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OPA684 Datasheet(PDF) 10 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part # OPA684
Description  Wideband, Low-Power, Current Feedback Operational Amplifier
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

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OPA694
SBOS319C − SEPTEMBER 2004 − REVISED NOVEMBER 2004
www.ti.com
10
APPLICATION INFORMATION
WIDEBAND CURRENT FEEDBACK OPERATION
The OPA694 provides exceptional AC performance for a
wideband,
low-power,
current-feedback
operational
amplifier. Requiring only 5.8mA quiescent current, the
OPA694 offers a 690MHz bandwidth at a gain of +2, along
with a 1700V/
µs slew rate. An improved output stage
provides
±80mA output drive, along with < 1.5V output
voltage headroom. This combination of low power and
high
bandwidth
can
benefit
high-resolution
video
applications.
Figure 1 shows the DC-coupled, gain of +2, dual power-
supply circuit configuration used as the basis of the
±5V
Electrical Characteristic tables and Typical Characteristic
curves. For test purposes, the input impedance is set to
50
Ω with a resistor to ground and the output impedance is
set to 50
Ω with a series output resistor. Voltage swings
reported in the Electrical Charateristics are taken directly
at the input and output pins, while load powers (dBm) are
defined at a matched 50
Ω load. For the circuit of Figure 1,
the total effective load will be 100
Ω || 804Ω = 89Ω. One
optional component is included in Figure 1. In addition to
the usual power-supply decoupling capacitors to ground,
a
0.1
µF capacitor is included between the two
power-supply pins. In practical PC board layouts, this
optional added capacitor will typically improve the
2nd-harmonic distortion performance by 3dB to 6dB.
OPA694
+5V
+
−5V
−V
S
+V
S
50
ΩLoad
50
50
V
O
V
I
50
ΩSource
R
G
402
R
F
402
6.8
µF
0.1
µF6.8µF
0.1
µF
0.1
µF
Figure 1. DC-Coupled, G = +2, Bipolar-Supply
Specification and Test Circuit
Figure 2 shows the DC-coupled, gain of −2V/V, dual
power-supply circuit used as the basis of the inverting
Typical Characteristic curves. Inverting operation offers
several
performance
benefits.
Since
there
is
no
common-mode signal across the input stage, the slew rate
for inverting operation is higher and the distortion
performance is slightly improved. An additional input
resistor, RT, is included in Figure 2 to set the input
impedance equal to 50
Ω. The parallel combination of RT
and RG sets the input impedance. Both the noninverting
and inverting applications of Figure 1 and Figure 2 will
benefit from optimizing the feedback resistor (RF) value for
bandwidth (see the discussion in Setting Resistor Values
to Optimize Bandwidth). The typical design sequence is to
select the RF value for best bandwidth, set RG for the gain,
then set RT for the desired input impedance. As the gain
increases for the inverting configuration, a point will be
reached where RG will equal 50Ω, where RT is removed
and the input match is set by RG only. With RG fixed to
achieve an input match to 50
Ω, RF is simply increased, to
increase gain. This will, however, quickly reduce the
achievable bandwidth, as shown by the inverting gain of
–10 frequency response in the Typical Characteristic
curves. For gains > 10V/V (14dB at the matched load),
noninverting operation is recommended to maintain
broader bandwidth.
OPA694
+5V
+V
S
−V
S
−5V
50
ΩLoad
50
20
R
T
66.5
R
G
200
6.8
µF
0.1
µF
6.8
µF
0.1
µF
Optional
0.01
µF
V
I
50
ΩSource
R
F
402
V
O
Figure 2. DC-Coupled, G = −2V/V, Bipolar-Supply
Specification and Test Circuit


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