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ALD1721E Dataheets PDF



Part Number ALD1721E
Manufacturers Advanced Linear Devices
Logo Advanced Linear Devices
Description EPAD MICROPOWER OPERATIONAL AMPLIFIER
Datasheet ALD1721E DatasheetALD1721E Datasheet (PDF)

ADVANCED LINEAR DEVICES, INC. EPAD® MICROPOWER CMOS OPERATIONAL AMPLIFIER TM e® EPAD D E L B A N E ALD1721E KEY 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 mo.

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ADVANCED LINEAR DEVICES, INC. EPAD® MICROPOWER CMOS OPERATIONAL AMPLIFIER TM e® EPAD D E L B A N E ALD1721E KEY 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 35µV input offset voltage simultaneously • Compatible with industry standard pinout BENEFITS • Eliminates manual and elaborate system trimming procedures • Remote controlled automated trimming • In-System Programming capability • No external components • No internal chopper clocking noise • No chopper dynamic power dissipation • Simple and cost effective • Small package size • Extremely small total functional volume size • Low system implementation cost • Micropower and Low Voltage GENERAL DESCRIPTION The ALD1721E 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 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. It utilizes CMOS FETs as incircuit 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 powerdown. EPAD offers the circuit designer a convenient and cost-effective trimming solution for achieving the very highest amplifier/system performance. The ALD1721E 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 0.7V/µs, and low typical supply current of 120µA. ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS)) Operating Temperature Range 0°C to +70°C 0°C to +70°C -55°C to +125°C 8-Pin Small Outline Package (SOIC) 8-Pin Plastic Dip Package 8-Pin CERDIP Package ALD1721ESAL ALD1721EPAL ALD1721EDA * Contact factory for leaded (non-RoHS) or high temperature versions. APPLICATIONS • 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 PIN CONFIGURATION VE1 1 -IN 2 2 8 VE2 7 V+ +IN 3 6 OUT V- 4 5 N/C TOP VIEW SAL, PAL, DA PACKAGES * N/C Pin is internally connected. Do not connect externally. Rev 2.1 ©2011 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286 www.aldinc.com FUNCTIONAL DESCRIPTION The ALD1721E uses EPADs as in-circuit elements for trimming of offset voltage bias characteristics. Each ALD1721E has a pair of EPAD-based circuits connected such that one circuit is used to adjust VOS in one direction and the other circuit is used to adjust VOS in the other direction. While each of the EPAD devices is a monotonically adjustable programmable device, the VOS of the ALD1721E can be adjusted many times in both directions. Once programmed, the set VOS levels are stored permanently, even when the device power is removed. The ALD1721E is pre-programmed at the factory under standard operating conditions for minimum equivalent input offset voltage. It also has a guaranteed offset voltage program range, which is ideal for applications that require electrical offset voltage programming. The ALD1721E is an operational amplifier that can be trimmed with user application-specific programming or insystem programming conditions. User application-specific circuit programming refers to the situation where the Total Input Offset Voltage of the ALD1721E can be trimmed with the actual intended operating conditions. For example, an application circuit may have +6V and -2.5V power supplies, and the operational amplifier input is bia.


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