DatasheetQ Logo
Electronic component search and free download site. Transistors,MosFET ,Diode,Integrated circuits

AD592 Просмотр технического описания (PDF) - Analog Devices

Номер в каталоге
Компоненты Описание
производитель
AD592 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
AD592
To minimize the number of MUXs required when a large num-
ber of AD592s are being used, the circuit can be configured in a
matrix. That is, a decoder can be used to switch the supply volt-
age to a column of AD592s while a MUX is used to control
which row of sensors are being measured. The maximum num-
ber of AD592s which can be used is the product of the number
of channels of the decoder and MUX.
An example circuit controlling 80 AD592s is shown in Figure
16. A 7-bit digital word is all that is required to select one of
the sensors. The enable input of the multiplexer turns all the
sensors off for minimum dissipation while idling.
COLUMN
SELECT
+15V
4028 BCD TO DECIMAL DECODER
ROW
SELECT
VOUT
10k
To convert the AD592 output to °C or °F a single inexpensive
reference and op amp can be used as shown in Figure 17. Al-
though this circuit is similar to the two temperature trim circuit
shown in Figure 6, two important differences exist. First, the
gain resistor is fixed alleviating the need for an elevated tem-
perature trim. Acceptable accuracy can be achieved by choosing
an inexpensive resistor with the correct tolerance. Second, the
AD592 calibration error can be trimmed out at a known conve-
nient temperature (i.e., room temperature) with a single pot ad-
justment. This step is independent of the gain selection.
+5V
AD1403
2.5V
ROFFSET
R
RCAL
ROFFSET/RGAIN
RGAIN
AD741
ROFFSET
oC 9.1k
oF 9.8k
RGAIN
100k
180k
VOUT = 100mV/(oC OR oF)
AD592
V–
Figure 17. Celsius or Fahrenheit Thermometer
+15V
–15V
EN
80 – AD592s
Figure 16. Matrix Multiplexer
–8–
REV. B

Share Link: 

datasheetq.com  [ Privacy Policy ]Request Datasheet ] [ Contact Us ]