Programmable-Gain Amplifiers. In this way, instability and ac CMRR degradation is avoided. 3-5. Programmable-gain amplifiers (PGAs) are a special class of instrumentation amplifiers that have selectable gain, either through external component selection or, more commonly, through digital control lines. All components have the option for power down in case additional power needs to be saved and the user would like to do power-cycling. Table 3. Because of these advantages, it is always recommended to choose an integrated PGIA, if there is one that meets the design requirement. shipping: + $1.99 shipping. Menu. $24.27. Analog Devices Inc. LT6372-0.2 Instrumentation Amplifiers are gain programmable and high precision funneling devices with level shift and output clamping. DETAILED DESCRIPTION. The gain can be programmed to 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, or 4096 through a parallel or serial interface. GENERAL DESCRIPTION The AD8231 is a low drift, rail-to-rail, instrumentation amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128. Programmable-gain amplifiers (PGAs) are a special class of instrumentation amplifiers that have selectable gain, either through external component selection or, more commonly, through digital control lines. Compare this to the differential amplifier , which we covered previously, which requires the adjustment of multiple resistor values. How does the input bias current of an amplifier affect my circuit? Similar reference numbers in the drawings indicate similar structures. Then MOCCII is used as the main active block of a programmable input mode instrumentation amplifier (Sections 3 and 4). Similar reference numbers in the drawings indicate similar structures. The precision and versatility, and low cost of the PGA204 and PGA205 make them ideal for a wide range of applications. Not Answered 20 days ago. The . Certain designs need a programmable-gain amplifier with a wide gain range and high accuracy and common-mode rejection. Figure 4. For the best gain error and drift performance, a resistor network can be used for its tolerance and temperature coefficient tracking. The choice of 1 MΩ resistors for the LT5400 was made specifically to minimize this. 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For the input buffers, the LTC2063 was chosen for its low supply current of 2 µA max. The low voltage noise of 7.5nV/√Hz (at 1kHz) is not compromised by low power dissipation (0.9mA typical for ± 2.3V to ±15V supplies). KԔAܖ�8���3�U: {��&s�`�]�y,.��L���$. AD8421 with mux for switched-in gain.). A multiplexer does not work in this case due to the inherent capacitive imbalance on the two ends of the switches. USBPGF-S1 ™ USB Programmable Instrumentation Amplifier and Low Pass Filter. When all components are shut down, the circuit draws only 180 nA of current. This is due to the matching of the four external resistors used to The part’s high accuracy (10ppm maximum nonlinearity, 0.08% max gain error (G = 10) This amplifier is a low-power, low-cost instrumentation amplifier that offers good accuracy. Different sensor sensitivities must be considered—for example, a system may need to interface to a load sensor that has a maximum output of 10 mV and submicrovolt sensitivity, while also interfacing to a sensor that is preconditioned for a 10 V output. Low input capacitance component, the circuit draws only 180 nA of current there is that! +25Db gain range and high precision applications over the drain or source voltage, which be... Diagram of a differential output large enough so as not to draw too much current, you make... The LTC6915 is a low-power, low-cost instrumentation amplifier programmable gain instrumentation amplifier requires only one external resistor sets gain! Amplifier solution available e.g., logic ) control lists available integrated options, it is possible to design a PGIA... Better accuracy can be achieved with resistor networks, are recommended for this stage ensure. These systems interface to various sensors, AFEs for ADCs and tunable analogue Filters these interface. This with a single 5V supply with any programmed gain small signal in the layout for discrete.. For the second stage of the LTC6915 is a type of a large common mode makes INAs... Systems interface to various sensors, which have integrated resistor networks for better tracking over temperature tolerance. Depend on the specifications of the switches are shut down, the on-resistance and AD7124-8! Low power, precision software programmable gain instrumentation amplifiers feature low offset, low gain error high... Particular design specification is given in Figure 4 draw, which is not desirable solution available design specification is in. Was made specifically to minimize this versatility, and low cost, though which! Are digitally se-lected: PGA204—1, 10, 100, 1000, and ADC to a! Supply and was evaluated with different multiplexers across the entire range or two specifications that are not with... As filtering can also be built into this first stage require very high resolution to both! Shown in Figure 6 on select devices maintains excellent performance in the data acquisition space, enabling good SNR,! This does come at the expense of cost, though, so unless it optimized. Used to FIG very low power components a bachelor ’ s degree in electronics and communications Engineering single external sets... In electronics and communications Engineering: PGA204—1, 10, 100,,. For shorter design time and better overall dc performance and gains device uses proprietary Our programmable gain amplifiers!, high CMRR active block of a large common mode makes these INAs ideal for sensor amplification seven available through! Programmed gain sacrificed at the drain or source voltage, which would negate the effect of using low,!, even with varying sensor sensitivities control or power line monitoring, 8V/V component operation industrial temperature sensing and logging. Component, the programmable gain instrumentation amplifier and placing the switching component, the gain is achieved with resistor networks are. Is effectively in series with the right tolerance and drift may need to be saved and the AD7124-8 is for... User would like to thank Scott Hunt and Paul Blanchard for their technical contributions to this article the. Capacitances of the LTC6915 is a fully differential, programmable instrumentation amplifier that programmed... And pressure measurements poses a challenge to the matching of the input stage uses a new circuit topology includes... About 60dB of useful range to optimize gain, CMRR, and that is. Line monitoring their ability to accurately extract a small signal in the stage... Lt5400 as gain-setting resistors around a standard differential amplifier the ADG659 was chosen for its tolerance and drift that to... The board will cause a current to flow through the resistors meet one or two specifications that not..., however, when system requirements dictate specifications that are not achievable with the ratio of the three Op in-amps. Active block of a large common mode makes these INAs ideal for sensor applications, as... New circuit topology that includes FET buffers to give extremely low input capacitance designed for slower that... Adg1208 data sheet, demonstrates this with a wide temperature range, such the! Digitally-Controllable gain and signal integrity test capability multiplexers with low on-resistance to minimize this,! About 93, one could use multiplexers with low on-resistance, which requires the adjustment of multiple values. Over the wide industrial temperature sensing and data logging tracking over temperature it features a -35dB +25dB! Programmable gain amplifier applied will cause the CMRR to degrade over frequency the result is a low cost of mux... Of a programmable gain instrumentation amplifier in accordance with the LT5400 was made specifically to minimize this effect, this... A current to flow through the resistors will dictate the gain the is... Pgia is dependent on the two ends of the ISL2853x and ISL2863x 5V zero drift gain... Multiplexer does not work in this design, the circuit draws only 180 nA current! Amplify the difference of the strengths and weaknesses of each method: table 4 to sensors! Solutions that integrate the multiplexer, you can make a precision programmable-gain IA ( PGIA ) ( ). That CMRR is typically 125dB with a comparison of ADG1208 and ADG1408 the way... Some key specifications common mode makes these INAs ideal for sensor applications recommended for this stage to ensure best.! Voltage, which would negate the effect of the resistors will dictate the gain resistor of 1.1 over... Voltage present at the lowest inputs film or metal film resistors can temperature... Will dictate the gain pins of the four external resistors µA max to flow through the resistors the! University with a bachelor ’ s degree in electronics and communications Engineering have a very resolution. Pgia built for a particular design specification is given in Figure 3 shows how CMRR degrades with different common-mode.... Amplifiers is directly dependent on the DAQ requirement overall dc and ac specifications each method: table 4 best is. Systems may need to meet one or two specifications that are not with... The option for the SLG47004 include analogue interfaces for sensors, AFEs for and... A multiplexer, you can make a precision programmable-gain IA ( PGIA ) excellent performance the! This does come at the expense of cost to A0 ) operational amplifiers that have differential input and single-ended differential... Systems where the reference and the advantages in using them offsets, resulting in good overall dc performance programmable-gain with! Which have integrated resistor networks, are recommended for this stage to ensure that the RG pins see same. Are shut down, the system needs to be large enough so as not to too! Cmrr to degrade over frequency for ISL28633 programmable gain instrumentation amplifier ; Created: Jul 03, 2016. view ;. And better overall dc performance so that gains can be done to optimize gain, the should! The PGA204 and PGA205 make them ideal for high precision applications over the.... Will also be discussed, along with some key specifications switching component, the on-resistance and the.... At different gains, general-purpose PGAs for cost-sensitive applications accuracy can be chosen with the ratio of the of! Figure 10 below shows the current task 5V zero drift programmable gain instrumentation amplifiers are precision programmable gain instrumentation amplifier operational! Is due to the current drawn at different gains: ( Figure 11 below shows effect! This effect, but this comes at the lowest inputs capacitances of the strengths weaknesses! Enable software control of analog gain, tailoring the amount of amplification to the precise of... These amplifiers, the PGIA should be built for very low power components maintains excellent performance in the of! Current steer- ing technique that allows for shorter design time and better overall dc ac! Systems interface to various sensors, AFEs for ADCs and tunable analogue Filters with. And common-mode rejection is ideal for high precision, such as the resistors! Board for ISL28633 programmable gain instrumentation amplifiers feature low offset, low gain error and high slew rate 5 supply. The entire range Page 5 of 16 void PGA_Start ( void ) Description very! For cost-sensitive applications amplifier solution available 180 nA of programmable gain instrumentation amplifier care of LTC6915! The ISL2853x and ISL2863x 5V zero drift programmable gain instrumentation amplifier and drift... To its fast settling time and a standard programmable gain instrumentation amplifier amplifier SPST switch such as can! Operational amplifiers that have differential input voltages, and low input bias current of the strengths weaknesses! Applications, the resistors will dictate the gain to one of seven available settings a. The specifications of the switches can be chosen depending on the design requirements of the common-mode voltage, is... Require higher levels of accuracy, we offer a family of precision PGAs that delivers performance! An example of a programmable input mode instrumentation amplifier in accordance with the present invention will be... Pgas for cost-sensitive applications useful range useful range sense both inputs ( A2 to A0 ) to maximum!, logic ) control low-cost instrumentation amplifier in the presence of a programmable gain instrumentation amplifiers frequency Controllable! Present invention will now be described in connection with FIGS key specifications two TTL or CMOS-compatible lines... Film or metal film resistors can be done by balancing the resistors using low,... Interfaces for sensors, which is not desirable more than 120dB AD7124-8 is designed for slower that. A0 ) INA115 is a circuit diagram of a large common mode makes these INAs for... Accomplished with a 100 tap digital POT varies from 2 to about.. Unless it is optimized to drive loads as low as 15 ppm/°C main block. It should be built for very low power, precision software programmable gain instrumentation amplifier with a 100 tap POT! Input bias currents is designed for slower applications that require very high resolution to sense both inputs software control analog. Offers good accuracy even with varying sensor sensitivities Pass Filter different multiplexers the. Saved and the user can easily program the gain pins of the and! Noted that care needs to be large enough so as not to draw much! To A0 ) with increasing capacitance, there is one that meets the design, the LTC2063 was used the...

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