OPA2683
- REDUCED BANDWIDTH CHANGE VERSUS GAIN
- 150MHz BANDWIDTH G = +2
- >80MHz BANDWIDTH TO GAIN > +10
- LOW DISTORTION: < –65dBc at 5MHz
- HIGH OUTPUT CURRENT: 110mA
- SINGLE-SUPPLY OPERATION: +5V to +12V
- DUAL-SUPPLY OPERATION: ±2.5V to ±6V
- LOW SUPPLY CURRENT: 1.9mA Total
- POWER SHUTDOWN VERSION: MSOP-10
- APPLICATIONS
- LOW POWER BROADCAST VIDEO DRIVER
- µPOWER ACTIVE FILTERS
- SHORT LOOP ADSL CO DRIVER
- MULTICHANNEL SUMMING AMPLIFIERS
- PROFESSIONAL CAMERAS
- DIFFERENTIAL ADC INPUT DRIVER
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The OPA2683 provides a new level of performance for dual, very low-power, wideband, current-feedback amplifiers. This CFBPLUS amplifier is among the first to use an internally closed-loop input buffer stage that significantly enhances performance over earlier low-power, current-feedback (CFB) amplifiers. This new architecture provides many of the advantages of a more ideal CFB amplifier while retaining the benefits of very low-power operation. 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 gives exceptional bandwidth retention to much higher gains and improved harmonic distortion over earlier solutions limited by inverting input linearity. Beyond simple high gain applications, the OPA2683 CFBPLUS amplifier can allow the gain setting element to be set with considerable freedom from amplifier bandwidth interaction. This flexibility allows frequency response peaking elements to be added, multiple input inverting summing circuits to have greater bandwidth, and low-power differential line drivers to meet the demanding requirements of DSL.
The output capability for the OPA2683 also sets a new mark in performance for very low-power current-feedback amplifiers. Delivering a full ±4Vpp swing on ±5V supplies, the OPA2683 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 OPA2683’s low 1.9mA total 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. Further system power reduction is possible using the shutdown feature of the MSOP-10 package.
기술 자료
설계 및 개발
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The DEM-OPA-SO-2A demonstration evaluation module helps designers evaluate the operation and performance of TI dual-channel, high-speed, wideband operational amplifiers. This unpopulated printed-circuit board (PCB) is compatible with products offered in the 8-lead SOIC (D) package.
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ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
아날로그 엔지니어의 계산기는 아날로그 회로 설계 엔지니어가 정기적으로 사용하는 많은 반복 계산의 속도를 높이도록 설계되었습니다. 이 PC 기반 툴은 피드백 저항을 사용한 연산 증폭기 게인 설정부터 아날로그-디지털 컨버터(ADC) 드라이브 버퍼 회로 안정화를 위한 적절한 회로 설계 요소 선택에 이르기까지 다양한 일반적인 계산 목록이 포함된 그래픽 인터페이스를 제공합니다.
이 계산기는 독립 실행형 툴로 유용할 뿐만 아니라 아날로그 엔지니어의 포켓 레퍼런스에 설명된 개념과도 잘 어울립니다.
TIDA-00025 — 저전력 완전 차동 프로그래머블 게인 증폭기 레퍼런스 디자인
Reference Design for a Low Power Fully Differential Programmable Gain Amplifier using the TI OPA2683 Low Power Dual Current Feedback Amplifier. This design guide reviews some of the design challenges necessary to create such a circuit. The design guide reviews the results and provides some (...)
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| SOT-23 (DCN) | 8 | Ultra Librarian |
| VSSOP (DGS) | 10 | Ultra Librarian |
| SOIC (D) | 8 | Ultra Librarian |