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LT1568 Datasheet(PDF) 8 Page - Linear Technology |
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LT1568 Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page LT1568 8 1568f PI FU CTIO S V+ (Pins 1, 16): The V+ positive supply voltage pins should be tied together and bypassed with a 0.1 µF capacitor to an adequate analog ground plane using the shortest possible wiring. INVA, INVB (Pins 2, 15): Inverting Input. Each of the INV pins is an inverting input of an op amp. Note that the INV pins are high impedance, and are susceptible to coupling of unintended signals. External parasitic capacitance on the INV nodes will also affect the frequency response of the filter sections. For these reasons, printed circuit con- nections to the INV pins must be kept as short as possible. SA, SB (Pins 3, 14): Summing Pins. These pins are a summing junction for input signals. Stray capacitance on the SA or SB pins may cause “small” frequency errors of the frequency response near the cutoff frequency (or center frequency). The three external resistors for each section should be located as close as possible to the SA or SB pin to minimize stray capacitance (one picofarad of stray capacitance may add up to 0.1% frequency error). OUTA, OUTB (Pins 4, 13): Lowpass Output. These pins are the rail-to-rail outputs of op amps. Each output is designed to drive a nominal net load of 400 Ω and 30pF. OUTA, OUTB (Pins 5, 12): These pins are the inverted versions of the OUTA and OUTB outputs respectively. Each output is designed to drive a nominal load of 400 Ω and 30pF. GNDA (Pin 6): GNDA serves as the common mode refer- ence voltage for section A. It should be tied to the analog ground plane in a dual supply system. In a single-supply system, an internal resistor divider can be used to estab- lish a half-supply reference point. In that case, GNDA must be bypassed to V– (Pins 8, 9) by a 0.1 µF capacitor. NC (Pin 7): This pin is not connected internally and can be connected to ground. V– (Pins 8, 9): The V– negative supply voltage pins should be tied together and bypassed to GND by a 0.1 µF capacitor in a dual-supply system. In a single-supply system, tie these pins to the ground plane. EN (Pin 10): ENABLE. When the EN input goes high or is open circuited, the LT1568 enters a shutdown state which reduces the supply current to approximately 0.5mA (VS = 5V). The OUTA, OUTB, OUTA and OUTB pins assume high impedance states. GNDA will continue to be biased at half-supply. If an input signal is applied to a complete filter circuit while the LT1568 is in shutdown, some signal will normally flow to the output through passive components around the inactive IC. EN is connected to V+ through an internal pull-up resistor of approximately 40k. This defaults the LT1568 to the shutdown state if the EN pin is left floating. Therefore, the user must connect the EN pin to a voltage equal to or less than (V+ – 2.1)V to enable the part for normal operation. (For example, if V+ is 5V, then to enable the part the EN pin voltage should be 2.9V or less.) GNDB (Pin 11): GNDB serves as the common mode reference voltage for section B. It should be tied to the analog ground plane in a dual supply system. In a single- supply system, GNDB can be tied to GNDA to set the common mode voltage at half-supply. If it is tied to another reference voltage, GNDB should be bypassed to V– (Pins 8, 9) by a 0.1 µF capacitor. |
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