ALD4704B

Features:

• Rail-to-rail input and output voltage ranges
• 5.0V/ms slew rate
• Symmetrical push-pull output drive
• Inputs can extend beyond supply rails by 300mV
• Outputs settle to 2mV of supply rails
• High capacitive load capability -- up to 4000pF
• No frequency compensation required unity gain stable
• Extremely low input bias currents -- 1.0pA typical (20pA max.)
• Ideal for high source impedance applications
• High voltage gain -- typically 100V/mV
• Output short circuit protected
• Unity gain bandwidth of 2.1MHz


Application

• Voltage amplifier
• Voltage follower/buffer
• Charge integrator
• Photodiode amplifier
• Data acquisition systems
• High performance portable instruments
• Signal conditioning circuits
• Low leakage amplifiers
• Active filters
• Sample/Hold amplifier
• Picoammeter
• Current to voltage converter
• Coaxial cable driver
• Capacitive sensor amplifier
• Piezoelectric transducer amplifier


Specifications

Supply voltage, V+ referenced to V^-                                          -0.3V to V++13.2V
Supply voltage, VS referenced to V^-                                          ±6.6V
Differential input voltage range                                                -0.3V to V⁺ +0.3V
Power dissipation 600 mW
Operating temperature range PB, SB package                         0°C to +70°C
                                                     DB package                          -55°C to +125°C
Storage temperature range                                                     -65°C to +150°C
Lead temperature, 10 seconds                                               +260°C


Description

The ALD4704 is a quad CMOS monolithic operational amplifier with MOSFET input that has rail-to-rail input and output voltage ranges. The input voltage can be beyond positive power supply voltage V+ or the negative power supply voltage V- by up to 300mV. The output voltage swings to within 60mV of either positive or negative power supply voltages at rated load.

With high impedance load, the output voltage approaches to within 1mV of the power supply rails. This device is designed as an alternative to the popular J-FET input operational amplifiers in applications where lower operating voltages, such as 9V battery or ±3.25V to ±6V power supplies are being used.  ALD4704  offers high slew rate of 5V/ms at low operating power. The ALD4704 is designed and manufactured with Advanced Linear Devices' standard enhanced ACMOS silicon gate CMOS process for low unit cost and exceptional reliability.

The rail-to-rail input and output feature of the ALD4704 expand signal voltage range for a given operating supply voltage and allow numerous analog serial stages to be implemented without losing operating voltage margin. The output stage is designed to drive up to 10mA into 400pF capacitive and 1.5KW resistive loads at unity gain and up to 4000pF at a gain of 5. Short circuit protection to either ground or the power supply rails is at approximately 15mA clamp current. The output of  ALD4704 can both source and sink 10mA into a load with symmetrical drive and is ideally suited for applications where push-pull voltage drive is desired.