AD8211YRJZ-R2 Analog Devices Inc, AD8211YRJZ-R2 Datasheet - Page 12

• Manufacturer Part Number: AD8211YRJZ-R2
• Description: Current-Shunt Monitor 5-Pin SOT-23 T/R
• Manufacturer: Analog Devices Inc

Specifications of AD8211YRJZ-R2

• Package: 5SOT-23
• Operating Temperature: -40 to 125 °C
• Function: Current Monitor
• Sensing Method: High/Low-Side
• Accuracy: ±0.25%
• Voltage - Input: -2 ~ 65 V
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• No. Of Amplifiers: 1
• Input Offset Voltage: 1mV
• Gain Db Max: 20dB
• Bandwidth: 500kHz
• Cmrr: 120dB
• Slew Rate: 4.5V/µs
• Supply Voltage Range: 4.5V To 5.5V
• Supply Current: 1.2mA
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD8211
APPLICATIONS INFORMATION
HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE
SWITCH
In such load control configurations, the PWM-controlled
switch is ground referenced. An inductive load (solenoid) is tied
to a power supply. A resistive shunt is placed between the switch
and the load (see Figure 25). An advantage of placing the shunt on
the high side is that the entire current, including the recirculation
current, can be measured because the shunt remains in the loop
when the switch is off. In addition, diagnostics can be enhanced
because shorts to ground can be detected with the shunt on the
high side. In this circuit configuration, when the switch is
closed, the common-mode voltage moves down to near the
negative rail. When the switch is opened, the voltage reversal
across the inductive load causes the common-mode voltage to
be held one diode drop above the battery by the clamp diode.
HIGH-SIDE CURRENT SENSING
In this configuration, the shunt resistor is referenced to the
battery. High voltage is present at the inputs of the current sense
amplifier. In this mode, the recirculation current is again measured
and shorts to ground can be detected. When the shunt is battery
referenced, the AD8211 produces a linear ground-referenced
analog output. An
current detection signal in as little as 100 ns. This feature is
useful in high current systems where fast shutdown in over-
current conditions is essential.
OUT
V+
1
5
3
4
5V
AD8211
GND
2
2
AD8214
Figure 25. Low-Side Switch
V
V
IN+
IN–
1
3
5
4
can also be used to provide an over-
INDUCTIVE
LOAD
SHUNT
SWITCH
CLAMP
DIODE
BATTERY
Rev. A | Page 12 of 16
DETECTION (<100ns)
LOW-SIDE CURRENT SENSING
In systems where low-side current sensing is preferred, the
AD8211 provides an integrated solution with great accuracy.
Ground noise is rejected, CMRR is typically higher than 90 dB,
and output linearity is not compromised, regardless of the input
differential voltage.
OVERCURRENT
OUT
V+
1
5
3
4
5V
AD8211
Figure 27. Ground-Referenced Shunt Resistor
Figure 26. Battery-Referenced Shunt Resistor
OUT
GND
NC
5
4
OUT
2
2
V+
3
1
4
5
V
5V
GND
AD8211
REG
6
3
AD8214
V
V
GND
IN+
IN–
1
3
5
4
2
2
NC
+IN
7
2
V
V
IN+
IN–
1
3
5
4
–IN
V
8
1
INDUCTIVE
LOAD
S
SHUNT
SWITCH
CLAMP
DIODE
INDUCTIVE
LOAD
SHUNT
CLAMP
DIODE
SWITCH
BATTERY
BATTERY