AD8620BR-REEL7 Analog Devices Inc, AD8620BR-REEL7 Datasheet - Page 21

• Manufacturer Part Number: AD8620BR-REEL7
• Description: IC,Operational Amplifier,DUAL,BIPOLAR/JFET,SOP,8PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of AD8620BR-REEL7

• Rohs Status: RoHS non-compliant
• Design Resources: Using AD7328 in Appls with Single-Ended Industrial-Level Signals (CN0047)
• Amplifier Type: J-FET
• Number Of Circuits: 2
• Slew Rate: 60 V/µs
• Gain Bandwidth Product: 25MHz
• Current - Input Bias: 3pA
• Voltage - Input Offset: 45µV
• Current - Supply: 3mA
• Current - Output / Channel: 45mA
• Voltage - Supply, Single/dual (±): ±5 V ~ 13 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Output Type: -
• -3db Bandwidth: -

High Speed, Low Noise Differential Driver
The AD8620 is a perfect candidate as a low noise differential
driver for many popular ADCs. There are also other applica-
tions (such as balanced lines) that require differential drivers.
The circuit of Figure 70 is a unique line driver widely used in
industrial applications. With ±13 V supplies, the line driver can
deliver a differential signal of 23 V p-p into a 1 kΩ load. The
high slew rate and wide bandwidth of the AD8620 combine to
yield a full power bandwidth of 145 kHz while the low noise
front end produces a referred-to-input noise voltage spectral
density of 6 nV/√Hz. The design is a balanced transmission system
without transformers, where output common-mode rejection of
noise is of paramount importance. Like the transformer-based
design, either output can be shorted to ground for unbalanced
line driver applications without changing the circuit gain of 1.
This allows the design to be easily set to noninverting, inverting,
or differential operation.
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3
2
V+
V–
AD8610
6
1kΩ
1kΩ
R4
R3
Figure 70. Differential Driver
R8
1kΩ
R9
1kΩ
0
3
2
5
6
1kΩ
V+
V+
R1
V–
V–
1/2 AD8620
1/2 AD8620
1kΩ
1
R2
7
U2
U3
AD8610/AD8620
1kΩ
R12
R10
50Ω
R11
50Ω
V
O
2 – V
0
R13
1kΩ
O
1 = V
R5
1kΩ
R6
10kΩ
R7
1kΩ
IN
V
V
O
O
1
2