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LT1568IGN Datasheet(PDF) 10 Page - Linear Technology |
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LT1568IGN Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LT1568 10 1568f APPLICATIO S I FOR ATIO The LT1568 has been designed to make the implementa- tion of high frequency filtering functions very easy. Inter- nal low noise amplifiers and capacitors are configured in a topology that requires only three external resistors to implement a 2nd order filter stage. The two 2nd order stages can be used independently or cascaded for simple 4th order filter functions. With two stages integrated on the same die, the matching of the independent sections is better than what can be achieved with separate amplifier components. OPERATING WITH SINGLE OR DUAL SUPPLIES Figure 1 shows the recommended connection of an analog ground plane with the LT1568 biased from either symmetri- cal dual ( ±V) power supplies or a single supply. Connec- tion of the two GND pins is important to properly DC bias the internal amplifiers. The use of a ground plane helps to minimize noise and stray components to preserve signal integrity and maintain frequency response accuracy. When biasing from a dual supply, it is recommended that a Schottky diode clamp (BAT54S) be added as shown. These diodes ensure that improper supply voltages, through either reverse polarity or power-up sequencing, do not damage the LT1568. SIMPLE FILTER IMPLEMENTATIONS The basic 2nd order filter block of the LT1568, with three external resistors connected as shown in the Block Dia- gram, has the following lowpass transfer function: e e DC f s f Q sf OUT IN GAIN O O O = π () + π +π () – •2 2 2 2 2 2 where eOUT is either OUTA or OUTB, DC R R f RR C C GAIN O == π 2 1 1 22 3 1 2 , •• • and Q CC R R R f CR R R R R C R R O = π + ()+ [] 21 2 1 2 3 11 2 3 2 3 2 1 2 • • • ••• •• • – • • The typical values of the internal capacitors are: C1= 105.7pF C2 = 141.3pF These filter functions assume ideal amplifiers. Dual Supply Power and Ground Connections Single Supply Power and Ground Connections 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V+ INVA SA OUTA OUTA GNDA NC V– V+ INVB SB OUTB OUTB GNDB EN V– LT1568 BAT54S V+ V– 0.1 µF 0.1 µF SINGLE POINT SYSTEM GROUND 1568 F01a ANALOG GROUND PLANE DIGITAL GROUND PLANE (IF ANY) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V+ INVA SA OUTA OUTA GNDA NC V– V+ INVB SB OUTB OUTB GNDB EN V– LT1568 V+ 0.1 µF 0.1 µF SINGLE POINT SYSTEM GROUND 1568 F01b ANALOG GROUND PLANE DIGITAL GROUND PLANE (IF ANY) Figure 1. Dual and Single Supply and Ground Plane Connections |
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