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PDF AD8213 Data sheet ( Hoja de datos )
| Número de pieza | AD8213 | |
| Descripción | Dual High Voltage Current Shunt Monitor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD8213 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Data Sheet
FEATURES
±4000 V human body model (HBM) ESD
High common-mode input voltage range
−2 V to +65 V operating
−3 V to +68 V survival
Buffered output voltage
Wide operating temperature range
−40°C to +125°C for Y grade
−40°C to +150°C for H grade
Excellent ac and dc performance
−10 ppm/°C typical gain drift
120 dB typical CMRR at dc
Qualified for automotive applications
APPLICATIONS
High-side current sensing
Motor controls
Transmission controls
Diesel injection controls
Engine management
Suspension controls
Vehicle dynamic controls
DC to DC converters
GENERAL DESCRIPTION
The AD8213 is a dual-channel, precision current sense amplifier.
It features a set gain of 20 V/V, with a maximum ±0.5% gain
error over the entire temperature range. The buffered output
voltage directly interfaces with any typical converter. Excellent
common-mode rejection from −2 V to +65 V, is independent of
the 5 V supply. The AD8213 performs unidirectional current
measurements across a shunt resistor in a variety of industrial
and automotive applications, such as motor control, solenoid
control, or battery management.
Dual, High Voltage,
Current Shunt Monitor
AD8213
FUNCTIONAL BLOCK DIAGRAM
–IN2
+IN2 +IN1
–IN1
A2
PROPRIETARY
OFFSET
CIRCUITRY
OUT2
G = +20
CF2
A1
PROPRIETARY
OFFSET
CIRCUITRY
V+
GND
Figure 1.
G = +20
OUT1
AD8213
CF1
Special circuitry is devoted to output linearity being maintained
throughout the input differential voltage range of 0 mV to 250 mV,
regardless of the common-mode voltage present. The AD8213
also features additional pins that allow the user to low-pass filter
the input signal before amplifying, via an external capacitor to
ground. The AD8213 has an operating temperature range of −40°C
to +125°C for the Y grade, −40°C to +150°C for the H grade and is
offered in a small 10-lead MSOP package.
Rev. D
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 ©2007–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1 10
29
AD8213
38
47
56
Figure 2. Metallization Diagram
–IN2 1
+IN2 2
GND 3
OUT2 4
CF2 5
10 –IN1
AD8213
TOP VIEW
(Not to Scale)
9 +IN1
8 V+
7 OUT1
6 CF1
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic X
1
−IN2
−401
2
+IN2
−401
3
GND
−401
4
OUT2
−394
5 CF2
−448
6 CF1
+448
7
OUT1
+394
8 V+
+401
9
+IN1
+401
10 −IN1
+401
Y
+677
+510
−53
−500
−768
−768
−500
−61
+510
+677
Description
Inverting Input of the Second Channel.
Noninverting Input of the Second Channel.
Ground.
Output of the Second Channel.
Low-Pass Filter Pin for the Second Channel.
Low-Pass Filter Pin for the First Channel.
Output of the First Channel.
Supply.
Noninverting Input of the First Channel.
Inverting Input of the First Channel.
Rev. D | Page 5 of 14
5 Page 
Data Sheet
APPLICATION NOTES
OUTPUT LINEARITY
In all current sensing applications, and especially in automotive
and industrial environments where the common-mode voltage
can vary significantly, it is important that the current sensor
maintain the specified output linearity, regardless of the input
differential or common-mode voltage. The AD8213 contains
specific circuitry on the input stage, which ensures that even
when the differential input voltage is very small, and the common-
mode voltage is also low (below the 5 V supply), the input to
output linearity is maintained. Figure 26 displays the input
differential voltage vs. the corresponding output voltage at
different common modes.
220
200
180
160
140
120
100
VOUT @ VCM = 0V
80
VOUT @ VCM = 65V
60
40
20
0 IDEAL VOUT
0 1 2 3 4 5 6 7 8 9 10
VIN DIFFERENTIAL (mV)
Figure 26. Gain Linearity due to Differential and Common-Mode Voltage
The AD8213 provides a correct output voltage, regardless of the
common mode, when the input differential is at least 2 mV,
which is due to the voltage range of the output amplifier that
can go as low as 33 mV typical. The specified minimum output
amplifier voltage is 100 mV in order to provide sufficient guard
bands. The ability of the AD8213 to work with very small
differential inputs regardless of the common-mode voltage,
allows more dynamic range, accuracy, and flexibility in any
current sensing application.
AD8213
LOW-PASS FILTERING
In typical applications, such as motor and solenoid current
sensing, filtering the differential input signal of the AD8213 can
be beneficial in reducing differential common-mode noise as
well as transients and current ripples flowing through the input
shunt resistor. Typically, such a filter can be implemented by
adding a resistor in series with each input and a capacitor directly
between the input pins. However, the AD8213 features a filter pin
available after the input stage but before the final amplification
stage. The user can connect a capacitor to ground, making a
low-pass filter with the internal precision trimmed, 20 kΩ
resistor. Connecting this capacitor to ground, results in no gain
or CMRR errors. Figure 27 shows the typical connection.
ISHUNT2
ISHUNT1
RSHUNT2
RSHUNT1
R2 (1)
R2 (2)
R1 (1)
R1 (2)
A2
PROPRIETARY
OFFSET
CIRCUITRY
20kΩ
G = +20
CF2
CAP2
A1
PROPRIETARY
OFFSET
CIRCUITRY
20kΩ
V+
G = +20
GND
AD8213
CF1
CAP1
Figure 27. Filter Capacitor Connections
Use the following formula to calculate the 3 dB frequency of
this low-pass filter:
f 3dB
1
220000 C FILTER
It is recommended to always place a capacitor from the filter
pin to GND to prevent the output chatter due to noise
potentially entering through the filter pin and coupling to the
output. This capacitor can be a ≈20 pF capacitor in cases when
all of the bandwidth of the AD8213 is needed in the application.
Rev. D | Page 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AD8213.PDF ] | |
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