LOG200
- Ultra-fast transient response to low current levels:
- Settling time for 10nA to 100nA step: 240ns rising, 620ns falling (typ)
- Settling time for 100nA to 1µA step: 60ns rising, 150ns falling (typ)
- Wide dynamic range: 10pA to 10mA (180dB)
- Specified from 100pA to 10mA (160dB)
- High signal bandwidth:
- 20MHz at 10µA to 10mA
- 6.3MHz at 1µA
- 90kHz at 1nA
- High-accuracy transfer function:
- 0.2% max log conformity error (10nA to 100µA)
- Integrated reference current (1µA) and reference voltages (2.5V and 1.65V)
- Additional auxiliary high-speed op amp for differential ADC drive, single-ended gain or filter blocks, and other peripheral functions
- Single supply (4.5V to 12.6V) or dual supply (±2.25V to ±6.3V) operation
- Specified temperature range: –40°C to +125°C
- Small package options:
- 3mm × 3mm VQFN
- 1.6mm × 1.6mm DSBGA
The LOG200 is a wide-dynamic-range current-to-voltage amplifier specifically designed to optimize current measurements across 160dB of dynamic range with unparalleled accuracy and speed for optical communications, medical diagnostics, and industrial process-control measurements. The LOG200 features two logarithmic amplifiers followed by a high-accuracy differential amplifier that convert current signals into a voltage representing the log-compressed ratio of the two currents. The current inputs are designed to feature a high-speed response from one input, and a highly accurate reference signal on the other input, allowing for a unique combination of fast transient response and high logarithmic conformity.
The LOG200 ratio is internally set to 250mV/decade of current-to-voltage conversion. The device integrates an uncommitted high-speed amplifier to allow the output to be configured for differential or filtered responses, with a fast settling time to drive successive approximation analog-to-digital converters (SAR ADCs). The LOG200 also features a separate reference current and reference voltage designed to configure the device for optimized input current and common-mode voltages.
The LOG200 can be powered in a single-supply (4.5V to 12.6V) or dual-supply (±2.25V to ±6.3V) configuration and is specified from –40°C to +125°C.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | LOG200 Precision, High-Speed Logarithmic Amplifier With Integrated Photodiode Bias データシート (Rev. B) | PDF | HTML | 2026/08/06 | ||
| アプリケーション・ノート | Perform Accurate Optical Current Sense Measurements Using the LOG200 Logarithmic Amplifier | PDF | HTML | 2025/01/21 | |||
| 証明書 | LOG200EVM EU Declaration of Conformity (DoC) | 2023/06/30 |
設計と開発
その他のアイテムや必要なリソースを参照するには、以下のタイトルをクリックして詳細ページをご覧ください。
LOG200EVM — LOG200 評価基板
LOG200 評価基板 (EVM) は、フォトダイオード バイアスと暗電流補正機能を搭載した高精度の高速対数アンプである LOG200 を評価するための開発プラットフォームです。LOG200 は、160dB のダイナミック レンジで卓越した精度の電流測定を行えるうように最適化されています。
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| VQFN (RGT) | 16 | Ultra Librarian |