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OPA4684MJD Datasheet(PDF) 1 Page - Texas Instruments |
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OPA4684MJD Datasheet(HTML) 1 Page - Texas Instruments |
1 / 32 page OPA4684M QUAD LOW POWER CURRENT FEEDBACK OPERATIONAL AMPLIFIER SGLS145B − AUGUST 2003 − REVISED FEBRUARY 2004 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 features D Minimal Bandwidth Change Versus Gain D 170-MHz Bandwidth at G = +2 D > 120 MHz Bandwidth To Gain > +10 D Low Distortion: < −78 dBc at 5 MHz D High Output Current: 120 mA D Single 5-V to 12-V Supply Operation D Dual ±2.5 to ±6.0V Supply Operation D Low Supply Current: 6.8 mA Total applications D Low-Power Broadcast Video Drivers D Equalizing Filters D Saw Filter High-Gain Post Amplifiers D Multichannel Summing Amplifiers D Wideband Differential Channels D Analog-to-Digital Converters (ADC) Input Drivers D Multiple Pole Active Filters D OPA4658 Low-Power Upgrade description The OPA4684 provides a new level of performance in low-power, wideband, current-feedback (CFB) amplifiers. This CFBPLUS amplifier is 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 solutions limited by inverting input linearity. Beyond simple high-gain applications, the OPA4684 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 have greater bandwidth, and low-power line drivers to meet the demanding requirements of studio cameras and broadcast video. The output capability of the OPA4684 also sets a new mark in performance for low-power current-feedback amplifiers. Delivering a full ±4Vp-p swing on ±5V supplies, the OPA4684 also has the output current to support > ±3-V swing into 50 Ω. This minimal output headroom requirement is complemented by a similar 1.2-V input stage headroom giving exceptional capability for single +5V operation. The OPA4684’s low 6.8-mA 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. Low Power CFBPLUS Amplifer 1 of 4 Channels Z(S)IERR VO RF IERR V− V+ RG Patent Pending CFBPLUS BW (MHz) vs Gain Copyright 2003− 2004 Texas Instruments Incorporated 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. 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. |
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