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PDF AD8216 Data sheet ( Hoja de datos )
| Número de pieza | AD8216 | |
| Descripción | Bidirectional 65 V Difference Amplifier | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
±4000 V HBM ESD
Ideal for current shunt applications
High common-mode voltage range
−4 V to +65 V operating
−40 V to +80 V survival
3 MHz bandwidth
<100 ns output propagation delay
Gain: 3 V/V
Wide operating temperature range
Die: −40°C to +150°C
8-lead SOIC: −40°C to +125°C
Adjustable output offset
Available in 8-lead SOIC
Excellent ac and dc performance
10 µV/°C offset drift
10 ppm/°C gain drift
Qualified for automotive applications
APPLICATIONS
High-side current sensing in
DC-to-dc converters
Motor controls
Transmission controls
Diesel-injection controls
Engine management
Suspension controls
Vehicle dynamic controls
GENERAL DESCRIPTION
The AD8216 is a single-supply, difference amplifier ideal for
amplifying small differential voltages in the presence of large
common-mode voltages. The operating input common-mode
voltage range extends from −4 V to +65 V. The typical supply
voltage is 5 V. The AD8216 features a 3 MHz bandwidth,
allowing for the input-to-output propagation delay that is
always less than 150 ns. This feature is ideal for applications
monitoring rapidly increasing and decreasing load currents.
The AD8216 is offered in a SOIC package. The operating
temperature range is −40°C to +125°C.
High Bandwidth, Bidirectional
65 V Difference Amplifier
AD8216
FUNCTIONAL BLOCK DIAGRAM
V+
6
+IN 8
–IN 1
5 OUT
AD8216
7 VREF1
NC 4
NC = NO CONNECT
2
GND
Figure 1.
3 VREF2
Excellent ac and dc performance over temperature keep errors
in the measurement loop to a minimum. Offset and gain drift
are guaranteed to a maximum of 20 µV/°C and 15 ppm/°C,
respectively.
The output offset can be adjusted from 0.06 V to 4.9 V with a
5 V supply by using the VREF1 pin and the VREF2 pin. With the
VREF1 pin attached to the V+ pin and the VREF2 pin attached to
the GND pin, the output is set at half scale. Attaching both VREF1
and VREF2 to GND causes the output to be unipolar, starting
near ground. Attaching both VREF1 and VREF2 to V+ causes the
output to be unipolar, starting near V+. Other offsets can be
obtained by applying an external voltage to VREF1 and VREF2.
Rev. C
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 ©2007–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8216
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Continuous Input Common-Mode Voltage
Continuous Input Differential Voltage
Reverse Supply Voltage
ESD Rating
HBM (Human Body Model)
CDM (Charged Device Model)
Operating Temperature Range
Storage Temperature Range
Output Short-Circuit Duration
Rating
12.5 V
−40 V to +80 V
6V
0.3 V
±4000 V
±1000 V
−40°C to +125°C
−65°C to +150°C
Indefinite
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
ESD CAUTION
Data Sheet
Rev. C | Page 4 of 16
5 Page 
AD8216
THEORY OF OPERATION
The AD8216 is a single-supply difference amplifier typically used
to accurately amplify a small differential current shunt voltage in
the presence of a rapidly changing common-mode voltage.
The AD8216 consists of an amplifier (A1), a resistor network,
a small voltage reference, and a bias circuit (not shown),
see Figure 23.
The set of input attenuators preceding A1 consist of RA, RB, and
RC, which feature a combined series resistance of approximately
200 kΩ ± 20%. The purpose of these resistors is to attenuate the
input voltage to match the input voltage range of A1. This
balanced resistor network attenuates the common-mode signal
by a ratio of 1/18. A1 amplifier inputs are held within the power
supply range, even if Pin 1 and Pin 8 exceed the supply or fall
below common (ground). A reference voltage of 250 mV biases
the attenuator above ground, which allows the amplifier to
operate in the presence of negative common-mode voltages.
The input resistor network also attenuates normal (differential)
mode voltages. Therefore, Amplifier A1 features a gain of
54 V/V to provide a total system gain of 3V/V.
Total Gain (V/V) = 1/18 (V/V) × 54 (V/V) = 3 V/V
Data Sheet
The reference inputs, VREF1 and VREF2, are tied through resistors
to the positive input of A1, which allows the output offset to be
adjusted anywhere in the output operating range. The gain is
1 V/V from the reference pins to the output when the reference
pins are used in parallel. When they are used to divide the supply,
the gain is 0.5 V/V.
The ratios of RA, RB, RC, and RF are trimmed to a high level of
precision to allow the CMRR to exceed 80 dB. This performance is
accomplished by laser trimming the resistor ratio matching to
better than 0.01%.
+IN –IN
RA RA
RB RB
A1
RF
RC RC
250mV
AD8216
VOUT
VREF1
RREF
RREF
VREF2
GND
Figure 23. Simplified Schematic
Rev. C | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AD8216.PDF ] | |
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