ALD1722EPA

ALD1722EPA Datasheet

ALD1722E/ALD1722

Part	Datasheet
ALD1722EPA	ALD1722EPA (pdf)

PDF Datasheet Preview
ADVANCED LINEAR DEVICES, INC. EPAD OPERATIONAL AMPLIFIER ALD1722E/ALD1722 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-situ circuit precision trimming • Reduce or eliminate VOS, PSRR, CMRR and TCVOS errors • System level “calibration” capability • In-System Programming capable • Electrically programmable to compensate for external component tolerances • Achieve 0.01pA input bias current and 25µV input offset voltage simultaneously • Compatible with industry standard pinout The ALD1722E/ALD1722 is a monolithic rail-to-rail precision CMOS operational amplifier with integrated user programmable EPAD Electrically Programmable Analog Device based offset voltage adjustment. The ALD1722E/ALD1722 is a direct replacement of the ALD1702 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 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 costeffective trimming solution for achieving the very highest amplifier/system performance. The ALD1722E/ALD1722 operational amplifier features rail-to-rail input and output voltage ranges, tolerance to over-voltage input spikes of 300mV beyond supply rails, high capacitive loading up to 4000pF, extremely low input currents of 0.01pA typical, high open loop voltage gain, useful bandwidth of MHz, slew rate of V/µs, and low supply current of 0.8mA. • 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 • Low power • 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 ORDERING INFORMATION Operating Temperature Range* -55°C to +125°C 0°C to +70°C 0°C to +70°C 8-Pin CERDIP Package 8-Pin Small Outline Package SOIC 8-Pin Plastic Dip Package ALD1722E DA ALD1722 DA ALD1722E SA ALD1722 SA * Contact factory for industrial temperature range ALD1722E PA ALD1722 PA ALD1722E/ALD1722 Advanced Linear Devices VE1 1 8 VE2 -IN 2 +IN 3 V- 4 6 OUT 5 N/C TOP VIEW DA, PA, SA PACKAGE FUNCTIONAL DESCRIPTION The ALD1722E/ALD1722 uses EPADs as in-circuit elements for trimming of offset voltage bias characteristics. Each ALD1722E/ALD1722 has a pair of EPAD-based circuits connected such that one circuit is used to adjust VOS in one direction and the other is used to adjust VOS in the other direction. Functional Description of ALD1722E While each of the EPAD devices is a monotonically adjustable programmable device, the VOS of the ALD1722E 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 ALD1722E provides the user with an operational amplifier that can be trimmed with user application-specific programming or in-system programming conditions. User application-specific circuit programming refers to the situation where the Total Input Offset Voltage of the ALD1722E can be trimmed with the actual intended operating conditions. The ALD1722E 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. For example, an application circuit may have +6V and -2.5V power supplies, and the operational amplifier input is biased at +0.7V, and the average operating temperature is at 55°C. The circuit can be wired up to these conditions within an environmental chamber, and the ALD1722E can be inserted into a test socket connected to this circuit while it is being electrically trimmed. Any error in VOS due to these bias conditions can be automatically zeroed out. The Total VOS error is now limited only by the adjustable range and the stability of VOS, and the input noise voltage of the operational amplifier. Therefore, this Total VOS error now includes VOS as VOS is traditionally specified plus the VOS error contributions from PSRR, CMRR, TCVOS, and noise. Typically this total VOS error term VOST is approximately ± 25µV for the ALD1722E. The VOS contribution due to PSRR, CMRR, TCVOS and external components can be large for operational amplifiers without trimming. Therefore the ALD1722E with EPAD trimming is able to provide much improved system performance by reducing these other sources of error to provide significantly reduced VOST. In-System Programming refers to the condition where the EPAD adjustment is made after the ALD1722E has been inserted into a circuit board. In this case, the circuit design must provide for the ALD1722E to operate in normal mode and in programming mode. One of the benefits of in-system programming is that not only is the ALD1722E offset voltage from operating bias conditions accounted for, any residual errors introduced by other circuit components, such as resistor or sensor induced voltage errors, can also be corrected. In this way, the “in-system” circuit output can be adjusted to a desired level eliminating other trimming components. Functional Description of ALD1722 The ALD1722 is pre-programmed at the factory under standard operating conditions for minimum equivalent input offset voltage. The ALD1722 offers similar programmable features as the ALD1722E, but with more limited offset voltage program range. It is intended for standard operational amplifier applications where little or no electrical programming by the user is necessary. USER PROGRAMMABLE Vos FEATURE Each ALD1722E/ALD1722 has two pins named VE1 and VE2 which are internally connected to an internal offset bias circuit. VE1/VE2 have initial typical values of Volt. The voltage on these pins can be programmed using the ALD E100 EPAD Programmer and the appropriate Adapter Module. The useful programming range of VE1 and VE2 is Volt to Volts. VE1 and VE2 pins are programming pins, used during programming mode. The Programming pin is used during electrical programming to inject charge into the internal EPADs. Increases of VE1 decrease the offset voltage while increases of VE2 increase the offset voltage of the operational amplifier. The injected charge is permanently stored and determines the offset voltage of the operational amplifier. After programming, VE1 and VE2 terminals must be left open to settle on a voltage determined by internal bias currents. During programming, the voltages on VE1 or VE2 are increased incrementally to set the offset voltage of the operational amplifier to the desired VOS. Note that desired VOS can be any value within the offset voltage programmable ranges, and can be either zero, a positive value or a negative value. This VOS value can also be reprogrammed to a different value at a later time, provided that the useful VE1 or VE2 programming voltage range has not been exceeded. VE1 or VE2 pins can also serve as capacitively coupled input pins. Internally, VE1 and VE2 are programmed and connected differentially. Temperature drift effects between the two internal offset bias circuits cancel each other and introduce less net temperature drift coefficient change than offset voltage trimming techniques such as offset adjustment with an external trimmer potentiometer. While programming, V+, VE1 and VE2 pins may be alternately pulsed with 12V approximately pulses generated by the EPAD Programmer. In-system programming requires the ALD1722E/ALD1722 application circuit to accommodate these programming pulses. This can be accomplished by adding resistors at certain appropriate circuit nodes. For more information, see Application Note AN1700. Advanced Linear Devices ALD1722E/ALD1722 ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ Differential input voltage range Power dissipation Operating temperature range PA,SA package DA package Storage temperature range Lead temperature, 10 seconds

PDF Datasheet Preview

ADVANCED LINEAR DEVICES, INC.

EPAD OPERATIONAL AMPLIFIER

ALD1722E/ALD1722

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-situ circuit precision trimming
• Reduce or eliminate VOS, PSRR, CMRR and TCVOS errors
• System level “calibration” capability
• In-System Programming capable
• Electrically programmable to compensate for external
component tolerances
• Achieve 0.01pA input bias current and 25µV
input offset voltage simultaneously
• Compatible with industry standard pinout

The ALD1722E/ALD1722 is a monolithic rail-to-rail precision CMOS operational amplifier with integrated user programmable EPAD Electrically Programmable Analog Device based offset voltage adjustment. The ALD1722E/ALD1722 is a direct replacement of the ALD1702 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 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 costeffective trimming solution for achieving the very highest amplifier/system performance.

The ALD1722E/ALD1722 operational amplifier features rail-to-rail input and output voltage ranges, tolerance to over-voltage input spikes of 300mV beyond supply rails, high capacitive loading up to 4000pF, extremely low input currents of 0.01pA typical, high open loop voltage gain, useful bandwidth of MHz, slew rate of V/µs, and low supply current of 0.8mA.
• 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
• Low power
• 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
ORDERING INFORMATION

Operating Temperature Range*
-55°C to +125°C
0°C to +70°C
0°C to +70°C
8-Pin CERDIP Package
8-Pin Small Outline Package SOIC
8-Pin Plastic Dip Package

ALD1722E DA ALD1722 DA

ALD1722E SA ALD1722 SA
* Contact factory for industrial temperature range

ALD1722E PA ALD1722 PA

ALD1722E/ALD1722

Advanced Linear Devices

VE1 1
8 VE2
-IN 2
+IN 3 V- 4
6 OUT 5 N/C

TOP VIEW DA, PA, SA PACKAGE

FUNCTIONAL DESCRIPTION

The ALD1722E/ALD1722 uses EPADs as in-circuit elements for trimming of offset voltage bias characteristics. Each ALD1722E/ALD1722 has a pair of EPAD-based circuits connected such that one circuit is used to adjust VOS in one direction and the other is used to adjust VOS in the other direction.

Functional Description of ALD1722E

While each of the EPAD devices is a monotonically adjustable programmable device, the VOS of the ALD1722E 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 ALD1722E provides the user with an operational amplifier that can be trimmed with user application-specific programming or in-system programming conditions. User application-specific circuit programming refers to the situation where the Total Input Offset Voltage of the ALD1722E can be trimmed with the actual intended operating conditions.

The ALD1722E 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.

For example, an application circuit may have +6V and -2.5V power supplies, and the operational amplifier input is biased at +0.7V, and the average operating temperature is at 55°C. The circuit can be wired up to these conditions within an environmental chamber, and the ALD1722E can be inserted into a test socket connected to this circuit while it is being electrically trimmed. Any error in VOS due to these bias conditions can be automatically zeroed out. The Total VOS error is now limited only by the adjustable range and the stability of VOS, and the input noise voltage of the operational amplifier. Therefore, this Total VOS error now includes VOS as VOS is traditionally specified plus the VOS error contributions from PSRR, CMRR, TCVOS, and noise. Typically this total VOS error term VOST is approximately ± 25µV for the ALD1722E.

The VOS contribution due to PSRR, CMRR, TCVOS and external components can be large for operational amplifiers without trimming. Therefore the ALD1722E with EPAD trimming is able to provide much improved system performance by reducing these other sources of error to provide significantly reduced VOST.

In-System Programming refers to the condition where the EPAD adjustment is made after the ALD1722E has been inserted into a circuit board. In this case, the circuit design must provide for the ALD1722E to operate in normal mode and in programming mode. One of the benefits of in-system programming is that not only is the ALD1722E offset voltage from operating bias conditions accounted for, any residual errors introduced by other circuit components, such as resistor or sensor induced voltage errors, can also be corrected. In this way, the “in-system” circuit output can be adjusted to a desired level eliminating other trimming components.

Functional Description of ALD1722

The ALD1722 is pre-programmed at the factory under standard operating conditions for minimum equivalent input offset voltage. The ALD1722 offers similar programmable features as the ALD1722E, but with more limited offset voltage program range. It is intended for standard operational amplifier applications where little or no electrical programming by the user is necessary.

USER PROGRAMMABLE Vos FEATURE

Each ALD1722E/ALD1722 has two pins named VE1 and VE2 which are internally connected to an internal offset bias circuit. VE1/VE2 have initial typical values of Volt. The voltage on these pins can be programmed using the ALD E100 EPAD Programmer and the appropriate Adapter Module. The useful programming range of VE1 and VE2 is Volt to Volts. VE1 and VE2 pins are programming pins, used during programming mode. The Programming pin is used during electrical programming to inject charge into the internal EPADs. Increases of VE1 decrease the offset voltage while increases of VE2 increase the offset voltage of the operational amplifier. The injected charge is permanently stored and determines the offset voltage of the operational amplifier. After programming, VE1 and VE2 terminals must be left open to settle on a voltage determined by internal bias currents.

During programming, the voltages on VE1 or VE2 are increased incrementally to set the offset voltage of the operational amplifier to the desired VOS. Note that desired VOS can be any value within the offset voltage programmable ranges, and can be either zero, a positive value or a negative value. This VOS value can also be reprogrammed to a different value at a later time, provided that the useful VE1 or VE2 programming voltage range has not been exceeded. VE1 or VE2 pins can also serve as capacitively coupled input pins.

Internally, VE1 and VE2 are programmed and connected differentially. Temperature drift effects between the two internal offset bias circuits cancel each other and introduce less net temperature drift coefficient change than offset voltage trimming techniques such as offset adjustment with an external trimmer potentiometer.

While programming, V+, VE1 and VE2 pins may be alternately pulsed with 12V approximately pulses generated by the EPAD Programmer. In-system programming requires the ALD1722E/ALD1722 application circuit to accommodate these programming pulses. This can be accomplished by adding resistors at certain appropriate circuit nodes. For more information, see Application Note AN1700.

Advanced Linear Devices

ALD1722E/ALD1722

ABSOLUTE MAXIMUM RATINGS

Supply voltage, V+ Differential input voltage range Power dissipation Operating temperature range PA,SA package

DA package Storage temperature range Lead temperature, 10 seconds

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Datasheet ID: ALD1722EPA 515542