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PDF AD8047 Data sheet ( Hoja de datos )
| Número de pieza | AD8047 | |
| Descripción | General Purpose Voltage Feedback Op Amps | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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250 MHz, General Purpose
Voltage Feedback Op Amps
AD8047/AD8048
FEATURES
Wide Bandwidth
AD8047, G = +1
Small Signal
250 MHz
Large Signal (2 V p-p) 130 MHz
AD8048, G = +2
260 MHz
160 MHz
5.8 mA Typical Supply Current
Low Distortion, (SFDR) Low Noise
–66 dBc Typ @ 5 MHz
–54 dBc Typ @ 20 MHz
5.2 nV/√Hz (AD8047), 3.8 nV/√Hz (AD8048) Noise
Drives 50 pF Capacitive Load
High Speed
Slew Rate 750 V/s (AD8047), 1000 V/s (AD8048)
Settling 30 ns to 0.01%, 2 V Step
؎3 V to ؎6 V Supply Operation
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
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.
FUNCTIONAL BLOCK DIAGRAM
8-Pin Plastic PDIP (N)
and SOIC (R) Packages
NC 1
–INPUT 2
+INPUT 3
–VS 4
AD8047/
AD8048
(TOP VIEW)
8 NC
7 +VS
6 OUTPUT
5 NC
NC = NO CONNECT
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.
1V 5ns
Figure 1. AD8047 Large Signal Transient Response,
VO = 4 V p-p, G = +1
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
1 page  
RF
PULSE
GENERATOR
TR/TF = 500ps
RIN
VIN
RT = 49.9⍀
+VS 10F
0.1F
7
2
AD8048 6
3
4
0.1F
10F
VOUT
RL = 100⍀
–VS
TPC 7. AD8048 Noninverting Configuration, G = +2
AD8047/AD8048
RF
PULSE
GENERATOR
+VS 10F
TR/TF = 500ps
0.1F
RIN 7
VIN 2
RT = 66.5⍀ AD8048
3
4
6
0.1F
RS = 100⍀
10F
VOUT
RL = 100⍀
–VS
TPC 10. AD8048 Inverting Configuration, G= –1
1V 5ns
TPC 8. AD8048 Large Signal Transient Response;
VO = 4 V p-p, G = +2, RF = RIN = 200 Ω
1V 5ns
TPC 11. AD8048 Large Signal Transient Response;
VO = 4 V p-p, G = –1, RF = RIN = 200 Ω
100mV
5ns
TPC 9. AD8048 Small Signal Transient Response;
VO = 400 mV p-p, G = +2, RF = RIN = 200 Ω
100mV
5ns
TPC 12. AD8048 Small Signal Transient Response;
VO = 400 mV p-p, G = –1, RF = RIN = 200 Ω
REV. A
–5–
5 Page 
4.1
3.9
+VOUT
RL = 1k⍀
3.7
–VOUT
3.5
3.3
+VOUT
RL = 150⍀
3.1
–VOUT
2.9
2.7
+VOUT
2.5 RL = 50⍀
–VOUT
2.3
–60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (؇C)
TPC 43. AD8047/AD8048 Output Swing vs. Temperature
2600
2400
2200
AD8048
2000
1800
1600
1400
1200
AD8047
1000
–60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (؇C)
TPC 44. AD8047/AD8048 Open-Loop Gain vs.
Temperature
94
92
90 +PSRR
88
AD8048
86
84
–PSRR
AD8048
82
+PSRR
AD8047
80
78 AD8047
–PSRR
76
–60 –40 –20 0
20 40 60 80 100 120 140
JUNCTION TEMPERATURE (؇C)
TPC 45. AD8047/AD8048 PSRR vs. Temperature
AD8047/AD8048
83.0
82.0
AD8047
81.0
80.0
AD8048
79.0
78.0
77.0
76.0
–60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (؇C)
TPC 46. AD8047/AD8048 CMRR vs. Temperature
8.0
7.5
؎6V
7.0
؎6V
6.5
6.0
؎5V
5.5
؎5V
5.0
AD8048
AD8047
AD8048
AD8047
4.5
–60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (؇C)
TPC 47. AD8047/AD8048 Supply Current vs.
Temperature
900
800
700 AD8048
600
AD8047
500
400
300
200
100
–60 –40 –20 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (؇C)
TPC 48. AD8047/AD8048 Input Offset Voltage vs.
Temperature
REV. A
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD8047.PDF ] | |
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