AD712KR Analog Devices Inc, AD712KR Datasheet - Page 16

• Manufacturer Part Number: AD712KR
• Description: IC OPAMP BIFET DUAL PREC 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD712KR

• Rohs Status: RoHS non-compliant
• Amplifier Type: J-FET
• Number Of Circuits: 2
• Slew Rate: 20 V/µs
• -3db Bandwidth: 4MHz
• Current - Input Bias: 20pA
• Voltage - Input Offset: 200µV
• Current - Supply: 5mA
• Current - Output / Channel: 25mA
• Voltage - Supply, Single/dual (±): 9 V ~ 36 V, ±4.5 V ~ 20 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Output Type: -
• Gain Bandwidth Product: -

AD712
DRIVING A LARGE CAPACITIVE LOAD
The circuit in Figure 46 uses a 100 Ω isolation resistor that enables
the amplifier to drive capacitive loads exceeding 1500 pF; the
resistor effectively isolates the high frequency feedback from
the load and stabilizes the circuit. Low frequency feedback is
returned to the amplifier summing junction via the low-pass filter
formed by the 100 Ω series resistor and the Load Capacitance C
Figure 47 shows a typical transient response for this connection.
TYPICAL CAPACITANCE
LIMIT FOR VARIOUS
LOAD RESISTORS
2kΩ
10kΩ
20Ω
R
1
INPUT
C
1500pF
1500pF
1000pF
1
4.99kΩ
Figure 46. Circuit for Driving a Large Capacitive Load
UP TO
30pF
+
–
AD712
+V
1/2
–V
4.99kΩ
IN
IN
0.1µF
+
–
0.1µF
–
+
100Ω
C1
R1
OUTPUT
Rev. H | Page 16 of 20
L
.
100
90
0%
10
Figure 47. Transient Response R
5V
L
= 2 kΩ, C
1µs
L
= 500 pF