Linear Technology has announced the LTC6091 and LTC6090-5, additions to the LTC6090 family of precision operational amplifiers which operate on a supply voltage up to 140V (±70V). The dual LTC6091 features separate output disable pins, making it useful in high voltage multiplexed applications. The decompensated single LTC6090-5 amplifier offers higher speed and is stable at a gain of 5 or above.
The LTC6090, LTC6090-5, and LTC6091 combine wide supply range, high precision, and low noise. Input offset voltage is 1.25mV max over temperature, and low frequency (1/f) noise is 3.5µVP-P from 0.1Hz to 10Hz. The CMOS input structure keeps the input bias current to 50pA maximum at 85°C, making the LTC6090 family suitable for sensor circuits and other applications requiring high input impedance.
The decompensated LTC6090-5 offers 24MHz gain-bandwidth product and 37V/µs slew rate, compared with 12MHz and 21V/µs for the gain-of-1 stable LTC6090 and LTC6091.
Supply current is 3.9mA per amplifier max. Output short-circuit current is typically ±90mA. A thermal flag pin (TFLAG) signals when the device junction temperature exceeds 145°C. This pin can be connected to the Output Disable pin for active thermal management.
The LTC6090 and LTC6090-1 are available in 8-pin SOIC and 16-pin TSSOP packages. The LTC6091 is offered in a 16-pin 4mm x 6mm QFN package. Each of these packages includes an exposed pad to minimise thermal resistance. Prices start at $3.45 each for the LTC6090 and LTC6090-5, and $6.61 each for the LTC6091 in quantities of 1,000.
The LTC6090 is available in three temperature range grades: 0°C to 70°C, -40°C to 85°C and -40°C to 125°C junction temperature. The LTC6091 is available in -40°C to 85°C and -40°C to 125°C junction temperature grades.
Summary of Features: LTC6091
Supply Range: ±4.75V to ±70V (140V)
0.1Hz to 10Hz Noise: 3.5µVP-P
Input Bias Current: 50pA Maximum
Low Offset Voltage: 1.25mV Maximum
Low Offset Drift: ±5µV/°C Maximum
CMRR: 130dB Minimum
Rail-to-Rail Output Stage
Output Sink & Source: 20mA Minimum
12MHz Gain Bandwidth Product
21V/µs Slew Rate
11nV/vHz Noise Density
Thermal Shutdown
4mm x 6mm 16-Lead QFN Package
Summary of Features: LTC6090-5
Supply Range: ±4.75V to ±70V (140V)
0.1Hz to 10Hz Noise: 3.5µVP-P
Input Bias Current: 50pA Maximum
Low Offset Voltage: 1.25mV Maximum
Low Offset Drift: ±5µV/°C Maximum
CMRR: 130dB Minimum
Rail-to-Rail Output Stage
Output Sink & Source: 50mA Minimum
24MHz Gain Bandwidth Product
37V/µs Slew Rate
11nV/vHz Noise Density
Thermal Shutdown
Available in Thermally Enhanced SOIC-8E or TSSOP-16E Packages
