Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Current feedback SOIC 14

FEATURES

D WIDEBAND +12V OPERATION: 220MHz (G = +4)

D UNITY-GAIN STABLE: 250MHz (G = +1)

D HIGH OUTPUT CURRENT: 500mA

D OUTPUT VOLTAGE SWING: 10V

D HIGH SLEW RATE: 2000V/µs

D LOW SUPPLY CURRENT: 18mA

D FLEXIBLE POWER CONTROL: SO-14 Only

D OUTPUT CURRENT LIMIT (±800mA)

APPLICATIONS

D POWER LINE MODEM

D xDSL LINE DRIVERS

D CABLE MODEM DRIVERS

D MATCHED I/Q CHANNEL AMPLIFIERS

D BROADBAND VIDEO LINE DRIVERS

D ARB LINE DRIVERS

D HIGH CAP LOAD DRIVER

OPA2674 RELATED PRODUCTS

SINGLES DUALS TRIPLES NOTES

OPA691 OPA2691 OPA3691 Single +12V Capable

 THS6042  ±15V Capable

 OPA2677  Single +12V Capable

DESCRIPTION

The OPA2674 provides the high output current and low

distortion required in emerging xDSL and Power Line Mo-

dem driver applications. Operating on a single +12V sup-

ply, the OPA2674 consumes a low 9mA/ch quiescent cur-

rent to deliver a very high 500mA output current. This

output current supports even the most demanding ADSL

CPE requirements with > 380mA minimum output current

(+25°C minimum value) with low harmonic distortion. Dif-

ferential driver applications deliver < −85dBc distortion at

the peak upstream power levels of full rate ADSL. The high

200MHz bandwidth also supports the most demanding

VDSL line driver requirements.

Power control features are included in the SO-14 package

version to allow system power to be minimized. Two logic

control lines allow four quiescent power settings. These in-

clude full power, power cutback for short loops, idle state

for no signal transmission but line match maintenance,

and shutdown for power off with a high impedance output.

Specified on ±6V supplies (to support +12V operation), the

OPA2674 will also support a single +5V or dual ±5V sup-

ply. Video applications will benefit from a very high output

current to drive up to 10 parallel video loads (15Ω) with <

0.1%/0.1°dG/dP nonlinearity.

Single−Supply CPE Upstream Driver

82.5

Ω

Ω 1

17.4

Ω

100

Ω

AFE

Output

324

Ω

324

Ω

1/2

OPA2674

1/2

OPA2674

+12V

1:1.7

15V

Twisted Pair17.7V

Ω

17.4

Ω

+6.0V

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 !     !   

OPA2674

SBOS270C − AUGUST 2003 − REVISED AUGUST 2008

Dual Wideband, High Output Current

Operational Amplifier with Current Limit

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.

All trademarks are the property of their respective owners.

Summary of content (36 pages)

PAGE 1
OPA2674 SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 Dual Wideband, High Output Current Operational Amplifier with Current Limit FEATURES DESCRIPTION D D D D D D D D The OPA2674 provides the high output current and low distortion required in emerging xDSL and Power Line Modem driver applications. Operating on a single +12V supply, the OPA2674 consumes a low 9mA/ch quiescent current to deliver a very high 500mA output current.
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"#$% www.ti.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = ±6V Boldface limits are tested at +25°C. At TA = +25°C, A1 = A0 = 1 (full power: for SO-14 only), G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. See Figure 1 for AC performance only. OPA2674ID, OPA2674I-14D TYP PARAMETER AC Performance (see Figure 1) Small-Signal Bandwidth (VO = 0.5VPP) Peaking at a Gain of +1 Bandwidth for 0.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = ±6V (continued) Boldface limits are tested at +25°C. At TA = +25°C, A1 = A0 = 1 (full power: for SO-14 only), G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. See Figure 1 for AC performance only. OPA2674ID, OPA2674I-14D TYP PARAMETER TEST CONDITIONS +25°C MIN/MAX OVER TEMPERATURE +25°C(1) 0°C to +70°C(2) −40°C to +85°C(2) UNITS MIN/ MAX TEST LEVEL (3) ±6.3 18.6 17.4 51 ±6.3 18.8 16.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = +5V Boldface limits are tested at +25°C. At TA = +25°C, A1 = 1, A0 = 1 (Full Power: for SO-14 only), G = +4, RF = 453Ω, and RL = 100Ω, unless otherwise noted. See Figure 3 for AC performance only.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = +5V(continued) Boldface limits are tested at +25°C. At TA = +25°C, A1 = 1, A0 = 1 (Full Power: for SO-14 only), G = +4, RF = 453Ω, and RL = 100Ω, unless otherwise noted. See Figure 3 for AC performance only. OPA2674ID, OPA2674I-14D TYP PARAMETER TEST CONDITIONS +25°C MIN/MAX OVER TEMPERATURE +25°C(1) 0°C to +70°C(2) −40°C to +85°C(2) UNITS MIN/ MAX TEST LEVEL (3) 12.6 14.8 12 12.6 15.2 11.7 12.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±6V At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. INVERTING SMALL−SIGNAL FREQUENCY RESPONSE OVER GAIN NONINVERTING SMALL−SIGNAL FREQUENCY RESPONSE OVER GAIN 3 3 VO = 0.5VPP 0 0 G = +1, RF = 511Ω −3 G = +2, RF = 475Ω −6 −9 Normalized Gain (dB) Normalized Gain (dB) VO = 0.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±6V (continued) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±6V (continued) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±6V (continued) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. RECOMMENDED RS vs CAPACITIVE LOAD FREQUENCY RESPONSE vs CAPACITIVE LOAD 2 90 CL = 10pF Normalized Gain to Capacitive Load (dB) 80 70 50 40 30 20 CL = 100pF −2 −4 RS 1/2 OPA2674 −6 −8 133Ω 1kΩ(1) NOTE: (1) 1kΩ is optional.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±6V (continued) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±6V At TA = +25°C, Differential Gain = +9, RF = 300Ω, and RL = 70Ω, unless otherwise noted. See Figure 5 for AC performance only.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V At TA = +25°C, G = +4, RF = 453Ω, and RL = 100Ω, unless otherwise noted.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V (continued) At TA = +25°C, G = +4, RF = 453Ω, and RL = 100Ω, unless otherwise noted. Harmonic Distortion (dBc) −55 −60 HARMONIC DISTORTION vs FREQUENCY 2nd−Harmonic −65 −70 −75 −80 3rd−Harmonic −85 0.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V At TA = +25°C, Differential Gain = +9, RF = 316Ω, and RL = 70Ω, unless otherwise noted.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 APPLICATION INFORMATION WIDEBAND CURRENT-FEEDBACK OPERATION The OPA2674 gives the exceptional AC performance of a wideband current-feedback op amp with a highly linear, high-power output stage. Requiring only 9mA/ch quiescent current, the OPA2674 swings to within 1V of either supply rail and delivers in excess of 380mA at room temperature.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 er important advantage for ADSL is that each amplifier needs only half of the total output swing required to drive the load. +5V +VS 0.1µF +12V + 6.8µF 806Ω 20Ω 1/2 OP A2674 0.1µF VI 57.6Ω 806Ω VO 1/2 OPA2674 100Ω VS/2 RF 453Ω +6V 0.1µF 17.4Ω RM RF 324Ω 0.1µF AFE 2VPP Max Assumed IP = 128mA 2kΩ 2kΩ RG 150Ω RG 82.5Ω 17.7VPP 17.4Ω RM 1µF RF 324Ω ZLine 100Ω IP = 128mA 0.1µF 20Ω Figure 3.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 OPA2674 HDSL2 UPSTREAM DRIVER Figure 6 shows an HDSL2 implementation of a singlesupply driver. V LPP + 2 +12V 20Ω IP = 185mA AFE 2VPP Max Assumed +6V 0.1µF 11.5Ω 324Ω 2kΩ 82.5Ω 1:2.4 ZLine 17.7VPP 1µF 324Ω 2kΩ " IP + 1 2 Figure 6. HDSL2 Upstream Driver The two designs differ by the values of the matching impedance, the load impedance, and the ratio turns of the transformers.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 be the peak current in the load given by Equation 8 divided by the crest factor (CF) for the xDSL modulation. This total power from the supply is then reduced by the power in RT to leave the power dissipated internal to the drivers in the four output stage transistors. That power is simply the target line power used in Equation 2 plus the power lost in the matching elements (RM).
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 TI web site (www.ti.com). This model does a good job of predicting small-signal AC and transient performance under a wide variety of operating conditions, but does not do as well in predicting the harmonic distortion or dG/dP characteristics. This model does not attempt to distinguish between the package types in small-signal AC performance, nor does it attempt to simulate channel-to- channel coupling.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 nator of Equation 15 (which is the feedback transimpedance) gives an optimal target of 490Ω. As the signal gain changes, the contribution of the NG × RI term in the feedback transimpedance changes, but the total can be held constant by adjusting RF. Equation 16 gives an approximate equation for optimum RF over signal gain: R F + 490 * NG RI (16) As the desired signal gain increases, this equation eventually suggests a negative RF.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 33.5Ω. This impedance is added in series with RG for calculating the noise gainwhich gives NG = 3.98. This value, and the inverting input impedance of 22Ω, are inserted into Equation 16 to get the RF that appears in Figure 12. Note that the noninverting input in this bipolar supply inverting application is connected directly to ground.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 2nd-harmonic decreases less than the expected 6dB, whereas the difference between it and the 3rd-harmonic decreases by less than the expected 12dB. This factor also shows up in the 2-tone, 3rd-order intermodulation spurious (IM3) response curves. The 3rd-order spurious levels are extremely low at low-output power levels. The output stage continues to hold them low even as the fundamental power reaches very high levels.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 DC ACCURACY AND OFFSET CONTROL A current-feedback op amp such as the OPA2674 provides exceptional bandwidth in high gains, giving fast pulse settling but only moderate DC accuracy. The Electrical Characteristics show an input offset voltage comparable to high-speed, voltage-feedback amplifiers; however, the two input bias currents are somewhat higher and are unmatched.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 SO-14 package and the power cutback feature. Repeating this calculation for that solution gives: +VS TJ MAX = 70°C + ((12V × 14.2mA) + 12V × 128mA/(5.33) − 40mW) × 100°C/W = 112°C 120kΩ 1.2V Q2 Q1 60kΩ 46kΩ A0 or A1 −VS Control −VS Figure 15. Supply Power Control Circuit The shutdown feature for the OPA2674 is a positive-supply referenced, current-controlled interface.
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"#$% www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 age on the other side of the board between the output and inverting input pins. The frequency response is primarily determined by the feedback resistor value as described previously. Increasing the value reduces the bandwidth, whereas decreasing it gives a more peaked frequency response. The 402Ω feedback resistor used in the Typical Characteristics at a gain of +4 on ±6V supplies is a good starting point for design.
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www.ti.com SBOS270C − AUGUST 2003 − REVISED AUGUST 2008 Revision History DATE REV PAGE SECTION 8/08 C 2 Absolute Maximum Ratings 3/08 B 4, 6 Electrical Characteristics DESCRIPTION Changed Storage Temperature minimum value from −40°C to −65°C. Added Both Channels; Power Supply and Power Supply (SO−14 only) sections under Conditons. NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
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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-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device OPA2674IDR Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.4 B0 (mm) K0 (mm) P1 (mm) 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2674IDR SOIC D 8 2500 367.0 367.0 35.
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