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LTC6605CDJC-7-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC6605CDJC-7-PBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTC6605-7 10 66057f Functional Description The LTC6605-7 is designed to make the implementation of high frequency fully differential filtering functions very easy. Two very low noise amplifiers are surrounded by precision matched resistors and precision matched capaci- tors enabling various filter functions to be implemented by hard wiring pins. The amplifiers are wide band, low noise and low distortion fully differential amplifiers with accurate output phase balancing. They are optimized for driving low voltage, single-supply, differential input analog-to- digital converters (ADCs). The LTC6605-7 operates with a supply voltage as low as 2.7V and accepts inputs up to 325mV below the V– power rail, which makes it ideal for converting ground referenced, single-ended signals into differential signals that are referenced to the user-supplied common mode voltage. This is ideal for driving low volt- age, single-supply, differential input ADCs. The balanced differential nature of the amplifier and matched surround- ing components provide even-order harmonic distortion cancellation, and low susceptibility to common mode noise (like power supply noise). The LTC6605-7 can be operated with a single-ended input and differential output, or with a differential input and differential output. The outputs of the LTC6605-7 can swing rail-to-rail. They can source or sink a transient 70mA of current. Load capacitances should be decoupled with at least 25Ω of series resistance from each output. Filter Frequency Response and Gain Adjustment Figure 3 shows the filter architecture. The Laplace transfer function can be expressed in the form of the following generalized equation for a 2nd order lowpass filter: VOUT(DIFF) VIN(DIFF) = GAIN 1+ s 2πfO •Q + s2 2πfO () 2 , with GAIN, fO and Q as given in Figure 3. Note that GAIN and Q of the filter are based on component ratios, which both match and track extremely well over temperature. The corner frequency fO of the filter is a function of an RC product. This RC product is trimmed to ±1% and is not expected to drift by more than ±1% from nominal over the entire temperature range –40°C to 85°C. As a result, fully differential filters with tight magnitude, phase tolerance and repeatability are achieved. Various values for resistors R1 and R4 can be formed by pin-strapping the internal 100Ω and 400Ω resis- tors, and optionally by including one or more external resistors. Note that non-zero source resistance should be combined with, and included in, R1. Figure 3. Filter Architecture and Equations APPLICATIONS INFORMATION – + + – VOUT(DIFF) 66057 F03 VIN(DIFF) R2 400Ω R3 125Ω R3 125Ω R2 400Ω R4 = R4A + R4B + REXT R1 R1 REXT R4A R4B C1 69.3pF C1 69.3pF C2 114.8pF C2 114.8pF + – – + |
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