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PDF AD590 Data sheet ( Hoja de datos )
| Número de pieza | AD590 | |
| Descripción | Two-Terminal IC Temperature Transducer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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 1. - Current Output Temperature Transducer  Hay una vista previa y un enlace de descarga de AD590 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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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  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Forward Voltage ( E+ or E−)
Reverse Voltage (E+ to E−)
Breakdown Voltage (Case E+ or E−)
Rated Performance Temperature Range1
Storage Temperature Range1
Lead Temperature (Soldering, 10 sec)
Rating
44 V
−20 V
±200 V
−55°C to +150°C
−65°C to +155°C
300°C
1 The AD590 was used at −100°C and +200°C for short periods of
measurement with no physical damage to the device. However, the absolute
errors specified apply to only the rated performance temperature range.
Applicable to 2-lead FLATPACK and 3-pin TO-52 packages only.
AD590
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and 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.
ESD CAUTION
Rev. G | Page 5 of 16
5 Page 
Data Sheet
Figure 21 is an example of a current transmitter designed to be
used with 40 V, 1 kΩ systems; it uses its full current range of 4
to 20 mA for a narrow span of measured temperatures. In this
example, the 1 µA/K output of the AD590 is amplified to
1 mA/°C and offset so that 4 mA is equivalent to 17°C and
20 mA is equivalent to 33°C. RT is trimmed for proper reading
at an intermediate reference temperature. With a suitable choice
of resistors, any temperature range within the operating limits
of the AD590 can be chosen.
V+
4mA = 17°C
12mA = 25°C
20mA = 33°C
+ AD581
– VOUT
35.7kΩ
+
AD590
–
RT
5kΩ
0.01µF
10kΩ
12.7kΩ
10Ω
30pF
–
OP177
+ 5kΩ 500Ω
V–
Figure 21. 4 to 20 mA Current Transmitter
Figure 22 is an example of a variable temperature control circuit
(thermostat) using the AD590. RH and RL are selected to set the
high and low limits for RSET. RSET could be a simple pot, a
calibrated multiturn pot, or a switched resistive divider. Powering
the AD590 from the 10 V reference isolates the AD590 from
supply variations while maintaining a reasonable voltage (~7 V)
across it. Capacitor C1 is often needed to filter extraneous noise
from remote sensors. RB is determined by the β of the power
transistor and the current requirements of the load.
AD590
V+
V+
AD581
OUT
10V
V– +
RH AD590
RB
RSET
– 2– 7
AD790
RL
3+ 4
1
C1 10kΩ
HEATING
ELEMENTS
GND
Figure 22. Simple Temperature Control Circuit
The voltage compliance and the reverse blocking characteristic
of the AD590 allow it to be powered directly from 5 V CMOS
logic. This permits easy multiplexing, switching, or pulsing for
minimum internal heat dissipation. In Figure 23, any AD590
connected to a logic high passes a signal current through the
current measuring circuitry, while those connected to a logic
zero pass insignificant current. The outputs used to drive the
AD590s can be employed for other purposes, but the additional
capacitance due to the AD590 should be taken into account.
5V
CMOS
GATES
+
AD590
+–
+–
+–
–
1kΩ (0.1%)
Figure 23. AD590 Driven from CMOS Logic
Rev. G | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD590.PDF ] | |
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