Wideband / Ultra-Low Noise / Voltage Feedback OPERATIONAL AMPLIFIER With Power Down - Burr-Brown
Description
®
OPA 687
OPA687
For most current data sheet and other product information, visit www.
burr-brown.
com
Wideband, Ultra-Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER With Power Down
TM
FEATURES
q HIGH GAIN BANDWIDTH: 3.
8GHz q LOW INPUT VOLTAGE NOISE: 0.
95nV/√Hz q VERY LOW DISTORTION: –95dBc (5MHz) q LOW DISABLED POWER: 2mW q VERY HIGH SLEW RATE: 900V/µs q STABLE FOR G ≥ 12
APPLICATIONS
q q q q q q LOW DISTORTION ADC DRIVER OC-3 FIBER OPTIC RECEIVER LOW NOISE DIFFERENTIAL AMPLIFIERS EQUALIZING RECEIVERS ULTRASOUND CHANNEL AMPLIFIERS IMPROVED REPLACEMENT FOR THE CLC425
DESCRIPTION
The OPA687 combines a very high gain bandwidth and large signal performance with an ultra-low input noise voltage (0.
95nV/√Hz) while dissipating only 18mA supply current.
Where power savings is paramount, the OPA687 also includes an optional power down pin that, when pulled low, will disable the amplifier and decrease the quiescent current to only 1% of its powered up value.
This optional feature may be left disconnected to insure normal amplifier operation when no power-down is required.
The combination of low input voltage and current noise, along with a 3.
8GHz gain bandwidth product, make the OPA687 an ideal amplifier for wideband transimpedance
+5V
VCM 100Ω OPA687 20Ω
stages.
As a voltage gain stage, the OPA687 is optimized for a flat frequency response at a gain of +20 and is guaranteed stable down to gains of +12.
New external compensation techniques allows the OPA687 to be used at any inverting gain with excellent frequency response control.
Using this compensation can give an extremely high dynamic range ADC driver to support > 40MSPS 12- and 14-bit converters.
OPA687 RELATED PRODUCTS
SINGLES OPA642 OPA643 OPA686 DUAL INPUT NOISE VOLTAGE (nV/√Hz) 2.
7 2.
3 1.
3 GAIN BANDWIDTH PRODUCT (MHz) 210 800 1600
OPA2686
+5V
–60
50Ω Source
–5V
VIN+ 850Ω 80pF ADS852 14-Bit 65MSPS
3rd-Order Spurious (dBc)
1.
7pF 39pF
–65 4Vp-p –70
1:2
< 6dB Noise Figure
39pF
850Ω
–75
2Vp-p
+5V
1...
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