ALD1721

Features:

• EPAD ( Electrically Programmable Analog Device)
• User programmable VOS trimmer
• Computer-assisted trimming
• Rail-to-rail input/output
• Compatible with standard EPAD Programmer
• High precision through in-system circuit precision trimming
• Reduces or eliminates VOS, PSRR, CMRR and TCVOS errors
• System level "calibration" capability
• Application Specific Programming mode
• In-System Programming mode
• Electrically programmable to compensate for external component tolerances
• Achieves 0.01pA input bias current and 35mV input offset voltage simultaneously
• Compatible with industry standard pinout


Application

• Sensor interface circuits
• 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
• Periodic In-system calibration
• System output level shifter


Specifications

Supply voltage, V⁺                                                                                                                       13.2V
Differential input voltage range                                                                                                    -0.3V to V⁺ +0.3V
Power dissipation                                                                                                                        600 mW
Operating temperature range PA,SA package                                                                             0°C to +70°C
                                                     DA package                                                                            -55°C to +125°C
Storage temperature range                                                                                                        -65°C to +150°C
Lead temperature, 10 seconds                                                                                                    +260°C


Description

The ALD1721E/ALD1721 is a monolithic rail-to-rail precision CMOS operational amplifier with integrated user programmable EPAD (Electrically Programmable Analog Device) based offset voltage adjustment. The ALD1721E/ALD1721 operational amplifier is a direct replacement of the ALD1701 operational amplifier, with the added feature of user-programmable offset voltage trimming resulting in significantly enhanced total system performance and user flexibility. EPAD technology is an exclusive ALD design which has been refined for analog applications where precision voltage trimming is necessary to achieve a desired performance. ALD1721E/ALD1721 utilizes CMOS FETs as in-circuit elements for trimming of offset voltage bias characteristics with the aid of a personal computer under software control. Once programmed, the set parameters are stored indefinitely within the device even after power-down. EPAD offers the circuit designer
a convenient and cost-effective trimming solution for achieving the very highest amplifier/system performance.

The ALD1721E/ALD1721 operational amplifier features rail-to-rail input and output voltage ranges, tolerance to over-voltage input spikes of 300mV beyond supply rails, capacitive loading up to 50pF, extremely low input currents of 0.01pA typical, high open loop voltage gain, useful bandwidth of 700KHz, slew rate of 0.7 V/ms, and low typical supply current of 120 uA.