OPA2677 OPA 2677 OPA2 677 www.ti.com SBOS126I – APRIL 2000 – REVISED JULY 2008 Dual, Wideband, High Output Current Operational Amplifier FEATURES APPLICATIONS ● ● ● ● ● ● ● ● ● ● ● ● ● ● WIDEBAND +12V OPERATION: 200MHz (G = +4) UNITY-GAIN STABLE: 220MHz (G = +1) HIGH OUTPUT CURRENT: 500mA OUTPUT VOLTAGE SWING: ±5V HIGH SLEW RATE: 1800V/µs LOW SUPPLY CURRENT: 18mA FLEXIBLE SUPPLY RANGE: +5 to +12V Single Supply ±2.
ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS(1) Power Supply ............................................................................... ±6.5VDC Internal Power Dissipation .......................... See Thermal Characteristics Differential Input Voltage .................................................................. ±1.2V Input Common-Mode Voltage Range ................................................. ±VS Storage Temperature Range: U, DDA, RGV .................
ELECTRICAL CHARACTERISTICS: VS = ±6V Boldface limits are tested at +25°C. At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. See Figure 1 for AC performance only. OPA2677U, DDA, RGV MIN/MAX OVER TEMPERATURE TYP PARAMETER AC PERFORMANCE (see Figure 1) Small-Signal Bandwidth (VO = 0.5VPP) Peaking at a Gain of +1 Bandwidth for 0.
ELECTRICAL SPECIFICATIONS: VS = +5V Boldface limits are tested at +25°C. At TA = +25°C, G = +4, RF = 453Ω, and RL = 100Ω, unless otherwise noted. See Figure 3 for AC performance only. OPA2677U, DDA, RGV MIN/MAX OVER TEMPERATURE TYP PARAMETER AC PERFORMANCE (see Figure 3) Small-Signal Bandwidth (VO = 0.5VPP) Peaking at a Gain of +1 Bandwidth for 0.
TYPICAL CHARACTERISTICS: VS = ±6V At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. INVERTING SMALL-SIGNAL FREQUENCY RESPONSE NONINVERTING SMALL-SIGNAL FREQUENCY RESPONSE 6 VO = 0.
TYPICAL CHARACTERISTICS: VS = ±6V (Cont.) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. HARMONIC DISTORTION vs OUTPUT VOLTAGE HARMONIC DISTORTION vs FREQUENCY –60 –60 VO = 2VPP RL = 100Ω –70 –75 –80 –85 3rd-Harmonic –90 –95 F = 5MHz RL = 100Ω –65 2nd-Harmonic Harmonic Distortion (dBc) Harmonic Distortion (dBc) –65 2nd-Harmonic –70 –75 –80 –85 3rd-Harmonic –90 –95 Single Channel—see Figure 1 Single Channel—see Figure 1 –100 –100 0.1 1 10 0.
TYPICAL CHARACTERISTICS: VS = ±6V (Cont.) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted.
TYPICAL CHARACTERISTICS: VS = ±6V (Cont.) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted. Transimpedance Gain (20dBΩ/div) Power-Supply Rejection Ratio (dB) Common-Mode Rejection Ratio (dB) CMRR 60 50 40 –PSRR 30 +PSRR 20 10 120 0 100 –45 80 –90 60 –135 40 –180 20 –225 0 0 10k 1k 100k 1M 10M –270 10k 100M 100k 1M CLOSED-LOOP OUTPUT IMPEDANCE vs FREQUENCY 1G COMPOSITE VIDEO dG/dφ 100 0.14 G = +2 RF = 475Ω VS = ±5V 0.
TYPICAL CHARACTERISTICS: VS = ±6V (Cont.) At TA = +25°C, G = +4, RF = 402Ω, and RL = 100Ω, unless otherwise noted.
TYPICAL CHARACTERISTICS: VS = ±6V (Cont.) At TA = +25°C, Differential Gain = +9, RF = 300Ω, and RL = 70Ω, unless otherwise noted. See Figure 5 for AC performance only. DIFFERENTIAL SMALL-SIGNAL FREQUENCY RESPONSE DIFFERENTIAL LARGE-SIGNAL FREQUENCY RESPONSE 3 20 GD = +2, RF = 442Ω 19 0 –3 GD = +9, RF = 300Ω 0.
TYPICAL CHARACTERISTICS: VS = +5V At TA = +25°C, G = +4, RF = 453Ω, and RL = 100Ω to VS/2, unless otherwise noted.
TYPICAL CHARACTERISTICS: VS = +5V (Cont.) At TA = +25°C, G = +4, RF = 453Ω, and RL = 100Ω to VS/2, unless otherwise noted. HARMONIC DISTORTION vs OUTPUT VOLTAGE HARMONIC DISTORTION vs FREQUENCY –50 –50 VO = 2VPP RL = 100Ω to VS/2 f = 5MHz RL = 100Ω to VS/2 –55 Harmonic Distortion (dBc) Harmonic Distortion (dBc) –55 –60 –65 2nd-Harmonic –70 –75 3rd-Harmonic –80 –60 –65 –70 Single Channel —see Figure 3 –75 2nd-Harmonic –80 –85 –85 3rd-Harmonic Single Channel—see Figure 3 –90 –90 0.
TYPICAL CHARACTERISTICS: VS = +5V (Cont.) At TA = +25°C, Differential Gain = +9, RF = 316Ω, and RL = 70Ω, unless otherwise noted.
APPLICATION INFORMATION WIDEBAND CURRENT-FEEDBACK OPERATION The OPA2677 gives the exceptional AC performance of a wideband current-feedback op amp with a highly linear, highpower output stage. Requiring only 9mA/ch quiescent current, the OPA2677 swings to within 1V of either supply rail and delivers in excess of 380mA at room temperature. This low-output headroom requirement, along with supply voltage independent biasing, gives remarkable single (+5V) supply operation.
where the input is brought into the OPA2677. Each has its advantages and disadvantages. Figure 5 shows a basic starting point for noninverting differential I/O applications. +5V +VS 0.1µF + 6.8µF 806Ω +6 0.1µF VI 57.6Ω 1/2 OPA2677 806Ω VO 1/2 OPA2677 100Ω VS/2 RF 300Ω RF 453Ω VI RG 150Ω RG 75Ω CG RL VO RF 300Ω 0.1µF 1/2 OPA2677 FIGURE 3. AC-Coupled, G = +4, Single-Supply, Specification and Test Circuit.
SINGLE-SUPPLY ADSL UPSTREAM DRIVER OPA2677 HDSL2 UPSTREAM DRIVER Figure 6 shows an example of a single-supply ADSL upstream driver. The dual OPA2677 is configured as a differential gain stage to provide signal drive to the primary winding of the transformer (here, a step-up transformer with a turns ratio of 1:1.7). The main advantage of this configuration is the cancellation of all even harmonic distortion products.
the line and transformer turns ratio. As this turns ratio changes, the minimum allowed supply voltage changes along with it. The peak current in the amplifier output is given by: ±IP = 1 2 • VLPP 1 • • n 2 4RM (8) with VPP as defined in Equation 7, and RM as defined in Equation 2 and shown in Figure 8. TOTAL DRIVER POWER FOR xDSL APPLICATIONS The total internal power dissipation for the OPA2677 in an xDSL line driver application will be the sum of the quiescent power and the output stage power.
DESIGN-IN TOOLS DEMONSTRATION FIXTURES VI α A printed circuit board (PCB) is available to assist in the initial evaluation of circuit performance using the OPA2677. The fixture is offered free of charge as unpopulated PCB, delivered with a user’s guide. The summary information for this fixture is shown in Table II.
frequency response given by Equation 14 starts to roll off, and is exactly analogous to the frequency at which the noise gain equals the open-loop voltage gain for a voltage-feedback op amp. The difference here is that the total impedance in the denominator of Equation 15 may be controlled somewhat separately from the desired signal gain (or NG). The OPA2677 is internally compensated to give a maximally flat frequency response for RF = 402Ω at NG = 4 on ±6V supplies.
transimpedance nearly equal to the 402Ω optimum value. Note that the noninverting input in this bipolar supply inverting application is connected directly to ground. It is often suggested that an additional resistor be connected to ground on the noninverting input to achieve bias current error cancellation at the output. The input bias currents for a currentfeedback op amp are not generally matched in either magnitude or polarity.
In most op amps, increasing the output voltage swing increases harmonic distortion directly. The Typical Characteristics show the 2nd-harmonic increasing at a little less than the expected 2x rate whereas the 3rd-harmonic increases at a little less than the expected 3x rate. Where the test power doubles, the difference between it and the 2nd-harmonic decreases less than the expected 6dB, whereas the difference between it and the 3rd-harmonic decreases by less than the expected 12dB.
As a reminder, the differential gain is expressed as: GD = 1 + 2 • RF RG (19) The output noise can be expressed as shown below: (20) 2 2 EO = 2 • GD 2 • eN2 + (iN • R S ) + 4kTRS + 2(iIRF ) + 2(4kTRF GD ) Dividing this expression by the differential noise gain (GD = (1 + 2RF/RG)) gives the equivalent input referred spot noise voltage at the noninverting input, as shown in Equation 21.
Again, keep leads and PCB trace length as short as possible. Never use wire-wound type resistors in a high-frequency application. Although 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.
Revision History DATE REVISION PAGE SECTION DESCRIPTION 7/08 I 2 Abs Max Ratings Changed Storage Temperature Range from −40°C to +125°C to −65°C to +125°C. 3/08 H 3 Electrical Characteristics Added Both Channels; Power Supply section under Conditions. 4 Electrical Characteristics Added +5V and Both Channels; Power Supply section under Conditions. NOTE: Page numbers for previous revisions may differ from page numbers in the current version. 24 OPA2677 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 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 OPA2677IDDAR SO Power PAD DDA 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 OPA2677IRGVR VQFN RGV 16 2500 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 OPA2677IRGVT VQFN RGV 16 250 180.0 12.4 4.25 4.25 1.15 8.0 12.
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2677IDDAR SO PowerPAD DDA 8 2500 367.0 367.0 35.0 OPA2677IRGVR VQFN RGV 16 2500 367.0 367.0 35.0 OPA2677IRGVT VQFN RGV 16 250 210.0 185.0 35.0 OPA2677U/2K5 SOIC D 8 2500 367.0 367.0 35.
MECHANICAL DATA MPDS100 – AUGUST 2001 DTJ (R-PDSO-G8) PLASTIC SMALL–OUTLINE 0.1968 (4,98) C –A– 0.189 (4,80) 8 5 –B– 0.1574 (4,00) D 0.1497 (3,80) 0.244 (6,20) 0.2284 (5,80) 0.010 (0,25) M B M Index Area 1 4 0.050 (1,27) Base Plane 0.018 (0,46) 0.0196 (0,50) 0.016 (0,41) 0.0099 (0,25) × 45° 0.0688 (1,75) –C– Seating Plane 0.0532 (1,35) 0.020 (0,51) 0.004 (0,10) 0.001 (0,03) G 0.013 (0,33) 0.010 (0,25) M C A M B S 0.0098 (0,25) 0.0075 (0,20) 0.004 (0,10) ø0.015 (0,38) M Z X S 0.
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