Analog Devices AD22103KT, AD22103KR, AD22103KCHIPS Datasheet

a		3.3 V Supply, Voltage Output Temperature
		Sensor with Signal Conditioning
		AD22103*

FEATURES

3.3 V, Single Supply Operation Temperature Coefficient of 28 mV/°C 100°C Temperature Span (0°C to +100°C) Accuracy Better Than 2.5% of Full Scale Linearity Better Than 0.5% of Full Scale Output Proportional to Temperature × VS Minimal Self-Heating

High Level, Low Impedance Output Reverse Supply Protected

APPLICATIONS

Microprocessor Thermal Management

Battery and Low Powered Systems

Power Supply Temperature Monitoring

System Temperature Compensation

Board Level Temperature Sensing

MARKETS

Computers

Portable Electronic Equipment

Industrial Process Control

Instrumentation

GENERAL DESCRIPTION

The AD22103 is a monolithic temperature sensor with on-chip signal conditioning. It can be operated over the temperature range 0°C to +100°C, making it ideal for use in numerous 3.3 V applications.

The signal conditioning eliminates the need for any trimming, buffering or linearization circuitry, greatly simplifying the system design and reducing the overall system cost.

The output voltage is proportional to the temperature times the supply voltage (ratiometric). The output swings from 0.25 V at 0°C to +3.05 V at +100°C using a single +3.3 V supply.

Due to its ratiometric nature, the AD22103 offers a cost effective solution when interfacing to an analog-to-digital converter. This is accomplished by using the ADC’s power supply as a reference to both the ADC and the AD22103 (See Figure 1), eliminating the need for and cost of a precision reference.

*Protected by U.S. Patent Nos. 5030849 and 5243319.

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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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

SIMPLIFIED BLOCK DIAGRAM

VS

Ι

VOUT

RT

	+3.3V
	REFERENCE
	ANALOG TO
	DIGITAL
AD22103	CONVERTER
	SIGNAL OUTPUT
	DIRECT TO ADC
	VO
	INPUT
	1kΩ
	0.1µF

Figure 1. Application Circuit

© Analog Devices, Inc., 1995

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: [phone] Fax: [phone]

AD22103–SPECIFICATIONS (TA = +25°C and VS = +2.7 V to +3.6 V unless otherwise noted)

		AD22103K
Parameter	Min	Typ	Max	Units
TRANSFER FUNCTION	VOUT = (VS/3.3 V) × [0.25 V + (28 mV/°C) × TA]			V
TEMPERATURE COEFFICIENT		(VS/3.3 V) × 28		mV/°C
TOTAL ERROR
Initial Error
TA = +25°C		±0.5	±2.0	°C
Error over Temperature		±0.75	±2.5	°C
TA = TMIN to TMAX
Nonlinearity				% FS1
TA = TMIN to TMAX		0.1	0.5
OUTPUT CHARACTERISTICS
Nominal Output Voltage
VS = 3.3 V, TA = 0°C		0.25		V
VS = 3.3 V, TA = +25°C		0.95		V
VS = 3.3 V, TA = +100°C		3.05		V
POWER SUPPLY
Operating Voltage	+2.7	+3.3	+3.6	V
Quiescent Current	350	500	600	μA
TEMPERATURE RANGE				°C
Guaranteed Temperature Range	0		+100
Operating Temperature Range	0		+100	°C
PACKAGE		TO-92
		SOIC

NOTES

1FS (Full Scale) is defined as that of the operating temperature range, 0°C to +100°C. The listed max specification limit applies to the guaranteed temperature range. For example, the AD22103K has a nonlinearity of (0.5%) × (100°C) = 0.5°C over the guaranteed temperature range of 0°C to +100°C.

Specifications subject to change without notice.

CHIP SPECIFICATIONS (TA = +25°C and VS = +3.3 V unless otherwise noted)

Parameter	Min	Typ	Max	Units
TRANSFER FUNCTION	VOUT = (VS/3.3 V) × [0.25 V + (28 mV/°C) × TA]			V
TEMPERATURE COEFFICIENT		(VS/3.3 V) × 28		mV/°C
OUTPUT CHARACTERISTICS
Error
TA = +25°C		±0.5	Note 1	°C
Nominal Output Voltage
TA = +25°C		0.95		V
POWER SUPPLY
Operating Voltage	+2.7	+3.3	+3.6	V
Quiescent Current	350	500	600	μA
TEMPERATURE RANGE				°C
Guaranteed Temperature Range		25
Operating Temperature Range	0		+100	°C

NOTES

1Max specs cannot be guaranteed on chips, however, performance once assembled should be commensurate with the specifications listed in the top table.

Specifications subject to change without notice.

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