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AD8219 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8219
Beschreibung Unidirectional Current Shunt Monitor
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
AD8219 Datasheet, Funktion
FEATURES
High common-mode voltage range
4 V to 80 V operating
−0.3 V to +85 V survival
Buffered output voltage
Gain = 60 V/V
Wide operating temperature range: −40°C to +125°C
Excellent ac and dc performance
±100 nV/°C typical offset drift
±50 µV/°C typical offset
±5 ppm/°C typical gain drift
110 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 AD8219 is a high voltage, high resolution, current shunt
amplifier. It features a set gain of 60 V/V, with a maximum
±0.3% gain error over the entire temperature range. The
buffered output voltage directly interfaces with any typical
converter. The AD8219 offers excellent input common-mode
rejection from 4 V to 80 V. The AD8219 performs unidirectional
current measurements across a shunt resistor in a variety of
industrial and telecom applications including motor control,
power management, and base station power amplifier bias
control.
Zero Drift, Unidirectional
Current Shunt Monitor
AD8219
FUNCTIONAL BLOCK DIAGRAM
VS
R4
LDO
R1
–IN
+IN
R2
AD8219
R3
OUT
GND
Figure 1.
The AD8219 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,
regardless of the common-mode voltage present, while the
typical input offset voltage is ±50 µV.
The AD8219 is offered in a 8-lead MSOP package.
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
©2011 Analog Devices, Inc. All rights reserved.
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AD8219 Datasheet, Funktion
AD8219
TYPICAL PERFORMANCE CHARACTERISTICS
–19.0
–19.5
–20.0
–20.5
–21.0
–21.5
–22.0
–22.5
–23.0
–23.5
–24.0
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 3. Typical Input Offset vs. Temperature
140
120
110
100
90
80
70
60
50
100
1k 10k 100k
FREQUENCY (Hz)
Figure 4. Typical CMRR vs. Frequency
1M
0
–50
–100
–150
–200
–250
–300
–350
–400
–450
–500
–40
–20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 5. Typical Gain Error vs. Temperature
140
40
30
20
10
0
–10
–20
–30
–40
1k
10k 100k 1M 10M
FREQUENCY (Hz)
Figure 6. Typical Small Signal Bandwidth (VOUT = 200 mV p-p)
7
6
5
4
3
2
1
0
–1
–2
0 1 2 3 4 5 6 7 8 9 10
DIFFERENTIAL INPUT VOLTAGE (mV)
Figure 7. Typical Output Error vs. Differential Input Voltage
300
250
+IN
200
150
100
50
–IN
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
INPUT COMMON-MODE VOLTAGE (V)
Figure 8. Input Bias Current vs. Input Common-Mode Voltage
(Differential Input Voltage = 5 mV) (VS = 5 V)
Rev. 0 | Page 6 of 16
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AD8219 pdf, datenblatt
AD8219
APPLICATIONS INFORMATION
HIGH-SIDE CURRENT SENSING
In this configuration, the shunt resistor is referenced to the
battery (see Figure 28). High voltage is present at the inputs
of the current sense amplifier. When the shunt is battery
referenced, the AD8219 produces a linear ground referenced
analog output.
ILOAD
4V SHUNT
TO LOAD
80V +IN –IN
AD8219
VS OUT
GND
Figure 28. Battery Referenced Shunt Resistor
Figure 28 shows the supply pin, VS, connected directly to the
positive input (+IN) pin. In this mode, the internal LDO powers
the AD8219 as long as the common-mode voltage at the input
pins is 4 V to 80 V. Additionally, VS can also be connected to a
standalone supply that can vary from 4 V to 80 V as shown in
Figure 29.
ILOAD
4V
TO
80V
SHUNT
LOAD
+IN –IN
AD8219
4V VS OUT
TO GND
80V
Figure 29. Standalone Supply Operation
MOTOR CONTROL CURRENT SENSING
The AD8219 is a practical, accurate solution for high-side
current sensing in motor control applications. In cases where
the shunt resistor is referenced to a battery and the current
flowing is unidirectional (as shown in Figure 30), the AD8219
monitors the current with no additional supply pin necessary
provided the battery voltage in the following circuit is in the 4 V
to 80 V range.
BATTERY
IMOTOR
+IN –IN
AD8219
VS OUT
GND
MOTOR
Figure 30. High-Side Current Sensing in Motor Control
Rev. 0 | Page 12 of 16
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