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AD590 の電気的特性と機能

AD590のメーカーはAnalog Devicesです、この部品の機能は「Two-Terminal IC Temperature Transducer」です。


製品の詳細 ( Datasheet PDF )

部品番号 AD590
部品説明 Two-Terminal IC Temperature Transducer
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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AD590 Datasheet, AD590 PDF,ピン配置, 機能
Data Sheet
FEATURES
Linear current output: 1 μA/K
Wide temperature range: −55°C to +150°C
Probe-compatible ceramic sensor package
2-terminal device: voltage in/current out
Laser trimmed to ±0.5°C calibration accuracy (AD590M)
Excellent linearity: ±0.3°C over full range (AD590M)
Wide power supply range: 4 V to 30 V
Sensor isolation from case
Available in 2-lead FLATPACK, 4-lead LFCSP, 3-pin TO-52,
8-lead SOIC, and die form
GENERAL DESCRIPTION
The AD590 is a 2-terminal integrated circuit temperature trans-
ducer that produces an output current proportional to absolute
temperature. For supply voltages between 4 V and 30 V, the device
acts as a high impedance, constant current regulator passing
1 μA/K. Laser trimming of the chip’s thin-film resistors is used
to calibrate the device to 298.2 μA output at 298.2 K (25°C).
The AD590 should be used in any temperature-sensing
application below 150°C in which conventional electrical
temperature sensors are currently employed. The inherent
low cost of a monolithic integrated circuit combined with the
elimination of support circuitry makes the AD590 an attractive
alternative for many temperature measurement situations.
Linearization circuitry, precision voltage amplifiers, resistance
measuring circuitry, and cold junction compensation are not
needed in applying the AD590.
In addition to temperature measurement, applications include
temperature compensation or correction of discrete components,
biasing proportional to absolute temperature, flow rate measure-
ment, level detection of fluids and anemometry. The AD590 is
available in die form, making it suitable for hybrid circuits and
fast temperature measurements in protected environments.
The AD590 is particularly useful in remote sensing applications.
The device is insensitive to voltage drops over long lines due to
its high impedance current output. Any well-insulated twisted
pair is sufficient for operation at hundreds of feet from the
receiving circuitry. The output characteristics also make the
AD590 easy to multiplex: the current can be switched by a
CMOS multiplexer, or the supply voltage can be switched by a
logic gate output.
2-Terminal IC
Temperature Transducer
AD590
PIN CONFIGURATIONS
V+ 1
V– 2
AD590
TOP VIEW
(Not to Scale)
PIN 5 (EXPOSED PAD)
4 NC
3 NC
+–
Figure 1. 2-Lead
FLATPACK
NOTES
1. NC = NO CONNECT. THE NC PIN IS NOT
BONDED TO THE DIE INTERNALLY.
2. TO ENSURE CORRECT OPERATION, THE
EXPOSED PAD (EP) SHOULD BE LEFT FLOATING.
Figure 2. 4-Lead LFCSP
+
Figure 3. 3-Pin TO-52
NC 1
8 NC
V+ 2 TOP VIEW 7 NC
V– 3 (Not to Scale) 6 NC
NC 4
5 NC
NC = NO CONNECT
Figure 4. 8-Lead SOIC
PRODUCT HIGHLIGHTS
1. The AD590 is a calibrated, 2-terminal temperature sensor
requiring only a dc voltage supply (4 V to 30 V). Costly
transmitters, filters, lead wire compensation, and lineari-
zation circuits are all unnecessary in applying the device.
2. State-of-the-art laser trimming at the wafer level in
conjunction with extensive final testing ensures that
AD590 units are easily interchangeable.
3. Superior interface rejection occurs because the output is a
current rather than a voltage. In addition, power
requirements are low (1.5 mW @ 5 V @ 25°C). These
features make the AD590 easy to apply as a remote sensor.
4. The high output impedance (>10 MΩ) provides excellent
rejection of supply voltage drift. For instance, changing the
power supply from 5 V to 10 V results in only a 1 μA
maximum current change, or 1°C equivalent error.
5. The AD590 is electrically durable: it withstands a forward
voltage of up to 44 V and a reverse voltage of 20 V.
Therefore, supply irregularities or pin reversal does not
damage the device.
Rev. G
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com

1 Page





AD590 pdf, ピン配列
Data Sheet
AD590
SPECIFICATIONS
AD590J AND AD590K SPECIFICATIONS
25°C and VS = 5 V, unless otherwise noted.1
Table 1.
Parameter
POWER SUPPLY
Operating Voltage Range
OUTPUT
Nominal Current Output @ 25°C (298.2 K)
Nominal Temperature Coefficient
Calibration Error @ 25°C
Absolute Error (Over Rated Performance Temperature Range)
Without External Calibration Adjustment
With 25°C Calibration Error Set to Zero
Nonlinearity
For TO-52 and FLATPACK Packages
For 8-Lead SOIC Package
For 4-Lead LFCSP Package
Repeatability3
Long-Term Drift4
Current Noise
Power Supply Rejection
4 V ≤ VS ≤ 5 V
5 V ≤ VS ≤ 15 V
15 V ≤ VS ≤ 30 V
Case Isolation to Either Lead
Effective Shunt Capacitance
Electrical Turn-On Time
Reverse Bias Leakage Current (Reverse Voltage = 10 V)5
AD590J2
Min Typ Max
AD590K
Min Typ
Max
Unit
4 30 4 30 V
298.2
1
±5.0
298.2
µA
1 µA/K
±2.5 °C
±10 ±5.5 °C
±3.0 ±2.0 °C
±1.5
±1.5
±1.5
±0.1
±0.1
40
±0.8 °C
±1.0 °C
°C
±0.1 °C
±0.1 °C
40 pA/Hz
0.5 0.5 µA/V
0.2 0.2 µV/V
0.1 0.1 µA/V
1010
1010
Ω
100 100 pF
20 20 µs
10 10 pA
1 Specifications shown in boldface are tested on all production units at final electrical test. Results fromthose tests are used to calculate outgoing quality levels. All
minimum and maximum specifications are guaranteed, although only those shown in boldfaceare tested on all production units.
2 The LFCSP package has a reduced operating temperature range of −40°C to +125°C.
3 Maximum deviation between +25°C readings after temperature cycling between −55°C and +150°C; guaranteed, not tested.
4 Conditions: constant 5 V, constant 125°C; guaranteed, not tested.
5 Leakage current doubles every 10°C.
Rev. G | Page 3 of 16


3Pages


AD590 電子部品, 半導体
AD590
PRODUCT DESCRIPTION
The AD590 is a 2-terminal temperature-to-voltage transducer. It
is available in a variety of accuracy grades and packages. When
using the AD590 in die form, the chip substrate must be kept
electrically isolated (floating) for correct circuit operation.
1725µM
V–
1090µM
V+
Figure 6. Metallization Diagram
The AD590 uses a fundamental property of the silicon
transistors from which it is made to realize its temperature
proportional characteristic: if two identical transistors are
operated at a constant ratio of collector current densities, r,
then the difference in their base-emitter voltage is (kT/q)(In r).
Because both k (Boltzman’s constant) and q (the charge of an
electron) are constant, the resulting voltage is directly pro-
portional to absolute temperature (PTAT). (For a more detailed
description, see M.P. Timko, “A Two-Terminal IC Temperature
Transducer,” IEEE J. Solid State Circuits, Vol. SC-11, p. 784-788,
Dec. 1976. Understanding the Specifications–AD590.)
In the AD590, this PTAT voltage is converted to a PTAT current
by low temperature coefficient thin-film resistors. The total
current of the device is then forced to be a multiple of this
PTAT current. Figure 7 is the schematic diagram of the AD590.
In this figure, Q8 and Q11 are the transistors that produce the
PTAT voltage. R5 and R6 convert the voltage to current. Q10,
whose collector current tracks the collector currents in Q9 and
Q11, supplies all the bias and substrate leakage current for the
rest of the circuit, forcing the total current to be PTAT. R5 and
R6 are laser-trimmed on the wafer to calibrate the device at 25°C.
Data Sheet
Figure 8 shows the typical V–I characteristic of the circuit at
25°C and the temperature extremes.
+
R1 R2
2601040
Q2 Q5 Q3
Q1 Q4
C1
Q6 26pF
Q7 Q12
Q8
CHIP
SUBSTRATE
Q9
R4
R3 11k
5k
Q10
Q11
8
R6
820
R5 1
146
1
Figure 7. Schematic Diagram
+150°C
423
+25°C
298
–55°C
218
012 3456
SUPPLY VOLTAGE (V)
Figure 8. V–I Plot
30
Rev. G | Page 6 of 16

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