes several differential capacitor

unit cells. Each cell is composed of fixed plates attached

to the substrate and movable plates attached to the frame.

Displacement of the frame changes the differential capacitance,

which is measured by the on-chip circuitry.

ANCHOR

Figure 5. Simplified View of Sensor Under Acceleration

Complementary 255 kHz square waves drive the fixed plates.

Electrical feedback adjusts the amplitudes of the square waves

such that the ac signal on the moving plates is 5. The feedback

signal is linearly proportional to the applied acceleration. This

unique feedback technique ensures that there is no net

electrostatic force applied to the sensor. The differential

feedback control signal is also applied to the input of the filter,

where it is filtered and converted to a single-ended signal.

Rev. A | Page 7 of 12

ADXL278

APPLICATIONS

POWER SUPPLY DECOUPLING

155 Hz. If the power supply clock is at exactly the same frequency

as the accelerometer clock, the term appears as an offset.

For most applications, a single 5.1 μF capacitor, C_DC, adequately

decouples the accelerometer from noise on the power supply.

However, in some cases, particularly where noise is present at

the 255 kHz internal clock frequency (or any harmonic

thereof), noise on the supply can cause interference on the

ADXL278’s output. If additional decoupling is needed, a 35 Ω

(or smaller) resistor or ferrite bead cany be inserted in the

supply line. Additionally, a larger bulk bypass capacitor (in the

If the difference frequency is outside of the signal bandwidth,

the filter attenuates it. However, both the power supply clock

and the accelerometer clock may vary with time or temperature,

which can cause the interference signal to appear in the output

filter bandwidth.

The ADXL278 addresses this issue in two ways. First, the high

clock frequency eases the task of choosing a power supply clock

frequency such that the difference between it and the accelero-

meter clock remains well outside of the filter bandwidth.

Second, the ADXL278 is the only micromachined accelerometer

to have a fully differential signal path, including differential

sensors. The differential sensors eliminate most of the power

supply noise before it reaches the demodulator. Good high

frequency supply bypassing, such as a ceramic capacitor close to

the supply pins, also minimizes the amount of interference.

1 μF to 4.7 μF range) can be added in parallel to C_DC

SELF-TEST

The fixed fingers in the forcing cells are normally kept at the

same potential as that of the movable frame. When the self-test

digital input is activated, the voltage on the fixed fingers on one

side of the moving plate in the forcing cells is changed. This

creates an attractive electrostatic force, which causes the frame

to move towards those fixed fingers. The entire signal channel is

active; therefore, the sensor displacement causes a change in

The clock frequency supply response (CFSR) is the ratio of the

response at V_OUTto the noise on the power supply near the

accelerometer clock frequency. A CFSR of ± means that the

signal at V_OUTis ±× the amplitude of an excitation signal at V_DD

near the accelerometer internal clock frequency. This is

analogous to the power supply response, except that the

stimulus and the response are at different frequencies. The

ADXL278’s CFSR is 15× better than a typical single-ended

accelerometer system.

V_OUT. The ADXL278’s self-test function is a comprehensive

method of verifying the operation of the accelerometer.

Because electrostatic force is independent of the polarity of the

voltage across capacitor plates, a positive voltage is applied in

half of the forcing cells, and its complement in the other half of

the forcing cells. Activating self-test causes a step function force

to be applied to the sensor, while the capacitive coupling term is

canceled. The ADXL278 has improved self-test functionality,

including excellent transient response and high speed switching

capabilities. Arbitrary force waveforms can be applied to the

sensor by modulating the self-test input, such as test signals to

measure the system frequency response or even crash signals to

verify algorithms within the limits of the self-test swing.

SIGNAL DISTORTION

Signals from crashes and other events may contain high

amplitude, high frequency components. These components

contain very little useful information and are reduced by the

2-pole Bessel filter at the output of the accelerometer. However,

if the signal saturates at any point, the accelerometer output

does not look like a filtered version of the acceleration signal.

The ST pin should never be exposed to voltages greater than

V_S+ 5.± V. If this cannot be guaranteed due to the system

design (for instance, if there are multiple supply voltages), then

a low V_Fclamping diode between ST and V_Sis recommended.

The signal may saturate anywhere before the filter. For example,

if the resonant frequency of the sensor is low, the displacement

per unit acceleration is high. The sensor may reach the

mechanical limit of travel if the applied acceleration is high

enough. This can be remedied by locating the accelerometer

where it does not see high values of acceleration and by using a

higher resonant frequency sensor, such as the ADXL278.

CLOCK FREQUENCY SUPPLY RESPONSE

In any clocked system, power supply noise near the clock

frequency may have consequences at other frequencies. An

internal clock typically controls the sensor excitation and the

signal demodulator for micromachined accelerometers.

Also, the electronics may saturate in an overload condition

between the sensor output and the filter input. Ensuring that

internal circuit nodes operate linearly to at least several times

the full-scale acceleration value can minimize electrical

saturation. The ADXL278 circuit is linear to approximately 8×

full scale.

If the power supply contains high frequency spikes, they may be

demodulated and interpreted as an acceleration signal. A signal

appears as the difference between the noise frequency and the

demodulator frequency. If the power supply spikes are 155 Hz

away from the demodulator clock, there is an output term at

Rev. A | Page 8 of 12

ADXL278

OUTLINE DIMENSIONS

1.27

5.00

0.50 DIAMETER

1.78

1.27

1.90

2.50

4.50

TOP VIEW

R 0.38

0.64

2.50

1.27

0.20

0.38 DIAMETER

BOTTOM VIEW

R 0.20

Figure 6. 8-Terminal Ceramic Leadless Chip Carrier [LCC]

(E-8)

Dimensions shown in millimeters

AXL278 ORDERING GUIDE

Parts

Measurement

Range

Specified

Voltage (V)

Temperature

Range

Package

Option

Model¹

per Reel

Package Description

AD22284-A-R2

AD22284-A

AD22285-R2

AD22285

AD22286-R2

AD22286

25ꢀ

3ꢀꢀꢀ

25ꢀ

3ꢀꢀꢀ

25ꢀ

3ꢀꢀꢀ

35 g/ 35 g

5ꢀ g/ 5ꢀ g

7ꢀ g/ 35 g

−4ꢀ°C to +1ꢀ5°C

8-Lead Ceramic Leadless Chip Carrier

E-8

¹All models are on tape and reel and are Pb-free parts.

Rev. A | Page 9 of 12

ADXL278

NOTES

Rev. A | Page 1ꢀ of 12

ADXL278

NOTES

Rev. A | Page 11 of 12

ADXL278

NOTES

registered trademarks are the property of their respective owners.

D05365–0–5/05(A)

Rev. A | Page 12 of 12

AD22284-A-R2相关文章

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AD22284-A-R2产品参数

型号:	AD22284-A-R2
Brand Name：	Analog Devices Inc
是否无铅：	含铅
是否Rohs认证：	符合
生命周期：	Obsolete
IHS 制造商：	ANALOG DEVICES INC
零件包装代码：	LCC
包装说明：	LCC-8
针数：	8
制造商包装代码：	E-8-1
Reach Compliance Code：	not_compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	8.55
模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	S-CQCC-N8
长度：	5 mm
功能数量：	2
端子数量：	8
最高工作温度：	105 °C
最低工作温度：	-40 °C
封装主体材料：	CERAMIC, METAL-SEALED COFIRED
封装代码：	QCCN
封装等效代码：	LCC8,.2SQ
封装形状：	SQUARE
封装形式：	CHIP CARRIER
峰值回流温度（摄氏度）：	260
电源：	5 V
认证状态：	Not Qualified
座面最大高度：	2.2 mm
子类别：	Other Analog ICs
最大供电电压 (Vsup)：	5.25 V
最小供电电压 (Vsup)：	4.75 V
标称供电电压 (Vsup)：	5 V
表面贴装：	YES
温度等级：	INDUSTRIAL
端子面层：	Tungsten/Nickel/Gold (W/Ni/Au)
端子形式：	NO LEAD
端子节距：	1.27 mm
端子位置：	QUAD
处于峰值回流温度下的最长时间：	40
宽度：	5 mm
Base Number Matches：	1

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