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PDF OPA3691 Data sheet ( Hoja de datos )
| Número de pieza | OPA3691 | |
| Descripción | Current-Feedback OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
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OPA3691
OPA3691
OPA3691
SBOS227A – DECEMBER 2001 – REVISED OCTOBER 2002
Triple Wideband, Current-Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
q FLEXIBLE SUPPLY RANGE:
+5V to +12V Single-Supply
±2.5V to ±6V Dual Supply
q UNITY-GAIN STABLE: 280MHz (G = 1)
q HIGH OUTPUT CURRENT: 190mA
q OUTPUT VOLTAGE SWING: ±4.0V
q HIGH SLEW RATE: 2100V/µs
q LOW SUPPLY CURRENT: 5.1mA/ch
q LOW DISABLED CURRENT: 150µA/ch
q IMPROVED HIGH-FREQUENCY PINOUT
q WIDEBAND +5V OPERATION: 190MHz (G = +2)
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
+5V
V1 1/3
OPA3691
–5V
301Ω
66.5Ω
301Ω
250Ω
250Ω
+5V
1/3
OPA3691
10 (V1 – V2)
–5V
499Ω
+5V
499Ω
1/3
OPA3691
V2
–5V High-Speed INA (120MHz)
DESCRIPTION
The OPA3691 sets a new level of performance for broad-
band, triple current-feedback op amps. Operating on a very
low 5.1mA/ch supply current, the OPA3691 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 head-
room and crossover distortion. This gives exceptional single-
supply operation. Using a single +5V supply, the OPA3691
can deliver a 1V to 4V output swing with over 120mA drive
current and 150MHz bandwidth. This combination of fea-
tures makes the OPA3691 an ideal RGB line driver or
single-supply Analog-to-Digital Converter (ADC) input driver.
The OPA3691’s low 5.1mA/ch supply current is precisely
trimmed at 25°C. This trim, along with low drift over tem-
perature, ensures lower maximum supply current than com-
peting 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 OPA3691 supply current drops to less than
150µA/ch while the output goes into a high impedance
state. This feature may be used for power savings.
OPA3691 RELATED PRODUCTS
Voltage-Feedback
Current-Feedback
Fixed Gain
SINGLES
OPA690
OPA691
OPA692
DUALS
OPA2690
OPA2691
—
TRIPLES
OPA3690
OPA3681
OPA3692
HIGH-SPEED INA FREQUENCY RESPONSE
25
20
15
10
5
0
0.1
1 10 100 400
Frequency (MHz)
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2001, Texas Instruments Incorporated
1 page  
TYPICAL CHARACTERISTICS: VS = ±5V
TA = +25°C, G = +2, and RL = 100Ω, (see Figure 1 for AC performance only), unless otherwise noted.
SMALL-SIGNAL FREQUENCY RESPONSE
1
G = +1, RF = 453Ω
0 G = +2,
–1 RF = 402Ω
–2
–3
–4
G = +5, RF = 261Ω
–5
–6 G = +10, RF = 180Ω
–7
–8
0
VO = 0.5Vp-p
125MHz
Frequency (25MHz/div)
250MHz
LARGE-SIGNAL FREQUENCY RESPONSE
7.0
G = +2, RL = 100Ω
6.5 2Vp-p 1Vp-p
6.0
5.5
5.0
4.5
4.0
3.5
4Vp-p
3.0
7Vp-p
2.5
2.0
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)
0.2
0.18
0.16
0.14
0.12
0.1
COMPOSITE VIDEO dG/dP
Video
In
+5
1/3
OPA3691
402Ω
Video
Loads
402Ω
Optional 1.3kΩ
–5 Pull-Down
No Pull-Down
With 1.3kΩ Pull-Down
dG
dG
0.08
0.06 dP
0.04
0.02 dP
0
12 3
Number of 150Ω Loads
4
DISABLED FEEDTHROUGH vs FREQUENCY
–45
–50 VDIS = 0
–55
–60
–65
–70
–75
–80 Reverse
–85
–90
Forward
–95
–100
0.3
1
10
Frequency (MHz)
100
OPA3691
SBOS227A
www.ti.com
5
5 Page 
APPLICATIONS INFORMATION
WIDEBAND CURRENT-FEEDBACK OPERATION
The OPA3691 gives the exceptional AC performance of a
wideband current-feedback op amp with a highly linear, high-
power output stage. Requiring only 5.1mA/ch quiescent
current, the OPA3691 will swing to within 1V of either supply
rail and deliver in excess of 160mA at room temperature.
This low output headroom requirement, along with supply
voltage independent biasing, gives remarkable single (+5V)
supply operation. The OPA3691 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 OPA3691 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 independent of signal gain.
Figure 1 shows the DC-coupled, gain of +2, dual power-
supply circuit configuration used as the basis of the ±5V
Electrical Characteristics and Typical Characteristics. 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
electrical characteristics 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 ensure normal amplifier operation. One
optional component is included in Figure 1. In addition to the
usual power-supply decoupling capacitors to ground, a 0.01µF
capacitor is included between the two power-supply pins. In
practical PC board layouts, this optionally added capacitor
will typically improve the 2nd-harmonic distortion perfor-
mance 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 Characteristics. Though not a “rail-to-rail”
design, the OPA3691 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 be-
tween the supply pins. The input impedance matching resis-
tor (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 120mA output current.
A demanding 100Ω load to a midpoint bias is used in this
characterization circuit. The new output stage used in the
OPA3691 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
OPA3691
DIS
50Ω Load
VO 50Ω
0.01µF
RF
499Ω
RG
499Ω
–VS
–5V
+ 6.8µF
0.1µF
+5V
+VS
0.1µF
806Ω
+
0.1µF
6.8µF
DIS
VI 57.6Ω 806Ω 1/3
VO 100Ω
OPA3691
VS/2
RF
499Ω
RG
499Ω
0.1µF
FIGURE 1. DC-Coupled, G = +2, Bipolar Supply, Specifica-
tion and Test Circuit.
FIGURE 2. AC-Coupled, G = +2, Single-Supply, Specifica-
tion and Test Circuit.
OPA3691
SBOS227A
www.ti.com
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet OPA3691.PDF ] | |
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