AD546 Datasheet | Analog Devices

a Features DC PERFORMANCE 1 m V max Input Offset Voltage Low Offset Drift: 20 ␮V/؇ C 1 p A max Input Bias Current Input Bias Current Guaranteed Over Full mon-Mode Voltage Range AC PERFORMANCE 3 V/␮s Slew Rate 1 MHz Unity Gain Bandwidth Low Input Voltage Noise: 4 ␮V p-p, 0.1 Hz to 10 Hz Available in a Low Cost, 8-Pin Plastic Mini-DIP Standard Op Amp Pinout APPLICATIONS Electrometer Amplifiers Photodiode Preamps p H Electrode Buffers Log Ratio Amplifiers 1 p A Monolithic Electrometer Operational Amplifier AD546- CONNECTION DIAGRAM 8-Pin Plastic Mini-DIP Package PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS The AD546 is a monolithic electrometer bining the virtues of low (1 p A) input bias current with the cost effectiveness of a plastic mini-DIP package. Both input offset voltage and input offset voltage drift are laser trimmed, providing very high performance for such a low cost amplifier. Input bias currents are reduced significantly by using “topgate” JFET technology. The 1015 Ω mon-mode impedance, resulting from a bootstrapped input stage, insures that input bias current is essentially independent of mon-mode voltage variations. The AD546 is suitable for applications requiring both minimal levels of input bias current and low input offset voltage. Applications for the AD546 include use as a buffer amplifier for current output transducers such as photodiodes and p H probes. It may also be used as a precision integrator or as a low droop rate sample and hold amplifier. The AD546 is pin patible with standard op amps; its plastic mini-DIP package is ideal for use with automatic insertion equipment. The AD546 is available in two performance grades, all rated over the 0°C to +70°C mercial temperature range, and packaged in an 8-pin plastic mini-DIP. - Covered by Patent No. 4,639,683. 1. The input bias current of the AD546 is specified, 100% tested and guaranteed with the device in the fully warmed-up condition. 2. The input offset voltage of the AD546 is...