OPA684 - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

OPA684
Manufacturer

TI
ChipWorker Part#

CW355879365
RoHS

Lead free / RoHS Compliant
Description

Low-Power, Current Feedback OPERATIONAL AMPLIFIER With Disable
Documentation

Datasheet

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OPA684 Specifications

Attribute	Attribute Value

Part Number	OPA684
Manufacturer	TI
ChipWorker Part#	CW355879365
Documentation	Datasheet
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RoHS	RoHS Compliant
Lead-Free Status	Lead Free

Product Description

The OPA684 provides a new level of performance in low-power, wideband, current-feedback (CFB) amplifiers. This CFB_plus_ amplifier is 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 OPA684 CFB_plus_ 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 OPA684 also sets a new mark in performance for low-power current feedback amplifiers. Delivering a full ±4Vpp swing on ±5V supplies, the OPA684 also has the output current to support this swing into a 100 load. This minimal output headroom requirement is complemented by a similar 1.2V input stage headroom giving exceptional capability for single +5V operation.
The OPA684s low 1.7mA 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. System power may be further reduced by using the optional disable control pin. Leaving this disable pin open, or holding it HIGH, gives normal operation. If pulled LOW, the OPA684 supply current drops to less than 100µA while the I/O pins go to a high impedance state.
MINIMAL BANDWIDTH CHANGE VERSUS GAIN
> 120MHz BANDWIDTH TO GAIN > +10
LOW DISTORTION: < 78dBc at 5MHz
HIGH OUTPUT CURRENT: 120mA
SINGLE +5V TO +12V SUPPLY OPERATION
DUAL ±2.5 TO ±6.0V SUPPLY OPERATION
LOW SUPPLY CURRENT: 1.7mA
LOW SHUTDOWN CURRENT: 100µA
APPLICATIONS
LOW-POWER BROADCAST VIDEO DRIVERS
EQUALIZING FILTERS
SAW FILTER HIGH GAIN POST AMPLIFIERS
MULTICHANNEL SUMMING AMPLIFIERS
PROFESSIONAL CAMERAS
ADC INPUT DRIVERS
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