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PDF AD8217 Data sheet ( Hoja de datos )
| Número de pieza | AD8217 | |
| Descripción | Zero-Drift Current Shunt Monitor | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
High common-mode voltage range
4.5 V to 80 V operating
0 V to 85 V survival
Buffered output voltage
Wide operating temperature range: −40°C to +125°C
Excellent ac and dc performance
±100 nV/°C typical offset drift
±100 µV/°C typical offset
±5 ppm/°C typical gain drift
100 dB typical CMRR at dc
APPLICATIONS
High side current sensing
48 V telecom
Power management
Base stations
Unidirectional motor control
Precision high voltage current sources
GENERAL DESCRIPTION
The AD8217 is a high voltage, high-resolution current shunt
amplifier. It features a set gain of 20 V/V, with a maximum
±0.35% gain error over the entire temperature range. The
buffered output voltage directly interfaces with any typical
converter. The AD8217 offers excellent common-mode rejection
from 4.5 V to 80 V, and includes an internal LDO, which directly
powers the device from the high voltage rail. Therefore, no addi-
tional supply is necessary, provided that the input common-mode
range is 4.5 V to 80 V. The AD8217 performs unidirectional
current measurements across a shunt resistor in a variety of
industrial and telecom applications including motor control,
battery management, and base station power amplifier bias
control.
High Resolution, Zero-Drift
Current Shunt Monitor
AD8217
FUNCTIONAL BLOCK DIAGRAM
AD8217
R4
R1
–IN
+IN
R2 R3
LDO
OUT
GND
Figure 1.
The AD8217 offers breakthrough performance throughout the
−40°C to +125°C temperature range. It features a zero-drift
core, which leads to a typical offset drift of ±100 nV/°C
throughout the operating temperature and common-mode
voltage range. Special attention 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, and the typical input offset voltage is ±100 μV.
The AD8217 is offered in a 8-lead MSOP package and is
specified from −40°C to +125°C.
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.
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.
Free Datasheet http://www.datasheet4u.com/
1 page  
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
+IN 1
NC 2
NC 3
GND 4
AD8217
TOP VIEW
(Not to Scale)
8 –IN
7 NC
6 NC
5 OUT
NC = NO CONNECT
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
1 +IN
2 NC
3 NC
4 GND
5 OUT
6 NC
7 NC
8 −IN
Description
Noninverting Input. Supply pin to the internal LDO.
No Connect. No internal connection to pin.
No Connect. No internal connection to pin.
Ground.
Output.
No Connect. No internal connection to pin.
No Connect. No internal connection to pin.
Inverting Input.
AD8217
Rev. 0 | Page 5 of 16
Free Datasheet http://www.datasheet4u.com/
5 Page 
APPLICATION NOTES
OUTPUT LINEARITY
In all current sensing applications 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 AD8217
maintains a very high input-to-output linearity even when the
differential input voltage is very small.
200
180
160
140
120
100
80
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10
DIFFERENTIAL INPUT (mV)
Figure 25. Gain Linearity at Small Differential Inputs (VCM = 4.5 V to 80 V)
AD8217
Regardless of the common mode, the AD8217 provides a
correct output voltage when the input differential is at least
1 mV. The ability of the AD8217 to work with very small
differential inputs, regardless of the common-mode voltage,
allows for optimal dynamic range, accuracy, and flexibility in
any current sensing application.
Rev. 0 | Page 11 of 16
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD8217.PDF ] | |
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