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OPA657U Datasheet(PDF) 1 Page - Texas Instruments |
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OPA657U Datasheet(HTML) 1 Page - Texas Instruments |
1 / 20 page OPA657 SBOS197B – DECEMBER 2001 – REVISED MAY 2004 www.ti.com 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. Copyright © 2001-2004, Texas Instruments Incorporated 1.6GHz, Low-Noise, FET-Input OPERATIONAL AMPLIFIER 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. FEATURES q HIGH GAIN BANDWIDTH PRODUCT: 1.6GHz q HIGH BANDWIDTH 275MHz (G = +10) q LOW INPUT OFFSET VOLTAGE: ±0.25mV q LOW INPUT BIAS CURRENT: 2pA q LOW INPUT VOLTAGE NOISE: 4.8nV/ Hz q HIGH OUTPUT CURRENT: 70mA q FAST OVERDRIVE RECOVERY APPLICATIONS q WIDEBAND PHOTODIODE AMPLIFIER q WAFER SCANNING EQUIPMENT q ADC INPUT AMPLIFIER q TEST AND MEASUREMENT FRONT END q HIGH GAIN PRECISION AMPLIFIER SLEW VOLTAGE VS BW RATE NOISE DEVICE (V) (MHz) (V/ µS) (nV/√HZ) AMPLIFIER DESCRIPTION OPA355 +5 200 300 5.80 Unity-Gain Stable CMOS OPA655 ±5 400 290 6 Unity-Gain Stable FET-Input OPA656 ±5 500 170 7 Unity-Gain Stable FET-Input OPA627 ±15 16 55 4.5 Unity-Gain Stable FET-Input THS4601 ±15 180 100 5.4 Unity-Gain Stable FET-Input RELATED OPERATIONAL AMPLIFIER PRODUCTS DESCRIPTION The OPA657 combines a high gain bandwidth, low distor-tion, voltage-feedback op amp with a low voltage noise JFET-input stage to offer a very high dynamic range amplifier for high precision ADC (Analog-to-Digital Converter) driving or wideband transimpedance applications. Photodiode applications will see improved noise and bandwidth using this decompensated, high gain bandwidth amplifier. Very low level signals can be significantly amplified in a single OPA657 gain stage with exceptional bandwidth and accuracy. Having a high 1.6GHz gain bandwidth product will give > 10MHz signal bandwidths up to gains of 160V/V (44dB). The very low input bias current and capacitance will support this performance even for relatively high source impedances. Broadband photodetector applications will benefit from the low voltage noise JFET inputs for the OPA657. The JFET input contributes virtually no current noise while for broadband applications, a low voltage noise is also required. The low 4.8nV/ Hz input voltage noise will provide exceptional input sensitivity for higher bandwidth applications. The example shown below will give a total equivalent input noise current of 1.8pA/ Hz over a 10MHz bandwidth. OPA657 OPA657 Wideband Photodiode Transimpedance Amplifier (12pF) λ –V b 200k Ω V O 0.1pF Frequency 200k Ω TRANSIMPEDANCE BANDWIDTH 116 106 96 86 76 66 100kHz 1MHz 10MHz 50MHz 10MHz Bandwidth All trademarks are the property of their respective owners. |
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