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| OPA3684 |
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OPA3684 www.ti.com Copyright © 2002, Texas Instruments Incorporated 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. SBOS241A – MAY 2002 – REVISED SEPTEMBER 2002 Low-Power, Triple Current-Feedback OPERATIONAL AMPLIFIER With Disable FEATURES q MINIMAL BANDWIDTH CHANGE VERSUS GAIN q 170MHz BANDWIDTH: G = +2 q > 120MHz BANDWIDTH TO GAIN > +10 q LOW DISTORTION: < –82dBc at 5MHz q HIGH OUTPUT CURRENT: 120mA q SINGLE +5V TO +12V SUPPLY OPERATION q DUAL ±2.5V TO ±6.0V SUPPLY OPERATION q LOW SUPPLY CURRENT: 1.7mA/ch q LOW SHUTDOWN CURRENT: 100 µA/ch V+ V O V– I ERR R G R F Z (S) IERR 1 of 3 Channels + Low-Power Amplifier DESCRIPTION The OPA3684 provides a new level of performance in low-power, wideband, current-feedback (CFB) amplifiers. This CFBPLUS am- plifier among the first to use an internally closed-loop input buffer stage that enhances performance significantly over earlier low- power CFB amplifiers. While retaining the benefits of very low power operation, this new architecture provides many of the benefits of a more ideal CFB amplifier. The closed-loop input stage buffer gives a very low and linearized impedance path at the inverting input to sense the feedback error current. This improved inverting input impedance retains exceptional bandwidth to much higher gains and improves harmonic distortion over earlier solu- tions limited by inverting input linearity. Beyond simple high-gain applications, the OPA3684 CFBPLUS amplifier permits the gain setting element to be set with considerable freedom from amplifier bandwidth interaction. This allows frequency response peaking elements to be added, multiple input inverting summing circuits to APPLICATIONS q RGB LINE DRIVERS q LOW-POWER BROADCAST VIDEO DRIVERS q EQUALIZING FILTERS q MULTICHANNEL SUMMING AMPLIFIERS q PROFESSIONAL CAMERAS q ADC INPUT DRIVERS have greater bandwidth, and low-power line drivers to meet the demanding requirements of studio cameras and broadcast video. The output capability of the OPA3684 also sets a new mark in performance for low-power current-feedback amplifiers. Delivering a full ±4Vp-p swing on ±5V supplies, the OPA3684 also has the output current to support > ±3Vp-p into 50Ω. This minimal output headroom requirement is complemented by a similar 1.2V input stage headroom giving exceptional capability for single +5V opera- tion. The OPA3684’s low 1.7mA/ch supply current is precisely trimmed at 25 °C. This trim, along with low shift over temperature and supply voltage, gives a very robust design over a wide range of operating conditions. System power may be further reduced by using the optional disable control pin. Leaving this disable pin open, or holding it HIGH, gives normal operation. If pulled LOW, the OPA3684 supply current drops to less than 100 µA/ch while the I/O pins go to a high impedance state. 6 3 0 –3 –6 –9 –12 –15 –18 –21 –24 R F = 800Ω G = 100 G = 50 G = 20 G = 10 G = 2 G = 1 10 100 200 BW (MHz) vs GAIN G = 5 MHz Patent Pending OPA3 684 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. |
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