Ultralow Distortion, Wide Bandwidth
Voltage Feedback Op Amps
Data Sheet
AD9631/AD9632
Rev. D Document Feedback
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FEATURES
Wide bandwidth
AD9631, G = +1
AD9632, G = +2
Small signal
AD9631, 320 MHz
AD9632, 250 MHz
Large signal (4 V p-p)
AD9631, 175 MHz
AD9632, 180 MHz
Ultralow distortion (SFDR), low noise
−113 dBc typical @ 1 MHz
−95 dBc typical @ 5 MHz
−72 dBc typical @ 20 MHz
46 dBm third-order intercept @ 25 MHz
7.0 nV/√Hz spectral noise density
High speed
Slew rate: 1300 V/μs
Settling time to 0.01%, 2 V step: 16 ns
±3 V to ±5 V supply operation
17 mA supply current
APPLICATIONS
ADC input driver
Differential amplifiers
IF/RF amplifiers
Pulse amplifiers
Professional video
DAC current to voltage
Baseband and video communications
Pin diode receivers
Active filters/integrators/log amps
GENERAL DESCRIPTION
The AD9631/AD9632 are very high speed and wide bandwidth
amplifiers. The AD9631 is unity gain stable. The AD9632 is
stable at gains of 2 or greater. Using a voltage feedback
architecture, the exceptional settling time, bandwidth, and low
distortion of the AD9631/AD9632 meet the requirements of
many applications that previously depended on current feed-
back amplifiers. Its classical op amp structure works much more
predictably in many designs.
PIN CONFIGURATION
Figure 1. 8-Lead PDIP (N) and SOIC (R) Packages
A proprietary design architecture has produced an amplifier
that combines many of the best characteristics of both current
feedback and voltage feedback amplifiers. The AD9631/AD9632
exhibit exceptionally fast and accurate pulse response (16 ns to
0.01%) as well as extremely wide small signal and large signal
bandwidth and ultralow distortion. The AD9631 achieves
−72 dBc at 20 MHz, 320 MHz small signal bandwidth, and
175 MHz large signal bandwidths.
These characteristics position the AD9631/AD9632 ideally for
driving flash as well as high resolution ADCs. Additionally, the
balanced high impedance inputs of the voltage feedback archi-
tecture allow maximum flexibility when designing active filters.
The AD9631/AD9632 are offered in the industrial (−40°C to
+85°C) temperature range. They are available in PDIP and SOIC.
Figure 2. AD9631 Harmonic Distortion vs. Frequency, G = +1
1
2
3
4
NC
–INPUT
+INPU
T
–V
S
8
7
6
5
NC
AD9631/
AD9632
TOP VIEW
(Not to Scale)
+V
S
OUTPUT
NC
NOTES
1. NC = NO CONNECT.
00601-001
30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
10k 100k 1M 10M 100M
HARMONIC DISTORTION (dBc)
FREQUENCY (Hz)
THIRD HARMONIC
SECOND HARMONIC
V
S
= ±5V
R
L
= 500
V
OUT
= 2V p-p
00601-002
AD9631/AD9632 Data Sheet
Rev. D | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Pin Configuration ............................................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Characteristics ............................................................. 3
Absolute Maximum Ratings ............................................................ 5
Metallization Photo ...................................................................... 5
Thermal Resistance ...................................................................... 5
Maximum Power Dissipation ..................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 15
General......................................................................................... 15
Feedback Resistor Choice.......................................................... 15
Pulse Response ........................................................................... 16
Large Signal Performance ......................................................... 16
Power Supply Bypassing ............................................................ 16
Driving Capacitive Loads .......................................................... 16
Applications Information .............................................................. 17
Operation as a Video Line Driver ............................................ 17
Active Filters ............................................................................... 17
Analog-to-Digital Converter (ADC) Driver .......................... 18
Layout Considerations ............................................................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 20
REVISION HISTORY
2/14Rev. C to Rev. D
Changes to Figure 33 ...................................................................... 10
Changes to Analog-to-Digital Converter (ADC) Driver Section
and Figure 66 ................................................................................... 18
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 20
7/03—Rev. B
to Rev. C
Deleted Evaluation Boards information .......................... Universal
Deleted military CERDIP version .................................... Universal
Change to Absolute Maximum Ratings ......................................... 3
Change to TPC 4 ............................................................................... 4
Change to TPC 10............................................................................. 5
Change to Figure 6 ......................................................................... 14
Updated Outline Dimensions ....................................................... 17
1/03Rev. A to Rev. B
Deleted DIP (N) Inverter, SOIC (R) Inverter, and DIP (N)
Noninverter Evaluation Boards in Figures 1214 ...................... 17
Updated Outline Dimensions ....................................................... 18
Data Sheet AD9631/AD9632
Rev. D | Page 3 of 20
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
±V
S
= ±5 V; R
LOAD
= 100 Ω; A
V
= 1 (AD9631); A
V
= 2 (AD9632), unless otherwise noted.
Table 1.
Parameter Test Conditions/Comments
AD9631 AD9632
Unit Min Typ Max Min Typ Max
DYNAMIC PERFORMANCE
Bandwidth (3 dB)
Small Signal V
OUT
0.4 V p-p 220 320 180 250 MHz
Large Signal
1
V
OUT
= 4 V p-p 150 175 155 180 MHz
Bandwidth for 0.1 dB Flatness V
OUT
= 300 mV p-p
R
F
= 140 Ω (AD9631);
R
F
= 425 Ω (AD9632)
130 130 MHz
Slew Rate, Average ± V
OUT
= 4 V step 1000 1300 1200 1500 V/μs
Rise/Fall Time V
OUT
= 0.5 V step 1.2 1.4 ns
V
OUT
= 4 V step
2.5
2.1
ns
Settling Time
To 0.1% V
OUT
= 2 V step 11 11 ns
To 0.01% V
OUT
= 2 V step 16 16 ns
HARMONIC/NOISE PERFORMANCE
Second Harmonic Distortion 2 V p-p; 20 MHz, R
L
= 100 Ω 64 57 54 47 dBc
R
L
= 500 Ω 72 65 72 65 dBc
Third Harmonic Distortion 2 V p-p; 20 MHz, R
L
= 100 Ω 76 69 74 67 dBc
R
L
= 500 Ω 81 74 81 74 dBc
Third-Order Intercept
25 MHz
46
41
dBm
Noise Figure R
S
= 50 Ω 18 14 dB
Input Voltage Noise 1 MHz to 200 MHz 7.0 4.3 nA/√Hz
Input Current Noise 1 MHz to 200 MHz 2.5 2.0 pA/√Hz
Average Equivalent Integrated
Input Noise Voltage
0.1 MHz to 200 MHz 100 60 μV rms
Differential Gain Error (3.58 MHz) R
L
= 150 Ω 0.03 0.06 0.02 0.04 %
Differential Phase Error (3.58 MHz) R
L
= 150 Ω 0.02 0.04 0.02 0.04 Degree
Phase Nonlinearity DC to 100 MHz 1.1 1.1 Degree
DC PERFORMANCE
2
R
L
= 150 Ω
Input Offset Voltage
3
3 10 2 5 mV
T
MIN
T
MAX
13 8 mV
Offset Voltage Drift ±10 ±10 µV/°C
Input Bias Current 2 7 2 7 µA
T
MIN
T
MAX
10 10 µA
Input Offset Current 0.1 3 0.1 3 µA
T
MIN
T
MAX
5 5 µA
Common-Mode Rejection Ratio V
CM
= ± 2.5 V 70 90 70 90 dB
Open-Loop Gain V
OUT
= ± 2.5 V 46 52 46 52 dB
T
MIN
T
MAX
40 40 dB
INPUT CHARACTERISTICS
Input Resistance 500 500
Input Capacitance
1.2
1.2
pF
Input Common-Mode Voltage Range ±3.4 ±3.4 V

AD9632ARZ

Mfr. #:
Manufacturer:
Analog Devices Inc.
Description:
High Speed Operational Amplifiers Ultra Low Distortion Stable
Lifecycle:
New from this manufacturer.
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