OPA847

OPA847 OPA847 www.ti.com SBOS251E – JULY 2002 – REVISED DECEMBER 2008 Wideband, Ultra-Low Noise, Voltage-Feedback OPERATIONAL AMPLIFIER with Shutdown FEATURES q HIGH GAIN BANDWIDTH: 3.9GHz q LOW INPUT VOLTAGE NOISE: 0.85nV/√Hz q VERY LOW DISTORTION: –105dBc (5MHz) q HIGH SLEW RATE: 950V/µs q HIGH DC ACCURACY: VIO < ±100µV q LOW SUPPLY CURRENT: 18.1mA q LOW SHUTDOWN POWER: 2mW q STABLE FOR GAINS ≥ 12 APPLICATIONS q HIGH DYNAMIC RANGE ADC PREAMPS q LOW NOISE, WIDEBAND, TRANSIMPEDANCE AMPLIFIERS q WIDEBAND, HIGH GAIN AMPLIFIERS q LOW NOISE DIFFERENTIAL RECEIVERS q ULTRASOUND CHANNEL AMPLIFIERS q IMPROVED UPGRADE FOR THE OPA687, CLC425, AND LMH6624 50Ω Source 1:2 < 5.1dB Noise Figure 100Ω 39pF 39pF 100Ω +5V OPA847 1.7pF –5V 850Ω 850Ω +5V 1.7pF OPA847 0.001µF 20Ω +5V INP 2kΩ 100pF VCM ADS5500 14-Bit 0.1µF 125MSPS 2kΩ 0.001µF 20Ω INN 100pF –5V 24.6dB Gain Ultra-High Dynamic Range Differential ADC Driver DESCRIPTION The OPA847 combines very high gain bandwidth and large signal performance with an ultra-low input noise voltage (0.85nV/√Hz) while using only 18mA supply current. Where power saving is critical, the OPA847 also includes an optional power shutdown pin that, when pulled low, disables the amplifier and decreases the supply current to < 1% of the powered-up value. This optional feature may be left disconnected to ensure normal amplifier operation when no powerdown is required. The combination of very low input voltage and current noise, along with a 3.9GHz...