AD592BN Analog Devices Inc, AD592BN Datasheet - Page 8

• Manufacturer Part Number: AD592BN
• Description: IC TEMP TRANSDUCER 2-TERM TO92-3
• Manufacturer: Analog Devices Inc

Specifications of AD592BN

• Rohs Status: RoHS non-compliant
• Sensing Temperature: -25°C ~ 105°C
• Output Type: Current
• Voltage - Supply: 4 V ~ 30 V
• Accuracy: ±0.7°C
• Package / Case: TO-226-3, TO-92-3 (TO-226AA)
• Peak Reflow Compatible (260 C): No
• Ic Function: Temperature Sensor IC
• Termination Type: Through Hole
• Leaded Process Compatible: No
• Mounting Type: Through Hole
• Operating Temperature Range: -25°C To +105°C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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.
+15V
4028 BCD TO DECIMAL DECODER
Figure 16. Matrix Multiplexer
80 – AD592s
COLUMN
SELECT
Dimensions shown in inches and (mm).
SEATING
SELECT
ROW
PLANE
0.105 (2.66)
0.080 (2.42)
OUTLINE DIMENSIONS
0.105 (2.66)
0.080 (2.42)
E
0.105 (2.66)
0.095 (2.42)
N
(3.43)
0.135
MIN
(12.70)
+15V
–15V
0.500
MIN
V
10k
OUT
BOTTOM VIEW
1
–8–
2
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.
AD1403
3
0.055 (1.39)
0.045 (1.15)
0.210 (5.33)
0.170 (4.32)
0.165 (4.19)
0.125 (3.94)
0.019 (0.482)
0.016 (0.407)
0.205 (5.20)
0.175 (4.96)
Figure 17. Celsius or Fahrenheit Thermometer
SQUARE
0.050
(1.27)
MAX
+5V
2.5V
R
OFFSET
R
R
OFFSET
/R
GAIN
R
CAL
V–
AD592
R
GAIN
AD741
V
OUT
= 100mV/(
o
o
C
F
R
o
C OR
OFFSET
9.1k
9.8k
o
F)
REV. A
R
100k
180k
GAIN