AD8215YRZ Analog Devices Inc, AD8215YRZ Datasheet - Page 12

• Manufacturer Part Number: AD8215YRZ
• Description: IC CURRENT MONITOR 0.15% 8SOIC
• Manufacturer: Analog Devices Inc
• Type: Current Sense Ampr

Specifications of AD8215YRZ

• Function: Current Monitor
• Sensing Method: High/Low-Side
• Accuracy: ±0.15%
• Voltage - Input: -2 ~ 65 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Channels: 1
• Number Of Elements: 1
• Power Supply Requirement: Single
• Common Mode Rejection Ratio: 80dB
• Input Resistance: 5@5VMohm
• Input Offset Voltage: 1@5VmV
• Single Supply Voltage (typ): 5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Rejection Ratio: 75dB
• Rail/rail I/o Type: No
• Single Supply Voltage (min): 4.5V
• Single Supply Voltage (max): 5.5V
• 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: SOIC N
• No. Of Amplifiers: 1
• Gain Db Max: 20dB
• Bandwidth: 450kHz
• Cmrr: 120dB
• Slew Rate: 4.5V/µs
• Supply Voltage Range: 4.5V To 5.5V
• Supply Current: 1.3mA
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant

AD8215
APPLICATIONS INFORMATION
HIGH-SIDE CURRENT SENSING 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 28). 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 AD8215 produces a linear ground-referenced
analog output. An
current detection signal in as little as 100 ns (see Figure 29).
This feature is useful in high current systems where fast
shutdown in over-current conditions is essential.
BATTERY
AD8214
CLAMP
DIODE
SWITCH
Figure 28. Low-Side Switch
INDUCTIVE
SHUNT
LOAD
can also be used to provide an over-
IN+
IN–
8
4
1
AD8215
GND
NC
7
2
NC
V+
6
3
OUT
NC
5
5
4
5V
Rev. 0 | Page 12 of 16
DETECTION (<100ns)
LOW-SIDE CURRENT SENSING
In systems where low-side current sensing is preferred, the
AD8215 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
5V
OUT
NC
5
4
4
AD8215
NC GND
V+
Figure 30. Ground-Referenced Shunt Resistor
Figure 29. Battery-Referenced Shunt Resistor
6
3
OUT
NC
5
4
5V
OUT
NC
NC
5
4
4
7
2
V
GND
AD8215
REG
NC GND
6
3
AD8214
V+
IN+
IN–
6
3
8
5
1
NC
+IN
NC
7
2
7
2
IN+
IN–
8
5
1
–IN
V
INDUCTIVE
LOAD
8
1
S
SHUNT
SWITCH
CLAMP
DIODE
INDUCTIVE
LOAD
SHUNT
CLAMP
DIODE
SWITCH
BATTERY
BATTERY