AD620AR Analog Devices Inc, AD620AR Datasheet - Page 18

• Manufacturer Part Number: AD620AR
• Description: IC AMP INST LP LN 18MA 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD620AR

• Slew Rate: 1.2 V/µs
• Rohs Status: RoHS non-compliant
• Design Resources: Low Cost Programmable Gain Instrumentation Amplifier Circuit Using ADG1611 and AD620 (CN0146)
• Amplifier Type: Instrumentation
• Number Of Circuits: 1
• -3db Bandwidth: 1MHz
• Current - Input Bias: 500pA
• Voltage - Input Offset: 30µV
• Current - Supply: 900µA
• Current - Output / Channel: 18mA
• Voltage - Supply, Single/dual (±): 4.6 V ~ 36 V, ±2.3 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• No. Of Amplifiers: 1
• Bandwidth: 120kHz
• Supply Current: 1.3mA
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Programmable Gain Max: 10000
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD620
GROUND RETURNS FOR INPUT BIAS CURRENTS
Input bias currents are those currents necessary to bias the
input transistors of an amplifier. There must be a direct return
path for these currents. Therefore, when amplifying “floating”
input sources, such as transformers or ac-coupled sources, there
must be a dc path from each input to ground, as shown in
Figure 47, Figure 48, and Figure 49. Refer to A Designer’s Guide
to Instrumentation Amplifiers (free from Analog Devices) for
more information regarding in-amp applications.
Figure 47. Ground Returns for Bias Currents with Transformer-Coupled Inputs
+ INPUT
– INPUT
R
G
AD620
–V
+V
S
S
REFERENCE
LOAD
TO POWER
GROUND
SUPPLY
V
OUT
Rev. G | Page 18 of 20
Figure 48. Ground Returns for Bias Currents with Thermocouple Inputs
Figure 49. Ground Returns for Bias Currents with AC-Coupled Inputs
100k Ω
+ INPUT
– INPUT
100k Ω
– INPUT
+ INPUT
R
G
R
G
AD620
AD620
+V
–V
S
–V
S
+V
S
S
REFERENCE
REFERENCE
LOAD
TO POWER
LOAD
GROUND
TO POWER
SUPPLY
GROUND
SUPPLY
V
OUT
V
OUT