Advanced Linear Devices ALD1722SAL

The ALD1722/ALD1722G is a monolithic precision low power CMOS operational amplifier intended for a broad range of precision applications requiring exremely low input signal power. Input signal power is the product of input offset voltage and input bias current, which represents the minimum required power draw from the signal source in order to drive the input of the operational amplifier. Input signal power is also a figure of merit in source loading and its associated error, and is a measure of the basic signal resolution possible through the operational amplifier for a given signal source. For certain types of signal sources, signal loading directly translates into a significant distortion or "interface noise equivalent " term. The ALD1722/ALD1722G is designed to set a new standard in low input signal power requirements. The typical input loading at its input is 0.03 mV offset voltage and 0.01 pA input bias current at 25C, resulting in 0.0003 fW input signal power draw. This input characteristic virtually eliminates any loading effects on most types of signal sources, offering unparalled accuracy and signal integrity and fidelity. Obviously, for capacitive and high sensitivity, high impedance signal sources, the ALD1722/ALD1722G is ideally suited. It is readily suited for +5V single supply (or ±2V to ±5V ) systems, with low operating power dissipation, a traditional strength of CMOS technology. It is offered with industry standard pin configuration of μA741 and ICL7611 types. The ALD1722/ALD1722G can operate with rail to rail large signal input and output voltages with relatively high slew rate. The input voltage can be equal to or exceed the positive and negative supply voltages while the output voltage can swing close to these supply voltage rails. This feature significantly reduces the supply overhead voltage required to operate the operational amplifier and allows numerous analog serial stages to operate in a low power supply environment. circuits may operate off the same power supply or battery. This device also features rail-to-rail input and output voltage ranges, tolerance to over-voltage input spikes of 300mV beyond supply rails, high open loop voltage gain, useful bandwidth of 1.5 MHz, slew rate of 2.1 V/μs, and low supply current of 0.8 mA. Finally, the output stage can typically drive up to 400pF capacitive loads in the unity gain mode and up to 4000 pF capacitive load at a gain of 5. These features make the ALD1722/ALD1722G a versatile, high precision operational amplifier that is user friendly and easy to use with virtually no source loading and zero input-loading induced source errors. Additionally, robust design and rigorous screening make this device especially suitable for operation in temperature-extreme environments and rugged conditions.

• Lead Free - RoHS compatible
• Robust high-temperature operation
• Industry standard pinout
• Rail-to-rail input/output
• Exremely low input signal power
• Input bias current of 0.01pA and input offset voltage of 25μv
• No external components
• No internal chopper clocking noise
• No chopper dynamic power dissipation
• Simple and cost effective
• Small package size
• Drive up to 4000pF load capacitance
• Low power
• Suitable for rugged, temperature-extreme environments

• Precision cable driver
• Sensor interface circuits
• Unity gain buffer amplifier
• Precision analog cable driver
• Transducer biasing circuits
• Capacitive and charge integration circuits
• Biochemical probe interface
• Signal conditioning
• Portable instruments
• High source impedance electrode amplifiers
• Precision Sample and Hold amplifiers
• Precision current to voltage converter
• Error correction circuits
• Sensor compensation circuits
• Precision gain amplifiers
• System output level shifter