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15633 Datasheet(PDF) 8 Page - Linear Technology |
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15633 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  8 LTC1563-2/LTC1563-3 156323fa LP (Pin 1): Low Power. The LTC1563-X has two operating modes: Low Power and High Speed. Most applications will use the High Speed operating mode. Some lower fre- quency, lower gain applications can take advantage of the Low Power mode. When placed in the Low Power mode, the supply current is nearly an order of magnitude lower than the High Speed mode. Refer to the Applications Information section for more information on the Low Power mode. The LTC1563-X is in the High Speed mode when the LP input is at a logic high level or is open-circuited. A small pull-up current source at the LP input defaults the LTC1563-X to the High Speed mode if the pin is left open. The part is in the Low Power mode when the pin is pulled to a logic low level or connected to V –. SA, SB (Pins 2, 11): Summing Pins. These pins are a summing point for signals fed forward and backward. Capacitance on the SA or SB pin will cause excess peaking of the frequency response near the cutoff frequency. The three external resistors for each section should be located as close as possible to the summing pin to minimize this effect. Refer to the Applications Information section for more details. NC (Pins 3, 5, 10, 12, 14): These pins are not connected internally. For best performance, they should be con- nected to ground. INVA, INVB (Pins 4, 13): Inverting Input. Each of the INV pins is an inverting input of an op amp. Note that the INV pins are high impedance, sensitive nodes of the filter and very susceptible to coupling of unintended signals. Capacitance on the INV nodes will also affect the fre- quency response of the filter sections. For these reasons, printed circuit connections to the INV pins must be kept as short as possible. PIN FUNCTIONS LPA, LPB (Pins 6, 15): Lowpass Output. These pins are the rail-to-rail outputs of an op amp. Each output is designed to drive a nominal net load of 5k Ω and 20pF. Refer to the Applications Information section for more details on output loading effects. AGND (Pin 7): Analog Ground. The AGND pin is the midpoint of an internal resistive voltage divider developing a potential halfway between the V+ and V– pins. The equivalent series resistance is nominally 10k Ω.Thisserves as an internal ground reference. Filter performance will reflect the quality of the analog signal ground. An analog ground plane surrounding the package is recommended. The analog ground plane should be connected to any digital ground at a single point. Figures 1 and 2 show the proper connections for dual and single supply operation. V–, V+ (Pins 8, 16): The V– and V+ pins should be bypassed with 0.1 µF capacitors to an adequate analog ground or ground plane. These capacitors should be connected as closely as possible to the supply pins. Low noise linear supplies are recommended. Switching sup- plies are not recommended as they will decrease the filter’s dynamic range. Refer to Figures 1 and 2 for the proper connections for dual and single supply operation. EN (Pin 9): ENABLE. When the EN input goes high or is open-circuited, the LTC1563-X enters a shutdown state and only junction leakage currents flow. The AGND pin, the LPA output and the LPB output assume high impedance states. If an input signal is applied to a complete filter circuit while the LTC1563-X is in shutdown, some signal will normally flow to the output through passive compo- nents around the inactive part. A small internal pull-up current source at the EN input defaults the LTC1563 to the shutdown state if the EN pin is left floating. Therefore, the user must connect the EN pin to V– (or a logic low) to enable the part for normal operation. |
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