Datasheet

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

FEATURES

D UNITY GAIN STABLE BANDWIDTH: 1500MHz

D HIGH GAIN OF 2V/V BANDWIDTH: 690MHz

D LOW SUPPLY CURRENT: 5.8mA/ch

D HIGH SLEW RATE: 1700V/μs

D HIGH FULL-POWER BANDWIDTH: 670MHz

D LOW DIFFERENTIAL GAIN/PHASE:

0.03%/0.0155

APPLICATIONS

D MEDICAL IMAGING

D WIDEBAND VIDEO LINE DRIVER

D DIFFERENTIAL RECEIVER

D ADC DRIVER

D HIGH-SPEED SIGNAL PROCESSING

D PULSE AMPLIFIER

D IMPROVED REPLACEMENT FOR OPA2658

Summary of content (28 pages)

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OPA2694 SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 Dual, Wideband, Low-Power, Current Feedback Operational Amplifier FEATURES D D D D D D DESCRIPTION UNITY GAIN STABLE BANDWIDTH: 1500MHz HIGH GAIN OF 2V/V BANDWIDTH: 690MHz The OPA2694 is a dual, ultra-wideband, low-power, current feedback operational amplifier f eaturing high slew rate and low differential gain/phase errors. An improved output stage provides ±70mA output drive with < 1.5V output voltage headroom.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 ABSOLUTE MAXIMUM RATINGS(1) Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6.5VDC Internal Power Dissipation . . . . . . . . . See Thermal Characteristics Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1.2V Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS Storage Temperature Range: D, DBV . . . . . . . . .
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS: VS = ±5V Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω, and G = +2V/V, unless otherwise noted. OPA2694ID TYP MIN/MAX OVER TEMPERATURE +25°C(1) 0°C to 70°C(2) −40°C to +85°C(2) 690 340 330 320 G = +5, VO = 0.5VPP, RF = 330Ω 250 190 170 G = +10, VO = 0.5VPP, RF = 180Ω 200 140 120 G = +1, VO = 0.5VPP, RF = 430Ω Peaking at a Gain of +1 VO ≤ 0.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS: VS = ±5V (continued) Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω, and G = +2V/V, unless otherwise noted. OPA2694ID TYP PARAMETER 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) POWER SUPPLY Specified Operating Voltage ±5 V typ C Maximum Operating Voltage Range — ±6.3 ±6.3 ±6.
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OPA2694 www.ti.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2V/V, unless otherwise noted HARMONIC DISTORTION vs SUPPLY VOLTAGE HARMONIC DISTORTION vs LOAD RESISTANCE G = +2V/V f = 5MHz VO = 2VPP −70 −75 −80 3rd Harmonic −85 2nd Harmonic −90 See Figure 1 −95 100 −80 −85 G = +2V/V f = 5MHz VO = 2VPP RL = 100Ω −90 2.5 1000 2nd Harmonic See Figure 1 3.0 3.5 4.0 4.5 5.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2V/V, unless otherwise noted INPUT VOLTAGE AND CURRENT NOISE 2−TONE, 3rd−ORDER INTERMODULATION INTERCEPT 1k 55 Inverting Current Noise (22pA/√Hz) 10 Intercept Point (+dBm) Current Noise (pA/√Hz) Voltage Noise (nV/√Hz) Noninverting Current Noise (24pA/√Hz) 100 Voltage Noise (2.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2V/V, unless otherwise noted VIDEO DIFFERENTIAL GAIN/DIFFERNTIAL PHASE (No Pulldown) TYPICAL DC DRIFT OVER TEMPERATURE 0.08 0.04 dG Negative Video 0.04 0.02 dP Negative Video 0 2 1 4 Input Offset Voltage (mV) dG Positive Video Differential Phase (_ ) Differential Gain (%) 0.12 0.06 0.
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OPA2694 www.ti.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 WIDEBAND CURRENT FEEDBACK OPERATION The OPA2694 provides exceptional AC performance for a wideband, low-power, current-feedback operational amplifier. Requiring only 5.8mA/ch quiescent current, the OPA2694 offers a 690MHz bandwidth at a gain of +2, along with a 1700V/μs slew rate. An improved output stage provides ±70mA output drive, along with < 1.5V output voltage headroom.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 ADC DRIVER gain), wideband inverting summing stages may be implemented using the OPA2694. The circuit in Figure 4 shows an example inverting summing amplifier, where the resistor values have been adjusted to maintain both maximum bandwidth and input impedance matching. If each RF signal is assumed to be driven from a 50Ω source, the NG for this circuit will be (1 + 100Ω/(100Ω/5)) = 6.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 SAW FILTER BUFFER +VCC One common requirement in an IF strip is to buffer the output of a mixer with enough gain to recover the insertion loss of a narrowband SAW filter. Figure 5 shows one possible configuration driving a SAW filter. The 2-Tone, 3rd-Order Intermodulation Intercept plot is shown in the Typical Characteritics curves.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 common-mode signals very well, while a line driver application through a transformer also attenuates the common-mode signal through to the line. Figure 7 shows a differential I/O stage configured as an inverting amplifier. In this case, the gain resistors (RG) become part of the input resistance for the source.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 DIFFERENTIAL ACTIVE FILTER The OPA2694 can provide a very capable gain block for low-noise active filters. The dual design lends itself very well to differential active filters. Where the filter topology is looking for a simple gain function to implement the filter, the noninverting configuration is preferred to isolate the filter elements from the gain elements in the design.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 OPERATING SUGGESTIONS SETTING RESISTOR VALUES TO OPTIMIZE BANDWIDTH A current-feedback op amp like the OPA2694 can hold an almost constant bandwidth over signal gain settings with the proper adjustment of the external resistor values. This is shown in the Typical Characteristic curves; the small-signal bandwidth decreases only slightly with increasing gain.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 As the desired signal gain increases, this equation will eventually predict a negative RF. A somewhat subjective limit to this adjustment can also be set by holding RG to a minimum value of 20Ω. Lower values will load both the buffer stage at the input and the output stage, if RF gets too low, actually decreasing the bandwidth. Figure 11 shows the recommended RF versus NG for ±5V operation.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 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 Typical Characteristics show the recommended RS vs Capacitive Load and the resulting frequency response at the load. Parasitic capacitive loads greater than 2pF can begin to degrade the performance of the OPA2694.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 alone. This reflects the noise added to the output by the inverting current noise times the feedback resistor. If the feedback resistor is reduced in high-gain configurations (as suggested previously), the total input-referred voltage noise given by Equation (5) will approach just the 2.1nV/√Hz of the op amp itself. For example, going to a gain of +10 using RF = 178Ω will give a total input-referred noise of 2.36nV/√Hz.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 THERMAL ANALYSIS Due to the high output power capability of the OPA2694, 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. Operating junction temperature (TJ) is given by TA + PD × θJA.
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OPA2694 www.ti.com SBOS320D − SEPTEMBER 2004 − REVISED APRIL 2013 and set RS from the plot of Recommended RS vs Capacitive Load. Low parasitic capacitive loads (< 5pF) may not need an RS, since the OPA2694 is nominally compensated to operate with a 2pF parasitic load.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device OPA2694IDR 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 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2694IDR 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.