AD8048 Analog Devices, AD8048 Datasheet

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AD8048

Manufacturer Part Number
AD8048
Description
250 MHz, General Purpose Voltage Feedback Op Amps Gain 2 Stable
Manufacturer
Analog Devices
Datasheet

Specifications of AD8048

Vcc-vee
6V to 12V
Isy Per Amplifier
6.6mA
Packages
DIP,SOIC
-3db Bandwidth
260MHz
Slew Rate
1kV/µs
Vos
1mV
Ib
1µA
# Opamps Per Pkg
1
Input Noise (nv/rthz)
3.8nV/rtHz

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PRODUCT DESCRIPTION
The AD8047 and AD8048 are very high speed and wide band-
width amplifiers. The AD8047 is unity gain stable. The AD8048 is
stable at gains of two or greater. The AD8047 and AD8048,
which utilize a voltage feedback architecture, meet the require-
ments of many applications that previously depended on current
feedback amplifiers.
A proprietary circuit has produced an amplifier that combines
many of the best characteristics of both current feedback and
voltage feedback amplifiers. For the power (6.6 mA max), the
AD8047 and AD8048 exhibit fast and accurate pulse response
(30 ns to 0.01%) as well as extremely wide small signal and large
signal bandwidth and low distortion. The AD8047 achieves
–54 dBc distortion at 20 MHz, 250 MHz small signal, and
130 MHz large signal bandwidths.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
FEATURES
Wide Bandwidth
5.8 mA Typical Supply Current
Low Distortion, (SFDR) Low Noise
Drives 50 pF Capacitive Load
High Speed
APPLICATIONS
Low Power ADC Input Driver
Differential Amplifiers
IF/RF Amplifiers
Pulse Amplifiers
Professional Video
DAC Current to Voltage Conversion
Baseband and Video Communications
Pin Diode Receivers
Active Filters/Integrators
3 V to
Small Signal
Large Signal (2 V p-p) 130 MHz
–66 dBc Typ @ 5 MHz
–54 dBc Typ @ 20 MHz
5.2 nV/ Hz (AD8047), 3.8 nV/ Hz (AD8048) Noise
Slew Rate 750 V/ s (AD8047), 1000 V/ s (AD8048)
Settling 30 ns to 0.01%, 2 V Step
6 V Supply Operation
AD8047, G = +1
250 MHz
AD8048, G = +2
260 MHz
160 MHz
The AD8047 and AD8048’s low distortion and cap load drive
make the AD8047/AD8048 ideal for buffering high speed ADCs.
They are suitable for 12-bit/10 MSPS or 8-bit/60 MSPS ADCs.
Additionally, the balanced high impedance inputs of the voltage
feedback architecture allow maximum flexibility when designing
active filters.
The AD8047 and AD8048 are offered in industrial (–40 C to
+85 C) temperature ranges and are available in 8-lead PDIP
and SOIC packages.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Figure 1. AD8047 Large Signal Transient Response,
V
O
= 4 V p-p, G = +1
Voltage Feedback Op Amps
250 MHz, General Purpose
FUNCTIONAL BLOCK DIAGRAM
+INPUT
–INPUT
–V
NC
S
and SOIC (R) Packages
8-Pin Plastic PDIP (N)
© 2003 Analog Devices, Inc. All rights reserved.
1V
1
2
3
4
NC = NO CONNECT
(TOP VIEW)
AD8047/
AD8048
AD8047/AD8048
8
7
6
5
5ns
NC
+V
OUTPUT
NC
S
www.analog.com

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AD8048 Summary of contents

Page 1

... Additionally, the balanced high impedance inputs of the voltage feedback architecture allow maximum flexibility when designing active filters. The AD8047 and AD8048 are offered in industrial (– +85 C) temperature ranges and are available in 8-lead PDIP and SOIC packages. Figure 1. AD8047 Large Signal Transient Response, ...

Page 2

... MIN MAX MIN MAX 2.5 V OUT MIN MAX MIN MAX –2– (AD8048), unless otherwise noted.) V AD8047A AD8048A Min Typ Max Min Typ Max 170 250 180 260 100 130 135 160 35 50 475 750 740 1000 1 ...

Page 3

... Voltage Swing Bandwidth Product AD8047 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 V-MHz AD8048 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 V-MHz 2 Internal Power Dissipation Plastic Package ( 1.3 W Small Outline Package ( 0.9 W Input Voltage (Common Mode ...

Page 4

... AD8047/AD8048–Typical Performance Characteristics 0.1 F PULSE 7 GENERATOR 500ps AD8047 0 49 –V S TPC 1. AD8047 Noninverting Configuration TPC 2. AD8047 Large Signal Transient Response p- 100mV TPC 3. AD8047 Small Signal Transient Response 400 mV p- ...

Page 5

... AD8048 6 0 49.9 T –V S TPC 7. AD8048 Noninverting Configuration TPC 8. AD8048 Large Signal Transient Response p- + 200 100mV TPC 9. AD8048 Small Signal Transient Response 400 REV. A GENERATOR ...

Page 6

... AD8047/AD8048 1 0 – 100 L – FOR DIP 66.5 FOR SOIC F – 300mV p-p OUT –4 –5 –6 –7 –8 –9 1M 10M FREQUENCY (Hz) TPC 13. AD8047 Small Signal Frequency Response 0 100 –0 FOR DIP 66.5 FOR SOIC –0 300mV p-p OUT – ...

Page 7

... REV. A THIRD HARMONIC 10M 100M TPC 22. AD8047 Short-Term Settling Time 5.5 6.5 TPC 23. AD8047 Long-Term Settling Time 8th 9th 10th 11th 8th 9th 10th 11th = 200 IN –7– AD8047/AD8048 0 100 0 STEP 0.3 OUT 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 – ...

Page 8

... TPC 25. AD8048 Small Signal Frequency Response 6.5 6 100 200 6 300mV p-p OUT 6.2 6.1 6.0 5.9 5.8 5.7 5.6 5.5 1M 10M FREQUENCY (Hz) TPC 26. AD8048 0.1 dB Flatness 100 –10 –20 1k 10k 100k 1M FREQUENCY (Hz) TPC 27. AD8048 Open-Loop Gain and Phase Margin vs. Frequency –1 –2 –3 100M 1G TPC 28 ...

Page 9

... TPC 33. AD8048 Differential Gain and Phase Error + 150 , R = 200 , REV. A 0.5 0.4 0.3 0.2 0.1 0.0 –0.1 –0.2 –0.3 –0.4 –0.5 10M 100M TPC 34. AD8048 Short-Term Settling Time 0.25 0.20 0.15 THIRD HARMONIC 0.10 0.05 0.0 –0.05 –0.10 –0.15 –0.20 –0.25 5.5 6.5 TPC 35. AD8048 Long-Term Settling Time 2 V Step ...

Page 10

... 100 100M 1G 100k TPC 40. AD8048 CMRR vs. Frequency 100 10 1 0.1 0.01 100M 1G 10k TPC 41. AD8048 Output Resistance vs. Frequency +PSRR 100M 1G 3k TPC 42. AD8048 PSRR vs. Frequency –10– 100 L 1M ...

Page 11

... OUT 3.1 –V OUT 2.9 2.7 +V OUT 2.5 –V OUT 2.3 –60 –40 – JUNCTION TEMPERATURE ( C) TPC 43. AD8047/AD8048 Output Swing vs. Temperature 2600 2400 AD8048 2200 2000 1800 1600 1400 AD8047 1200 1000 –60 –40 – JUNCTION TEMPERATURE ( C) TPC 44. AD8047/AD8048 Open-Loop Gain vs. Temperature 94 92 ...

Page 12

... This can be observed by noting the bandwidth specification between the AD8047 (gain of 1) and AD8048 (gain of 2). Feedback Resistor Choice The value of the feedback resistor is critical for optimum perfor- mance on the AD8047 and AD8048. For maximum flatness at a gain and R should be set to 200 ...

Page 13

... DAC I/V conversion. The same characteristics along with low harmonic distortion make them a good choice for ADC buffering/amplification. With superb linearity at relatively high signal frequencies, the AD8047 and AD8048 are ideal drivers for ADCs bits ...

Page 14

... ANALOG Figure 12. AD8047 Used as Driver for an AD872A, a 12-Bit, 10 MSPS A/D Converter Layout Considerations The specified high speed performance of the AD8047 and AD8048 requires careful attention to board layout and compo- nent selection. Proper RF design techniques and low-pass – parasitic component selection are mandatory. ...

Page 15

... SEATING 0.10 0.17 (0.0067) PLANE COMPLIANT TO JEDEC STANDARDS MS-012AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN –15– AD8047/AD8048 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) 0.015 (0.38) 0.010 (0.25) 0.008 (0.20) 0.50 (0.0196) 45 0.25 (0.0099 ...

Page 16

... AD8047/AD8048 Revision History Location 7/03—Data Sheet changed from REV REV. A. Renumbered Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Deleted Evaluation Board Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Updated ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 –16– Page REV. A ...

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