Analog Devices AD8210 prb Datasheet

High-Side, Bidirectional

Preliminary Technical Data

FEATURES

Precision bidirectional current sensing High common-mode voltage range

−2 V to +65 V operating Gain = 20 CMRR = 100 dB Wide operating temperature range

Die: −40°C to +150°C 8-lead SOIC: −40°C to +125°C

Adjustable offset Available in SOIC and die form

EXCELLENT AC AND DC PERFORMANCE

5 µV/°C offset drift 30 ppm/°C gain drift 80 dB CMRR dc to 10 kHz

APPLICATIONS

42 V dc-to-dc converter current sensing High-side current sensing Motor controls Transmission controls Diesel injection controls Engine management Suspension controls Vehicle dynamic controls

SUPPLY

Current Shunt Monitor

AD8210

TYPICAL OPERATING CIRCUIT

+IN –IN

GND

AD8210

G = +20

Figure 1.

REF

V+

LOAD

VOUT

05147-001

GENERAL DESCRIPTION

The AD8210 is a high-side, single-supply, bidirectional current shunt monitor that features a wide input, common-mode voltage range of −2 V to +65 V, high bandwidth, a set gain of 20, and a typical 5 V supply voltage.

The AD8210 is offered in die and packaged form. The operating temperature range for the die is 25°C higher (up to 150°C) than that of the packaged part, which enables the user to apply the AD8210 in high temperature applications.

Rev. PrB

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. Trademarks and registered trademarks are the property of their respective owners.

Excellent ac and dc performance over temperature keeps errors in the measurement loop to a minimum. Offset drift is typically below 5 µV/°C, and the gain drift is typically below 30 ppm/°C.

Bidirectional current measurement is achieved by offsetting the output between 0.05 V and 4.8 V with a 5 V supply. With the

2 pin connected to the V+ pin, and the V

REF

1 pin connected

REF

to the GND pin, the output is set at half scale. Attaching both

pins to GND causes the output to be unipolar, starting near

REF

ground. Attaching both V

pins to V+ causes the output to be

REF

unipolar starting near V+. Other offsets can be obtained by applying an external voltage to V

www.analog.com

1 and V

REF

2 pins.

REF

AD8210 Preliminary Technical Data

Specifications..................................................................................... 3

Bidirectional Operation................................................................9

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Typical Performance Characteristics............................................. 6

Theory of Operation ........................................................................ 8

Output Offset Adjustment............................................................... 9

Unidirectional Operation............................................................ 9

Ground Referenced Output ........................................................ 9

V+ Referenced Output................................................................. 9

REVISION HISTORY

1/05—Revision PrB: Preliminary Version

External Reference Output........................................................ 10

Splitting an External Reference ................................................ 10

Splitting the Supply .................................................................... 10

Applications..................................................................................... 11

High-Side Current Sense with a Low-Side Switch................. 11

High-Side Current Sense with a High-Side Switch ............... 11

Outline Dimensions....................................................................... 12

Ordering Guide .......................................................................... 12

Rev. PrB | Page 2 of 12

Preliminary Technical Data AD8210

SPECIFICATIONS

TA = operating temperature range, VS = 5 V, unless otherwise noted.

Table 1.

AD8210 SOIC AD8210 Die Parameter Conditions Min Typ Max Min Typ Max Unit

GAIN

Gain 20 20 V/V Accuracy VO ≥ 0.1 V dc ±0.5 ±1 ±0.5 ±1.5 % Accuracy Over Temperature Specified temperature range ±1.5 ±2.5 % Gain vs. Temperature ±20 ±30 ppm/°C

VOLTAGE OFFSET

Offset Voltage (RTI) 25°C ±1 ±2 mV Over Temperature (RTI) Specified temperature range ±2 ±4 mV Offset Drift 5 10 µV/°C

INPUT

Input Impedance

Differential 2 2 kΩ Common Mode V common-mode > 5 V 5 5 MΩ

Common Mode V common-mode < 5 V 3.5 3.5 kΩ Input Voltage Range Common-mode, continuous −2 +65 −2 +65 V Input Voltage Range Differential, unconditional 250 250 mV Input Voltage Range Differential ±125 ±125 mV Common-Mode Rejection f = 1 kHz 100 dB Common-Mode Rejection f = 10 kHz 100 90 dB

OUTPUT

Output Voltage Range 0.05 4.8 0.05 4.8 V

DYNAMIC RESPONSE

Small Signal −3 dB Bandwidth 500 500 kHz Slew Rate 3 3 V/µs

NOISE

0.1 Hz to 10 Hz, RTI TBD TBD µV p-p Spectral Density, 1 kHz, RTI TBD TBD µV/√Hz

OFFSET ADJUSTMENT

Offset Adjustment Range VS = 5 V 0.05 4.8 0.05 4.8 V

POWER SUPPLY

Operating Range For specified performance 4.5 5.5 4.5 5.5 V Quiescent Current Over Temperature VO = 0.1 V dc 0.5 1 0.5 1 mA Power-Supply Rejection Ratio 80 80 dB

TEMPERATURE RANGE

For Specified Performance Operating temperature range −40 +125 −40 +150 °C

Rev. PrB | Page 3 of 12

AD8210 Preliminary Technical Data

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage 12 V Continuous Input Voltage 65 V Transient Input Voltage 72 V Reverse Supply Voltage −0.3 V Negative Common-Mode Range −2.3 V Operating Temperature Range −40°C to +125°C Storage Temperature −65°C to +150°C Lead Temperature Range 300°C

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; 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.

Rev. PrB | Page 4 of 12

+ 8 hidden pages