AD8047-EB Analog Devices, AD8047-EB Datasheet

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AD8047-EB

Manufacturer Part Number
AD8047-EB
Description
250 MHz/ General Purpose Voltage Feedback Op Amps
Manufacturer
Analog Devices
Datasheet
a
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
requirements 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 and 250 MHz small sig-
nal and 130 MHz large signal bandwidths.
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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 6 V Supply Operation
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
AD8047, G = +1 AD8048, G = +2
250 MHz
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-pin plastic
DIP and SOIC packages.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
V
Figure 1. AD8047 Large Signal Transient Response,
O
= 4 V p-p, G = +1
Voltage Feedback Op Amps
250 MHz, General Purpose
8-Pin Plastic Mini-DIP (N), Cerdip (Q)
FUNCTIONAL BLOCK DIAGRAM
+INPUT
–INPUT
–V
NC
S
and SO (R) Packages
1V
1
2
3
4
NC = NO CONNECT
AD8047/48
AD8047/AD8048
(Top View)
© Analog Devices, Inc., 1995
8
7
6
5
5ns
NC
+V
OUTPUT
NC
S
Fax: 617/326-8703

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AD8047-EB Summary of contents

Page 1

... 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 requirements of many applications that previously depended on current feedback amplifiers ...

Page 2

... Power Supply Rejection Ratio NOTES 1 See Max Ratings and Theory of Operation sections of data sheet. 2 Measured 50 Measured with respect to the inverting input. Specifications subject to change without notice 100 ; (AD8047 LOAD V Conditions Min V 0.4 V p-p 170 OUT p-p 100 OUT ...

Page 3

... C/Watt JA 1 0.5 0 –50 –40 Figure 2. Plot of Maximum Power Dissipation vs. 0.045 (1.14) Temperature V OUT Model AD8047AN AD8047AR AD8047-EB AD8048AN AD8048AR AD8048-EB 0.045 –OUT (1.14 Plastic DIP; R= SOIC (Small Outline Integrated Circuit) –3– AD8047/AD8048 T = +150 C 8-PIN MINI-DIP PACKAGE J 8-PIN SOIC PACKAGE –30 –20 –10 ...

Page 4

... AD8047/AD8048 AD8047–Typical Characteristics 0.1 F PULSE 7 2 GENERATOR 6 AD8047 500ps 49.9 T –V S Figure 3. Noninverting Configuration Figure 4. Large Signal Transient Response p- 100mV Figure 5. Small Signal Transient Response 400 mV p- PULSE GENERATOR ...

Page 5

... IN V OUT R = 100 L R Figure 12. Inverting Configuration, G= –1 5ns Figure 13. Large Signal Transient Response p- – 5ns Figure 14. Small Signal Transient Response; = 200 V = 400 mV p- – –5– AD8047/AD8048 0 AD8048 66 ...

Page 6

... MARGIN 40 30 GAIN 100 L –10 –20 –30 1k 10k 100k 1M 10M FREQUENCY – Hz Figure 17. AD8047 Open-Loop Gain and Phase Margin vs. Frequency 1 0 –1 –2 –3 –4 –5 –6 –7 –8 – Figure 18. AD8047 Large Signal Frequency Response –1 – ...

Page 7

... Figure 24. AD8047 Short-Term Settling Time 0.25 0.20 0.15 0.10 0.05 0.00 –0.05 –0.10 –0.15 –0.20 –0.25 5.5 6.5 Figure 25. AD8047 Long-Term Settling Time 8th 9th 10th 11th 8th 9th 10th 11th Figure 26. AD8047 Noise vs. Frequency = 200 –7– AD8047/AD8048 ...

Page 8

... AD8047/AD8048 AD8048–Typical Characteristics 100 200 300mV p-p OUT –1 –2 –3 1M 10M 100M FREQUENCY – Hz Figure 27. AD8048 Small Signal Frequency Response 6.5 6 100 200 300mV p-p OUT 6.2 6.1 6.0 5.9 5.8 5.7 5.6 5.5 1M 10M FREQUENCY – Hz Figure 28. AD8048 0.1 dB Flatness ...

Page 9

... Figure 37. AD8048 Long-Term Settling Time 2 V Step 8th 9th 10th 11th 8th 9th 10th 11th Figure 38. AD8048 Noise vs. Frequency = 200 –9– AD8047/AD8048 R = 100 200 STEP OUT SETTLING TIME – ns ...

Page 10

... FREQUENCY – Hz Figure 39. AD8047 CMRR vs. Frequency 100 10 1 0.1 0.01 10k 100k 1M 10M FREQUENCY – Hz Figure 40. AD8047 Output Resistance vs. Frequency +PSRR 70 –PSRR 10k 100k 1M 10M FREQUENCY – Hz Figure 41. AD8047 PSRR vs. Frequency 100 ...

Page 11

... OUT 3.1 –V OUT 2.9 2.7 +V OUT 2.5 –V OUT 2.3 –60 –40 – JUNCTION TEMPERATURE – C Figure 45. AD8047/AD8048 Output Swing vs. Temperature 2600 2400 AD8048 2200 2000 1800 1600 1400 AD8047 1200 1000 –60 –40 – JUNCTION TEMPERATURE – C Figure 46. AD8047/AD8048 Open-Loop Gain vs. ...

Page 12

... TERM 10 F – Figure 52. Inverting Operation When the AD8047 is used in the transimpedance ( mode, such as in photodiode detection, the value of R capacitance (C ) are usually known. Generally, the value selected will be in the k range, and a shunt capacitor (C across R will be required to maintain good amplifier stability. ...

Page 13

... The wide bandwidth and low distortion of the AD8047 and AD8048 are ideal for the realization of higher bandwidth active filters. These characteristics, while being more common in many SERIES current feedback op amps, are offered in the AD8047 and AD8048 voltage feedback configuration. Many active filter configu- ...

Page 14

... –5V ANALOG Figure 60. AD8047 Used as Driver for an AD872, a 12-Bit, 10 MSPS A/D Converter The PCB should have a ground plane covering all unused por- tions of the component side of the board to provide a low im- pedance path. The ground plane should be removed from the area near the input pins to reduce stray capacitance ...

Page 15

... MHz 1 MHz Figure 62. Evaluation Board Silkscreen (Top) Figure 63. Board Layout (Solder Side) –15– AD8047/AD8048 1000pF 0 1000pF 0 AD8048 –1 +2 +10 +101 200 200 200 200 ...

Page 16

... AD8047/AD8048 SOIC (R) INVERTER 0.160 (4.06) 0.115 (2.93) Figure 64. Board Layout (Component Side) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Plastic DIP (N Package 0.280 (7.11) PIN 1 0.240 (6.10 0.325 (8.25) 0.430 (10.92) 0.300 (7.62) 0.348 (8.84) 0.060 (1.52) 0.210 0.015 (0.38) (5.33) MAX 0.130 0.015 (0.381) (3.30) 0.008 (0.204) MIN SEATING 0.022 (0.558) ...

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