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Número de pieza | OPA2652 | |
Descripción | Dual / 700MHz / Voltage-Feedback OPERATIONAL AMPLIFIER | |
Fabricantes | Burr-Brown | |
Logotipo | ||
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OPA2652
OPA2652
For most current data sheet and other product
information, visit www.burr-brown.com
TM Dual, 700MHz, Voltage-Feedback
OPERATIONAL AMPLIFIER
FEATURES
q WIDEBAND BUFFER: 700MHz, G = +1
q WIDEBAND LINE DRIVER: 200MHz, G = +2
q HIGH OUTPUT CURRENT: 140mA
q LOW SUPPLY CURRENT: 5.5mA/Ch
q ULTRA-SMALL PACKAGE: SOT23-8
q LOW dG/dφ : 0.05%/0.03°
q HIGH SLEW RATE: 335V/µsec
q SUPPLY VOLTAGE: ±3V to ±6V
APPLICATIONS
q A/D DRIVERS
q CONSUMER VIDEO
q ACTIVE FILTERS
q PULSE DELAY CIRCUITS
q LOW COST UPGRADE TO THE AD8056
OR EL2210
DESCRIPTION
The OPA2652 is a dual, low-cost, wideband voltage-
feedback amplifier intended for price sensitive applica-
tions. It features a high gain bandwidth product of 200MHz
on only 5.5mA/chan quiescent current. Intended for op-
eration on ±5V supplies, it will also support applications
on a single supply from +6V to +12V with 140mA output
current. Its classical differential input, voltage-feedback
design allows wide application in active filters, integra-
tors, transimpedance amplifiers, and differential receiv-
ers.
The OPA2652 is internally compensated for unity gain
stability. It has exceptional bandwidth (700MHz) as a unity
gain buffer, with little peaking (0dB typically). Excellent
DC accuracy is achieved with a low 1.5mV input offset
voltage and 300nA input offset current.
RELATED PRODUCTS
SINGLES
OPA650
OPA680
OPA631
OPA634
DUALS
OPA2650
OPA2680
OPA2631
OPA2634
TRIPLES
—
OPA3680
—
—
QUADS
OPA4650
—
—
—
NOTES
±5V Spec
+5V Capable
+3V Capable
+3V Capable
200Ω
–
VIN
133Ω
402Ω
+5V
1/2
OPA2652
200Ω
+
402Ω
133Ω
1/2
OPA2652
–5V
24.9Ω 0.1µF
24.9Ω 0.1µF
22pF
0.1µF
1.00kΩ
+In
CM
–In
1.00kΩ
22pF
+5V
ADS807
12-Bit
53MHz
Differential ADC Driver
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 2000 Burr-Brown Corporation
PDS-1588B
Printed in U.S.A. June, 2000
1 page TYPICAL PERFORMANCE CURVES: VS = ±5V (Cont.)
At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω, unless otherwise noted. See Figures 1 and 2.
HARMONIC DISTORTION vs NON-INVERTING GAIN
–50
VO = 2Vp-p
f = 5MHz
3rd Harmonic
–60
2nd Harmonic
–70
–80
–90
1
Gain Magnitude (V/V)
10
HARMONIC DISTORTION vs INVERTING GAIN
–50
VO = 2Vp-p
f = 5MHz
3rd Harmonic
–60
2nd Harmonic
–70
–80
–90
1
Gain Magnitude (V/V)
10
HARMONIC DISTORTION vs OUTPUT VOLTAGE
–50
f = 5MHz
–60
3rd Harmonic
–70
2nd Harmonic
–80
–90
0.1
1
Output Voltage (Vp-p)
4
HARMONIC DISTORTION vs FREQUENCY
–50
VO = 2Vp-p
–60
3rd Harmonic
–70
–80
–90
0.1
2nd Harmonic
1
Frequency (MHz)
10 20
HARMONIC DISTORTION vs LOAD RESISTANCE
–50
VO = 2Vp-p
f = 5MHz
–60
3rd Harmonic
–70
2nd Harmonic
–80
–90
100
RL (Ω)
1000
HARMONIC DISTORTION vs SUPPLY VOLTAGE
–50
VO = 2Vp-p
f = 5MHz
–60
3rd Harmonic
–70
2nd Harmonic
–80
–90
±3
±4 ±5
Supply Voltage (V)
±6
®
5 OPA2652
5 Page C
VIN
R
+5V
1/2
OPA2652
RG
402Ω
–5V
RF
402Ω
C
R
402Ω
+5V
1/2
OPA2652
–5V
402Ω
VO
FIGURE 6. Pulse Delay Circuit.
RF and RG need to be equal to maintain a constant gain
magnitude. The rise and fall times of the input pulses (tr(IN) )
should be slow enough to prevent pre-shoot artifacts in the
response.
tr(IN) ≥ 5RC, minimal pre-shoot
SIMPLE BANDPASS FILTER
Figure 7 shows the OPA2652 used as simple bandpass filter.
The OPA2652 is well suited for this type of circuit because
it is very stable at a noise gain of +1.
C2
MACROMODELS AND APPLICATIONS SUPPORT
Computer simulation of circuit performance using SPICE is
often useful when analyzing the performance of analog
circuits and systems. This is particularly true for Video and
RF amplifier circuits where parasitic capacitance and induc-
tance can have a major effect on circuit performance. Check
the Burr-Brown web site (www.burr-brown.com) for avail-
able SPICE products (not all parts have models). These
models do a good job of predicting small-signal AC and
transient performance under a wide variety of operating
conditions. They do not do as well in predicting the har-
monic distortion or dG/dφ characteristics. These models do
not attempt to distinguish between the package types in their
small-signal AC performance.
C1 402Ω
VIN
402Ω
+5V
VOUT
OPERATING SUGGESTIONS
OPTIMIZING RESISTOR VALUES
Since the OPA2652 is a unity gain stable voltage feedback
op amp, a wide range of resistor values may be used for the
1/2
OPA2652
feedback and gain setting resistors. The primary limits on
these values are set by dynamic range (noise and distortion)
and parasitic capacitance considerations. For a non-inverting
402Ω
–5V
unity gain follower application, the feedback connection
should be made with a 25Ω resistor, not a direct short. This
will isolate the inverting input capacitance from the output
pin and improve the frequency response flatness. Usually,
FIGURE 7. Inverting Bandpass Filter.
the feedback resistor value should be between 200Ω and
1.5kΩ. Below 200Ω, the feedback network will present
DESIGN-IN TOOLS
additional output loading which can degrade the harmonic
distortion performance of the OPA2652. Above 1.5kΩ, the
DEMONSTRATION BOARDS
PC boards are available to assist in the initial evaluation of
circuit performance using the OPA2652. They are available
free as unpopulated PC boards delivered with descriptive
documentation. The summary information for these boards is
shown below:
typical parasitic capacitance (approximately 0.2pF) across
the feedback resistor may cause unintentional band-limiting
in the amplifier response.
A good rule of thumb is to target the parallel combination of
RF and RG (Figure 1) to be less than approximately 300Ω.
The combined impedance RF || RG interacts with the invert-
ing input capacitance, placing an additional pole in the
feedback network, and thus a zero in the forward response.
PRODUCT
OPA2652U
OPA2652E
PACKAGE
8-Lead SO-8
SOT23-8
BOARD
PART
NUMBER
DEM-OPA26xU
DEM-OPA2652E
ORDERING
NUMBER
MKT-352
MKT-365
Contact the Burr-Brown Applications support line to request
this board.
Assuming a 2pF total parasitic on the inverting node, hold-
ing RF || RG < 300Ω will keep this pole above 250MHz. By
itself, this constraint implies that the feedback resistor RF
can increase to several kΩ at high gains. This is acceptable
as long as the pole formed by RF and any parasitic capaci-
tance appearing in parallel is kept out of the frequency range
of interest.
®
11 OPA2652
11 Page |
Páginas | Total 15 Páginas | |
PDF Descargar | [ Datasheet OPA2652.PDF ] |
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