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LT1223CN8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1223CN8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LT1223 S APPLICATI I FOR ATIO inverting input (A1) senses the shield and the non-invert- ing input (A2) senses the center conductor. Since this amplifier does not load the cable (take care to minimize stray capacitance) and it rejects common mode hum and noise, several amplifiers can sense the signal with only one termination at the end of the cable. The design equations are simple. Just select the gain you need (it should be two or more) and the value of the feedback resistor (typically 1k) and calculate RG1 and RG2. The gain can be tweaked with RG2 and the CMRR with RG1 if needed. The bandwidth of the noninverting input signal is not reduced by the presence of the other amplifier, however, the inverting input signal bandwidth is reduced since it passes two amplifiers. The CMRR is good at high frequen- cies because the bandwidth of the amplifiers are about the same even though they do not necessarily operate at the same gain. Summing Amplifier (DC Accurate) The summing amplifier is easily made by adding additional inputs to the basic inverting amplifier configuration. The LT1223 has no IOS spec because there is no correlation between the two input bias currents. Therefore, we will not improve the DC accuracy of the inverting amplifier by putting in the extra resistor in the noninverting input. V = –R LT1223 • TA07 + – In V OUT V LT1223 + I1 V I2 V 1 R 2 R n R V V V I1 I2 In G1 G2 Gn ( ) OUT F • • • R R R + G G G R F Difference Amplifier The LT1223 difference amplifier delivers excellent performance if the source impedance is very low. This is because the common mode input resistance is only equal to RF + RG. RG1 1k LT1223 • TA09 OUT V A1 LT1223 IN V A2 LT1223 IN V –+ ++ –– RF1 1k RG2 1k RF2 1k VOUT = G (VIN + – V IN –) RF1 = RF2; RG1 = (G – 1) RF2; RG2 = TRIM GAIN (G) WITH RG2; TRIM CMRR WITH RG1 RF2 G – 1 (RF –50) LT1223 • TA08 + – OUT V LT1223 RF 100 V1 V2 OPTIONAL TRIM FOR CMRR RG RG (V – V ) 1 RF 2 RG VOUT = Video Instrumentation Amplifier This instrumentation amplifier uses two LT1223s to in- crease the input resistance to well over 1M. This makes an excellent “loop through” or cable sensing amplifier if the Cable Driver The cable driver circuit is shown on the front page. When driving a cable it is important to properly terminate both ends if even modest high frequency performance is required. The additional advantage of this is that it isolates the capacitive load of the cable from the amplifier so it can operate at maximum bandwidth. |
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