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AD8047ANADN/a10avai250 MHz, General Purpose Voltage Feedback Op Amps
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AD8047AN-AD8047AR-AD8048AN-AD8048AR
250 MHz, General Purpose Voltage Feedback Op Amps
REV. 0250 MHz, General Purpose
Voltage Feedback Op Amps

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.
Figure 1.
VO = 4 V p-p, G = +1
FEATURES
Wide BandwidthAD8047, G = +1AD8048, G = +2
Small Signal250 MHz260 MHz
Large Signal (2 V p-p)130 MHz160 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/μs (AD8047), 1000 V/μs (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
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.
FUNCTIONAL BLOCK DIAGRAM
8-Pin Plastic Mini-DIP (N), Cerdip (Q)
and SO (R) Packages
HARMONIC/NOISE PERFORMANCE
OUTPUT CHARACTERISTICS
POWER SUPPLY
NOTESSee Max Ratings and Theory of Operation sections of data sheet.Measured at AV = 50.Measured with respect to the inverting input.
(±VS = ±5 V; RLOAD = 100 Ω; AV = 1 (AD8047); AV = 2 (AD8048), unless otherwise noted)
AD8047/AD8048–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by these de-
vices is limited by the associated rise in junction temperature.
The maximum safe junction temperature for plastic encapsu-
lated devices is determined by the glass transition temperature
of the plastic, approximately +150°C. Exceeding this limit tem-
porarily may cause a shift in parametric performance due to a
change in the stresses exerted on the die by the package. Exceed-
ing a junction temperature of +175°C for an extended period can
result in device failure.
While the AD8047 and AD8048 are internally short circuit pro-
tected, this may not be sufficient to guarantee that the maxi-
mum junction temperature (+150°C) is not exceeded under all
conditions. To ensure proper operation, it is necessary to ob-
serve the maximum power derating curves.
Figure 2.Plot of Maximum Power Dissipation vs.
Temperature
ORDERING GUIDE

*N = Plastic DIP; R= SOIC (Small Outline Integrated Circuit)
ABSOLUTE MAXIMUM RATINGS1

SupplyVoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12.6V
Voltage Swing × Bandwidth Product (AD8047) . . .180 V – MHz
(AD8048) . . .250 V – MHz
InternalPowerDissipation2
PlasticPackage (N) . . . . . . . . . . . . . . . . . . . . . . . .1.3Watts
SmallOutlinePackage (R) . . . . . . . . . . . . . . . . . . .0.9Watts
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . .±VS
DifferentialInputVoltage . . . . . . . . . . . . . . . . . . . . . . .±1.2V
Output Short Circuit Duration. . . . . . . . . . . . . . . . . . . . .Observe Power Derating Curves
Storage Temperature Range (N, R) . . . . . . . .–65°C to +125°C
Operating Temperature Range (A Grade) . . .–40°C to +85°C
Lead Temperature Range (Soldering10sec) . . . . . . . .+300°C
NOTESStresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only, and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.Specification is for device in free air:
8-Pin Plastic DIP Package: θJA = 90°C/Watt
8-Pin SOIC Package: θJA = 140°C/Watt
CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
METALIZATION PHOTOS

Dimensions shown in inches and (mm).
Connect Substrate to –VS.
AD8047
+VS
VOUT
–IN
AD8048
+VS
–OUT
–IN
AD8047/AD8048
AD8047–Typical Characteristics

Figure 3.Noninverting Configuration, G = +1
Figure 4.Large Signal Transient Response;
VO = 4 V p-p, G = +1
Figure 5.Small Signal Transient Response;
VO = 400 mV p-p, G = +1
Figure 7.
VO = 4 V p-p, G = –1, RF = RIN = 200 Ω
Figure 8.
VO = 400 mV p-p, G = –1, RF = RIN = 200 Ω
AD8048–Typical Characteristics
Figure 9.Noninverting Configuration, G = +2
Figure 10.Large Signal Transient Response;
VO = 4 V p-p, G = +2, RF = RIN = 200 Ω
Figure 11.Small Signal Transient Response;
VO = 400 mV p-p, G = +2, RF = RIN = 200 Ω
Figure 12.Inverting Configuration, G= –1
Figure 13.Large Signal Transient Response;
VO = 4 V p-p, G = –1, RF = RIN = 200 Ω
Figure 14.Small Signal Transient Response;
VO = 400 mV p-p, G = –1, RF = RIN = 200 Ω
AD8047/AD8048
AD8047–Typical Characteristics
FREQUENCY – Hz100M10M
OUTPUT – dBm

Figure 15.AD8047 Small Signal Frequency Response
G = +1
FREQUENCY – Hz100M10M
OUTPUT – dBm
–0.9

Figure 16.AD8047 0.1 dB Flatness, G = +1
–2010M10k
GAIN – dB
PHASE MARGIN – Degrees
100k1M100M
FREQUENCY – Hz100M10M1M
OUTPUT – dBm

Figure 18.AD8047 Large Signal Frequency Response,
G = +1
FREQUENCY – Hz100M10M1M
OUTPUT – dBm

Figure 19.AD8047 Small Signal Frequency Response,
G = –1
100M1M100k10k
OUTPUT – dBm
10M
FREQUENCY – Hz
100M1M100k10k
10M
HARMONIC DISTORTION – dBc

Figure 21.AD8047 Harmonic Distortion vs. Frequency,
G = +1
OUTPUT SWING – V p-p
HARMONIC DISTORTION – dBc
–40

Figure 22.AD8047 Harmonic Distortion vs. Output Swing,
G = +1
DIFF GAIN – %
11th1st2nd3rd4th5th6th7th8th9th10th
11th1st2nd3rd4th5th6th7th8th9th10th
DIFF PHASE – Degrees–0.04
0.02

Figure 24.AD8047 Short-Term Settling Time, G = +1
SETTLING TIME – µs
ERROR – %
–0.25261014181216

Figure 25.AD8047 Long-Term Settling Time, G = +1
Figure 26.AD8047 Noise vs. Frequency
AD8047/AD8048
AD8048–Typical Characteristics

Figure 30.AD8048 Large Signal Frequency Response,
G = +2
10M1G100M1M
FREQUENCY – Hz
OUTPUT – dBm

Figure 31.AD8048 Small Signal Frequency Response,
G = –1
HARMONIC DISTORTION – dBc
FREQUENCY – Hz
100M1M100k10k
10M

Figure 27.AD8048 Small Signal Frequency Response,
G = +2
10M1G100M1M
FREQUENCY – Hz
OUTPUT – dBm
5.6

Figure 28.AD8048 0.1 dB Flatness, G = +2
10k100k1G100M10M1M
FREQUENCY – Hz
GAIN – dB–40
PHASE – Degrees
10M1G100M1M
FREQUENCY – Hz
OUTPUT – dBm
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