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Dual Wideband, Current-Feedback

OPERATIONAL AMPLIFIER With Disable

DESCRIPTION

The OPA2691 sets a new level of performance for broadband dual

current-feedback op amps. Operating on a very low 5.1mA/ch

supply current, the OPA2691 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 distortion. This gives exceptional

single-supply operation. Using a single +5V supply, the OPA2691

can deliver a 1V to 4V output swing with over 150mA drive current

and 190MHz bandwidth. This combination of features makes the

OPA2691 an ideal RGB line driver or single-supply Analog-to-Digital

Converter (ADC) input driver.

FEATURES

●

FLEXIBLE SUPPLY RANGE:

+5V to +12V Single Supply

2.5V to

6V Dual Supply

●

WIDEBAND +5V OPERATION: 190MHz (G = +2)

●

UNITY-GAIN STABLE: 280MHz (G = 1)

● HIGH OUTPUT CURRENT: 190mA

● OUTPUT VOLTAGE SWING:

±4.0V

● HIGH SLEW RATE: 2100V/

µs

● LOW SUPPLY CURRENT: 5.1mA/ch

● LOW DISABLED CURRENT: 150µA/ch

APPLICATIONS

● xDSL LINE DRIVER /RECEIVER

● MATCHED I/Q CHANNEL AMPLIFIER

● BROADBAND VIDEO BUFFERS

● HIGH-SPEED IMAGING CHANNELS

● PORTABLE INSTRUMENTS

● DIFFERENTIAL ADC DRIVERS

● ACTIVE FILTERS

● WIDEBAND INVERTING SUMMING

The OPA2691’s low 5.1mA/ch supply current is precisely trimmed at

25°C. This trim, along with low drift over temperature, ensures lower

maximum supply current than competing products. System power

may be further reduced by using the optional disable control pin

(SO-14 only). Leaving this disable pin open, or holding it HIGH,

gives normal operation. If pulled LOW, the OPA2691 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.

Single-Supply ADSL Upstream Driver

100Ω

2kΩ

1µF

12.4Ω

100Ω

2Vp-p

324Ω

1/2

OPA2691

1/2

OPA2691

+12V

1:2

15Vp-p

12.4Ω

+6.0V

OPA2691 RELATED PRODUCTS

SINGLES DUALS TRIPLES

Voltage-Feedback OPA690 OPA2690 OPA3690

Current-Feedback OPA691 OPA2681 OPA3691

Fixed Gain OPA692 — OPA3692

269

OPA2691

SBOS224D – DECEMBER 2001 – REVISED JULY 2008

www.ti.com

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.

Frequency (MHz)

0.1 1 10 100 200

SINGLE-SUPPLY ADSL UPSTREAM DRIVER

SMALL-SIGNAL FREQUENCY RESPONSE

Gain (dB)

All trademarks are the property of their respective owners.

Summary of content (30 pages)

PAGE 1
OPA2691 OPA 269 1 OPA 26 9 1 SBOS224D – DECEMBER 2001 – REVISED JULY 2008 www.ti.com Dual Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable FEATURES APPLICATIONS ● FLEXIBLE SUPPLY RANGE: +5V to +12V Single Supply ±2.5V to ±6V Dual Supply ● WIDEBAND +5V OPERATION: 190MHz (G = +2) ● UNITY-GAIN STABLE: 280MHz (G = 1) ● HIGH OUTPUT CURRENT: 190mA ● OUTPUT VOLTAGE SWING: ±4.0V ● HIGH SLEW RATE: 2100V/µs ● LOW SUPPLY CURRENT: 5.
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PACKAGE/ORDERING INFORMATION(1) PRODUCT OPA2691 " OPA2691 " PACKAGE-LEAD PACKAGE DESIGNATOR SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER TRANSPORT MEDIA, QUANTITY SO-8 D –40°C to +85°C OPA2691 " " " " OPA2691ID OPA2691IDR Rails, 100 Tape and Reel, 2500 SO-14 D –40°C to +85°C OPA2691 " " " " OPA2691I-14D OPA2691I-14DR Rails, 58 Tape and Reel, 2500 NOTE: (1) For the most current package and ordering information, see the Package Option Addendum at the end of this do
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ELECTRICAL CHARACTERISTICS: VS = ±5V Boldface limits are tested at +25°C. RF = 402Ω, RL = 100Ω, and G = +2, (see Figure 1 for AC performance only), unless otherwise noted. OPA2691ID, I-14D TYP AC PERFORMANCE (see Figure 1) Small-Signal Bandwidth (VO = 0.5Vp-p) Bandwidth for 0.1dB Gain Flatness Peaking at a Gain of +1 Large-Signal Bandwidth Slew Rate Rise-and-Fall Time Settling Time to 0.02% 0.
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ELECTRICAL CHARACTERISTICS: VS = +5V Boldface limits are tested at +25°C. RF = 453Ω, RL = 100Ω to VS/2, and G = +2, (see Figure 1 for AC performance only), unless otherwise noted. OPA2691ID, I-14D TYP +25°C(1) 0°C to 70°C(2) –40°C to +85°C(2) 168 160 140 40 1 30 2.5 25 3.0 600 575 550 –66 –73 –71 –77 1.7 12 15 –58 –65 –68 –72 2.5 14 17 –57 –63 –67 –70 2.9 15 18 200 ±0.8 ±3.5 100 +20 +40 ±5 ±20 Open-Loop 1.5 3.5 54 100 || 2 40 No Load RL = 100Ω, 2.5V No Load RL = 100Ω, 2.
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TYPICAL CHARACTERISTICS: VS = ±5V G = +2, RF = 402Ω, RL = 100Ω, unless otherwise noted (see Figure 1 for AC performance only). SMALL-SIGNAL FREQUENCY RESPONSE 1 G = +1, RF = 453Ω 0 –1 –3 G = +5, RF = 261Ω –5 G = +10, RF = 180Ω –6 2Vp-p 5.5 5.0 4.5 4.0 3.5 4Vp-p 3.0 –7 7Vp-p 2.5 VO = 0.5Vp-p –8 2.0 0 125MHz 250MHz 0 Frequency (25MHz/div) 250MHz LARGE-SIGNAL PULSE RESPONSE SMALL-SIGNAL PULSE RESPONSE +4 G = +2 VO = 0.
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TYPICAL CHARACTERISTICS: VS = ±5V (Cont.) G = +2, RF = 402Ω, RL = 100Ω, unless otherwise noted (see Figure 1 for AC performance only). HARMONIC DISTORTION vs LOAD RESISTANCE HARMONIC DISTORTION vs SUPPLY VOLTAGE –60 –60 Harmonic Distortion (dBc) Harmonic Distortion (dBc) VO = 2Vp-p RL = 100Ω f = 5MHz VO = 2Vp-p f = 5MHz –65 –70 2nd-Harmonic –75 –80 –85 3rd-Harmonic –90 –65 2nd-Harmonic –70 –75 3rd-Harmonic –80 –95 –100 –85 100 1000 2.
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TYPICAL CHARACTERISTICS: VS = ±5V (Cont.) G = +2, RF = 402Ω, RL = 100Ω, unless otherwise noted (see Figure 1 for AC performance only). 2-TONE, 3RD-ORDER INTERMODULATION SPURIOUS INPUT VOLTAGE AND CURRENT NOISE DENSITY –30 3rd-Order Spurious Level (dBc) Current Noise (pA/√Hz) Voltage Noise (nV/√Hz) 100 Inverting Input Current Noise (15pA/√Hz) 10 Noninverting Input Current Noise (12pA/√Hz) Voltage Noise (1.
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TYPICAL CHARACTERISTICS: VS = ±5V (Cont.) G = +2, RF = 402Ω, RL = 100Ω, unless otherwise noted (see Figure 1 for AC performance only). TYPICAL DC DRIFT OVER TEMPERATURE OUTPUT VOLTAGE AND CURRENT LIMITATIONS 2 Output Current Limit 1W Internal Power Limit Single Channel 1.
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TYPICAL CHARACTERISTICS: VS = +5V G = +2, RF = 499Ω, RL = 100Ω to +2.5V, unless otherwise noted (see Figure 2 for AC performance only). LARGE-SIGNAL FREQUENCY RESPONSE SMALL-SIGNAL FREQUENCY RESPONSE 1 7.0 G = +1, RF = 499Ω 6.0 –1 G = +2, RF = 453Ω –2 G = +5, RF = 340Ω –3 –4 –5 –6 –7 –8 5.5 5.0 VO = 2Vp-p 4.5 4.0 3.5 3.0 G = +10, RF = 180Ω VO = 0.5Vp-p VO = 0.5Vp-p 6.5 Gain (0.5dB/div) Normalized Gain (1dB/div) 0 2.
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TYPICAL CHARACTERISTICS: VS = +5V (Cont.) G = +2, RF = 499Ω, RL = 100Ω to +2.5V, unless otherwise noted (see Figure 2 for AC performance only). HARMONIC DISTORTION vs FREQUENCY HARMONIC DISTORTION vs LOAD RESISTANCE –50 –60 Harmonic Distortion (dBc) Harmonic Distortion (dBc) VO = 2Vp-p f = 5MHz –65 2nd-Harmonic –70 3rd-Harmonic –75 100 2nd-Harmonic –70 3rd-Harmonic –80 0.
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APPLICATIONS INFORMATION WIDEBAND CURRENT-FEEDBACK OPERATION The OPA2691 gives the exceptional AC performance of a wideband current-feedback op amp with a highly linear, highpower output stage. Requiring only 5.1mA/ch quiescent current, the OPA2691 will swing to within 1V of either supply rail and deliver in excess of 160mA tested at room temperature. This low output headroom requirement, along with supply voltage independent biasing, gives remarkable single (+5V) supply operation.
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SINGLE-SUPPLY DIFFERENTIAL ADC DRIVER WIDEBAND VIDEO MULTIPLEXING Figure 3 shows a gain of +10 Single-Ended In/Diff. Out singlesupply ADC driver. Using a dual amplifier like the OPA2691 helps reduce the necessary board space, as it also reduces the amount of required supply bypassing components. From a signal point of view, dual amplifiers provide excellent performance matching (for example, gain and phase matching). The differential ADC driver circuit shown in Figure 3 takes advantage of this fact.
PAGE 13
+5V 2kΩ VDIS +5V Power-supply decoupling not shown. Video 1 1/2 OPA2691 DIS 75Ω 82.5Ω –5V 340Ω 402Ω 75Ω Cable 340Ω RG-59 402Ω +5V 82.5Ω 1/2 OPA2691 Video 2 DIS 75Ω –5V 2kΩ FIGURE 4. Two-Channel Video Multiplexer. +5V 20MHz, 2ND-ORDER BUTTERWORTH LOW-PASS FREQUENCY RESPONSE Power-supply decoupling not shown. 0.1µF 12 5kΩ 100pF 8 VI 5kΩ 1/2 OPA2691 32.3Ω 105Ω 150pF 4 1/2 OPA2691 4VI Gain (dB) 51Ω 0 –4 375Ω 600Ω –8 125Ω –12 20MHz, 2nd-Order Butterworth Low-Pass 0.1 0.
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The 51Ω input matching resistor is optional in this case. The input signal is AC-coupled to the 2.5V DC reference voltage developed through the resistor divider from the +5V power supply. This first stage acts as a gain of +1 voltage buffer for the signal where the 600Ω feedback resistor is required for stability. This first stage easily drives the low input resistors required at the input of this high-frequency filter. The 2nd stage is set for a DC gain of +1—carrying the 2.
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MACROMODELS AND APPLICATIONS SUPPORT Computer simulation of circuit performance using SPICE is often useful when analyzing the performance of analog circuits and systems. This is particularly true for Video and RF amplifier circuits where parasitic capacitance and inductance can have a major effect on circuit performance. A SPICE model for the OPA2691 is available through the TI web site (www.ti.com).
PAGE 16
the bandwidth. Figure 8 shows the recommended RF versus NG for both ±5V and a single +5V operation. The values for RF versus Gain shown here are approximately equal to the values used to generate the Typical Characteristics. They differ in that the optimized values used in the Typical Characteristics are also correcting for board parasitics not considered in the simplified analysis leading to Equation 3.
PAGE 17
swing limit is within 1.2V of either rail. Into a 15Ω load (the minimum tested load), it is tested to deliver more than ±160mA. and adds a zero at a higher frequency. The additional zero acts to cancel the phase lag from the capacitive load pole, thus increasing the phase margin and improving stability. The specifications described above, though familiar in the industry, consider voltage and current limits separately.
PAGE 18
current noise terms to achieve low output noise. The inverting current noise (15pA/√Hz) is significantly lower than earlier solutions while the input voltage noise (1.7nV/√Hz) is lower than most unity-gain stable, wideband, voltage-feedback op amps. This low input voltage noise was achieved at the price of higher noninverting input current noise (12pA/√Hz).
PAGE 19
holding the emitter-base voltage of Q1 at approximately 0V. This shuts off the collector current out of Q1, turning the amplifier off. The supply currents in the disable mode are only those required to operate the circuit of Figure 11. Additional circuitry ensures that turn-on time occurs faster than turn-off time (make-before-break). When disabled, the output and input nodes go to a high impedance state.
PAGE 20
short as possible. Never use wirewound type resistors in a high-frequency application. Since the output pin and inverting input pin are the most sensitive to parasitic capacitance, always position the feedback and series output resistor, if any, as close as possible to the output pin. Other network components, such as noninverting input termination resistors, should also be placed close to the package.
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Revision History DATE REVISION 7/08 D 2/07 C PAGE SECTION 2 Abs Max Ratings 3, 4 Electrical Characteristics, Power Supply 8 Typical Characteristics DESCRIPTION Changed Storage Temperature Range from −40°C to +125C to −65°C to +125C. Added minimum supply voltage. Changed Closed-Loop Output Impedance vs Frequency plot. NOTE: Page numbers for previous revisions may differ from page numbers in the current version. OPA2691 SBOS224D www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant OPA2691I-14DR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 OPA2691IDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2691I-14DR SOIC D 14 2500 367.0 367.0 38.0 OPA2691IDR SOIC D 8 2500 367.0 367.0 35.
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