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Linear Launches 4GHz Amplifier Achieving Input Bias Current Exceeding 1pA in Temperature Range of –40°C to 85°C
May 14, 2015 – Linear Technology Korea (CEO Hong Sa-kwak) announced the release of two single and dual 4GHz FET input operational amplifiers (product names: LTC6268-10 and LTC6269-10) for high dynamic range and high-speed transimpedance amplifier (TIA) applications. The newly released uncompensated amplifiers extend the speed and dynamic range performance of the very low-bias current operational amplifier family for applications requiring gain of 10 or higher. The input bias current is up to 0.9 pA over a temperature range of –40°C to 85°C and up to only 4 pA over the entire temperature range of –40°C to 125°C. Broadband voltage and current noise are 4 nV/√Hz and 7 fA/√Hz, respectively. Featuring an input capacitance of 0.45 pF and a slew rate of 1000 V/μs, the LTC6268-10 and LTC6269-10 are well-suited for photodiode and PMT (photomultiplier) and high-impedance sensor applications, and are also ideal for driving ADCs (analog-to-digital converters).
The LTC6268-10 datasheet provides circuit and layout techniques to maximize TIA performance, and offers example circuits ranging from a transimpedance gain of 20kΩ at 210MHz to 402kΩ at a bandwidth of 34MHz. The LTC6268-10 is available in a 6-pin SOT23 package, as well as an 8-pin SOIC with guard pins to protect against board leakage current. The LTC6269-10 is available in MSOP-8 packages supporting exposed pads and 3mm x 3mm DFN-10 packages. LTC6268-10 and LTC6269-10 are fully standardized for industrial temperature ranges of –40°C to 85°C and –40°C to 125°C. Based on a quantity of 1,000 units, the price for LTC6268-10 is $2.90 per unit, and the price for LTC6269-10 is set at $4.90. For detailed information, please refer to www.linear.com/product/LTC6268-10 and www.linear.com/product/LTC6269-10.

20kΩ Gain 210MHz Transimpedance Amplifier
Product Features: LTC6268-10 & LTC6269-10
• Gain Bandwidth Product: 4GHz
• Low input bias current
- ±3fA Typ room temperature
- 4pA Max at 125°C
• Current noise (100kHz): 7fA/0Hz
• Voltage Noise (1MHz): 4.0nV/0Hz
• Very low CIN 0.45pF
• Rail-to-rail output
• AV >10
• Slew rate: +1500V/μs, –1000V/μsv>
• Power range: 3.1V ~ 5.25V
• Standby current: 16.5mA
• Operating temperature range: –40°C to 125°C
• Single in 8-pin SO-8 & 6-pin TSOT-23 packages
• 8-pin MS8 3mm x 3mm & 10-pin DFN-10 Package
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