AD8212YRMZ Analog Devices Inc, AD8212YRMZ Datasheet - Page 11

• Manufacturer Part Number: AD8212YRMZ
• Description: IC CURRENT MONITOR 8MSOP
• Manufacturer: Analog Devices Inc
• Type: Current Shunt Monr

Specifications of AD8212YRMZ

• Function: Current Monitor
• Sensing Method: High-Side
• Voltage - Input: 7 ~ 65 V
• Current - Output: 500µA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Number Of Channels: 1
• Number Of Elements: 1
• Power Supply Requirement: Single
• Input Resistance: 5@15VMohm
• Input Offset Voltage: 2@15VmV
• Input Bias Current: 1000@15V@-40 TO 125CnA
• Single Supply Voltage (typ): 9/12/15/18/24/28V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Rejection Ratio: 80dB
• Rail/rail I/o Type: No
• Single Supply Voltage (min): 7V
• Single Supply Voltage (max): 65V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: MSOP
• No. Of Amplifiers: 1
• Output Current Per Channel: 500µA
• Gain Db Max: 50dB
• Bandwidth: 1MHz
• Cmrr: 100dB
• Supply Voltage Range: 7V To 65V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Accuracy: -
• Lead Free Status / Rohs Status: Compliant

APPLICATIONS INFORMATION
GENERAL HIGH-SIDE CURRENT SENSING
The AD8212 output is intended to drive high impedance nodes.
Therefore, if interfacing with a converter, it is recommended
that the output voltage across R
of the AD8212 is not affected.
Careful calculations must be made when choosing a gain
resistor so as not to exceed the input voltage range of the
converter. The output of the AD8212 can be as high as
(V+) − 5 V. However, the true output maximum voltage is
dependent upon the differential input voltage, and the resulting
output current across R
(based on a 500 mV maximum input differential limit).
MOTOR CONTROL
The AD8212 is a practical solution for high-side current sensing
in motor control applications. In cases where the shunt resistor
is referenced to battery and the current flowing is unidirectional,
as shown in Figure 25, the AD8212 monitors the current with
no additional supply pin necessary.
NOTES
1. NC = NO CONNECT.
BATTERY
NOTES
1. NC = NO CONNECT.
Figure 25. High-Side Current Sensing for Motor Control
1
2
3
4
1
2
3
4
V+
COM
BIAS
NC
Figure 24. Normal Voltage Range Operation
AD8212
V+
COM
BIAS
NC
AD8212
R
V
ALPHA
I
LOAD
SHUNT
SENSE
V
ALPHA
I
OUT
SENSE
NC
I
OUT
NC
OUT
8
7
6
5
8
7
6
5
, which can be as high as 500 μA
I
OUT
R
OUT
OUT
R
V
OUT
be buffered, so that the gain
OUT
AD8661
I
MOTOR
BATTERY
MOTOR
ADC
Rev. B | Page 11 of 16
500 V CURRENT MONITOR
As noted in the High Voltage Operation Using an External PNP
Transistor section, the AD8212 common-mode voltage range is
extended by using an external PNP transistor. This mode of
operation is achievable with many amplifiers featuring a current
output. However, typically an external Zener regulator must be
added, along with a FET device, to withstand the common-mode
voltage and maintain output current accuracy.
The AD8212 features an integrated regulator (which acts as a
Zener regulator). It offers output current compensation that
allows the user to maintain excellent output current accuracy
by using any PNP transistor. Reliability is increased due to
lower component count. Most importantly, the output current
accuracy is high, allowing the user to choose an inexpensive
PNP transistor to withstand the increased common-mode
voltage.
Figure 26. High Voltage Operation Using External PNP
500V
NOTES
1. TRANSISTOR V
2. NC = NO CONNECT.
VOLTAGE MUST BE 500V.
500kΩ
1
2
3
4
V+
COM
BIAS
NC
AD8212
R
I
LOAD
SHUNT
V
ALPHA
SENSE
CE
I
OUT
NC
BREAKDOWN
8
7
6
5
R
OUT
VOUT
AD8212