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LTC1562 数据表(PDF) 6 Page - Linear Technology |
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LTC1562 数据表(HTML) 6 Page - Linear Technology |
6 / 28 page 6 LTC1562 PIN FUNCTIONS INV A, INV B, INV C, INV D: Each of the INV pins is a virtual- ground summing point for the corresponding 2nd order section. For each section, external components ZIN, R2, RQ connect to the INV pin as shown in Figure 3 and described further in the Applications Information. Note that the INV pins are sensitive internal nodes of the filter and will readily receive any unintended signals that are capacitively coupled into them. Capacitance to the INV nodes will also affect the frequency response of the filter sections. For these reasons, printed circuit connections to the INV pins must be kept as short as possible, less than one inch (2.5cm) total and surrounded by a ground plane. V1 A, V1 B, V1 C, V1 D: Output Pins. Provide a bandpass, highpass or other response depending on external cir- cuitry (see Applications Information section). Each V1 pin also connects to the RQ resistor of the corresponding 2nd order filter section (see Figure 3 and Applications Informa- tion). Each output is designed to drive a nominal net load of 5k Ω and 30pF, which includes the loading due to the external RQ. Distortion performance improves when the outputs are loaded as lightly as possible. Some earlier literature refers to these outputs as “BP” rather than V1. V2 A, V2 B, V2 C, V2 D: Output Pins. Provide a lowpass, bandpass or other response depending on external cir- cuitry (see Applications Information section). Each V2 pin also connects to the R2 resistor of the corresponding 2nd order filter section (see Figure 3 and Applications Informa- tion). Each output is designed to drive a nominal net load of 5k Ω and 30pF, which includes the loading due to the external R2. Distortion performance improves when the outputs are loaded as lightly as possible. Some earlier literature refers to these outputs as “LP” rather than V2. BLOCK DIAGRA Overall Block Diagram Showing Four 3-Terminal 2nd Order Sections V+ V– SHDN 1562 BD 2ND ORDER SECTIONS R R INV V1 V2 C SHUTDOWN SWITCH SHUTDOWN SWITCH AGND V+ V– INV V1 V2 INV V1 V2 INV V1 V2 C CC AB DC – + – + ∫∫ ∫∫ |
类似零件编号 - LTC1562 |
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类似说明 - LTC1562 |
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