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PDF OPA690 Data sheet ( Hoja de datos )

Número de pieza OPA690
Descripción Low-Power / Single-Supply / Wideband Operational Amplifier
Fabricantes Burr-Brown 
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No Preview Available ! OPA690 Hoja de datos, Descripción, Manual

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OPA690
OPA690
OPA690
SBOS223A—DECEMBER 2001 – REVISED JULY 2002
Wideband, Voltage Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
q FLEXIBLE SUPPLY RANGE:
+5V to +12V Single Supply
±2.5V to ±5V Dual Supply
q UNITY-GAIN STABLE: 500MHz (G = 1)
q HIGH OUTPUT CURRENT: 190mA
q OUTPUT VOLTAGE SWING: ±4.0V
q HIGH SLEW RATE: 1800V/µs
q LOW SUPPLY CURRENT: 5.5mA
q LOW DISABLED CURRENT: 100µA
q WIDEBAND +5V OPERATION: 220MHz (G = 2)
APPLICATIONS
q VIDEO LINE DRIVER
q xDSL LINE DRIVER/RECEIVER
q HIGH SPEED IMAGING CHANNELS
q ADC BUFFERS
q PORTABLE INSTRUMENTS
q TRANSIMPEDANCE AMPLIFIERS
q ACTIVE FILTERS
q OPA680 UPGRADE
DESCRIPTION
The OPA690 represents a major step forward in unity-gain
stable, voltage feedback op amps. A new internal architec-
ture provides slew rate and full-power bandwidth previously
found only in wideband current feedback op amps. A new
output stage architecture delivers high currents with a
minimal headroom requirement. These combine to give
exceptional single-supply operation. Using a single +5V
supply, the OPA690 can deliver a 1V to 4V output swing
with over 150mA drive current and 150MHz bandwidth.
This combination of features makes the OPA690 an ideal
RGB line driver or single-supply Analog-to-Digital Con-
verter (ADC) input driver.
+5V
R1
R1 2.5V
0.1µF
3
8
C1 R2
VI
OPA690
2
4
C2
R3 C4
10µF
C5
0.1µF
The OPA690’s low 5.5mA supply current is precisely trimmed
at 25°C. This trim, along with low temperature drift, gives
lower maximum supply current than competing products.
System power may be reduced further using the optional
disable control pin. Leaving this disable pin open, or holding
it HIGH, will operate the OPA690 normally. If pulled LOW,
the OPA690 supply current drops to less than 100µA while
the output goes to a high impedance state. This feature may
be used for power savings.
OPA690 RELATED PRODUCTS
Voltage Feedback
Current Feedback
Fixed Gain
SINGLES
OPA680
OPA691
OPA692
DUALS
OPA2690
OPA2691
OPA2682
3.3V
R4
20
THS1040
AIN+
C3
R5
20
20pF
10-Bit
40MSPS
AIN
C6
20pF
VREF = 1V
TRIPLES
OPA3690
OPA3691
OPA3692
Single-Supply ADC 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.
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

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OPA690 pdf
TYPICAL CHARACTERISTICS: VS = ±5V
At TA = +25°C, G = +2, RF = 402, and RL = 100, (see Figure 1 for AC performance only), unless otherwise noted.
SMALL-SIGNAL FREQUENCY RESPONSE
6
VO = 0.5Vp-p
G = +1
3 RF = 25
0
G=2
G=5
3
6
G = 10
9
12
15
0.7
10 100
Frequency (MHz)
700
LARGE-SIGNAL FREQUENCY RESPONSE
9
6
3
0
3
6
0.5 1
VO = 2Vp-p
VO = 1Vp-p
VO = 4Vp-p
VO = 7Vp-p
10
Frequency (MHz)
100
500
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
G = +2
+3 VO = 5Vp-p
+2
+1
0
1
2
3
4
Time (5ns/div)
0.2
0.175
0.15
0.125
0.1
0.075
COMPOSITE VIDEO dG/dP
Video In
75
+5V
OPA690
402
402
Optional
1.3k
Pull-Down
5V
No Pull-Down
With 1.3kPull-Down
dG
dG
dP
0.05
0.025
dP
0
123 4
Number of 150Loads
DISABLE FEEDTHROUGH vs FREQUENCY
45
50 VDIS = 0
55
60
65
70
75
80
85
90 Reverse
95
100
100k
Forward
1M
10M
Frequency (Hz)
100M
OPA690
SBOS223A
www.ti.com
5

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OPA690 arduino
APPLICATIONS INFORMATION
WIDEBAND VOLTAGE FEEDBACK OPERATION
The OPA690 provides an exceptional combination of high
output power capability with a wideband, unity-gain stable
voltage feedback op amp using a new high slew rate input
stage. Typical differential input stages used for voltage feed-
back op amps are designed to steer a fixed-bias current to
the compensation capacitor, setting a limit to the achievable
slew rate. The OPA690 uses a new input stage which places
the transconductance element between two input buffers,
using their output currents as the forward signal. As the error
voltage increases across the two inputs, an increasing cur-
rent is delivered to the compensation capacitor. This pro-
vides very high slew rate (1800V/µs) while consuming
relatively low quiescent current (5.5mA). This exceptional
full-power performance comes at the price of a slightly higher
input noise voltage than alternative architectures. The
5.5nV/Hzinput voltage noise for the OPA690 is exception-
ally low for this type of input stage.
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 50with a resistor to
ground and the output impedance is set to 50with a series
output resistor. Voltage swings reported in the specifications
are taken directly at the input and output pins, while output
powers (dBm) are at the matched 50load. For the circuit of
Figure 1, the total effective load will be 100|| 804. The
disable control line is typically left open to ensure normal
amplifier operation. Two optional components are included in
Figure 1. An additional resistor (175) is included in series
with the noninverting input. Combined with the 25DC
source resistance looking back towards the signal generator,
this gives an input bias current cancelling resistance that
matches the 200source resistance seen at the inverting
input (see the DC Accuracy and Offset Control section). In
addition to the usual power-supply decoupling capacitors to
ground, a 0.1µF 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.
Figure 2 shows the AC-coupled, gain of +2, single-supply
circuit configuration which is the basis of the +5V Specifica-
tions and Typical Characteristics. Though not a rail-to-rail
design, the OPA690 requires minimal input and output volt-
age headroom compared to other very wideband voltage
feedback op amps. It will deliver a 3Vp-p output swing on
a single +5V supply with > 150MHz bandwidth. The key
requirement of broadband single-supply operation is to main-
tain input and output signal swings within the useable 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 698resistors). The input
signal is then AC-coupled into the 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 (59)
used for testing is adjusted to give a 50input load when the
parallel combination of the biasing divider network is in-
cluded. Again, an additional resistor (50in this case) is
included directly in series with the noninverting input. This
minimum recommended value provides part of the DC source
resistance matching for the noninverting input bias current. It
is also used to form a simple parasitic pole to roll off the
frequency response at very high frequencies (> 500MHz)
using the input parasitic capacitance to form a bandlimiting
pole. The gain resistor (RG) is AC-coupled, giving the circuit
a DC gain of +1, which puts the input DC bias voltage (2.5V)
at the output as well. The output voltage can swing to within
+5V
0.1µF
6.8µF
+
50Source
175
VI 50
OPA690
DIS
50Load
VO 50
0.1µF
RG
402
RF
402
+ 6.8µF
5V
0.1µF
FIGURE 1. DC-Coupled, G = +2, Bipolar Supply, Specifica-
tion and Test Circuit.
+5V
+VS
50Source
0.1µF
VI 59
698
50
698
+
0.1µF
6.8µF
OPA690
DIS
VO 100
RF
402
VS/2
RG
402
0.1µF
FIGURE 2. AC-Coupled, G = +2, Single-Supply, Specifica-
tion and Test Circuit.
OPA690
SBOS223A
www.ti.com
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