Voltage-Feedback Operational Amplifier
OPA847
OPA847
www.ti.com
SBOS251E – JULY 2002 – REVISED DECEMBER 2008
Wideband, Ultra-Low Noise, Voltage-Feedback OPE...
Description
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...
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