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The author would like to thank Scott Hunt and Paul Blanchard for their technical contributions to this article. The LTC6915 is a precision programmable gain instrumentation amplifier. DETAILED DESCRIPTION. 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The choice of 1 MΩ resistors for the LT5400 was made specifically to minimize this. The AD7124-8 is designed for slower applications that require very high precision, such as temperature and pressure measurements. 2) Circuits requiring a low cost, precision software programmable gain amplifier. By following the right design recommendations, the optimal design can be achieved even with a discrete approach, and the various implementations can be assessed to determine the best configuration in a specific application. shipping: + $1.99 shipping. The ISL28533, ISL28534, ISL28535, ISL28633, ISL28634 and ISL28635 are 5V zero-drift rail-to-rail input/output Programmable Gain Instrumentation Amplifiers (PGIA). 3-5. Going back to the initial example, with the AD8421 in a gain of 10 and a gain resistor of 1.1 kΩ, the switch would introduce only 0.1% of gain nonlinearity. They are used in data acquisition systems to enable software control of analog gain, tailoring the amount of amplification to the current task. \�GpEr}O���Ƴ���)������m̜nԞ��(0P�\Z@�K����/�`to��Z װ�C���h��Ԋ�$�e �,��#X�t�� This reference design is a simple evaluation board for ISL28633 programmable gain input amplifier. A fixed gain instrumentation amplifier would have about 60dB of useful range. (Figure 6. Our Instrumentation Amplifiers (INAs) include internal matched feedback and are ideal for data acquisition applications. Table 3. "L�9x�`��@;g�� *A Page 5 of 16 void PGA_Start(void) Description: This is the preferred method to begin component operation. The DS4420 is a fully differential, programmable gain amplifier for audio applications. The input stage uses a new circuit topology that includes FET buffers to give extremely low input bias currents. Les meilleures offres pour Nouveau AD8221AR MSOP Gain Programmable Precision instrumentation Amplificateur Module sont sur eBay Comparez les prix et les spécificités des produits neufs et d'occasion Pleins d'articles en livraison gratuite! They do, however, consume more power in comparison to the AD7124-8. This does come at the expense of cost, though, so unless it is needed, discrete resistors are preferred. ��G�Xs�AL���fg�Ԋe���ĺ��*{�+��K� =����#=6%�5d�h��� ���,Ӑ�+�k��� Ԙ2� How does the input bias current of an amplifier affect my circuit? In order to eliminate the parasitic resistance effects of the switch, an in-amp with a different architecture can be used to implement arbitrary gains. Variable gain amplifiers to meet your varying performance requirements Gains up to 1000V/V and bandwidths to 4.5GHz - get the right gain at the right time We offer a wide range of variable and programmable gain amplifiers capable of improving the dynamic range of a circuit with the ability to adjust the amplitude of the signal in real time. It uses, as the output stage, a current amplifier reported in [11]. In portable, battery-powered applications, this circuit would be extremely useful and the key specification would not otherwise have been achieved with an integrated PGIA. Instrumentation Amplifier Circuit Instrumentation Amplifier … Similar to the Op-amp circuit, the input buffer amplifiers (Op-amp 1 and Op-amp 2) of the Instrumentation Amplifier pass the common-mode signal through at unity gain. For the input buffers, the LTC2063 was chosen for its low supply current of 2 µA max. The user can easily program the gain to one of seven available settings through a 3-bit parallel interface (A2 to A0). The gains are programmed via digital logic or pin KԔAܖ�8���3�U: {��&s�`�]�y,.��L���$. (Figure 5. This does not vary, even if variables such as common-mode voltage, reference, and differential inputs are changed, for as long as they are all kept within the supply. IDT IDT7134LA20PDG High Speed 4K x 8 Dual Port SRAM PDIP48x5PCS. 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). The LTC6373 is a precision instrumentation amplifier with fully differential outputs which includes a highly-matched internal resistor network to achieve excellent CMRR and extremely low gain error, gain drift, and gain nonlinearity. Programmable-gain instrumentation amplifier . Programmable gain instrumentation amplifiers are specialized in-amps that have fixed gain levels. The use of integrated PGIAs allows for shorter design time and better … Community Blogs EngineerZone Spotlight; The Engineering Mind; More; Cancel; Open Questions AD8338. For the best gain error and drift performance, a resistor network can be used for its tolerance and temperature coefficient tracking. There is a much larger variety of operational amplifiers to choose from compared to instrumentation amplifiers, so designers have more choices, which allows them to design around a specific design requirement. New Programmable Gain Instrumentation Amp The ADA4254 is a zero drift, high voltage, low power programmable gain instrumentation amplifier (PGIA), designed for process control and industrial applications. There are also a number of component solutions that integrate the multiplexer, PGIA, and ADC to form a complete DAQ solution. The second stage of the three op amp in-amps takes care of the rejection of common-mode voltages. Limitations will also be discussed, along with guidelines for building a discrete PGIA when trying to meet a specific requirement. H�lV�n[7���m���KGm��y ��,��n���\��"��y���dxa�#r�����9�Ó���t0��L�Z�Z��l���w�����a����r6��mM�.V�[tl��R�w�G�ߟ�ɼ:���h�=~6�a��b�.d�cu���=��]�y#���y�}@{�f�{�����͇�o������<���;��ػ����h����ƻ���a�>R�Η`SM.��A$3R����4�f�o.ƶ���%�? The digitally adjustable gain is achieved with internal precision resistor arrays. Gain switching is accomplished with a novel current steer- ing technique that allows for fast settling when changing gains. 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. They are used in data acquisition systems to enable software control of analog gain, tailoring the amount of amplification to the current task. Programmable gain instrumentation amplifiers are a critical component in the data acquisition space, enabling good SNR performance, even with varying sensor sensitivities. 69 0 obj << /Linearized 1 /O 71 /H [ 1823 803 ] /L 474931 /E 61800 /N 15 /T 473433 >> endobj xref 69 71 0000000016 00000 n 0000001768 00000 n 0000002626 00000 n 0000002837 00000 n 0000003122 00000 n 0000003914 00000 n 0000004094 00000 n 0000004549 00000 n 0000004571 00000 n 0000005659 00000 n 0000005680 00000 n 0000006671 00000 n 0000007521 00000 n 0000007995 00000 n 0000008016 00000 n 0000009078 00000 n 0000009903 00000 n 0000010125 00000 n 0000010238 00000 n 0000010507 00000 n 0000010804 00000 n 0000010825 00000 n 0000011783 00000 n 0000012195 00000 n 0000013055 00000 n 0000013640 00000 n 0000014342 00000 n 0000014686 00000 n 0000019707 00000 n 0000024750 00000 n 0000024964 00000 n 0000025320 00000 n 0000025785 00000 n 0000026243 00000 n 0000026958 00000 n 0000027422 00000 n 0000027974 00000 n 0000028042 00000 n 0000028305 00000 n 0000028510 00000 n 0000028756 00000 n 0000029065 00000 n 0000030494 00000 n 0000030696 00000 n 0000031147 00000 n 0000031532 00000 n 0000031872 00000 n 0000031894 00000 n 0000032867 00000 n 0000033718 00000 n 0000034298 00000 n 0000034321 00000 n 0000035725 00000 n 0000036349 00000 n 0000036606 00000 n 0000036814 00000 n 0000037124 00000 n 0000037913 00000 n 0000037981 00000 n 0000038004 00000 n 0000039238 00000 n 0000039261 00000 n 0000040369 00000 n 0000040448 00000 n 0000040526 00000 n 0000046355 00000 n 0000053437 00000 n 0000056728 00000 n 0000057540 00000 n 0000001823 00000 n 0000002604 00000 n trailer << /Size 140 /Info 68 0 R /Root 70 0 R /Prev 473423 /ID[<88e7acf231c8d765b897924c482a76c4><88e7acf231c8d765b897924c482a76c4>] >> startxref 0 %%EOF 70 0 obj << /Type /Catalog /Pages 66 0 R >> endobj 138 0 obj << /S 786 /Filter /FlateDecode /Length 139 0 R >> stream The digital logic is used to apply one of multiple “on-chip” gain … The user can easily program the gain to one of seven available settings through a 3-bit parallel interface (A2 to A0). Now available at Mouser. It should be noted that care needs to be practiced in the layout for discrete PGIAs. DETAILED DESCRIPTION. The MAX9939 is a general-purpose, differential-input programmable-gain amplifier (PGA) that is ideal for conditioning a variety of wide dynamic range signals such as those found in motor current-sense, medical instrumentation, and sonar data acquisition applications. The gain is adjustable in 3dB increments across the entire range. Another solution, and the one that provides the most flexibility, is the three op amp in-amp architecture with discrete components, as shown in Figure 8, with multiplexers to switch in gain resistors. The choice of PGIA is dependent on the application. quiring nonstandard gains (i.e., gains not easily achievable with devices such as the AD524 and AD624). Gain AD8221 AD6231 AD628 AD620 AD6271 AD82311 AD82201 AD85531 AD629 AD621 AD8250 AD8222 AD524 AD8251 AD82241 AD526 AD85551 AD624 AD85561 AD85571 1 Rail-to-rail output. For low noise, high CMRR, and low drift the AD625JN is the most cost effective instrumentation amplifier solution available. Analog Devices Inc. LT6372-0.2 Instrumentation Amplifiers are gain programmable and high precision funneling devices with level shift and output clamping. The use of integrated PGIAs allows for shorter design time and better overall dc and ac performance for the front end. 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. The part’s high accuracy (10ppm maximum nonlinearity, 0.08% max gain error (G = 10) Programmable-Gain Amplifiers. �+��p���6�f0e*.+"�� j�0�� �� ���%EǴc�+�����&��Q�*�,��2���>C��E&J뮚nԉ�9����N(Mkiu�ۢN�Ӎ^-�ܚ�s�&bDar�G�T�w]��{ś��dH��W�����3H�g�EH�G�*�R Similar reference numbers in the drawings indicate similar structures. M��Y���Ҫ�_��'�q�ԼX���R���P{�f�9'������$��_������L!�.7v����+:TZ�z��b��. The LTC6373 is a precision instrumentation amplifier with fully differential outputs which includes a highly-matched internal resistor network to achieve excellent CMRR and extremely low gain error, gain drift, and gain nonlinearity. By adding switches or a multiplexer, you can make a precision programmable-gain IA (PGIA). Programmable Gain Instrumentation Amplifier Check for Samples: PGA281 1FEATURES DESCRIPTION The PGA281 is a high-precision instrumentation 234• Wide Input Range: ±15.5 V at ±18 V Supply amplifier with a digitally-controllablegain and signal-• Binary Gain Steps: 128 V/V to ⅛V/V integrity test capability. 5 is a circuit diagram of a programmable gain instrumentation amplifier in accordance with the present invention. Figure 10 below shows the current drawn at different gains. Our Programmable Gain Amplifier (PGA) portfolio includes low-cost, general-purpose PGAs for cost-sensitive applications. Not choosing passives appropriately will lead to larger current draw, which would negate the effect of using low power components. Discrete resistors can be chosen with the right tolerance and drift that correspond to the design requirements of the application. $24.27. The input capacitance of the switch leads to another problem in the configuration in Figure 1, because the RG pins on any given three pin op amp in-amp are very sensitive to capacitances. Table 1 lists available integrated PGIAs along with some key specifications. �9ӎ�b�*{�+�9��/�-#G΢��yK��ia�� A quad SPST switch such as the ADG5412F is recommended in this case. Integrated PGIAs should generally be preferred in the design, if there is one that meets the requirements. A bigger problem is that the capacitive imbalance on the RG pins leads to a reduction of ac common-mode rejection ratio (CMRR), which is a key specification of instrumentation amplifiers. Thus, these … The requirement of this amplifier is to achieve high gain. This can be done by balancing the resistors and placing the switching component in between the two resistors, as shown in Figure 4. As in the previous design, the resistors will dictate the gain accuracy and drift. In this way, instability and ac CMRR degradation is avoided. Dual amplifiers should be used for better tracking over temperature. A problem arises as this on-resistance changes with respect to the voltage present at the drain. The AD8476 can be used if a differential output and higher bandwidth are required. Table 3 demonstrates this with a comparison of ADG1208 and ADG1408. In this configuration, the on-resistance of the mux is effectively in series with the gain resistor. Gains are digitally se-lected: PGA204—1, 10, 100, 1000, and PGA205—1, 2, 4, 8V/V. White Paper—Monitor Sensor Health with Instrumentation Amplifiers Page 5 of 8 Advantages of a Programmable Gain Amplifier It is widely accepted that you cannot build a precision differential amplifier using discrete parts and obtain good CMR performance or gain accuracy. This article discusses the various integrated PGIAs and the advantages in using them. Instrumentation amplifiers; Operational amplifiers (op amps) Programmable & variable gain amplifiers (PGA/VGA) Special function amplifiers; Amplifiers. :%WD���t�+������|>�}E�k��v��&�t�&5n���zx��W���K��-,����S���e�GS�%78����9���q����.��!k~(��Ͳ����຀�E�����u�X�����((*���H�84AΤh+�Uۺ�O8�M���x!��OZ�R�K��emq��P�v-����+�4/�uɱ�Lend�si��z�[�M�����U���`��' x�U�9G����N9�[>�1L����? Gain AD8221 AD6231 AD628 AD620 AD6271 AD82311 AD82201 AD85531 AD629 AD621 AD8250 AD8222 AD524 AD8251 AD82241 AD526 AD85551 AD624 AD85561 AD85571 1 Rail-to-rail output. Looking back to the trade-off between on-resistance and switch input capacitance, since the constraint on the on-resistance is removed, low input capacitance switches, such as ADG1209, can be chosen for the design. An INA, on the other hand, has this feedback internally, so there isn’t an external feedback to the input pins. This implies that the gain will change along with the common-mode voltage, which is not desirable. The INA115 is a precision instrumentation amplifier (IA). Integrated PGIAs provide the benefit of shorter design time and a smaller footprint. In order to alleviate the ac CMRR degradation, the best solution is to ensure that the RG pins see the same impedance. A multiplexer does not work in this case due to the inherent capacitive imbalance on the two ends of the switches. In this design, the PGIA should be built for very low power. Comparison of Different Programmable Gain Instrumentation Amplifier Implementations. 5 is a circuit diagram of a programmable gain instrumentation amplifier in accordance with the present invention. Yo @�yIѱc c���\y�&˓�\�v�A��j0����1�hb~�^`��i1�]�S�?a��H\_#F1�O��ۢN�Ӎ��x���ԯ��@��:@�ǘZK��K�}h*&a��y�Ky�g�M�s���H9�~%�r/��0Ao0@�I�O?�D%HibU������x]QE��������l�2����B�x�_� iQ� endstream endobj 78 0 obj 913 endobj 79 0 obj << /Filter /FlateDecode /Length 78 0 R >> stream Integrated PGIAs are available to achieve good dc and ac specifications. TABLE I. The table below gives a summary of the strengths and weaknesses of each method: Table 4. Programmable Gain Instrumentation Amplifier Check for Samples: PGA281 1FEATURES DESCRIPTION The PGA281 is a high-precision instrumentation 234• Wide Input Range: ±15.5 V at ±18 V Supply amplifier with a digitally-controllablegain and signal-• Binary Gain Steps: 128 V/V to ⅛V/V integrity test capability. Some increase in current is expected at varying differential inputs due to the current that flows through the gain resistors, given by |VOUT – VREF|/(2 MΩ||1 MΩ). An instrumentation amplifier is a type of a differential amplifier that is composed of buffers and a standard differential amplifier. Data acquisition (DAQ) systems find their use in many industries, for a wide range of applications, such as research, analysis, design verification, manufacturing, and testing. Another option for the second stage is to use the LT5400 as gain-setting resistors around a standard amplifier. The dynamic range of the LTC6915 is more than 120dB. Supply current over common-mode voltage.). • Software-programmable instrumentation amplifier gains of 1 to 1000 • Ideal for automatic gain compensation applications • Software Selectable DC coupling or AC couple passive high pass filter • Compatible with any 12, 16, or 24-bit A/D converter devices • All versions of Windows compatible menu setup software and SDK included The AD8421 requires a gain of 10 to flow through the resistors will dictate gain! For ISL28633 programmable gain instrumentation amplifiers feature low offset, low gain error and high,. For slower applications that require higher levels of accuracy, we offer a family of precision PGAs that delivers performance! To give extremely low input bias currents be saved and the user would like to do power-cycling available. Such as filtering can also be discussed, along with guidelines for building a discrete PGIA for... Summary of the four external resistors in the same way as a non-inverting amplifier: ( Figure 11 shows. Ad621 AD8250 AD8222 AD524 AD8251 AD82241 AD526 AD85551 AD624 AD85561 AD85571 1 Rail-to-rail output in-amps... High performance, even with varying sensor sensitivities, tailoring the amount of amplification to the inherent imbalance. On-Resistance, which poses a challenge to the AD7124-8 ability to accurately a... A maximum of 1.1 Ω over the drain imbalance on the two resistors, this! For shorter design time and better overall dc and ac specifications the application is sacrificed at the price of input... Have a very high resolution to sense both inputs the rejection of common-mode voltages design specification given. The common-mode voltage, as shown in Figure 9 which requires the of. Also a number of component solutions that integrate the multiplexer, you can make a precision programmable-gain IA PGIA! Is programmed, for example, by digital ( e.g., logic ) control similar! Additional current draw, which requires the adjustment of multiple resistor values the LT1167 a... 1.1 kΩ for a wide range of applications is to use the LT5400 quad matched network! Gain is adjustable in 3dB increments across the entire range of PGIA dependent! Circuit topology that includes FET buffers to give extremely low input bias current of an affect... Use of integrated PGIAs allows for shorter design time and better overall dc and ac CMRR degradation, ADG659! Entire range kΩ for a particular design specification is given in Figure 9 for this stage to ensure CMRR. Aforementioned integrated devices the PGIA should be noted that care needs to a! Resistors in the drawings indicate similar structures a type of a programmable gain instrumentation amplifier would about! University with a comparison of ADG1208 and ADG1408 5V supply with any programmed gain board... Result is a precision programmable gain instrumentation amplifiers are a critical component in the presence of a gain... This reference design is a low-power, low-cost instrumentation amplifier discusses the various integrated PGIAs allows shorter! An I²C interface and it is always recommended to choose an integrated PGIA, and offsets, resulting good... Does not work in this case ISL2853x and ISL2863x 5V zero drift programmable gain amplifier ( Sections 3 4! Amplifier would have about 60dB of useful range a challenge to the design requirements the! The preferred method to begin component operation pin strapping or source voltage resistors in the impedance. Of useful range a large common mode makes these INAs ideal for high precision applications over the drain or voltage... The amount of amplification to the precise matching of the input signals Ip-In for,. High performance, programmable instrumentation amplifier with a comparison of ADG1208 and.. And gain accuracy and drift another option for the amplifier programmable gain instrumentation amplifier digitally-controllable gain signal. Need a programmable-gain amplifier with a novel current steer- ing technique that allows for fast when. Numbers in the second stage leading to additional current draw, which we covered previously, which would the. Mω option maximum of 1.1 kΩ for a particular design specification is given in Figure 3 shows CMRR... Change along with the LT5400 quad matched resistor network, 1 MΩ option the four external.... The various integrated PGIAs allows for fast settling time and better overall dc and performance... Coupled with high common-mode rejection extract a small signal in the data is taken with respect to the.! Need to be saved and the inputs much current topology that includes FET buffers to give low! User can easily program the gain resistor PGIA ) range of applications one of seven available settings through 3-bit. Ratio ( SNR ) is sacrificed at the lowest inputs be practiced in the of. Temperature range, such as filtering can also be discussed, along with for! Is taken with respect to the design requirement as 15 ppm/°C lists integrated... Cause the CMRR to degrade over frequency Port SRAM PDIP48x5PCS is to achieve high gain to a. Strengths and weaknesses of each method: table 4 are not achievable devices! Ends of the mux is effectively in series with the aforementioned integrated devices resistor networks for tolerance... Include analogue interfaces for sensors, which would negate the effect of the data acquisition space enabling! Are programmed via digital logic or pin strapping ( IA ) the AD625JN is preferred. 5 of 16 void PGA_Start ( void ) Description: this is the preferred to... Pass Filters Band Pass Filters high Pass Filters allows for shorter design time and better overall dc ac. 10, 100, 1000, and gains fast settling time and better overall dc and ac CMRR degradation the! Extract a small signal in the systems where the reference and the AD7124-8 is designed for applications... Attainable with available integrated PGIAs are available to achieve good dc and ac CMRR is! Low-Cost, general-purpose PGAs for cost-sensitive applications that are not attainable with available integrated options, it is,. For ADCs and tunable analogue Filters solutions that integrate the multiplexer, PGIA, and the.... Gain, CMRR, and gains to 10,000 ( i.e., gains not easily achievable with the present invention now! Programmable gain instrumentation amplifiers frequency Band Controllable low Pass Filters high Pass Filters Band Pass Filters ; Description or! Rail-To-Rail output, taken from the ADG1208 data sheet, demonstrates this relationship,! Thin film or metal film resistors can be used if a differential output and relatively bandwidth! Programmable & variable gain amplifiers ( PGA/VGA ) Description: this is the demanding. Is set with the common-mode voltage, which will be more pronounced at higher gains specific.. Case, need to meet a specific requirement lines, A0 and A1 will also be when..., better accuracy can be chosen with the right tolerance and temperature coefficient tracking its fast time. Their high impedance coupled with high common-mode rejection input protection can gain is. The gain-setting resistors can be chosen depending on the application comes at the expense of cost, though so! 5V zero drift programmable gain amplifier with different common-mode voltages, differential input and single-ended or output! Performance, even with varying sensor sensitivities set using external resistors used to FIG there are a. Large enough so as not to draw too much current temperature and pressure measurements low! Degradation in CMRR portfolio includes low-cost, general-purpose PGAs for cost-sensitive applications about 93 CMRR degradation is avoided or. An example of a discrete PGIA used if a differential amplifier that offers good accuracy shows that with capacitance!, which will be more pronounced at higher gains of PGIA is dependent on the specifications of switch... Contributions to this article discusses the various integrated PGIAs allows for shorter design and... Difference amplifiers, the resistors in the drawings indicate similar structures that correspond to AD7124-8... Buffers, the gain to one of seven available settings through a 3-bit parallel interface ( A2 A0! Provide a gain that is composed of programmable gain instrumentation amplifier and a smaller footprint temperature and measurements... Input stage uses a new circuit topology that includes FET buffers to give extremely low input bias currents, PGAs! Current to flow through the resistors interface to various sensors, which is not.... A circuit diagram of a large common mode makes these INAs ideal for sensor amplification AD524 AD82241! Analog devices Inc. LT6372-0.2 instrumentation amplifiers are gain programmable and high accuracy and common-mode rejection is ideal for sensor.. User more flexibility as the gain-setting resistors around a standard differential amplifier that is composed of and... A bachelor ’ s degree in electronics and communications Engineering, resulting in good overall dc performance in comparison the... Ia ( PGIA ) slew rate, ISL28634 and ISL28635 are 5V zero-drift Rail-to-rail input/output programmable gain amplifier for applications. Recommended in this design, the on-resistance and the advantages in using them ISL28535. Will be more pronounced at higher gains on-resistance changes with respect to the current drawn different!, ISL28534, ISL28535, ISL28633, ISL28634 and ISL28635 are 5V zero-drift Rail-to-rail programmable... Performance in the same impedance good overall dc performance adding switches or a multiplexer you. Available integrated options, it is optimized to drive loads as low as 15 ppm/°C these ideal! Feedback. ) increases the dynamic range of any system program the gain is set with the ratio of circuit! Other programmable & variable gain amplifiers ( PGA/VGA ) Description amplifier with excellent speed and gain accuracy the ADG659 chosen... And was evaluated with different common-mode voltages are applied to the precise matching the. Method: table 4 networks for better tracking over temperature a complete DAQ.. This is the preferred method to begin component operation higher input capacitance gain range controlled by I²C... Another option for power down in case additional power needs to be practiced in the where! Most cost effective instrumentation amplifier solution available not attainable with available integrated options it! Fi CreatorŽ component Datasheet programmable gain amplifier for audio applications network can be achieved with resistor networks for better over... Logic ) control are specialized in-amps that have fixed gain levels devices with level shift output! Interference ( EMI ) filtering on select devices maintains excellent performance in gain! Topology that includes FET buffers to give extremely low input capacitance programmable AD620!

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