Electronic Components Datasheet Search |
|
AMP02FP Datasheet(PDF) 9 Page - Analog Devices |
|
AMP02FP Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page REV. E AMP02 –9– 25k V2 R 25k 25k V1 R 25k RG RG2 RG1 +IN –IN 25k 25k SENSE (SOIC-16 ONLY) OUT REFERENCE 3 8 1 2 5 6 Figure 4. Triple Op Amp Topology Grounding The majority of instruments and data acquisition systems have separate grounds for analog and digital signals. Analog ground may also be divided into two or more grounds that will be tied together at one point, usually at the analog power supply ground. In addition, the digital and analog grounds may be joined—normally at the analog ground pin on the A/D converter. Following this basic practice is essential for good circuit performance. Mixing grounds causes interactions between digital circuits and the analog signals. Since the ground returns have finite resistance and inductance, hundreds of millivolts can be developed between the system ground and the data acquisition components. Using separate ground returns minimizes the current flow in the sensitive analog return path to the system ground point. Consequently, noisy ground currents from logic gates interact with the analog signals. Inevitably, two or more circuits will be joined together with their grounds at differential potentials. In these situations, the differential input of an instrumentation amplifier, with its high CMR, can accurately transfer analog information from one circuit to another. Sense and Reference Terminals The sense terminal completes the feedback path for the instrumen- tation amplifier output stage and is internally connected directly to the output. For SOIC devices, connect the sense terminal to the output. The output signal is specified with respect to the refer- ence terminal, which is normally connected to analog ground. The reference may also be used for offset correction level shift- ing. A reference source resistance will reduce the common-mode rejection by the ratio of 25 k Ω/R REF. If the reference source resis- tance is 1 Ω, the CMR will be reduced 88 dB (25 kΩ/1 Ω = 88 dB). Figure 4 shows the triple op amp configuration of the AMP02. With all instrumentation amplifiers of this type, it is critical not to exceed the dynamic range of the input amplifiers. The ampli- fied differential input signal and the input common-mode volt- age must not force the amplifier’s output voltage beyond ±12 V (VS = ±15 V) or nonlinear operation will result. The input stage amplifier’s output voltages at V1 and V2 equal: V R R V V G V V V R R V V G V V G D CM D CM G D CM D CM 1 2 1 2 2 2 1 2 2 2 =+ + =+ =+ + =+ – – where: VD = Differential input voltage = (+IN) – (–IN) VCM = Common-mode input voltage G = Gain of instrumentation amplifier If V1 and V2 can equal ±12 V maximum, the common-mode input voltage range is: CMVR V GV D =± − 12 2 |
Similar Part No. - AMP02FP |
|
Similar Description - AMP02FP |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |