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Número de pieza | OPA2694 | |
Descripción | Wideband / Low-Power / Current Feedback Operational Amplifier | |
Fabricantes | Burr-Brown | |
Logotipo | ||
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No Preview Available ! OPA694
SBOS319C − SEPTEMBER 2004 − REVISED NOVEMBER 2004
Wideband, Low-Power, Current Feedback
Operational Amplifier
FEATURES
D UNITY GAIN STABLE BANDWIDTH: 1.5GHz
D HIGH GAIN OF 2V/V BANDWIDTH: 690MHz
D LOW SUPPLY CURRENT: 5.8mA
D HIGH SLEW RATE: 1700V/µsec
D HIGH FULL-POWER BANDWIDTH: 675MHz
D LOW DIFFERENTIAL GAIN/PHASE:
0.03%/0.0155
D Pb-FREE AND GREEN SOT23-5 PACKAGE
APPLICATIONS
D WIDEBAND VIDEO LINE DRIVER
D MATRIX SWITCH BUFFER
D DIFFERENTIAL RECEIVER
D ADC DRIVER
D IMPROVED REPLACEMENT FOR OPA658
RELATED PRODUCTS
SINGLES
—
OPA683
OPA684
OPA691
OPA695
DUALS
OPA2694
OPA2683
OPA2684
OPA2691
OPA2695
TRIPLES
—
—
OPA3684
OPA3691
OPA3695
QUADS
—
—
OPA4684
—
—
FEATURES
Dual Version
Low-Power, CFBplus
Low-Power, CFBplus
High Output
High Intercept
DESCRIPTION
The OPA694 is an ultra-wideband, low-power, current
feedback operational amplifier featuring high slew rate and
low differential gain/phase errors. An improved output
stage provides ±80mA output drive with < 1.5V output
voltage headroom. Low supply current with > 500MHz
bandwidth meets the requirements of high density video
routers. Being a current feedback design, the OPA694
holds its bandwidth to very high gains—at a gain of 10, the
OPA694 will still provide 200MHz bandwidth.
RF applications can use the OPA694 as a low-power SAW
pre-amplifier. Extremely high 3rd-order intercept is
provided through 70MHz at much lower quiescent power
than many typical RF amplifiers.
The OPA694 is available in an industry-standard pinout in
both SO-8 and SOT23-5 packages.
+5V
VIN
75Ω OPA694
75Ω
VLOAD
RG− 59
402Ω
75Ω
402Ω −5V
Gain 2V/V Video Line Driver
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.
All trademarks are the property of their respective owners.
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.
Copyright 2004, Texas Instruments Incorporated
www.ti.com
1 page www.ti.com
TYPICAL CHARACTERISTICS: VS = ±5V
At RF = 402Ω, RL = 100Ω, and G = +2V/V, unless otherwise noted.
NONINVERTING SMALL−SIGNAL
FREQUENCY RESPONSE
3
VO = 0.5VPP
G = +2V/V
RL = 100Ω
0 RF = 402Ω
−3
−6
G = +10V/V
RF = 178Ω
−9
See Figure 1
−12
0 700
G = +5V/V
RF = 318Ω
400 600
Frequency (MHz)
800
1000
OPA694
SBOS319C − SEPTEMBER 2004 − REVISED NOVEMBER 2004
INVERTING SMALL−SIGNAL
FREQUENCY RESPONSE
3
0
G = −5V/V
RF = 318Ω
VO = 0.5VPP
RL = 100Ω
−3 G = −1V/V
RF = 430Ω
−6
G = −10V/V
−9 RF = 500Ω
−12
−15
See Figure 2
−18
0 200
G = −2V/V
RF = 402Ω
400 600
Frequency (MHz)
800
1000
NONINVERTING LARGE−SIGNAL
FREQUENCY RESPONSE
9
VO = 1VPP G = +2V/V
6 RF = 402Ω
3
0
−3 VO = 2VPP
−6
−9
See Figure 1
−12
0 200
VO = 7VPP
400 600
Frequency (MHz)
VO = 4VPP
800 1000
INVERTING LARGE−SIGNAL
FREQUENCY RESPONSE
9
6
VO = 4VPP VO = 2VPP
3
0
−3
−6
G = −2V/V
−9 RF = 402Ω
See Figure 2
−12
0 200
VO = 1VPP
VO = 7VPP
400 600
Frequency (MHz)
800
1000
3
G = +2V/V
2
1
0
−1
−2
−3
NONINVERTING
PULSE RESPONSE
Large Signal, 5VPP
Left Scale
Small Signal, 0.5VPP
Right Scale
See Figure 1
0.6
0.4
0.2
0
−0.2
−0.4
Time (5ns/div)
−0.6
3
G = −2V/V
2
1
0
−1
−2
−3
INVERTING
PULSE RESPONSE
Large Signal, 5VPP
Left Scale
Small Signal, 0.5VPP
Right Scale
See Figure 2
0.6
0.4
0.2
0
−0.2
−0.4
Time (5ns/div)
−0.6
5
5 Page OPA694
www.ti.com
ADC DRIVER
Most modern, high-performance analog-to-digital
converters (ADCs), such as Texas Instruments ADS522x
series, require a low-noise, low-distortion driver. The
OPA694 combines low-voltage noise (2.1nV/√Hz) with low
harmonic distortion. Figure 3 shows an example of a
wideband, AC-coupled, 12-bit ADC driver.
Two OPA694s are used in the circuit of Figure 3 to form a
differential driver for the ADS5220. The two OPA694s offer
> 250MHz bandwidth at a differential gain of 5V/V, with a
2VPP output swing. A 2nd-order RLC filter is used in order
to limit the noise from the amplifier and provide some
attenuation for higher-frequency harmonic distortion.
WIDEBAND INVERTING SUMMING AMPLIFIER
Since the signal bandwidth for a current-feedback op amp
can be controlled independently of the noise gain (NG,
which is normally the same as the noninverting signal
SBOS319C − SEPTEMBER 2004 − REVISED NOVEMBER 2004
gain), wideband inverting summing stages may be
implemented using the OPA694. The circuit in Figure 4
shows an example inverting summing amplifier, where the
resistor values have been adjusted to maintain both
maximum bandwidth and input impedance matching. If
each RF signal is assumed to be driven from a 50Ω source,
the NG for this circuit will be (1 + 100Ω/(100Ω/5)) = 6. The
total feedback impedance (from VO to the inverting error
current) is the sum of RF + (RI • NG). where RI is the
impedance looking into the inverting input from the
summing junction (see the Setting Resistor Values to
Optimize Performance section). Using 100Ω feedback (to
get a signal gain of –2 from each input to the output pin)
requires an additional 30Ω in series with the inverting input
to increase the feedback impedance. With this resistor
added to the typical internal RI = 30Ω, the total feedback
impedance is 100Ω + (60Ω • 6) = 460Ω, which is equal to
the required value to get a maximum bandwidth flat
frequency response for NG = 6.
Power−supply decoupling not shown.
+5V
25Ω OPA694
VI
50Ω
1:2 100Ω
100Ω
500Ω
500Ω
C1 R1
L
Single−to−Differential
Gain of 10
OPA694
25Ω
−5V
C1 R1
L
V+
C R2
0.1µF
VCM
R2
12−Bit
40MSPS
ADS5220
V−
Figure 3. Wideband, AC-Coupled, Low-Power ADC Driver
50Ω
V1
50Ω
V2
50Ω
V3
50Ω
V4
50Ω
V5
+5V
DIS
OPA694
30Ω 100Ω
−5V
50Ω
RG−58
VO = −(V1 + V2 + V3 + V4 + V5)
50Ω
100MHz, −1dB Compression = 15dBm
Figure 4. 200MHz RF Summing Amplifier
11
11 Page |
Páginas | Total 24 Páginas | |
PDF Descargar | [ Datasheet OPA2694.PDF ] |
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