INA116

® INA 116 INA116 INA 116 Ultra Low Input Bias Current INSTRUMENTATION AMPLIFIER FEATURES q LOW INPUT BIAS CURRENT: 3fA typ q BUFFERED GUARD DRIVE PINS q LOW OFFSET VOLTAGE: 2mV max q HIGH COMMON-MODE REJECTION: 84dB (G = 10) q LOW QUIESCENT CURRENT: 1mA q INPUT OVER-VOLTAGE PROTECTION: ±40V DESCRIPTION The INA116 is a complete monolithic FET-input instrumentation amplifier with extremely low input bias current. Difet ® inputs and special guarding techniques yield input bias currents of 3fA at 25°C, and only 25fA at 85°C. Its 3-op amp topology allows gains to be set from 1 to 1000 by connecting a single external resistor. Guard pins adjacent to both input connections can be used to drive circuit board and input cable guards to maintain extremely low input bias current. The INA116 is available in 16-pin plastic DIP and SOL-16 surface-mount packages, specified for the –40°C to +85°C temperature range. APPLICATIONS q LABORATORY INSTRUMENTATION q pH MEASUREMENT q ION–SPECIFIC PROBES q LEAKAGE CURRENT MEASUREMENT V+ 2 3 4 1 Over-Voltage Protection +1 A1 60kΩ 25kΩ A3 16 Guard + VIN Guard 5 6 7 8 Over-Voltage Protection A2 +1 60kΩ 60kΩ 9 Ref 25kΩ VO 60kΩ G=1+ 50kΩ RG 13 INA116 Guard – VIN Guard RG 11 Difet®; Burr-Brown Corporation V– International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Internet: http://www.burr-brown.com/ FAXLine: (800) ...