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PDF OPA3681 Data sheet ( Hoja de datos )
| Número de pieza | OPA3681 | |
| Descripción | Triple Wideband / Current-Feedback OPERATIONAL AMPLIFIER With Disable | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA3681 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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®
OPA3681
OPA3681
OPA3681
For most current data sheet and other product
information, visit www.burr-brown.com
TM Triple Wideband, Current-Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
DESCRIPTION
q WIDEBAND +5V OPERATION: 225MHz (G = +2)
q UNITY GAIN STABLE: 280MHz (G = 1)
q HIGH OUTPUT CURRENT: 150mA
q OUTPUT VOLTAGE SWING: ±4.0V
q HIGH SLEW RATE: 2100V/µs
q LOW SUPPLY CURRENT: 6mA/ch
q LOW DISABLED CURRENT: 300µA/ch
q IMPROVED HIGH FREQUENCY PINOUT
APPLICATIONS
q RGB AMPLIFIERS
q WIDEBAND INA
q BROADBAND VIDEO BUFFERS
q HIGH SPEED IMAGING CHANNELS
q PORTABLE INSTRUMENTS
q ADC BUFFERS
q ACTIVE FILTERS
q CABLE DRIVERS
+5
V1 1/3
OPA3681
–5
250Ω
+5
The OPA3681 sets a new level of performance for broadband
triple current-feedback op amps. Operating on a very low
6mA/ch supply current, the OPA3681 offers a slew rate and
output power normally associated with a much higher supply
current. A new output stage architecture delivers a high output
current with minimal voltage headroom and crossover distor-
tion. This gives exceptional single-supply operation. Using a
single +5V supply, the OPA3681 can deliver a 1V to 4V output
swing with over 100mA drive current and 150MHz bandwidth.
This combination of features makes the OPA3681 an ideal RGB
line driver or single-supply ADC input driver.
The OPA3681’s low 6mA/ch supply current is precisely trimmed
at 25°C. This trim, along with low drift over temperature,
guarantees lower guaranteed maximum supply current than
competing products. System power may be further reduced by
using the optional disable control pin. Leaving this disable pin
open, or holding it high, gives normal operation. If pulled low,
the OPA3681 supply current drops to less than 300µA/ch while
the output goes into a high impedance state. This feature may be
used for power savings or for video MUX applications.
OPA3681 RELATED PRODUCTS
Voltage Feedback
Current Feedback
Fixed Gain
SINGLES
OPA680
OPA681
OPA682
DUALS
OPA2680
OPA2681
OPA2682
TRIPLES
OPA3680
OPA3681
OPA3682
DIFFERENTIAL TO SINGLE-ENDED
FREQUENCY RESPONSE
26
301Ω
66.5Ω
301Ω
250Ω
1/3
OPA3681
10 (V1 – V2)
–5
499Ω
23
20
17
14
f–3dB
+5 499Ω
11
1/3
OPA3681
V2
–5 High Speed INA (>120MHz)
8
5
0.1M
1M 10M 100M
Frequency (Hz)
1G
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
©1999 Burr-Brown Corporation
PDS-1452B
Printed in U.S.A. September, 1999
1 page  
TYPICAL PERFORMANCE CURVES: VS = ±5V
G = +2, RF = 499Ω, and RL = 100Ω, unless otherwise noted (see Figure 1).
SMALL-SIGNAL FREQUENCY RESPONSE
2
1
G = +1, RF = 549Ω
G = +2, RF = 499Ω
0
–1
VO = 0.5Vp-p
–2
–3
–4
–5 G = +5, RF = 365Ω
–6 G = +10, RF = 182Ω
–7
–8
0
125MHz
Frequency (25MHz/div)
250MHz
LARGE-SIGNAL FREQUENCY RESPONSE
8
7 G = +2, RL = 100Ω
6
5 2Vp-p
4
3
2 1Vp-p
4Vp-p
1
0 7Vp-p
–1
–2
0
125MHz
Frequency (25MHz/div)
250MHz
400
300
200
100
0
–100
–200
–300
–400
SMALL-SIGNAL PULSE RESPONSE
G = +2
VO = 0.5Vp-p
Time (5ns/div)
LARGE-SIGNAL PULSE RESPONSE
+4
+3 G = +2
VO = 5Vp-p
+2
+1
0
–1
–2
–3
–4
Time (5ns/div)
LARGE-SIGNAL DISABLE/ENABLE RESPONSE
5.0
4.0 VDIS
2.0
0
2.0 Output Voltage
1.6
1.2
0.8
0.4 G = +2
VIN = +1V
0
Time (50ns/div)
6.0
4.0
2.0
0
–20
–30
–40
–50
–60
–70
–80
–90
–100
0.3
ALL HOSTILE CROSSTALK
1 10 100 300
Frequency (MHz)
®
5 OPA3681
5 Page 
APPLICATIONS INFORMATION
WIDEBAND CURRENT-FEEDBACK OPERATION
The OPA3681 gives the exceptional AC performance of a
wideband current-feedback op amp with a highly linear,
high power output stage. Requiring only 6mA/ch quiescent
current, the OPA3681 will swing to within 1V of either
supply rail and deliver in excess of 135mA guaranteed at
room temperature. This low output headroom requirement,
along with supply voltage independent biasing, gives re-
markable single (+5V) supply operation. The OPA3681 will
deliver greater than 200MHz bandwidth driving a 2Vp-p
output into 100Ω on a single +5V supply. Previous boosted
output stage amplifiers have typically suffered from very
poor crossover distortion as the output current goes through
zero. The OPA3681 achieves a comparable power gain with
much better linearity. The primary advantage of a current-
feedback op amp over a voltage-feedback op amp is that AC
performance (bandwidth and distortion) is relatively inde-
pendent of signal gain.
Figure 1 shows the DC-coupled, gain of +2, dual power
supply circuit configuration used as the basis of the ±5V
Specifications and Typical Performance Curves. For test
purposes, the input impedance is set to 50Ω with a resistor
to ground and the output impedance is set to 50Ω with a
series output resistor. Voltage swings reported in the speci-
fications are taken directly at the input and output pins while
load powers (dBm) are defined at a matched 50Ω load. For
the circuit of Figure 1, the total effective load will be 100Ω
|| 998Ω. The disable control line (DIS) is typically left open
to guarantee normal amplifier operation. One optional com-
ponent is included in Figure 1. In addition to the usual power
supply de-coupling capacitors to ground, a 0.1µF capacitor
is included between the two power supply pins. In practical
PC board layouts, this optionally added capacitor will typi-
cally improve the 2nd harmonic distortion performance by
3dB to 6dB.
Figure 2 shows the AC-coupled, gain of +2, single-supply
circuit configuration used as the basis of the +5V Specifica-
tions and Typical Performance Curves. Though not a “rail-
to-rail” design, the OPA3681 requires minimal input and
output voltage headroom compared to other very wideband
current-feedback op amps. It will deliver a 3Vp-p output
swing on a single +5V supply with greater than 150MHz
bandwidth. The key requirement of broadband single-supply
operation is to maintain input and output signal swings
within the usable voltage ranges at both the input and the
output. The circuit of Figure 2 establishes an input midpoint
bias using a simple resistive divider from the +5V supply
(two 806Ω resistors). The input signal is then AC-coupled
into this midpoint voltage bias. The input voltage can swing
to within 1.5V of either supply pin, giving a 2Vp-p input
signal range centered between the supply pins. The input
impedance matching resistor (57.6Ω) used for testing is
adjusted to give a 50Ω input match when the parallel
combination of the biasing divider network is included. The
gain resistor (RG) is AC-coupled, giving the circuit a DC
gain of +1, which puts the input DC bias voltage (2.5V) on
the output as well. Again, on a single +5V supply, the output
voltage can swing to within 1V of either supply pin while
delivering more than 75mA output current. A demanding
100Ω load to a midpoint bias is used in this characterization
circuit. The new output stage used in the OPA3681 can
deliver large bipolar output currents into this midpoint load
with minimal crossover distortion, as shown by the +5V
supply, 3rd harmonic distortion plots.
+5V
0.1µF
+VS
6.8µF
+
50Ω Source
VI 50Ω
1/3
OPA3681
DIS
50Ω Load
VO 50Ω
0.1µF
RF
499Ω
RG
499Ω
–VS
–5V
+ 6.8µF
0.1µF
+5V
+VS
806Ω
+
0.1µF
6.8µF
0.1µF
DIS
VI 57.6Ω 806Ω 1/3
VO 100Ω
OPA3681
VS/2
RF
499Ω
RG
499Ω
0.1µF
FIGURE 1. DC-Coupled, G = +2, Bipolar Supply, Specifi-
cation and Test Circuit.
FIGURE 2. AC-Coupled, G = +2, Single Supply, Specifica-
tion and Test Circuit.
®
11 OPA3681
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet OPA3681.PDF ] | |
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