AD8216YRZ-RL Analog Devices Inc, AD8216YRZ-RL Datasheet - Page 10

• Manufacturer Part Number: AD8216YRZ-RL
• Description: IC,Differential Amplifier,SINGLE,BIPOLAR,SOP,8PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of AD8216YRZ-RL

• Amplifier Type: Differential
• Number Of Circuits: 1
• Slew Rate: 15 V/µs
• -3db Bandwidth: 3MHz
• Voltage - Input Offset: 500µV
• Current - Supply: 1mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Current - Output / Channel: -
• Gain Bandwidth Product: -
• Current - Input Bias: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD8216
THEORY OF OPERATION
The AD8216 is a single-supply difference amplifier typically used
to accurately amplify a small differential current shunt voltage in
the presence of a rapidly changing common-mode voltage.
The AD8216 consists of an amplifier (A1), a resistor network,
a small voltage reference, and a bias circuit (not shown),
see Figure 23.
The set of input attenuators preceding A1 consist of R
R
200 kΩ ± 20%. The purpose of these resistors is to attenuate the
input voltage to match the input voltage range of A1. This
balanced resistor network attenuates the common-mode signal
by a ratio of 1/18. A1 amplifier inputs are held within the power
supply range, even if Pin 1 and Pin 8 exceed the supply or fall
below common (ground). A reference voltage of 250 mV biases
the attenuator above ground, which allows the amplifier to
operate in the presence of negative common-mode voltages.
The input resistor network also attenuates normal (differential)
mode voltages. Therefore, Amplifier A1 features a gain of
54 V/V to provide a total system gain of 3V/V.
C
, which feature a combined series resistance of approximately
Total Gain (V/V) = 1/18 (V/V) × 54 (V/V) = 3 V/V
A
, R
B
, and
Rev. A | Page 10 of 16
The reference inputs, V
to the positive input of A1, which allows the output offset to be
adjusted anywhere in the output operating range. The gain is
1 V/V from the reference pins to the output when the reference
pins are used in parallel. When they are used to divide the supply,
the gain is 0.5 V/V.
The ratios of R
precision to allow the CMRR to exceed 80 dB. This performance is
accomplished by laser trimming the resistor ratio matching to
better than 0.01%.
R
R
R
A
B
C
–IN
A
, R
250mV
GND
R
R
R
B
A
B
C
Figure 23. Simplified Schematic
, R
+IN
C
, and R
REF
A1
1 and V
AD8216
R
F
F
are trimmed to a high level of
REF
2, are tied through resistors
R
R
REF
REF
V
V
V
OUT
REF
REF
1
2