Datasheet > 1221L-010

1221L-010

更新时间： 2022-12-14 18:07:28

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
7页	531K
描述
LOW NOISE ANALOG ACCELEROMETER

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1221L-010 数据手册

Model 1221 Low Noise Analog Accelerometer

,17(51$/ꢀ7(03(5$785(ꢀ6(16,1*

The model 1221 accelerometer contains a temperature

dependent current source that is output on pin 8. This signal is

useful for measuring the internal temperature of the

accelerometer so that any previously characterized bias and

scale factor temperature dependence, for a particular

accelerometer, can be corrected. The nominal output current

at 25°C is 500 A and the nominal sensitivity is 1.5 A/°C. It

is up to the user to characterize each device’s exact output

current versus temperature over the range it is to be used.

Fluctuations in V_DD& V_Rhave little effect on the temperature

reading. A reduction of 0.10 V to both V_DD& V_Rwill reduce the

current about 1 A which corresponds to less than a 1°C

change in reading.

With a single resistor R_T= 2K between I_T(pin 8) and GND, as shown in Figure 1, the output voltage V_Twill vary between

+0.76 and +1.3 volts from -55 to +125°C, which equates to a sensitivity of +3 mV/°C.

∆

V_T

(

)

V_T

≈

R_T500

1.5

(

[

−

(

)

]

R_T1.5 A

(

)

[

∆

If a greater voltage change versus temperature or

a lower signal source impedance is needed, the

circuit in Figure 2 can be used. With V_OFF= -5V,

gain resistor R_G= 15.0K and offset resistor R_OFF

7.32K, the output voltage V_Twill vary between +4.5

and +0.5 Volts from -55 to +125°C, which equates

to a sensitivity of -29 mV/°C.

V_{O F F}

(

)

V_T≈ − R_G

500

1.5

(

[

−

(

)

]

R_{O F F}

−

V_{O F F}

R_{O F F}

V_T

(

)

]

500

1.5

)

−

(

)

(

[

R_G

− ∆V_T

R_G

(

A T

∆

1.5

)

∆

V_T

= −R_G1.5µ

(

)

∆

Figure 3 shows the voltage compliance of the

temperature dependent current source (I_T) at

room temperature. The voltage at pin 8 must

be kept in the 0 to +3V range in order to

achieve proper temperature readings.

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Silicon Designs, Inc. 1445 NW Mall Street, Issaquah, WA 98027-5344

web site: www.silicondesigns.com [page 5]

Phone: 425-391-8329

Fax: 425-391-0446

Aug 05

1 2 3 456 7

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