LMH6515
- Adjustable Gain with a 31 dB Range
- Precise 1 dB Gain Steps
- Parallel 5-bit Gain Control
- On Chip Register Stores Gain Setting
- Fully Differential Signal Path
- Single Ended to Differential Capable
- 200Ω Input Impedance
- Small Footprint (4 mm x 4 mm) WQFN Package
Key Specifications
- 600 MHz bandwidth @ 100Ω load
- 40 dBm OIP3 @ 75 MHz, 200Ω load
- 20 dB to 30 dB maximum gain
- Selectable output impedance of 200Ω or 400Ω
- 8.3 dB noise figure
- 5 ns gain step switching time
- 100 mA supply current
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The LMH6515 is a high performance, digitally controlled variable gain amplifier (DVGA). It combines precision gain control with a low noise, ultra-linear, differential amplifier. Typically, the LMH6515 drives a high performance ADC in a broad range of mixed signal and digital communication applications such as mobile radio and cellular base stations where automatic gain control (AGC) is required to increase system dynamic range. When used in conjunction with a high speed ADC, system dynamic range can be extended by up to 32 dB.
The LMH6515 has a differential input and output allowing large signal swings on a single 5V supply. It is designed to accept signals from RF elements and maintain a terminated impedance environment. The input impedance is 200Ω resistive. The output impedance is either 200Ω or 400Ω and is user selectable. A unique internal architecture allows use with both single ended and differential input signals.
Input signals to the LMH6515 are scaled by a highly linear, digitally controlled attenuator with 31 accurate 1 dB steps. The attenuator output provides the input signal for a high gain, ultra linear differential transconductor. The transconductor differential output current can be converted into a voltage by using the on-chip 200Ω or 400Ω loads. The transconductance gain is 0.1 Amp/Volt resulting in a maximum voltage gain of +26 dB when driving a 200Ω load, or 32 dB when driving the 400Ω load. On chip digital latches are provided for local storage of the gain setting. The gain step settling time is 5 ns and care has been taken to reduce the sensitivity of bandwidth and phase to gain setting.
The LMH6515 operates over the industrial temperature range of −40°C to +85°C. The LMH6515 is available in a 16-Pin, thermally enhanced, WQFN package.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LMH6515 600 MHz, Digital Controlled, Variable Gain Amplifier datasheet (Rev. C) | 2013. 3. 18 | ||
| e북 | The Signal e-book: A compendium of blog posts on op amp design topics | PDF | HTML | 2017. 3. 28 | ||
| 사용 설명서 | LMH6515EL Digital Controlled, Variable Gain Amplifier Evaluation Board (Rev. B) | 2013. 5. 1 | |||
| 애플리케이션 노트 | AN-1719 Noise Figure Analysis Fully Differential Amplifier (Rev. A) | 2013. 5. 1 | |||
| 애플리케이션 노트 | AN-1718 Differential Amplifier Applications Up to 400 MHz (Rev. B) | 2013. 5. 1 | |||
| 애플리케이션 노트 | Using High Speed Diff Amp to Drive ADCs (Rev. A) | 2013. 4. 26 | |||
| 애플리케이션 노트 | Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths | 2007. 9. 13 | |||
| 애플리케이션 노트 | A Walk Along the Signal Path (High-Speed Signal Path) | 2005. 3. 30 |
설계 및 개발
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LMH6515EVAL — LMH6515 디지털 제어 가변 게인 증폭기 평가 보드
The LMH6515 is a 600 MHz, Digital Controlled, Variable Gain Amplifier from the PowerWise® Family. The LMH6515EL evaluation board is designed to aid in the characterization of TI`s High Speed LMH6515 Digital Controlled Variable Gain Amplifier. Use the evaluation board as a guide for high (...)
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| WQFN (RGH) | 16 | Ultra Librarian |