AD9631ARZ Analog Devices Inc, AD9631ARZ Datasheet - Page 15

• Manufacturer Part Number: AD9631ARZ
• Description: IC OPAMP VF ULDIST 70MA 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD9631ARZ

• Slew Rate: 1300 V/µs
• Amplifier Type: Voltage Feedback
• Number Of Circuits: 1
• -3db Bandwidth: 320MHz
• Current - Input Bias: 2µA
• Voltage - Input Offset: 3000µV
• Current - Supply: 17mA
• Current - Output / Channel: 70mA
• Voltage - Supply, Single/dual (±): 6 V ~ 12 V, ±3 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Op Amp Type: Wideband
• No. Of Amplifiers: 1
• Bandwidth: 320MHz
• Supply Voltage Range: ± 3V To ± 5V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Active Filters
The wide bandwidth and low distortion of the AD9631 and
AD9632 are ideal for the realization of higher bandwidth active
filters. These characteristics, while being more common in
many current feedback op amps, are offered in the AD9631 and
AD9632 in a voltage feedback configuration. Many active filter
configurations are not realizable with current feedback amplifiers.
A multiple feedback active filter requires a voltage feedback
amplifier and is more demanding of op amp performance than
other active filter configurations, such as the Sallen-Key. In
general, the amplifier should have a bandwidth that is at least
10 times the bandwidth of the filter if problems due to phase shift
of the amplifier are to be avoided.
Figure 9 is an example of a 20 MHz low-pass multiple feedback
active filter using an AD9632.
REV. C
V
IN
154
R1
ANALOG
Figure 9. Active Filter Circuit
154
R4
C2
100pF
IN
Figure 10. AD9631 Used as Driver for an AD872, a 12-Bit, 10 MSPS A/D Converter
78.7
R3
100
130
C1
50pF
–5V ANALOG
AD9632
–5V
140
AD9631
+5V ANALOG
10 F
+5V
0.1 F
10 F
0.1 F
0.1 F
10 F
0.1 F
10 F
+5V ANALOG
V
OUT
0.1 F
0.1 F
1 F
27
28
26
0.1 F
4
5
1
2
–15–
AV
AGND
REF GND
REF IN
REF OUT
V
V
INA
INB
AV
DD
SS
3
–5V ANALOG
Choose
F
a = Damping Ratio = 1/Q = 2
H = Absolute Value of Circuit Gain =
Then
A/D Converter Driver
As A/D converters move toward higher speeds with higher resolu-
tions, there becomes a need for high performance drivers that
will not degrade the analog signal to the converter. It is desirable
from a system’s standpoint that the A/D be the element in the
signal chain that ultimately limits overall distortion. This places
new demands on the amplifiers that are used to drive fast, high
resolution A/Ds.
With high bandwidth, low distortion, and fast settling time, the
AD9631 and AD9632 make high performance A/D drivers for
advanced converters. Figure 10 is an example of an AD9631 used
as an input driver for an AD872, a 12-bit, 10 MSPS A/D converter.
O
AD872
= Cutoff Frequency = 20 MHz
AV
DGND
DGND
AGND
BIT10
BIT11
BIT12
DV
DV
MSB
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
BIT8
BIT9
SS
CLK
OTR
25
DD
DD
0.1 F
23
20
19
18
17
16
15
14
13
12
11
10
7
6
22
21
9
8
+5V DIGITAL
0.1 F
0.1 F
10
DIGITAL OUTPUT
C
k
R
R
R
1
2
4
=
3
=
=
=
=
2
+5V DIGITAL
2
4 1
2
H R
F C
C H
HK
K H
(
O
(
(
1
AD9631/AD9632
49.9
)
1
2
+
+
CLOCK INPUT
1
–R4
1
R1
)
)
= 1