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PDF AD8207 Data sheet ( Hoja de datos )
| Número de pieza | AD8207 | |
| Descripción | Bidirectional Difference Amplifier | |
| Fabricantes | Analog Devices | |
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FEATURES
Ideal for current shunt applications
EMI filters included
1 μV/°C maximum input offset drift
High common-mode voltage range
−4 V to +65 V operating (5 V supply)
−4 V to +35 V operating (3.3 V supply)
−25 V to +75 V survival
Gain = 20 V/V
3.3 V to 5.5 V supply range
Wide operating temperature range: −40°C to +125°C
Bidirectional current monitoring
<500 nV/°C typical offset drift
<10 ppm/°C typical gain drift
>90 dB CMRR dc to 10 kHz
Qualified for automotive applications
APPLICATIONS
High-side current sensing in
Motor control
Solenoid control
Engine management
Electric power steering
Suspension control
Vehicle dynamic control
DC-to-DC converters
Zero-Drift, High Voltage,
Bidirectional Difference Amplifier
AD8207
FUNCTIONAL BLOCK DIAGRAM
V+
+IN
–IN
AD8207
ZERO
DRIFT
OUT
RANGE
REF
VREF1
VREF2
GND
Figure 1.
GENERAL DESCRIPTION
The AD8207 is a single-supply difference amplifier ideal for
amplifying small differential voltages in the presence of large
common-mode voltage. The operating input common-mode
voltage range extends from −4 V to +65 V with a 5 V supply.
The AD8207 works with a single-supply voltage of 3.3 V to 5 V,
and is ideally suited to withstand large input PWM common-
mode voltages, typical in solenoid and motor control applications.
The AD8207 is available in an 8-lead SOIC package. Excellent
dc performance over temperature keeps errors in the mea-
surement loop to a minimum. Offset drift is typically less
than 500 nV/°C, and gain drift is typically below 10 ppm/°C.
The AD8207 is ideal for bidirectional current sensing
applications. It features two reference pins,VREF1 and VREF2,
that allow the user to easily offset the output of the device to
any voltage within the supply range. With VREF1 attached to the
V+ pin and VREF2 attached to the GND pin, the output is set at
half scale. Attaching both pins to GND causes the output to
be unipolar, starting near ground. Attaching both pins to V+
causes the output to be unipolar starting near V+. Other output
offsets are achieved by applying an external low impedance
voltage to the VREF1 and VREF2 pins.
Rev. 0
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.
www.DataSheet.in
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2010 Analog Devices, Inc. All rights reserved.
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AD8207
–IN 1
GND 2
AD8207
8 +IN
7 VREF1
VREF2 3 TOP VIEW 6 V+
RANGE 4 (Not to Scale) 5 OUT
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
1 −IN
2 GND
3 VREF2
4 RANGE
5 OUT
6 V+
7 VREF1
8 +IN
Description
Negative Input.
Ground Pin.
Reference Input.
Range Pin. This pin switches between 4.5 V to 5.5 V and 3.3 V to 4.5 V supply operation.
Output.
Supply Pin.
Reference Input.
Positive Input.
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Rev. 0 | Page 5 of 16
5 Page 
POWER SUPPLY ADJUSTMENT
3.3 V TO 4.5 V SUPPLY OPERATION
The AD8207 can operate with a single-supply voltage as low
as 3.3 V to 4.5 V. This mode of operation is achieved by con-
necting the RANGE pin (Pin 4) to the supply (see Figure 26).
It is recommended that an external resistor be placed in series
from the RANGE pin to the supply. This resistor can be a
typical 5 kΩ 1% resistor.
SHUNT
3.3V
18
AD8207
27
3 TOP VIEW 6
4 (Not to Scale) 5
3.3V
OUT
Figure 26. 3.3 V Supply Operation
Note that in this mode of operation, the common-mode range
of the AD8207 is limited to −4 V to +35 V. The output and
reference input ranges are limited to the supply of the part. The
user can have a 4.5 V supply and connect the RANGE pin from
3.3 V to 4.5 V. Alternatively, the user can connect the RANGE
pin as high as 4.5 V, with the supply from 3.3 V to 4.5 V.
AD8207
4.5 V TO 5.5 V SUPPLY OPERATION
In most applications, the AD8207 operates with a single 5 V
supply. In this mode, the operating input common-mode
range of the AD8207 is rated from −4 V to +65 V. To operate
the device with a 5 V supply (includes 4.5 V to 5.5 V), connect
the RANGE pin (Pin 4) to logic low, or GND, as shown in
Figure 27.
SHUNT
18
AD8207
27
3 TOP VIEW 6
4 (Not to Scale) 5
5V
OUT
Figure 27. 5 V Supply Bidirectional Operation
The output and reference input ranges are limited to the
supply voltage used. With a supply voltage from 4.5 V to 5.5 V,
the RANGE pin (Pin 4) should be connected to GND to achieve
the maximum input common-mode range specification of −4 V
to +65 V.
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Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD8207.PDF ] | |
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