Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Voltage feedback SOIC 8

0.1 Fm

+5V

10pF

0.1 Fm

10pF

499W

Clock

REFT

REFB

ADS825

10-Bit

40MSPS

1/2

OPA2690

+5V

+2.5V

1/2

OPA2690

1kW

499W

35W

2kW100W

100pF

2kW

2.5V

HARMONICDISTORTIONvsFREQUENCY

FORTHESINGLE-SUPPLYADCDRIVER

HarmonicDistortion(dBc)

Frequency(MHz)

-50

-55

-60

-65

-70

-75

-80

-85

-90

-95

-100

1 10

3rd-Harmonic

2nd-Harmonic

2V DifferentialOutput

OPA2690

www.ti.com

SBOS238G –JUNE 2002–REVISED MARCH 2010

Dual, Wideband, Voltage-Feedback

OPERATIONAL AMPLIFIER with Disable

Check for Samples: OPA2690

FEATURES

DESCRIPTION

• FLEXIBLE SUPPLY RANGE:

The OPA2690 represents a major step forward in

+5V to +12V Single Supply

unity-gain stable, voltage-feedback op amps. A new

±2.5V to ±6V Dual Supply

internal architecture provides slew rate and full-power

bandwidth previously found only in wideband,

• WIDEBAND +5V OPERATION: 220MHz (G = 2)

current-feedback op amps. A new output stage

• HIGH OUTPUT CURRENT: 190mA

architecture delivers high currents with a minimal

• OUTPUT VOLTAGE SWING: ±4.0V

headroom requirement. These give exceptional

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

• HIGH SLEW RATE: 1800V/ms

the OPA2690 can deliver a 1V to 4V output swing

• LOW SUPPLY CURRENT: 5.5mA/ch

with over 120mA drive current and 150MHz

• LOW DISABLE CURRENT: 100mA/ch

bandwidth. This combination of features makes the

OPA2690 an ideal RGB line driver or single-supply

APPLICATIONS

Analog-to-Digital Converter (ADC) input driver.

• VIDEO LINE DRIVING

The low 5.5mA/ch supply current of the OPA2690 is

• xDSL LINE DRIVER/RECEIVER

precisely trimmed at +25°C. This trim, along with low

temperature drift, provides lower maximum supply

• HIGH-SPEED IMAGING CHANNELS

current than competing products. System power may

• ADC BUFFERS

be reduced further using the optional disable control

• PORTABLE INSTRUMENTS

pin. Leaving this disable pin open, or holding it HIGH,

• TRANSIMPEDANCE AMPLIFIERS

will operate the OPA2690I-14D normally. If pulled

• ACTIVE FILTERS

LOW, the OPA2690I-14D supply current drops to less

than 200mA/ch while the output goes to a

Single-Supply Differential ADC Driver

high-impedance state.

OPA2690 RELATED PRODUCTS

SINGLES DUALS TRIPLES

Voltage-Feedback OPA690 OPA2690 OPA3690

Current-Feedback OPA691 OPA2691 OPA3691

Fixed Gain OPA692 — OPA3692

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.

2All 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 the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (39 pages)

PAGE 1
OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 Dual, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable Check for Samples: OPA2690 FEATURES DESCRIPTION • The OPA2690 represents a major step forward in unity-gain stable, voltage-feedback op amps. A new internal architecture 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.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 ELECTRICAL CHARACTERISTICS: VS = ±5V Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω, and G = +2 (see Figure 36 for ac performance only), unless otherwise noted. OPA2690ID, I-14D MIN/MAX OVER TEMPERATURE TYP PARAMETER +25°C (2) 0°C to +70°C (3) -40°C to +85°C (3) 220 165 160 150 G = +10, VO = 0.5VPP 30 20 19 G ≥ 10 300 200 190 G = +2, VO < 0.5VPP 30 TEST CONDITIONS +25°C G = +1, VO = 0.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS = ±5V (continued) Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω, and G = +2 (see Figure 36 for ac performance only), unless otherwise noted. OPA2690ID, I-14D MIN/MAX OVER TEMPERATURE TYP PARAMETER TEST CONDITIONS +25°C +25°C (2) 0°C to +70°C (3) -40°C to +85°C (3) UNIT MIN/ MAX TEST LEVELS (1) OUTPUT Voltage Output Swing No Load ±4.0 ±3.8 ±3.7 ±3.6 V min A 100Ω Load ±3.9 ±3.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 ELECTRICAL CHARACTERISTICS: VS = +5V Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω to VS/2, and G = +2 (see Figure 37 for ac performance only), unless otherwise noted. OPA2690ID, I-14D MIN/MAX OVER TEMPERATURE TYP PARAMETER +25°C (2) 0°C to +70°C (3) -40°C to +85°C (3) 190 150 145 140 G = +10, VO < 0.5VPP 25 18 17 G ≥ 10 250 180 170 G = +2, VO < 0.5VPP 20 TEST CONDITIONS +25°C G = +1, VO = 0.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS = +5V (continued) Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω to VS/2, and G = +2 (see Figure 37 for ac performance only), unless otherwise noted. OPA2690ID, I-14D MIN/MAX OVER TEMPERATURE TYP PARAMETER TEST CONDITIONS +25°C +25°C (2) 0°C to +70°C (3) -40°C to +85°C (3) UNIT MIN/ MAX TEST LEVELS (1) OUTPUT Most Positive Output Voltage No Load 4 3.8 3.6 3.5 V min A RL = 100Ω to 2.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 TYPICAL CHARACTERISTICS: VS = ±5V At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω (see Figure 36 for ac performance only), unless otherwise noted. SMALL−SIGNAL FREQUENCY RESPONSE 9 6 VO = 0.5VPP G = +1 RF = 25W 3 6 0 G=5 -3 -6 VO = 2VPP Gain (3dB/div) Normalized Gain (dB) LARGE−SIGNAL FREQUENCY RESPONSE G=2 G = 10 3 VO = 1VPP 0 VO = 4VPP -9 -3 -12 VO = 7VPP -6 0.5 -15 0.7 1 10 700 100 1 Frequency (MHz) Figure 1. Figure 2.
PAGE 8
OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V (continued) At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω (see Figure 36 for ac performance only), unless otherwise noted.
PAGE 9
OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 TYPICAL CHARACTERISTICS: VS = ±5V (continued) At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω (see Figure 36 for ac performance only), unless otherwise noted. INPUT VOLTAGE AND CURRENT NOISE DENSITY TWO−TONE, 3RD−ORDER INTERMODULATION SPURIOUS -30 3rd-Order Spurious Level (dBc) Voltage Noise (nV/ÖHz) Current Noise (pA/ÖHz) 100 10 Voltage Noise 5.5nV/ÖHz Current Noise 3.
PAGE 10
OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com TYPICAL CHARACTERISTICS: VS = ±5V (continued) At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω (see Figure 36 for ac performance only), unless otherwise noted. OUTPUT VOLTAGE AND CURRENT LIMITATIONS 1 0 25W Load Line 50W Load Line -1 -2 100W Load Line -3 -4 -5 -300 -200 0 -100 100 200 0.5 Input Offset Current (IOS) 0 0 -0.5 -1.0 -10 Input Offset Voltage (VOS) -20 -2.0 -50 300 -25 0 25 50 75 100 Figure 19. Figure 20.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 TYPICAL CHARACTERISTICS: VS = ±5V (continued) At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω (see Figure 36 for ac performance only), unless otherwise noted. 5 10 4 8 3 6 2 4 1 Output Voltage 2 0 0 -1 -2 -2 -4 -3 -4 Input Voltage -5 Output Voltage (V) Input Voltage (V) NONINVERTING OVERDRIVE RECOVERY -6 -8 -10 Time (10ns/div) Figure 25.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com TYPICAL CHARACTERISTICS: +5V At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω (see Figure 37 for ac performance only), unless otherwise noted. SMALL−SIGNAL FREQUENCY RESPONSE 6 LARGE−SIGNAL FREQUENCY RESPONSE 9 VO = 0.5VPP 3 6 VO = 3VPP G = +2 0 3 G = +5 Gain (dB) Normalized Gain (dB) VO = 2VPP G = +1 RF = 25W -3 VO = 1VPP 0 G = +10 -6 -3 -9 -6 0.7 1 100 10 700 0.5 1 Figure 26. Figure 27.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 TYPICAL CHARACTERISTICS: +5V (continued) At TA = +25°C, G = +2, RF = 402Ω, and RL = 100Ω (see Figure 37 for ac performance only), unless otherwise noted. HARMONIC DISTORTION vs LOAD RESISTANCE HARMONIC DISTORTION vs FREQUENCY -40 -60 Harmonic Distortion (dBc) Harmonic Distortion (dBc) VO = 2VPP f = 5MHz -65 -70 2nd-Harmonic 3rd-Harmonic -75 -50 VO = 2VPP RL = 100W to 2.
PAGE 14
OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com APPLICATION INFORMATION WIDEBAND VOLTAGE-FEEDBACK OPERATION The OPA2690 provides an exceptional combination of high output power capability in a wideband, unity-gain stable voltage-feedback op amp using a new high slew rate input stage. Typical differential input stages used for voltage feedback op amps are designed to steer a fixed-bias current to the compensation capacitor, setting a limit to the achievable slew rate.
PAGE 15
OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 Again, an additional resistor (50Ω in 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.
PAGE 16
OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com HIGH-PERFORMANCE DAC TRANSIMPEDANCE AMPLIFIER 50W 1/2 OPA2690 High-frequency, direct digital synthesis (DDS) digital-to-analog converters (DACs) require a low distortion output amplifier to retain their SFDR performance into real-world loads. Figure 40 shows a single-ended output drive implementation.
PAGE 17
OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 Typically, channel switching is performed either on sync or retrace time in the video signal. The two inputs are approximately equal at this time. The make-before-break disable characteristic of the OPA2690 ensures that there is always one amplifier controlling the line when using a wired-OR circuit like that shown in Figure 41.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com SINGLE-SUPPLY MFB DIFFERENTIAL ACTIVE FILTER: 10MHz BUTTERWORTH CONFIGURATION 50W VI 1/2 OPA2690 RO The active filter circuit shown in Figure 44 can be easily implemented using the OPA2690. In this configuration, each amplifier of the OPA2690 operates as an integrator. For this reason, this type of application is also called infinite gain filter implementation.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 The frequency response for a 10MHz Butterworth filter is shown in Figure 45. One advantage for using this type of filter is the independent setting of wo and Q. Q can be easily adjusted by changing the R3A, B resistors without affecting wo. The circuit shown on the front page has a 195MHz, −3dB bandwidth that can be easily bandlimited by using a capacitor in parallel with the feedback resistors. Refer to Figure 46 for more details.
PAGE 20
OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com DESIGN-IN TOOLS DEMONSTRATION FIXTURES MACROMODELS Two printed circuit boards (PCBs) are available to assist in the initial evaluation of circuit performance using the OPA2690 in its two package options. Both of these are offered free of charge as unpopulated PCBs, delivered with a user’s guide. The summary information for these fixtures is shown in Table 1.
PAGE 21
OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 OPERATING SUGGESTIONS OPTIMIZING RESISTOR VALUES As the the OPA2690 is a unity-gain stable, voltage-feedback op amp, a wide range of resistor values may be used for the feedback and gain setting resistors. The primary limits on these values are set by dynamic range (noise and distortion) and parasitic capacitance considerations.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com INVERTING AMPLIFIER OPERATION Since the OPA2690 is a general-purpose, wideband voltage-feedback op amp, all of the familiar op amp application circuits are available to the designer. Inverting operation is one of the more common requirements and offers several performance benefits. Figure 47 shows a typical inverting configuration where the I/O impedances and signal gain from Figure 36 are retained in an inverting circuit configuration.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 OUTPUT CURRENT AND VOLTAGE The OPA2690 provides output voltage and current capabilities in a low-cost monolithic op amp. Under no-load conditions at +25°C, the output voltage typically swings closer than 1V to either supply rail; the specified swing limit is within 1.2V of either rail. Into a 15Ω load (the minimum tested load), it will deliver more than ±160mA.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com This gain of +2 circuit includes a noise gain tuning resistor across the two inputs to increase the noise gain, increasing the unloaded phase margin for the op amp. Although this technique will reduce the required RS resistor for a given capacitive load, it does increase the noise at the output. It also will decrease the loop gain, slightly decreasing the distortion performance.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 The total output spot noise voltage can be computed as the square root of the sum of all squared output noise voltage contributors. Equation 7 shows the general form for the output noise voltage using the terms shown in Figure 50.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com DISABLE OPERATION (SO-14 Package Only) The OPA2690-I-14D provides an optional disable feature that may be used either to reduce system power or to implement a simple channel multiplexing operation. If the DIS control pin is left unconnected, the OPA2690I-14D will operate normally. To disable, the control pin must be asserted LOW. Figure 52 shows a simplified internal circuit for the disable control feature.
PAGE 27
OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 THERMAL ANALYSIS Due to the high output power capability of the OPA2690, heatsinking or forced airflow may be required under extreme operating conditions. Maximum desired junction temperature will set the maximum allowed internal power dissipation as described below. In no case should the maximum junction temperature be allowed to exceed 150°C.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com BOARD LAYOUT GUIDELINES Achieving optimum performance with a high-frequency amplifier like the OPA2690 requires careful attention to board layout parasitics and external component types. Recommendations that will optimize performance include: a. Minimize parasitic capacitance to any ac ground for all of the signal I/O pins.
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OPA2690 www.ti.com SBOS238G – JUNE 2002 – REVISED MARCH 2010 the 6dB attenuation of a doubly-terminated transmission line is unacceptable, a long trace can be series-terminated at the source end only. Treat the trace as a capacitive load in this case and set the series resistor value as shown in the plots of Recommended RS vs Capacitive Load (Figure 15 for ±5V and Figure 30 for +5V). This will not preserve signal integrity as well as a doubly-terminated line.
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OPA2690 SBOS238G – JUNE 2002 – REVISED MARCH 2010 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision F (August 2008) to Revision G Page • Changed data sheet format to current standards ................................................................................................................. 1 • Changed Related Products table .............................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com (4) 24-Jan-2013 Only one of markings shown within the brackets will appear on the physical 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. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information.
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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 OPA2690I-14DR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 OPA2690IDR 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) OPA2690I-14DR SOIC D 14 2500 367.0 367.0 38.0 OPA2690IDR SOIC D 8 2500 367.0 367.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.