PGA848
- Differential to single-ended conversion
- Eight pin-programmable decade (scope) gains
- G (V/V) = ½, 1, 2, 5, 10, 20, 50, and 100
- Low gain error drift: ±2ppm/°C (maximum)
- Faster signal processing:
- Wide bandwidth: 6.2MHz (G < 10), 2.4MHz (G = 50, 100)
- High slew rate: 43V/µs at all gains
- Settling time: 710ns to 0.01% (G < 20)
- Input stage noise: 8.5nV/√Hz at G > 10V/V
- Filter option to achieve better SNR
- Input overvoltage protection to ±40V beyond supplies
- Input-stage supply range:
- Single supply: 9V to 36V
- Dual supply: ±4.5V to ±18V
- Independent output power-supply pins
- Output-stage supply range:
- Single supply: 4.5V to 36V
- Dual supply: ±2.25V to ±18V
- Specified temperature range: –40°C to +125°C
- Small package: 3mm × 3mm VQFN
The PGA848 is a wide-bandwidth, low-noise programmable gain instrumentation amplifier for differential-to-single-ended conversion. The PGA848 is equipped with eight decade (scope) gain settings, from an attenuating gain of 0.5V/V to a maximum of 100V/V. Gain is set using three digital gain selection pins.
The PGA848 architecture is optimized to drive inputs of high-resolution, precision analog-to-digital converters (ADCs) with sampling rates up to 1MSPS without additional ADC drivers. The output-stage power supplies are decoupled from the input stage to protect the ADC or downstream devices against overdrive damage.
The super-beta input transistors offer an impressively low input bias current, which in turn provides a very low input current noise density of 0.3pA/√Hz. This capability makes the PGA848 a versatile choice for virtually any sensor type. The low-noise current-feedback front-end architecture offers exceptional gain flatness even at high frequencies, making the PGA848 an excellent high-impedance sensor readout device. Integrated protection circuitry on the input pins handles overvoltages of up to ±40V beyond the power-supply voltages.
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기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | PGA848 Low-Noise, Wide-Bandwidth, Scope Gain, Single-Ended Output, Programmable Gain Instrumentation Amplifier datasheet (Rev. A) | PDF | HTML | 2025. 12. 5 |
설계 및 개발
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PGA848EVM — PGA848 평가 모듈
PGA848 평가 모듈(PGA848EVM)은 정밀, 저잡음, 고대역폭 PGIA(프로그래머블 게인 계측 증폭기)인 PGA848을 평가하기 위한 개발 플랫폼입니다. PGA848에는 3개의 디지털 게인 선택 핀을 사용하는, 0.5V/V의 감쇠 게인부터 최대 100V/V까지 8개의 십진(범위) 게인 설정이 포함되어 있습니다.
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| VQFN (RGT) | 16 | Ultra Librarian |